WO2014073911A1 - Device and method for controlling operation and dimming of ac led - Google Patents

Device and method for controlling operation and dimming of ac led Download PDF

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Publication number
WO2014073911A1
WO2014073911A1 PCT/KR2013/010144 KR2013010144W WO2014073911A1 WO 2014073911 A1 WO2014073911 A1 WO 2014073911A1 KR 2013010144 W KR2013010144 W KR 2013010144W WO 2014073911 A1 WO2014073911 A1 WO 2014073911A1
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Prior art keywords
dimming
led
driving
signal
input voltage
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PCT/KR2013/010144
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French (fr)
Korean (ko)
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정혜만
강현구
한상욱
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서울반도체 주식회사
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Publication of WO2014073911A1 publication Critical patent/WO2014073911A1/en

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/32—Pulse-control circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/48—Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/32—Pulse-control circuits
    • H05B45/325—Pulse-width modulation [PWM]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/345—Current stabilisation; Maintaining constant current
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Definitions

  • the present invention relates to an AC light emitting diode driving and dimming control apparatus and a method thereof, and more particularly, to an AC light emitting diode driving and dimming which can control the light output of the AC light emitting diode light source based on the entire lighting of the LED. It relates to a control device and a method thereof.
  • Dimmer refers to a device for adjusting or changing the illuminance of a lamp, and a phase control dimmer using a triac switch or a field effect transistor (FET) switch is widely used.
  • FET field effect transistor
  • FIG. 1 An example of an alternating light emitting diode (LED) lighting system with a conventional phase controlled dimmer is shown in FIG. 1. 1 is shown in the form of adding a phase control dimmer to a conventional AC LED lighting system using an LED multiphase driving circuit of US Pat. No. 7,081,722.
  • LED alternating light emitting diode
  • a conventional AC LED lighting system includes a phase control dimmer 2 and an AC LED module 4, and the AC LED module 4 includes a rectifier and a plurality of LEDs.
  • a plurality of driving switches PS 1 , PS 2 ,... For driving the groups (Group 1, Group 2, ..., Group n) (n is an arbitrary natural number) and each LED group independently or sequentially. PS n ).
  • Each LED group has one or more light emitting diode elements, and when there are a plurality of light emitting diode elements, they are connected in series or in parallel with each other.
  • the phase of the input AC voltage V AC is adjusted through the dimmer 2 connected to the input of the rectifier in order to adjust the light output of the AC LED module 4 to a desired intensity.
  • Configured to control That is, in the AC LED lighting system, according to the height of the dimming level in the phase control dimmer 2, a part of the phase of the input periodic voltage is removed through the delay operation of the switching element in the dimmer 2, thereby The light output of the plurality of LED groups is controlled corresponding to the remaining phase section.
  • the AC LED illumination system has a delay operation in the dimmer in the periodic waveform of the input AC voltage from the phase control dimmer 2 operating in the forward or reverse phase control scheme (S OFF).
  • Step-by-step driving current for receiving the output voltage (corresponding to the S ON section) with the leading edge or the trailing edge removed, and following the waveform of the received output voltage (corresponding to the section).
  • the light output (LED light output) of the plurality of LED groups is controlled in accordance with the height of the dimming level in the dimmer 2.
  • any second LED group of the plurality of LED groups when any second LED group of the plurality of LED groups is turned on so that the LED current follows the waveform of the output voltage of the dimmer 2, it is turned on at the point immediately before it. Sequentially driving the plurality of LED groups in a manner to turn off the first LED group reduces power loss of the system.
  • the dimming control characteristic is better than a dimmer using a triac switch, but has a disadvantage in that the dimming range is narrow.
  • the AC LED lighting system there is a disadvantage that partial lighting occurs due to the waveform of the output voltage of the phase control dimmer.
  • the operation period of the AC LED is from the maximum value of the input period voltage to the zero potential of the period voltage, in the case of the forward phase control type dimmer from the maximum value point of the input period voltage
  • the LED groups start to turn off step by step, and therefore, in the AC LED module 4, there is a disadvantage that a specific LED group is turned off first so that a problem such as local dimming occurs. .
  • the LED group in the LED light source unit gradually increases from the zero potential point of the input periodic voltage to the maximum value of the voltage.
  • a specific LED group starts to light up first, and therefore, a specific LED group having at least one light emitting diode is frequently turned on first in the LED light source unit, which causes a problem such as a partial lighting phenomenon.
  • FIG. 4 The above-described partial lighting phenomenon of the prior art is shown in FIG. 4 according to an example of the height of the dimming level.
  • the four light emitting diodes D1, D2, D3, and D4 connected to each other in series may correspond to four LED groups among the plurality of LED groups of FIG. 1.
  • the first dimming level DL1 which is the lowest illuminance level among four illuminance levels, is set, and the dimmer 2 phases the input AC voltage according to the set first dimming level.
  • the driving control signal is applied to the first driving switch PS 1 among the plurality of driving switches connected in series with the cathodes of the respective light emitting diodes, the first light emitting diode ( Only D1) lights up.
  • the driving control signal is applied to the second driving switch PS 2 at the second dimming level DL2
  • the first light emitting diode D1 is first turned on in the first sub period SP1 of the periodic voltage. Subsequently, the first and second light emitting diodes D1 and D2 are turned on in the second sub period SP2.
  • the driving control signal is applied to the third driving switch (not shown) at the third dimming level DL3
  • the first light emitting diode D1 is turned on in the first sub-section SP1 of the periodic voltage waveform, and the first sub-LED is turned on.
  • the first and second light emitting diodes D1 and D2 are turned on in the second sub-section SP2 following the section, and the first to third light-emitting diodes D1 in the third sub-section SP3 following the second sub-section. , D2, D3) light up.
  • the driving control signal is applied to the fourth driving switch (not shown) at the fourth dimming level DL3, the first light emitting diode D1 is turned on in the first sub-section SP1 of the periodic voltage, and the first light emitting diode D1 is turned on.
  • the first and second light emitting diodes D1 and D2 are turned on in the second sub-section SP2 following the sub-section, and the first to third light emitting diodes (3) in the third sub-section SP3 following the second sub-section SP3.
  • D1, D2, and D3 are turned on, and the first to fourth light emitting diodes D1, D2, D3, and D4 are turned on in the fourth sub-section SP4 following the third sub-section.
  • the present invention is to solve the above problems, AC light emitting diode (LED) driving and dimming control apparatus and method according to the present invention, LED by controlling the light output of the LED light source unit on the basis of the overall lighting of the LED It aims at eliminating the partial lighting phenomenon in a light source part and improving lifetime.
  • LED AC light emitting diode
  • An AC LED driving and dimming control apparatus and method thereof by controlling the light output of the LED light source unit in a multiphase or sequential driving method based on the entire lighting of the light emitting diode in the LED light source unit Another aim is to eliminate partial lighting and improve system efficiency and lifespan.
  • an AC light emitting diode (LED) driving and dimming control device includes: an input voltage receiving unit receiving an input voltage whose voltage varies periodically with time; A signal for adjusting the length of a light emitting section, which is a time that an LED light source having a plurality of light emitting diode (LED) groups emits light according to a high level of dimming level, and is generated at a reference time point when an input voltage has a maximum value.
  • a dimming control unit for generating a dimming signal in which the width of the square wave signal is extended or reduced in accordance with the height of the dimming level by adjusting the positions of the rising edge and the falling edge of the square wave signal at both sides of the reference point.
  • LED emission control unit for controlling the driving and dimming of the LED light source unit to reduce the number of LED groups to emit light as the number of or increases the size of the input voltage is characterized in that it comprises a.
  • the dimming control unit the left and right edges of the square wave signal is adjusted to the left and right symmetrically relative to the reference point position
  • a dimming signal having an extended or reduced width of the square wave signal may be generated according to a high or low dimming level.
  • the dimming control unit is located on both sides of the reference point with respect to the reference point with respect to the position of the rising edge and the falling edge of the square wave signal. By adjusting it to be located at a different distance, it is characterized in that for generating a dimming signal, the width of the square wave signal is extended or reduced in accordance with the height of the dimming level.
  • the dimming control unit the zero point detection unit for detecting the zero point of the input voltage;
  • a phase detector configured to detect a reference time point at which the input voltage has a maximum value based on the zero point;
  • a dimming signal generating unit for generating a dimming signal extending by a predetermined width to both sides of the reference point of view based on the elevation of the dimming level of the rising edge and the falling edge of the square wave pulse.
  • the LED light emission control unit PWM (Pulse Width Modulation) controller for outputting a drive control signal for sequentially driving a plurality of LED groups based on the dimming signal Characterized in having a.
  • PWM Pulse Width Modulation
  • the AC LED driving and dimming control apparatus further includes a plurality of driving switches for controlling the current flowing through the plurality of LED groups, respectively.
  • each drive switch connected in series to each LED group is characterized in that the selective operation in response to the drive control signal.
  • the alternating current LED driving and dimming control apparatus further includes a protection circuit unit which detects a current flowing through the driving switch and provides it to the LED emission control unit. It is done.
  • the LED light emission control unit is characterized in that the constant current drive a plurality of LED groups based on the current detection signal from the protection circuit.
  • the AC LED driving and dimming control device further generates a dimming reference signal for adjusting the height of the dimming level and supplies the dimming interface to the dimming control unit. It is characterized by including.
  • the input voltage receiving unit is characterized by comprising a rectifying unit for rectifying the input AC power to output the input voltage.
  • An AC LED driving and dimming control method comprises: a first step of receiving an input voltage whose voltage varies periodically with time; Generating a square wave signal at a reference time point at which the input voltage has a maximum value; Generating a dimming signal in which the width of the square wave signal is extended or reduced in accordance with the height of the dimming level by adjusting the positions of the rising edge and the falling edge of the square wave signal at both sides of the reference time point; And controlling the driving and dimming of the ED light source by a driving voltage or a driving current according to a limited input voltage by applying a driving control signal to the LED light source having a plurality of LED groups based on the dimming signal. And the LED light source unit operates to increase the number of LED groups emitting light as the magnitude of the input voltage increases under the dimming level or to decrease the number of LED groups emitting light as the magnitude of the input voltage decreases. .
  • the third step the position of the leading edge (raising edge) and the trailing edge (falling edge) of the square wave signal symmetrically with respect to the reference point
  • the width of the square wave signal is extended or reduced in accordance with the height of the dimming level.
  • the third step the reference point both sides of the reference point with respect to the position of the rising edge and the falling edge of the square wave signal
  • the width of the square wave signal is extended or reduced in accordance with the height of the dimming level to generate a dimming signal.
  • the LED light source unit is driven by applying a PWM (Pulse Width Modulation) driving control signal for sequentially driving a plurality of LED groups. And controlling dimming.
  • PWM Pulse Width Modulation
  • the alternating current LED driving and dimming control method protects the driving switch driven on or off by a driving control signal and presets the driving current of the LED light source unit. Detecting current flowing through the drive switch to limit the range.
  • the AC LED driving and dimming control method further includes, before the third step, receiving a dimming reference signal indicating the height of the dimming level from the dimming interface. It is characterized by including.
  • the first step is characterized in that for receiving the input voltage by rectifying the external input AC power.
  • the AC light emitting diode (LED) driving and dimming control device and the method thereof according to the present invention control the light output of the AC LED light source unit based on the entire lighting of the light emitting diodes, so that the lighting device, the backlight unit, or the like is controlled. It provides the effect of eliminating partial lighting phenomenon in the AC LED light source used and improving the life of the AC LED light source and the lighting system.
  • the AC LED light source unit by controlling the light output of the AC LED light source unit in a multiphase or sequential driving method based on the entire lighting of the light emitting diodes Eliminates partial lighting in the system, increases the efficiency of the device, and improves the life of the AC LED light source and lighting system.
  • FIG. 1 is a schematic block diagram of an example of a light emitting diode (LED) lighting system with a conventional phase controlled dimmer.
  • LED light emitting diode
  • FIG. 2 is an operation timing diagram of the LED lighting system of FIG.
  • FIG. 3 is another operational timing diagram of the LED lighting system of FIG.
  • FIG. 4 is a view showing the light output of the LED light source according to the dimming level of the LED lighting system of FIG.
  • FIG. 5 is a block diagram of an AC LED driving and dimming control device according to an embodiment of the present invention.
  • FIG. 6 is a schematic block diagram of a dimming control unit of the AC LED driving and dimming control device of FIG.
  • FIG. 7 is a flow chart of the AC LED driving and dimming control method according to an embodiment of the present invention.
  • FIG. 8 to 12 are views illustrating the AC LED driving and dimming control method of FIG. 7 according to dimming levels.
  • FIG. 13 is a view showing an AC LED driving and dimming control method according to another embodiment of the present invention according to the dimming level.
  • FIG. 5 is a block diagram of an AC LED driving and dimming control device according to an embodiment of the present invention.
  • the AC LED driving and dimming control device 10 includes an input voltage receiving unit, a dimming control unit 12, an LED emission control unit 13, a switching unit 14, and a protection circuit unit 15. It is provided.
  • the input voltage receiver is a means or a component for receiving an input voltage Vin and an input current which are connected in series with an input AC power supply 6 supplied to an AC LED drive and a dimming control device.
  • the input voltage receiving unit includes a rectifying unit 16 for full-wave rectifying the input AC power supply 6 to output the input voltage Vin and the input current.
  • the rectifier 16 may be implemented as a bridge diode or the like.
  • the input voltage receiver may include an input terminal 11 to which an AC power source 6 is applied.
  • the input voltage receiver may include at least one protection circuit for removing noise on an input AC power source or an input power source rectifying the input AC power source, removing a surge voltage, and removing an electronic interference.
  • the dimming control unit 12 generates a dimming signal for adjusting the length of the light emitting section of the LED light source unit according to the high and low (high and low) of the dimming level, and outputs the generated dimming signal to the LED emission control unit 13.
  • the dimming control unit 12 according to the present exemplary embodiment generates a square wave signal at a reference time point at which the periodic voltage of the input voltage has a maximum value, and drives and modulates the LED light source unit 20 based on the generated square wave signal. By controlling, the light output of the LED light source unit 20 is controlled on the basis that the entire light emitting diode of the LED light source unit 20 is turned on.
  • the dimming control unit 12 is a square wave signal according to the height of the dimming level when the rising edge and the falling edge of the square wave signal respectively correspond to the dimming on time and dimming off time of the dimming level.
  • the dimming signal may be generated such that the width of the light is extended or reduced symmetrically from both sides of the reference time point with respect to the reference time point.
  • the dimming control unit 12 when the leading edge and the trailing edge of the square wave signal respectively correspond to the dimming lighting time and dimming off time of the dimming level, the width of the square wave signal based on the height of the dimming level is referred to As a result, dimming signals may be generated to extend or contract to different widths at both sides of the reference point.
  • the dimming control unit 12 at the dimming control of the LED light source unit 20 is the lowest level at the maximum value of the input voltage corresponding to the rated input voltage (driving voltage, etc.) of the LED light source unit 20 Since the dimming signal is generated, the light emission of the LED light source unit 20 is controlled based on the lighting of the entire LED of the LED light source unit 20 regardless of the height of the dimming level.
  • the above-described dimming signal may be, for example, a signal for designating a predetermined dimming level according to an input signal (dimming reference signal, etc.) at the dimming interface (see 17 in FIG. 3).
  • the input signal at the dimming interface may be an analog or digital signal and may also be a wired or wireless signal.
  • the dimming control unit 12 may include an analog-to-digital converter, a communication interface, and the like, but since the analog-to-digital converter or communication interface that performs such signal processing is well known, detailed description thereof will be omitted.
  • the dimming signal may be a signal including dimming data previously stored in a storage unit (not shown) such as a memory device mounted on the dimming controller 12 or the AC LED driving and dimming control device 10.
  • the dimming data may store a plurality of dimming levels for specifying different brightness of the lighting system and execution conditions (time, person detection, etc.) for each dimming level.
  • the dimming control unit 12 may read the dimming data stored in the storage unit according to a preset time, and generate a specific dimming signal according to the height of the dimming level included in the read dimming data.
  • the LED emission control unit 13 applies the driving control signal to the LED light source unit 20 in response to the dimming signal from the dimming control unit 12 to input the input voltage Vin supplied to the LED light source unit 20 according to the height of the dimming level. At least one of the driving voltage and the driving current according to the input voltage is limited, and the driving and dimming of the LED light source unit 20 having the plurality of LED groups are simultaneously controlled by this limitation.
  • the LED light emission control unit 13 may increase the number of LED groups emitting light as the size of the input voltage Vin increases or decrease the number of LED groups emitting light as the size of the input voltage Vin decreases.
  • the driving and dimming of the LED light source unit 20 is controlled.
  • the LED emission control unit 13 may include a PWM (Pulse Width Modulation) controller for outputting a driving control signal for sequentially driving the plurality of LED groups based on the dimming signal. Structures or methods for sequential driving of a plurality of LED groups are described in detail in US Pat. No. 7,081,722 and the like, and thus detailed descriptions thereof will be omitted.
  • the switching unit 14 includes a semiconductor switch that is turned on or off in response to application of a drive control signal from the LED emission control unit 13.
  • the semiconductor switch may be implemented with an n-channel MOSFET or the like.
  • the driving voltage and the driving current supplied to the LED light source unit 20 by the operation of the switching unit 14 may be limited according to the height of the dimming level.
  • the switching unit 14 according to the present embodiment includes a plurality of driving switches (PS 1 and PS 2 of FIG. 1) connected to the cathode side of each LED group to sequentially drive the plurality of LED groups of the LED light source unit 20. , PS n ).
  • the protection circuit unit 15 detects the current flowing through the LED light source unit 20 and the voltage across the resistor R1, and controls the LED current to be controlled based on the detected current value and the voltage value to uniformly emit light of the LED light source unit 20.
  • the light source unit 20 and the switching unit 14 are protected from abnormal current.
  • the resistor R1 is connected in series between the driving switch Q1 and neutral or ground.
  • the driving switch is formed of a metal oxide semiconductor field effect transistor (MOSFET)
  • the protection circuit unit 15 is commonly connected to the second terminal of the driving switch (for example, the source of the n-channel MOSFET) and one terminal of the resistor R1.
  • the LED current flowing through the driving switch Q1 may be detected, and the detected LED current value may be applied to the driving controller 124.
  • the protection circuit unit 15 may be implemented as a current sink for driving a constant current of the LED light source unit 20.
  • the protection circuit unit 15 uses an operational amplifier to supply a voltage between the second terminal of the drive switch and the ground (or neutral), that is, the voltage across the resistor R1, to a predetermined reference voltage (drive control signal, etc.). Constant current control of the LED current is equal to
  • the AC LED driving and dimming control device 10 may further include a control power supply unit 17 and the like.
  • the control power supply 17 is connected in series to the output terminal of the rectifier 16 to supply the internal power required for the AC LED drive and the dimming control device 10 or to generate a synchronization signal to control the dimming control unit 12 or the LED emission control unit 13. Can be implemented.
  • Such a control power supply 17 is already well known in the art, so a detailed description thereof will be omitted.
  • the LED light source unit 20 includes a plurality of light emitting diodes and a rated driving voltage corresponding to the input voltage.
  • the LED light source unit 20 may include a plurality of LED packages or LED strings connected in series or in parallel with each other.
  • the LED light source unit 20 may be referred to as an LED array.
  • FIG. 6 is a schematic block diagram of a dimming control unit of the AC LED driving and dimming control device of FIG. 5.
  • the dimming controller 12 includes a zero point detector 121, a phase detector 122, and a dimming signal generator 123.
  • the zero point detector 121 detects a zero point or zero potential of the input voltage Vin.
  • the zero crossing detector 121 detects a time point at which the input voltage is 0V.
  • the zero detection unit 121 is a means for detecting a phase (or a time point) at which a component value of an input voltage obtained by full-wave rectifying an AC input voltage having a sine wave form or performing a function corresponding thereto. Implemented as negative.
  • the phase detector 122 detects a reference time point that is a time point at which the input voltage exhibits a maximum value based on the zero point detection signal from the zero point detector 121.
  • the zero detection signal is a signal including phase or viewpoint information on the zero or zero potential of the input voltage.
  • the reference time point may be detected by calculating an intermediate time point between two adjacent zero points or two time points for the two zero points.
  • phase detector 122 determines a current pulse signal output from the AC LED driving and phase control apparatus.
  • the pulse signal (synchronization signal, etc.) may be generated by the control voltage supply unit 16 and supplied to the AC LED drive and phase control device.
  • the dimming signal generator 123 generates a square wave pulse based on the reference time point from the phase detector 122 and the dimming reference signal from the dimming interface 17.
  • the dimming signal generator 123 extends the rising edge and the falling edge of the square wave pulse to both sides of the reference point by a predetermined width based on the reference point having the maximum input voltage.
  • a dimming signal is generated, and the generated dimming signal is output to the LED emission controller.
  • the dimming signal generator 123 outputs a synchronous signal from an input voltage, outputs a clock signal of a predetermined period using the output synchronous signal, counts a clock signal, and counts binary data (count clock). Number) and control the operating frequency of the oscillator according to the count clock number.
  • the dimming signal generating unit 123 determines the enable period (corresponding to the light emitting period) of the square wave signal (corresponding to the dimming signal) using the count clock number, and controls the driving of the LED light emitting controller during the determined enable period. It can be implemented to output a signal.
  • the driving control signal may be applied to the control terminal of the driving switch of the switching unit 14 or the operational amplifier of the protection circuit unit 15.
  • the above-described dimming signal generator 123 may be implemented as the phase shift PWM controller 130 together with the LED emission controller (see 13 of FIG. 5).
  • AC LED driving and dimming control apparatus may have a dimming interface 18 depending on the implementation.
  • the dimming interface 18 corresponds to a user device (dimmer) for adjusting the illuminance of the LED light source unit 20 and may have an analog, digital, or a combination thereof in which an output value thereof changes according to a user input. have.
  • the dimming interface 18 may include a dimmer structure such as a dial method, a button method, and a touch method for controlling the light output of the LED light source unit 20.
  • the dimming interface 18 can be implemented using various existing structures, for example, a load including a resistor; Loads including resistors and capacitors; Loads including resistors and inductors; And a load including a resistor, a capacitor, and an inductor.
  • the dimming interface 18 may be installed to be exposed to the outside of the AC LED driving and dimming control device or may be installed as a separate device independent of the AC LED driving and dimming control device.
  • the dimming interface 18 may be implemented as a dimmer coupled to an LED module or LED lamp including the LED light source unit 20 and the AC LED driving and dimming control device.
  • the dimming interface 17 may be installed integrally with the LED lamp in the housing of the LED lamp or may be separately installed at various locations such as a building wall regardless of the type or structure of the LED lamp, depending on the implementation.
  • FIG. 7 is a flow chart of the AC LED driving and dimming control method according to an embodiment of the present invention.
  • the AC LED driving and dimming control method first receives an input voltage whose voltage varies periodically depending on time (S71).
  • the input voltage is preferably a voltage obtained by rectifying the input AC voltage.
  • a square wave pulse is generated at the reference time point at which the input voltage has the maximum value (S72).
  • Generating the square wave pulse at the reference time is preferably to generate the square wave pulse so that the center of the width of the square wave pulse is located at the reference time.
  • the present invention is not limited to such a configuration, and generates a square wave pulse so that the rising edge of the square wave pulse is located at the reference time point, or the square wave is positioned so that the falling edge of the square wave pulse is located at the reference time point. Generating pulses.
  • the dimming signal having an extended or reduced width of the square wave signal is generated according to the height of the dimming level (S73). Adjusting the position of the leading edge and the trailing edge of the square wave signal extends the positions of the leading edge and / or trailing edge of the square wave signal from both sides of the reference point by a predetermined width according to the height of the dimming level in the square wave signal generated at the reference point. Responds to shrinking.
  • the dimming signal may correspond to a signal for adjusting a length of a light emitting section, which is a time at which an LED light source unit having a plurality of light emitting diode (LED) groups emits light.
  • a driving control signal for limiting at least one of the input voltage, the driving voltage according to the input voltage, and the driving current based on the dimming signal is applied to the LED light source unit to emit light as the magnitude of the input voltage increases under the dimming level.
  • driving and dimming of the LED light source unit is controlled to reduce the number of LED groups emitting light (S74).
  • the present embodiment it is possible to control the dimming of the LED light source unit based on the light emission of the entire LED group while driving control of the plurality of LED groups of the LED light source unit in a sequential driving manner.
  • FIG. 8 to 12 are views illustrating the AC LED driving and dimming control method of FIG. 7 according to dimming levels.
  • the AC LED driving and dimming control device has a maximum input voltage Vin.
  • a square wave signal is generated at the reference time point t0, which is a time point having a value, and the LED light source unit is driven and dimmed based on the generated square wave signal.
  • the square wave signal may be used as the dimming signal RS1.
  • the square wave signal may be used to generate the dimming signal RS1 whose length is extended or reduced by a predetermined width.
  • the driving control signal based on the dimming signal RS1 when the driving control signal based on the dimming signal RS1 is applied to the fourth driving switch of the LED light source unit, the driving voltage and the driving current I LED according to the input voltage Vin are specified in the sub-section of the input periodic voltage. It is supplied to the LED light source unit during t1 to t2, and the entire first to fourth LEDs D1, D2, D3, and D4 are turned on substantially simultaneously during the specific sub-section.
  • the specific sub section corresponds to the first sub section SP1 and also corresponds to the width section of the square wave signal or the dimming signal RS1.
  • the fourth driving switch may correspond to a driving switch in which a first terminal (eg, a drain of the n-channel MOSFET) is connected to the cathode of the fourth light emitting diode.
  • the AC LED driving and dimming control device has a maximum input voltage Vin.
  • the square wave signal is generated at the reference time point t0, and the front and rear edges of the generated square wave signal are symmetrically extended or reduced from both sides of the reference time point to generate the dimming signal RS2.
  • the dimming signal RS2 of this embodiment has a width extending from the dimming signal RS1 of FIG. 8 and a width smaller than the dimming signal RS3 of FIG. 10 to be described below.
  • the generated square wave signal is preferably located at the center of the square wave signal so that the reference point divides the width of the square wave signal, but the present invention is not limited to such a configuration, and the leading edge or trailing edge of the square wave signal is It may be generated to be located at the reference point.
  • the AC LED driving and dimming control device applies a driving control signal based on the dimming signal RS2 to the driving switch of the LED light source unit during the specific sub period t3 to t4.
  • the LED emission controller turns on the third driving switch in the first sub-section SP2 based on the dimming signal SP2 and turns on the fourth driving switch in the second sub-section SP1.
  • the third driving switch is turned on.
  • the first, second and fourth drive switches have a turn-off state in the first and third sub-sections
  • the first, second and third drive switches have a turn-off state in the second sub-sections.
  • the second sub period corresponds to the first sub period in FIG. 8.
  • the driving control signal based on the dimming signal RS2 is selectively applied to the third and fourth driving switches of the LED light source unit according to the input voltage Vin, the driving voltage according to the input voltage Vin and The driving current I LED is supplied to the LED light source unit during the sub period t3 to t4 of the input periodic voltage. That is, when the driving current is supplied to the LED light source unit according to the operation of the third and fourth driving switches, the first to third LEDs D1, D2, and D3 are turned on in the first sub-section SP2, and the second sub The entire first to fourth LEDs D1, D2, D3, and D4 are turned on in the section SP1, and the first to third LEDs D1, D2, and D3 are turned on in the third sub section SP3.
  • each of the first sub-section and the third sub-section corresponds to a half (1/2) of the second sub-section.
  • the AC LED driving and dimming control apparatus has a light output of four light emitting diodes lit per unit time at the first dimming level of FIG. 8, and emits light per unit time at the second dimming level. It has a light output of seven diodes.
  • the AC LED driving and dimming control device has a maximum input voltage Vin.
  • a square wave signal is generated at the reference time point t0, and the front and rear edges of the generated square wave signal are symmetrically symmetrical from both sides of the reference time point to generate the dimming signal RS3.
  • the AC LED driving and dimming control device applies a driving control signal based on the dimming signal RS3 to the driving switch of the LED light source unit during the specific sub period t5 to t6.
  • the LED emission controller turns on the third driving switch in the first sub-section SP2 based on the dimming signal RS3 and turns on the fourth driving switch in the second sub-section SP1.
  • the third driving switch is turned on.
  • the first, second and fourth drive switches have a turn-off state in the first and third sub-sections
  • the first, second and third drive switches have a turn-off state in the second sub-sections. .
  • the driving control signal based on the dimming signal RS3 is selectively applied to the third and fourth driving switches of the LED light source unit according to the input voltage Vin, the driving voltage according to the input voltage Vin.
  • a driving current I LED is supplied to the LED light source in a specific sub period t5 to t6 of the input period voltage.
  • driving current is supplied to the LED light source unit according to the sequential operation of the third and fourth driving switches, the first to third LEDs D1, D2, and D3 are turned on in the first sub-section SP2, and the second sub-section is turned on.
  • the entire first to fourth LEDs D1, D2, D3, and D4 are lit at SP1, and the first to third LEDs D1, D2, D3 are lit at the third sub-section SP3.
  • the lengths of the first to third sub-sections may be substantially the same.
  • the alternating current LED driving and dimming control apparatus has a light output of four light emitting diodes lit per unit time at the first dimming level of FIG. 8, and emits light per unit time at the third dimming level. It has a light output of 10 diodes.
  • the AC LED driving and dimming control device is a point in time at which the input voltage Vin has a maximum value.
  • a square wave signal is generated at the reference time point t0, and the front and rear edges of the generated square wave signal are adjusted to be symmetrical with respect to the reference point at both sides of the reference point to generate the dimming signal RS4.
  • the AC LED driving and dimming control device applies a driving control signal based on the dimming signal RS4 to the driving switch of the LED light source unit during the specific sub period t7 to t8. That is, the LED light emission controller turns on the second driving switch in the first sub-section SP4 through the PWM driving control signal based on the dimming signal RS4 and turns on the third driving switch in the second sub-section SP2. Turn on, turn on the fourth drive switch in the third sub-section SP1, turn on the third drive switch in the fourth sub-section SP3, and turn on the fourth drive switch in the fifth sub-section SP5. 2 Turn the drive switch on.
  • the first, third and fourth driving switches have a turn-off state in the first and fifth sub-sections, and the first, second and fourth driving switches are turned off in the second and fourth sub-sections. Has a state, and in the third sub-section, the first, second and third driving switches have a turn-off state.
  • the driving control signal based on the dimming signal RS4 is selectively applied to the second, third and fourth driving switches of the LED light source unit according to the input voltage Vin, the driving voltage is applied to the input voltage Vin.
  • the driving voltage and the driving current (I LED ) is supplied to the LED light source in a specific sub period (t7 ⁇ t8) of the input period voltage.
  • the first and second LEDs D1 and D2 are turned on in the first sub-section SP4, and The first to third LEDs D1, D2, and D3 are turned on in the second sub period SP2, and the first to fourth LEDs D1, D2, D3, and D4 are turned on in the third sub period SP1.
  • the first to third LEDs D1, D2, and D3 light up in the fourth sub period SP3, and the first and second LEDs D1 and D2 light up in the fifth sub period SP5.
  • the lengths of the second to fourth sub-sections may be substantially the same, and the lengths of the first and fifth sub-sections may correspond to half of the third sub-sections.
  • the alternating current LED driving and dimming control apparatus has a light output of four light emitting diodes lit per unit time at the first dimming level of FIG. 8, and emits light per unit time at the fourth dimming level. It has a light output of 12 diodes.
  • the AC LED driving and dimming control device is a point in time at which the input voltage Vin has a maximum value.
  • the square wave signal is generated at the reference time point t0, and the dimming signal RS5 is generated by adjusting the leading edge and the trailing edge of the generated square wave signal on both sides of the reference time to be symmetrical with respect to the reference time point.
  • the AC LED driving and dimming control device applies a driving control signal based on the dimming signal RS5 to the driving switch of the LED light source unit during the specific sub period t9 to t10. That is, the LED emission controller turns on the second driving switch in the first sub-section SP4 through the PWM driving control signal based on the dimming signal RS5 and turns on the third driving switch in the second sub-section SP2. Turn on, turn on the fourth drive switch in the third sub-section SP1, turn on the third drive switch in the fourth sub-section SP3, and turn on the fourth drive switch in the fifth sub-section SP5. 2 Turn the drive switch on.
  • the first, third and fourth driving switches have a turn-off state in the first and fifth sub-sections, and the first, second and fourth driving switches are turned off in the second and fourth sub-sections. Has a state, and in the third sub-section, the first, second and third driving switches have a turn-off state.
  • the driving control signal based on the dimming signal RS5 is selectively applied to the second, third and fourth driving switches of the LED light source unit according to the input voltage Vin, the driving voltage is applied to the input voltage Vin.
  • the driving voltage and the driving current (I LED ) is supplied to the LED light source in a specific sub period (t9 ⁇ t10) of the input period voltage.
  • the first and second LEDs D1 and D2 are turned on in the first sub-section SP4, and The first to third LEDs D1, D2, and D3 are turned on in the second sub period SP2, and the first to fourth LEDs D1, D2, D3, and D4 are turned on in the third sub period SP1.
  • the first to third LEDs D1, D2, and D3 light up in the fourth sub period SP3, and the first and second LEDs D1 and D2 light up in the fifth sub period SP5.
  • the lengths of the first to fifth sub-sections may be substantially the same.
  • the AC LED driving and dimming control apparatus has a light output of four light emitting diodes lit per unit time at the first dimming level of FIG. 8, and emits light per unit time at the fifth dimming level. It has a light output of 14 diodes.
  • FIG. 13 is a view showing an AC LED driving and dimming control method according to another embodiment of the present invention according to the dimming level.
  • the AC LED driving and dimming control method according to the above-described embodiment with reference to FIGS. 8 to 12 corresponds to a case in which a dimming signal extended or reduced symmetrically with respect to the reference time point is used, and FIG.
  • the AC LED driving and dimming control method corresponds to a case in which the front and rear edges of the square wave signal use dimming signals extended or reduced in different widths based on the reference time point.
  • the AC LED driving and dimming control apparatus generates a square wave pulse at a reference time point at which the input voltage has a maximum value, and the front and rear edge portions of the square wave signal at both sides of the reference time point.
  • the AC LED driving and dimming control device applies a driving control signal for limiting at least one of an input voltage, a driving voltage according to the input voltage, and a driving current based on the dimming signal to the LED light source unit to control the input voltage under the dimming level.
  • the driving and dimming of the LED light source unit may be controlled so that the number of LED groups emitting light increases or the number of LED groups emitting light decreases as the size of the input voltage decreases.
  • the AC LED driving and dimming control device When the dimming level is the sixth dimming level, the AC LED driving and dimming control device generates a square wave signal at a reference time point t0 at which the input voltage Vin has a maximum value, and the leading edge of the generated square wave signal.
  • the rear and rear edges are adjusted to be positioned at points of different widths from both sides of the reference point to generate the left and right asymmetric dimming signals RS6 with respect to the reference point.
  • the AC LED driving and dimming control device applies a driving control signal based on the dimming signal RS6 to the driving switch of the LED light source unit during the specific sub period t9 to t11. That is, the LED emission controller turns on the second driving switch in the first sub-section SP4 through the PWM driving control signal based on the dimming signal RS5 and turns on the third driving switch in the second sub-section SP2. Turn on, turn on the fourth driving switch in the third sub-section SP1, turn on the third driving switch in the fourth sub-section SP3.
  • the first, third and fourth driving switches have a turn-off state in the first sub-section
  • the first, second and fourth driving switches have a turn-off state in the second and fourth sub-sections.
  • the first, second and third driving switches have a turn-off state.
  • the driving control signal based on the dimming signal RS6 is selectively applied to the second, third and fourth driving switches of the LED light source part in accordance with the input voltage Vin, the driving voltage is applied to the input voltage Vin.
  • the driving voltage and the driving current (I LED ) is supplied to the LED light source in a specific sub period (t9 ⁇ t11) of the input period voltage.
  • the first and second LEDs D1 and D2 are turned on in the first sub-section SP4, and The first to third LEDs D1, D2, and D3 are turned on in the second sub period SP2, and the first to fourth LEDs D1, D2, D3, and D4 are turned on in the third sub period SP1.
  • the first to third LEDs D1, D2, and D3 light up.
  • the combination of the left and right asymmetric dimming signals in FIGS. 8 to 12 eliminates the problem of partial lighting in the LED dimming control and enables the implementation of a dense dimming level.
  • the present invention in the AC LED driving and dimming control apparatus and method of the present invention, if the input voltage is a square wave signal or a similar signal generated corresponding to a reference point having a maximum value, the center portion of the signal is on the reference point. It can be seen that the present invention can be applied regardless of whether it is located at the front edge or the trailing edge of the signal.
  • the alternating current LED driving and dimming control apparatus and method if the signal generated in response to the reference time so as to be based on the entire lighting of the light emitting diode of the LED light source when controlling the light output of the LED light source unit Both left-right symmetrical or left-right asymmetric dimming signals of the reference time point may be used.
  • the present invention relates to an AC light emitting diode driving and dimming control device and method thereof.

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Abstract

The present invention relates to a device and method for controlling the operation and dimming of an AC LED that may control the optical output of an AC LED light source based on the overall lighting of the LED. The device for controlling the operation and dimming of the AC LED includes: an input voltage receiving unit receiving an input voltage of which the magnitude varies regularly over time; a dimming control unit creating a signal for adjusting, depending on a dimming level, the length of a light-emitting section during which the LED light source including a plurality of LED groups emits light, wherein the signal is a dimming signal which is created by extending or reducing the width of a square signal depending on the dimming level by adjusting the locations of the leading edge and trailing edge of the square signal created at a reference time at which the input voltage has a maximum value to a certain width on both sides; and an LED light-emitting control unit applying, to the LED light source, an operation control signal limiting at least one of the input voltage, an operation voltage and an operation current according to the input voltage in response to the dimming signal and controlling the operation and dimming of the LED light source so that the number of LED groups emitting light increases as the magnitude of the input voltage increases under the dimming level or so that the number of LED groups emitting light decreases as the magnitude of the input voltage decreases.

Description

교류 ＬＥＤ 구동 및 조광 제어장치와 그 방법AC LED drive and dimming control device and method
본 발명은 교류 발광다이오드 구동 및 조광 제어장치와 그 방법에 관한 것으로, 보다 상세하게는, 교류 발광다이오드 광원부의 광 출력을 발광다이오드의 전체 점등을 기본으로 하여 제어할 수 있는 교류 발광다이오드 구동 및 조광 제어 장치와 그 방법에 관한 것이다.The present invention relates to an AC light emitting diode driving and dimming control apparatus and a method thereof, and more particularly, to an AC light emitting diode driving and dimming which can control the light output of the AC light emitting diode light source based on the entire lighting of the LED. It relates to a control device and a method thereof.
조광 장치(Dimmer)는 램프의 조도를 조절하거나 변화시키는 장치를 지칭하는 말로서, 트라이액(Triac) 스위치나 FET(Field effect transistor) 스위치 등을 이용한 위상제어 조광기가 널리 이용되고 있다.Dimmer refers to a device for adjusting or changing the illuminance of a lamp, and a phase control dimmer using a triac switch or a field effect transistor (FET) switch is widely used.
종래의 위상제어 조광기를 구비한 교류 LED(Light emitting diode) 조명 시스템의 일례가 도 1에 도시되어 있다. 도 1은 미국등록특허 제7,081,722호의 LED 다중위상 구동 회로를 이용하는 종래의 교류 LED 조명 시스템에 위상제어 조광기를 부가한 형태로 도시되어 있다.An example of an alternating light emitting diode (LED) lighting system with a conventional phase controlled dimmer is shown in FIG. 1. 1 is shown in the form of adding a phase control dimmer to a conventional AC LED lighting system using an LED multiphase driving circuit of US Pat. No. 7,081,722.
도 1에 도시한 바와 같이, 종래의 교류 LED 조명 시스템은 위상제어 조광기(2)와 교류(AC) LED 모듈(4)을 구비하고, 교류 LED 모듈(4)은 정류기(Rectifier)와 복수의 LED 그룹(Group 1, Group 2, …… Group n)(n은 임의의 자연수)과 각 LED 그룹을 독립적으로 또는 순차적으로 온(ON) 구동하기 위한 복수의 구동스위치(PS1, PS2, …… PSn)를 구비한다. 각 LED 그룹은 하나 이상의 발광다이오드 소자를 구비하고, 복수의 발광다이오드 소자를 구비하는 경우, 그것들은 서로 직렬 또는 직-병렬 연결된다.As shown in FIG. 1, a conventional AC LED lighting system includes a phase control dimmer 2 and an AC LED module 4, and the AC LED module 4 includes a rectifier and a plurality of LEDs. A plurality of driving switches PS 1 , PS 2 ,... For driving the groups (Group 1, Group 2, ..., Group n) (n is an arbitrary natural number) and each LED group independently or sequentially. PS n ). Each LED group has one or more light emitting diode elements, and when there are a plurality of light emitting diode elements, they are connected in series or in parallel with each other.
종래의 위상제어 조광기를 구비한 교류 LED 조명 시스템에서는 교류 LED 모듈(4)의 광 출력을 원하는 세기로 조절하기 위해 정류기의 입력단에 연결된 조광기(2)를 통해 입력 교류 전압(VAC)의 위상을 제어하도록 구성된다. 즉, 교류 LED 조명 시스템에서는 위상제어 조광기(2)에서의 조광레벨의 고저에 따라, 조광기(2) 내 스위칭 소자의 지연 동작을 통해 입력 주기 전압의 위상 일부를 제거하고, 그에 의해 입력 주기 전압의 남은 위상 구간에 대응하여 복수의 LED 그룹의 광 출력을 제어한다.In the conventional AC LED lighting system having a phase control dimmer, the phase of the input AC voltage V AC is adjusted through the dimmer 2 connected to the input of the rectifier in order to adjust the light output of the AC LED module 4 to a desired intensity. Configured to control. That is, in the AC LED lighting system, according to the height of the dimming level in the phase control dimmer 2, a part of the phase of the input periodic voltage is removed through the delay operation of the switching element in the dimmer 2, thereby The light output of the plurality of LED groups is controlled corresponding to the remaining phase section.
예를 들어, 도 2 및 도 3에 도시한 바와 같이, 교류 LED 조명 시스템은 순방향 또는 역방향 위상제어 방식으로 동작하는 위상제어 조광기(2)로부터 입력 교류 전압의 주기 파형에서 조광기 내 지연 동작(S OFF 구간에 대응)에 의해 전연부(leading edge) 또는 후연부(trailing edge)가 제거된 출력 전압(S ON 구간에 대응)을 수신하고, 수신한 출력 전압의 파형을 추종하는 계단형의 구동 전류(LED 전류)를 복수의 LED 그룹에 공급함으로써 조광기(2)에서의 조광레벨의 고저에 따라 복수의 LED 그룹의 광출력(LED 광출력)을 제어한다.For example, as shown in Figs. 2 and 3, the AC LED illumination system has a delay operation in the dimmer in the periodic waveform of the input AC voltage from the phase control dimmer 2 operating in the forward or reverse phase control scheme (S OFF). Step-by-step driving current for receiving the output voltage (corresponding to the S ON section) with the leading edge or the trailing edge removed, and following the waveform of the received output voltage (corresponding to the section). By supplying the LED current) to the plurality of LED groups, the light output (LED light output) of the plurality of LED groups is controlled in accordance with the height of the dimming level in the dimmer 2.
전술한 종래 기술의 교류 LED 조명 시스템에서는, LED 전류가 조광기(2)의 출력 전압의 파형을 추종하도록 복수의 LED 그룹 중 어느 제2 LED 그룹이 턴-온 될 때 그 바로 앞 시점에서 턴-온된 제1 LED 그룹을 턴-오프하는 방식으로 복수의 LED 그룹을 순차구동함으로써 시스템의 전력 손실을 감소시킨다.In the above-described AC LED lighting system of the prior art, when any second LED group of the plurality of LED groups is turned on so that the LED current follows the waveform of the output voltage of the dimmer 2, it is turned on at the point immediately before it. Sequentially driving the plurality of LED groups in a manner to turn off the first LED group reduces power loss of the system.
그러나, 트라이액 스위치를 이용하는 종래의 위상제어 조광기를 교류 LED 조명 시스템의 조광기로 사용하는 경우, 트라이액 소자 고유의 특징인 돌입전류(Inrush current), 래칭전류(Latching current), 홀드전류(Hold current) 등의 조건을 충족시킬 수 있도록 별도의 부가적인 회로를 구비해야만 한다. 따라서, 조광기의 구조가 복잡해지고 제조 비용이 증가하는 단점이 있다.However, when a conventional phase control dimmer using a triac switch is used as a dimmer of an AC LED lighting system, the inrush current, latching current, and hold current characteristic of the triac element are unique. A separate additional circuit must be provided to satisfy the conditions such as Therefore, there is a disadvantage that the structure of the dimmer is complicated and the manufacturing cost increases.
또한, FET 등의 반도체 스위치를 이용하는 종래의 위상제어 조광기를 교류 LED 조명 시스템의 조광기로 사용하는 경우, 트라이액 스위치를 이용한 조광기보다 조광 제어 특성은 좋지만, 조광 범위가 좁은 단점이 있다. 게다가, 교류 LED 조명 시스템에서는 위상제어 조광기의 출력 전압의 파형에 의해 부분 점등 현상을 발생시키는 단점이 있다.In addition, when a conventional phase control dimmer using a semiconductor switch such as a FET is used as a dimmer of an AC LED lighting system, the dimming control characteristic is better than a dimmer using a triac switch, but has a disadvantage in that the dimming range is narrow. In addition, in the AC LED lighting system, there is a disadvantage that partial lighting occurs due to the waveform of the output voltage of the phase control dimmer.
예를 들어, 도 2에 도시한 바와 같이, 교류 LED의 동작 구간은 입력 주기 전압의 최대값에서 주기 전압의 영전위까지가 되는데, 순방향 위상제어 방식의 조광기의 경우 입력 주기 전압의 최대값 지점에서부터 영전위까지 서서히 감소함에 따라서 LED 그룹들이 단계적으로 소등하기 시작하고, 따라서, 교류 LED 모듈(4)에서는 특정 LED 그룹이 먼저 소등하게 되어 부분 점등(Local dimming) 현상과 같은 문제가 발생하는 단점이 있다.For example, as shown in Fig. 2, the operation period of the AC LED is from the maximum value of the input period voltage to the zero potential of the period voltage, in the case of the forward phase control type dimmer from the maximum value point of the input period voltage As the LED group gradually decreases to zero potential, the LED groups start to turn off step by step, and therefore, in the AC LED module 4, there is a disadvantage that a specific LED group is turned off first so that a problem such as local dimming occurs. .
위의 경우와 유사하게, 도 3에 도시한 바와 같이, FET 스위치를 이용한 역방향 위상제어 방식의 조광기의 경우, 입력 주기 전압의 영전위 지점에서부터 전압의 최대값까지 서서히 증가함에 따라 LED 광원부 내의 LED 그룹들 중 특정 LED 그룹이 먼저 점등하기 시작하고, 따라서 LED 광원부에서는 적어도 하나의 발광다이오드를 구비한 특정 LED 그룹이 빈번히 먼저 점등하게 되어 부분 점등 현상과 같은 문제가 발생하는 단점이 있다.Similarly to the above case, as shown in FIG. 3, in the case of the reverse phase control dimmer using the FET switch, the LED group in the LED light source unit gradually increases from the zero potential point of the input periodic voltage to the maximum value of the voltage. Among them, a specific LED group starts to light up first, and therefore, a specific LED group having at least one light emitting diode is frequently turned on first in the LED light source unit, which causes a problem such as a partial lighting phenomenon.
전술한 종래 기술의 부분 점등 현상을 조광레벨의 고저의 일례에 따라 도시하면 도 4와 같다. 도 4에서 서로 직렬 연결된 4개의 발광다이오드(D1, D2, D3, D4)는 도 1의 복수의 LED 그룹 중 4개의 LED 그룹에 각각 대응할 수 있다.The above-described partial lighting phenomenon of the prior art is shown in FIG. 4 according to an example of the height of the dimming level. In FIG. 4, the four light emitting diodes D1, D2, D3, and D4 connected to each other in series may correspond to four LED groups among the plurality of LED groups of FIG. 1.
도 4에 도시한 바와 같이, 조광기(2)에서 4개의 조도 레벨 중 가장 낮은 조도 레벨인 제1 조광레벨(DL1)이 설정되고 설정된 제1 조광레벨에 따라 조광기(2)가 입력 교류 전압을 위상제어하면, 각 발광다이오드의 캐소드에 직렬 연결되는 복수의 구동 스위치 중 제1 구동 스위치(PS1)에 구동제어신호가 인가되면, 주기 전압 파형의 제1 서브 구간(SP1)에서 제1 발광다이오드(D1)만이 점등한다.As shown in FIG. 4, in the dimmer 2, the first dimming level DL1, which is the lowest illuminance level among four illuminance levels, is set, and the dimmer 2 phases the input AC voltage according to the set first dimming level. When controlling, when the driving control signal is applied to the first driving switch PS 1 among the plurality of driving switches connected in series with the cathodes of the respective light emitting diodes, the first light emitting diode ( Only D1) lights up.
이와 유사하게, 제2 조광레벨(DL2)에서 제2 구동 스위치(PS2)에 구동제어신호가 인가되면, 주기 전압의 제1 서브 구간(SP1)에서 제1 발광다이오드(D1)가 먼저 점등하고, 이어서 제2 서브 구간(SP2)에서 제1 및 제2 발광다이오드(D1, D2)가 점등한다. 제3 조광레벨(DL3)에서 제3 구동 스위치(미도시)에 구동제어신호가 인가되면, 주기 전압 파형의 제1 서브 구간(SP1)에서 제1 발광다이오드(D1)가 점등하고, 제1 서브 구간에 이어지는 제2 서브 구간(SP2)에서 제1 및 제2 발광다이오드(D1, D2)가 점등하고, 제2 서브 구간에 이어지는 제3 서브 구간(SP3)에서 제1 내지 제3 발광다이오드(D1, D2, D3)가 점등한다. 그리고, 제4 조광레벨(DL3)에서 제4 구동 스위치(미도시)에 구동제어신호가 인가되면, 주기 전압의 제1 서브 구간(SP1)에서 제1 발광다이오드(D1)가 점등하고, 제1 서브 구간에 이어지는 제2 서브 구간(SP2)에서 제1 및 제2 발광다이오드(D1, D2)가 점등하고, 제2 서브 구간에 이어지는 제3 서브 구간(SP3)에서 제1 내지 제3 발광다이오드(D1, D2, D3)가 점등하고, 제3 서브 구간에 이어지는 제4 서브 구간(SP4)에서 제1 내지 제4 발광다이오드(D1, D2, D3, D4)가 점등한다.Similarly, when the driving control signal is applied to the second driving switch PS 2 at the second dimming level DL2, the first light emitting diode D1 is first turned on in the first sub period SP1 of the periodic voltage. Subsequently, the first and second light emitting diodes D1 and D2 are turned on in the second sub period SP2. When the driving control signal is applied to the third driving switch (not shown) at the third dimming level DL3, the first light emitting diode D1 is turned on in the first sub-section SP1 of the periodic voltage waveform, and the first sub-LED is turned on. The first and second light emitting diodes D1 and D2 are turned on in the second sub-section SP2 following the section, and the first to third light-emitting diodes D1 in the third sub-section SP3 following the second sub-section. , D2, D3) light up. When the driving control signal is applied to the fourth driving switch (not shown) at the fourth dimming level DL3, the first light emitting diode D1 is turned on in the first sub-section SP1 of the periodic voltage, and the first light emitting diode D1 is turned on. The first and second light emitting diodes D1 and D2 are turned on in the second sub-section SP2 following the sub-section, and the first to third light emitting diodes (3) in the third sub-section SP3 following the second sub-section SP3. D1, D2, and D3 are turned on, and the first to fourth light emitting diodes D1, D2, D3, and D4 are turned on in the fourth sub-section SP4 following the third sub-section.
위에서 설명한 바와 같이, 종래의 교류 LED 조명 시스템에서는 조광기가 입력 교류 전압을 위상 제어할 때, 위상제어된 주기 전압의 파형에 따라 특정 발광다이오드(제1 발광다이오드)만 켜지는 구간이 많기 때문에 부분 점등의 문제가 발생한다. 게다가, 특정 발광다이오드는 과도한 발광으로 인하여 상대적으로 수명이 짧아지고 그에 따라 다른 발광다이오드의 수명과는 상관없이 해당 LED 그룹이나 조명 시스템 전체의 수명이 짧아지는 문제점이 있다.As described above, in the conventional AC LED lighting system, when the dimmer phase-controls the input AC voltage, there are many sections in which only a specific light emitting diode (first light emitting diode) is turned on according to the waveform of the phase-controlled periodic voltage. Problem occurs. In addition, certain light emitting diodes have a relatively short lifespan due to excessive light emission, thereby shortening the lifespan of the corresponding LED group or the entire lighting system regardless of the lifespan of other light emitting diodes.
본 발명은 상기의 문제점을 해결하기 위한 것으로, 본 발명에 따른 교류 발광다이오드(LED) 구동 및 조광 제어장치와 그 방법은, LED 광원부의 광 출력을 발광다이오드의 전체 점등을 기본으로 하여 제어함으로써 LED 광원부에서의 부분 점등 현상을 제거하고 수명을 향상시키는 것을 목적으로 한다.The present invention is to solve the above problems, AC light emitting diode (LED) driving and dimming control apparatus and method according to the present invention, LED by controlling the light output of the LED light source unit on the basis of the overall lighting of the LED It aims at eliminating the partial lighting phenomenon in a light source part and improving lifetime.
본 발명의 실시예에 따른 교류 LED 구동 및 조광 제어장치와 그 방법은, LED 광원부의 광 출력을 발광다이오드의 전체 점등을 기본으로 하여 다중위상(multiphase) 또는 순차구동 방식으로 제어함으로써 LED 광원부에서의 부분 점등 현상을 제거하고 시스템 효율과 수명을 향상시키는 것을 다른 목적으로 한다.An AC LED driving and dimming control apparatus and method thereof according to an embodiment of the present invention, by controlling the light output of the LED light source unit in a multiphase or sequential driving method based on the entire lighting of the light emitting diode in the LED light source unit Another aim is to eliminate partial lighting and improve system efficiency and lifespan.
상기의 목적을 달성하기 위해 본 발명에 따른 교류 발광다이오드(Light Emitting Diode, LED) 구동 및 조광 제어장치는, 시간에 따라 주기적으로 전압의 크기가 변하는 입력전압을 수신하는 입력전압 수신부; 조광레벨의 고저에 따라 복수의 LED(Light emitting diode) 그룹을 구비한 LED 광원부가 발광하는 시간인 발광구간의 길이를 조절하기 위한 신호로서, 입력전압이 최대값을 가지는 시점인 기준시점에서 생성된 구형파 신호의 전연부(raising edge) 및 후연부(falling edge)의 위치를 기준시점 양측에서 일정 폭으로 조정함으로써 조광레벨의 고저에 따라 구형파 신호의 폭이 연장되거나 축소된 조광신호를 생성하는 조광 제어부; 및 조광신호에 응답하여 입력전압, 상기 입력전압에 따른 구동전압 및 구동전류 중 적어도 어느 하나를 제한하는 구동제어신호를 LED 광원부에 인가함으로써 조광레벨 하에서 입력전압의 크기가 증가함에 따라 발광하는 LED 그룹의 수가 증가하거나 입력전압의 크기가 감소함에 따라 발광하는 LED 그룹의 수가 감소하도록 LED 광원부의 구동 및 조광을 제어하는 LED 발광제어부;를 포함하는 것을 특징으로 한다.In order to achieve the above object, an AC light emitting diode (LED) driving and dimming control device according to the present invention includes: an input voltage receiving unit receiving an input voltage whose voltage varies periodically with time; A signal for adjusting the length of a light emitting section, which is a time that an LED light source having a plurality of light emitting diode (LED) groups emits light according to a high level of dimming level, and is generated at a reference time point when an input voltage has a maximum value. A dimming control unit for generating a dimming signal in which the width of the square wave signal is extended or reduced in accordance with the height of the dimming level by adjusting the positions of the rising edge and the falling edge of the square wave signal at both sides of the reference point. ; And an LED group emitting light as the magnitude of the input voltage increases under the dimming level by applying a driving control signal for limiting at least one of an input voltage, a driving voltage according to the input voltage, and a driving current in response to the dimming signal. LED emission control unit for controlling the driving and dimming of the LED light source unit to reduce the number of LED groups to emit light as the number of or increases the size of the input voltage is characterized in that it comprises a.
본 발명의 실시예에 따른 교류 LED 구동 및 조광 제어장치에 있어서, 조광 제어부는, 구형파 신호의 전연부(raising edge) 및 후연부(falling edge)의 위치를 기준시점을 기준으로 좌우 대칭적으로 조정함으로써 조광레벨의 고저에 따라 구형파 신호의 폭이 연장되거나 축소된 조광신호를 생성하는 것을 특징으로 한다.In the AC LED driving and dimming control apparatus according to an embodiment of the present invention, the dimming control unit, the left and right edges of the square wave signal is adjusted to the left and right symmetrically relative to the reference point position As a result, a dimming signal having an extended or reduced width of the square wave signal may be generated according to a high or low dimming level.
본 발명의 다른 실시예에 따른 교류 LED 구동 및 조광 제어장치에 있어서, 조광 제어부는 구형파 신호의 전연부(raising edge) 및 후연부(falling edge)의 위치를 기준시점을 기준으로 기준시점 양측에서 서로 다른 거리에 위치하도록 조정함으로써, 조광레벨의 고저에 따라 구형파 신호의 폭이 연장되거나 축소된 조광신호를 생성하는 것을 특징으로 한다.In the AC LED driving and dimming control device according to another embodiment of the present invention, the dimming control unit is located on both sides of the reference point with respect to the reference point with respect to the position of the rising edge and the falling edge of the square wave signal. By adjusting it to be located at a different distance, it is characterized in that for generating a dimming signal, the width of the square wave signal is extended or reduced in accordance with the height of the dimming level.
본 발명의 다른 실시예에 따른 교류 LED 구동 및 조광 제어장치에 있어서, 조광 제어부는, 입력전압의 영점을 검출하는 영점 검출부; 영점에 기초하여 입력전압이 최대값을 가지는 시점인 기준시점을 검출하는 위상 검출부; 및 구형파 펄스의 전연부(raising edge) 및 후연부(falling edge)가 조광레벨의 고저에 따라 기준시점을 기준으로 기준시점 양측으로 일정 폭만큼 연장된 조광신호를 생성하는 조광신호 생성부를 구비하는 것을 특징으로 한다.In the AC LED driving and dimming control apparatus according to another embodiment of the present invention, the dimming control unit, the zero point detection unit for detecting the zero point of the input voltage; A phase detector configured to detect a reference time point at which the input voltage has a maximum value based on the zero point; And a dimming signal generating unit for generating a dimming signal extending by a predetermined width to both sides of the reference point of view based on the elevation of the dimming level of the rising edge and the falling edge of the square wave pulse. It features.
본 발명의 다른 실시예에 따른 교류 LED 구동 및 조광 제어장치에 있어서, LED 발광제어부는, 조광신호에 기초하여 복수의 LED 그룹을 순차구동하기 위한 구동제어신호를 출력하는 PWM(Pulse Width Modulation) 컨트롤러를 구비하는 것을 특징으로 한다.In the AC LED driving and dimming control apparatus according to another embodiment of the present invention, the LED light emission control unit, PWM (Pulse Width Modulation) controller for outputting a drive control signal for sequentially driving a plurality of LED groups based on the dimming signal Characterized in having a.
본 발명의 다른 실시예에 따른 교류 LED 구동 및 조광 제어장치에 있어서, 교류 LED 구동 및 조광 제어장치는, 복수의 LED 그룹에 흐르는 전류를 각각 제어하기 위한 복수의 구동 스위치를 더 포함한다. 여기서, 각 LED 그룹에 직렬 연결되는 각 구동 스위치는 구동제어신호에 응답하여 선택적으로 온 동작하는 것을 특징으로 한다.In the AC LED driving and dimming control apparatus according to another embodiment of the present invention, the AC LED driving and dimming control apparatus further includes a plurality of driving switches for controlling the current flowing through the plurality of LED groups, respectively. Here, each drive switch connected in series to each LED group is characterized in that the selective operation in response to the drive control signal.
본 발명의 다른 실시예에 따른 교류 LED 구동 및 조광 제어장치에 있어서, 교류 LED 구동 및 조광 제어장치는, 구동 스위치를 통해 흐르는 전류를 검출하여 LED 발광제어부에 제공하는 보호회로부를 더 포함하는 것을 특징으로 한다.In the alternating current LED driving and dimming control apparatus according to another embodiment of the present invention, the alternating current LED driving and dimming control apparatus further includes a protection circuit unit which detects a current flowing through the driving switch and provides it to the LED emission control unit. It is done.
본 발명의 다른 실시예에 따른 교류 LED 구동 및 조광 제어장치에 있어서, LED 발광제어부는 보호회로부로부터의 전류검출 신호에 기초하여 복수의 LED 그룹을 정전류 구동하는 것을 특징으로 한다.In the AC LED driving and dimming control apparatus according to another embodiment of the present invention, the LED light emission control unit is characterized in that the constant current drive a plurality of LED groups based on the current detection signal from the protection circuit.
본 발명의 다른 실시예에 따른 교류 LED 구동 및 조광 제어장치에 있어서, 교류 LED 구동 및 조광 제어장치는, 조광레벨의 고저를 조절하기 위한 조광 기준신호를 생성하여 조광 제어부에 공급하는 조광 인터페이스를 더 포함하는 것을 특징으로 한다.In the AC LED driving and dimming control device according to another embodiment of the present invention, the AC LED driving and dimming control device further generates a dimming reference signal for adjusting the height of the dimming level and supplies the dimming interface to the dimming control unit. It is characterized by including.
본 발명의 다른 실시예에 따른 교류 LED 구동 및 조광 제어장치에 있어서, 입력전압 수신부는 입력 교류 전원을 정류하여 입력전압을 출력하는 정류부를 구비하는 것을 특징으로 한다.In the AC LED driving and dimming control apparatus according to another embodiment of the present invention, the input voltage receiving unit is characterized by comprising a rectifying unit for rectifying the input AC power to output the input voltage.
본 발명에 따른 교류 LED 구동 및 조광 제어방법은, 시간에 따라 주기적으로 전압의 크기가 변동하는 입력전압을 수신하는 제1 단계; 입력전압이 최대값을 가지는 시점인 기준시점에서 구형파 신호를 생성하는 제2 단계; 기준시점 양측에서 구형파 신호의 전연부(raising edge)와 후연부(falling edge)의 위치를 조정함으로써 조광레벨의 고저에 따라 구형파 신호의 폭이 연장되거나 축소된 조광신호를 생성하는 제3 단계; 및 조광신호에 기초하여 복수의 LED 그룹을 구비한 LED 광원부에 구동제어신호를 인가함으로써 조광레벨의 고저에 따라 제한된 입력전압에 따른 구동전압 또는 구동전류로 ED 광원부의 구동 및 조광을 제어하는 제4 단계;를 포함하고, LED 광원부는 조광레벨 하에서 입력전압의 크기가 증가함에 따라 발광하는 LED 그룹의 수가 증가하거나 입력전압의 크기가 감소함에 따라 발광하는 LED 그룹의 수가 감소하도록 동작하는 것을 특징으로 한다.An AC LED driving and dimming control method according to the present invention comprises: a first step of receiving an input voltage whose voltage varies periodically with time; Generating a square wave signal at a reference time point at which the input voltage has a maximum value; Generating a dimming signal in which the width of the square wave signal is extended or reduced in accordance with the height of the dimming level by adjusting the positions of the rising edge and the falling edge of the square wave signal at both sides of the reference time point; And controlling the driving and dimming of the ED light source by a driving voltage or a driving current according to a limited input voltage by applying a driving control signal to the LED light source having a plurality of LED groups based on the dimming signal. And the LED light source unit operates to increase the number of LED groups emitting light as the magnitude of the input voltage increases under the dimming level or to decrease the number of LED groups emitting light as the magnitude of the input voltage decreases. .
본 발명의 실시예에 따른 교류 LED 구동 및 조광 제어방법에 있어서, 제3 단계는, 구형파 신호의 전연부(raising edge) 및 후연부(falling edge)의 위치를 기준시점을 기준으로 좌우 대칭적으로 조정함으로써 조광레벨의 고저에 따라 구형파 신호의 폭이 연장되거나 축소된 조광신호를 생성하는 것을 특징으로 한다.In the AC LED driving and dimming control method according to an embodiment of the present invention, the third step, the position of the leading edge (raising edge) and the trailing edge (falling edge) of the square wave signal symmetrically with respect to the reference point By adjusting, the width of the square wave signal is extended or reduced in accordance with the height of the dimming level.
본 발명의 다른 실시예에 따른 교류 LED 구동 및 조광 제어방법에 있어서, 제3 단계는, 구형파 신호의 전연부(raising edge) 및 후연부(falling edge)의 위치를 기준시점을 기준으로 기준시점 양측에서 서로 다른 거리에 위치하도록 조정함으로써, 조광레벨의 고저에 따라 구형파 신호의 폭이 연장되거나 축소된 조광신호를 생성하는 것을 특징으로 한다.In the AC LED driving and dimming control method according to another embodiment of the present invention, the third step, the reference point both sides of the reference point with respect to the position of the rising edge and the falling edge of the square wave signal By adjusting so as to be located at different distances from the, the width of the square wave signal is extended or reduced in accordance with the height of the dimming level to generate a dimming signal.
본 발명의 다른 실시예에 따른 교류 LED 구동 및 조광 제어방법에 있어서, 제4 단계는, 복수의 LED 그룹을 순차구동하는 PWM(Pulse Width Modulation) 구동제어신호를 LED 광원부에 인가함으로써 LED 광원부의 구동 및 조광을 제어하는 것을 특징으로 한다.In the AC LED driving and dimming control method according to another embodiment of the present invention, in the fourth step, the LED light source unit is driven by applying a PWM (Pulse Width Modulation) driving control signal for sequentially driving a plurality of LED groups. And controlling dimming.
본 발명의 다른 실시예에 따른 교류 LED 구동 및 조광 제어방법에 있어서, 교류 LED 구동 및 조광 제어방법은, 구동제어신호에 의해 온 또는 오프 구동되는 구동 스위치를 보호하고 LED 광원부의 구동 전류를 미리 설정된 범위로 제한하기 위해 구동 스위치에 흐르는 전류를 검출하는 단계를 더 포함하는 것을 특징으로 한다.In the alternating current LED driving and dimming control method according to another embodiment of the present invention, the alternating current LED driving and dimming control method protects the driving switch driven on or off by a driving control signal and presets the driving current of the LED light source unit. Detecting current flowing through the drive switch to limit the range.
본 발명의 다른 실시예에 따른 교류 LED 구동 및 조광 제어방법에 있어서, 교류 LED 구동 및 조광 제어방법은, 제3 단계 전에, 조광 인터페이스로부터 조광레벨의 고저를 나타내는 조광 기준 신호를 수신하는 단계를 더 포함하는 것을 특징으로 한다.In the AC LED driving and dimming control method according to another embodiment of the present invention, the AC LED driving and dimming control method further includes, before the third step, receiving a dimming reference signal indicating the height of the dimming level from the dimming interface. It is characterized by including.
본 발명의 다른 실시예에 따른 교류 LED 구동 및 조광 제어방법에 있어서, 제1 단계는, 외부 입력 교류 전원을 정류하여 입력전압을 수신하는 것을 특징으로 한다.In the AC LED driving and dimming control method according to another embodiment of the present invention, the first step is characterized in that for receiving the input voltage by rectifying the external input AC power.
상기의 구성에 의해 본 발명에 따른 교류 발광다이오드(LED) 구동 및 조광 제어장치와 그 방법은, 교류 LED 광원부의 광 출력을 발광다이오드의 전체 점등을 기본으로 하여 제어함으로써 조명 장치나 백라이트 유닛 등으로 사용되는 교류 LED 광원부에서의 부분 점등 현상을 제거하고 교류 LED 광원부와 조명 시스템의 수명을 향상시키는 효과를 제공한다.According to the above configuration, the AC light emitting diode (LED) driving and dimming control device and the method thereof according to the present invention control the light output of the AC LED light source unit based on the entire lighting of the light emitting diodes, so that the lighting device, the backlight unit, or the like is controlled. It provides the effect of eliminating partial lighting phenomenon in the AC LED light source used and improving the life of the AC LED light source and the lighting system.
본 발명의 실시예에 따른 교류 LED 구동 및 조광 제어장치와 그 방법은, 교류 LED 광원부의 광 출력을 발광다이오드의 전체 점등을 기본으로 하여 다중위상(multiphase) 또는 순차구동 방식으로 제어함으로써 교류 LED 광원부에서의 부분 점등 현상을 제거하고 장치의 효율을 높이고 교류 LED 광원부와 조명 시스템의 수명을 향상시키는 효과를 제공한다.AC LED driving and dimming control apparatus and method thereof according to an embodiment of the present invention, the AC LED light source unit by controlling the light output of the AC LED light source unit in a multiphase or sequential driving method based on the entire lighting of the light emitting diodes Eliminates partial lighting in the system, increases the efficiency of the device, and improves the life of the AC LED light source and lighting system.
도 1은 종래의 위상제어 조광기를 구비한 LED(Light emitting diode) 조명 시스템의 일례에 대한 개략적인 블록도.1 is a schematic block diagram of an example of a light emitting diode (LED) lighting system with a conventional phase controlled dimmer.
도 2는 도 1의 LED 조명 시스템의 작동 타이밍도.2 is an operation timing diagram of the LED lighting system of FIG.
도 3은 도 1의 LED 조명 시스템의 다른 작동 타이밍도.3 is another operational timing diagram of the LED lighting system of FIG.
도 4는 도 1의 LED 조명 시스템의 조광레벨에 따른 LED 광원부의 광 출력을 나타낸 도면.4 is a view showing the light output of the LED light source according to the dimming level of the LED lighting system of FIG.
도 5는 본 발명의 실시예에 따른 교류 LED 구동 및 조광 제어장치의 블록도.5 is a block diagram of an AC LED driving and dimming control device according to an embodiment of the present invention.
도 6은 도 5의 교류 LED 구동 및 조광 제어장치의 조광 제어부에 대한 개략적인 블록도.6 is a schematic block diagram of a dimming control unit of the AC LED driving and dimming control device of FIG.
도 7은 본 발명의 실시예에 따른 교류 LED 구동 및 조광 제어방법의 순서도.7 is a flow chart of the AC LED driving and dimming control method according to an embodiment of the present invention.
도 8 내지 도 12는 도 7의 교류 LED 구동 및 조광 제어방법을 조광레벨에 따라 나타낸 도면들.8 to 12 are views illustrating the AC LED driving and dimming control method of FIG. 7 according to dimming levels.
도 13은 본 발명의 다른 실시예에 따른 교류 LED 구동 및 조광 제어방법을 조광레벨에 따라 나타낸 도면.13 is a view showing an AC LED driving and dimming control method according to another embodiment of the present invention according to the dimming level.
* 부호의 설명* Explanation of the sign
10: 교류 LED 구동 및 조광 제어장치10: AC LED drive and dimming controller
11: 입력단11: input
12: 조광제어부12: light control unit
13: LED 발광제어부13: LED light emitting controller
14: 스위칭부14: switching unit
15: 보호회로부15: protection circuit
16: 정류부16: rectifier
17: 제어전원 공급부17: control power supply
18: 조광 인터페이스18: Dimming Interface
본 명세서 및 특허청구범위에 사용된 용어나 단어는 통상적이거나 사전적인 의미로 한정되어 해석되어서는 아니되며, 발명자는 그 자신의 발명을 가장 최선의 방법으로 설명하기 위해 용어의 개념을 적절하게 정의할 수 있다는 원칙에 입각하여 본 발명의 기술적 사상에 부합하는 의미와 개념으로 해석되어야만 한다. 따라서, 본 명세서에 기재된 실시예와 도면에 도시된 구성은 본 발명의 가장 바람직한 일 실시예에 불과할 뿐이고, 본 발명의 기술적 사상을 모두 대변하는 것은 아니므로 본 출원시점에 있어서 이들을 대체할 수 있는 다양한 균등물과 변형예들이 있을 수 있음을 이해하여야 한다.The terms or words used in this specification and claims are not to be construed as being limited to conventional or dictionary meanings, and the inventors may appropriately define the concept of terms in order to best explain their invention in the best way possible. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that it can. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention, and do not represent all of the technical idea of the present invention various that can be substituted for them at the time of the present application It should be understood that there may be equivalents and variations.
본 명세서에서 사용된 용어는 특정 실시예를 설명하기 위하여 사용되므로 본 발명을 제한하기 위한 것이 아니다. 본 명세서에서 사용된 바와 같이, 단수 형태는 문맥상 다른 경우를 분명히 지적하는 것이 아니라면 복수의 형태를 포함할 수 있다.The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise.
도 5는 본 발명의 실시예에 따른 교류 LED(Light emitting diode) 구동 및 조광 제어장치의 블록도이다.5 is a block diagram of an AC LED driving and dimming control device according to an embodiment of the present invention.
도 5를 참조하면, 본 실시예에 따른 교류 LED 구동 및 조광 제어장치(10)는 입력전압 수신부, 조광 제어부(12), LED 발광제어부(13), 스위칭부(14) 및 보호회로부(15)를 구비한다.Referring to FIG. 5, the AC LED driving and dimming control device 10 according to the present embodiment includes an input voltage receiving unit, a dimming control unit 12, an LED emission control unit 13, a switching unit 14, and a protection circuit unit 15. It is provided.
입력전압 수신부는 교류 LED 구동 및 조광 제어장치에 공급되는 입력 교류 전원(6)에 직렬 연결되어 교류 전원(6)을 정류한 입력전압(Vin)과 입력전류를 수신하기 위한 수단이나 구성부이다. 본 실시예에서 입력전압 수신부는 입력 교류 전원(6)을 전파 정류하여 입력전압(Vin) 및 입력전류를 출력하는 정류부(16)를 구비한다. 정류부(16)는 브릿지 다이오드(Bridge diode) 등으로 구현될 수 있다. 그리고, 입력전압 수신부는 교류 전원(6)이 인가되는 입력단(11)을 구비할 수 있다.The input voltage receiver is a means or a component for receiving an input voltage Vin and an input current which are connected in series with an input AC power supply 6 supplied to an AC LED drive and a dimming control device. In this embodiment, the input voltage receiving unit includes a rectifying unit 16 for full-wave rectifying the input AC power supply 6 to output the input voltage Vin and the input current. The rectifier 16 may be implemented as a bridge diode or the like. The input voltage receiver may include an input terminal 11 to which an AC power source 6 is applied.
또한, 구현에 따라서, 입력전압 수신부에는 입력 교류 전원이나 입력 교류 전원을 정류한 입력 전원 상의 노이즈 제거, 서지 전압 차단, 전자기간섭 제거 등을 위한 적어도 하나의 보호회로가 구비될 수 있다.In some implementations, the input voltage receiver may include at least one protection circuit for removing noise on an input AC power source or an input power source rectifying the input AC power source, removing a surge voltage, and removing an electronic interference.
조광 제어부(12)는 조광레벨의 높고 낮음(고저)에 따라 LED 광원부의 발광구간의 길이를 조절하기 위한 조광신호를 생성하고, 생성한 조광신호를 LED 발광제어부(13)로 출력한다. 특히, 본 실시예에 따른 조광 제어부(12)는 입력 전압의 주기 전압이 최대값을 가지는 시점인 기준시점에서 구형파 신호를 생성하고 생성한 구형파 신호에 기초하여 LED 광원부(20)의 구동 및 조광을 제어함으로써 LED 광원부(20)의 발광다이오드 전체가 점등하는 것을 기본으로 하여 LED 광원부(20)의 광 출력을 제어한다.The dimming control unit 12 generates a dimming signal for adjusting the length of the light emitting section of the LED light source unit according to the high and low (high and low) of the dimming level, and outputs the generated dimming signal to the LED emission control unit 13. In particular, the dimming control unit 12 according to the present exemplary embodiment generates a square wave signal at a reference time point at which the periodic voltage of the input voltage has a maximum value, and drives and modulates the LED light source unit 20 based on the generated square wave signal. By controlling, the light output of the LED light source unit 20 is controlled on the basis that the entire light emitting diode of the LED light source unit 20 is turned on.
구현에 따라서, 조광 제어부(12)는 구형파 신호의 전연부(raising edge) 및 후연부(falling edge)가 조광레벨의 조광 점등시점 및 조광 소등시점에 각각 대응할 때, 조광레벨의 고저에 따라 구형파 신호의 폭이 기준시점을 기준으로 기준시점 양측에서 좌우 대칭적으로 연장되거나 축소되도록 조광신호를 생성할 수 있다.According to the implementation, the dimming control unit 12 is a square wave signal according to the height of the dimming level when the rising edge and the falling edge of the square wave signal respectively correspond to the dimming on time and dimming off time of the dimming level. The dimming signal may be generated such that the width of the light is extended or reduced symmetrically from both sides of the reference time point with respect to the reference time point.
또한, 구현에 따라서, 조광 제어부(12)는 구형파 신호의 전연부 및 후연부가 조광레벨의 조광 점등시점 및 조광 소등시점에 각각 대응할 때, 조광레벨의 고저에 따라 구형파 신호의 폭이 기준시점을 기준으로 기준시점 양측에서 서로 다른 폭으로 연장되거나 축소되도록 조광신호를 생성할 수 있다.In addition, according to the implementation, the dimming control unit 12, when the leading edge and the trailing edge of the square wave signal respectively correspond to the dimming lighting time and dimming off time of the dimming level, the width of the square wave signal based on the height of the dimming level is referred to As a result, dimming signals may be generated to extend or contract to different widths at both sides of the reference point.
전술한 실시예에 의하면, LED 광원부(20)의 조광 제어 시에 조광 제어부(12)는 LED 광원부(20)의 정격 입력 전압(구동 전압 등)에 대응하는 입력전압의 최대값에서 가장 낮은 레벨의 조광신호를 생성하므로, 조광레벨의 고저에 상관없이 LED 광원부(20)의 LED 전체가 점등하는 것을 기본으로 하여 LED 광원부(20)의 발광을 제어한다.According to the above-described embodiment, the dimming control unit 12 at the dimming control of the LED light source unit 20 is the lowest level at the maximum value of the input voltage corresponding to the rated input voltage (driving voltage, etc.) of the LED light source unit 20 Since the dimming signal is generated, the light emission of the LED light source unit 20 is controlled based on the lighting of the entire LED of the LED light source unit 20 regardless of the height of the dimming level.
전술한 조광신호는 예를 들어 조광 인터페이스(도 3의 17 참조)에서의 입력 신호(조광 기준신호 등)에 따라 미리 정해진 조광레벨을 지정하기 위한 신호일 수 있다. 그 경우, 조광 인터페이스에서의 입력 신호는 아날로그 또는 디지털 신호일 수 있으며, 또한 유선 또는 무선 신호일 수 있다. 이를 위해, 조광 제어부(12)는 아날로그 디지털 컨버터, 통신 인터페이스 등을 구비할 수 있으나, 이러한 신호 처리를 수행하는 아날로그 디지털 컨버터나 통신 인터페이스는 이미 잘 알려져 있으므로 그에 대한 상세설명은 생략한다.The above-described dimming signal may be, for example, a signal for designating a predetermined dimming level according to an input signal (dimming reference signal, etc.) at the dimming interface (see 17 in FIG. 3). In that case, the input signal at the dimming interface may be an analog or digital signal and may also be a wired or wireless signal. To this end, the dimming control unit 12 may include an analog-to-digital converter, a communication interface, and the like, but since the analog-to-digital converter or communication interface that performs such signal processing is well known, detailed description thereof will be omitted.
또한, 구현에 따라서, 조광신호는 조광 제어부(12)나 교류 LED 구동 및 조광 제어장치(10)에 탑재된 메모리 장치 등의 저장부(미도시)에 미리 저장된 조광데이터를 포함하는 신호일 수 있다. 조광데이터는 조명 시스템의 서로 다른 밝기를 지정하기 위한 복수의 조광레벨과 각 조광레벨에 대한 실행 조건(시간, 사람 감지 등)을 저장할 수 있다. 그 경우, 조광 제어부(12)는 기설정된 시간에 따라 저장부에 저장된 조광데이터를 읽어내고, 읽어낸 조광데이터에 포함된 조광레벨의 고저에 따라 특정 조광신호를 생성할 수 있다.In some embodiments, the dimming signal may be a signal including dimming data previously stored in a storage unit (not shown) such as a memory device mounted on the dimming controller 12 or the AC LED driving and dimming control device 10. The dimming data may store a plurality of dimming levels for specifying different brightness of the lighting system and execution conditions (time, person detection, etc.) for each dimming level. In this case, the dimming control unit 12 may read the dimming data stored in the storage unit according to a preset time, and generate a specific dimming signal according to the height of the dimming level included in the read dimming data.
LED 발광제어부(13)는 조광 제어부(12)로부터의 조광신호에 응답하여 구동제어신호를 LED 광원부(20)에 인가함으로써 조광레벨의 고저에 따라 LED 광원부(20)에 공급되는 입력전압(Vin), 입력전압에 따른 구동전압 및 구동전류 중 적어도 어느 하나를 제한하고, 이러한 제한에 의해 복수의 LED 그룹을 구비한 LED 광원부(20)의 구동 및 조광을 동시에 제어한다.The LED emission control unit 13 applies the driving control signal to the LED light source unit 20 in response to the dimming signal from the dimming control unit 12 to input the input voltage Vin supplied to the LED light source unit 20 according to the height of the dimming level. At least one of the driving voltage and the driving current according to the input voltage is limited, and the driving and dimming of the LED light source unit 20 having the plurality of LED groups are simultaneously controlled by this limitation.
본 실시예에서, LED 발광제어부(13)는 입력전압(Vin)의 크기가 증가함에 따라 발광하는 LED 그룹의 수가 증가하거나 입력전압(Vin)의 크기가 감소함에 따라 발광하는 LED 그룹의 수가 감소하도록 LED 광원부(20)의 구동 및 조광을 제어한다. 이러한 LED 발광제어부(13)는 조광신호에 기초하여 복수의 LED 그룹을 순차구동하기 위한 구동제어신호를 출력하는 PWM(Pulse Width Modulation) 컨트롤러를 구비할 수 있다. 복수의 LED 그룹에 대한 순차구동을 위한 구조나 방법은 미국등록특허 제7,081,722호 등에 자세히 기재되어 있으므로 그에 대한 상세설명은 생략한다.In the present embodiment, the LED light emission control unit 13 may increase the number of LED groups emitting light as the size of the input voltage Vin increases or decrease the number of LED groups emitting light as the size of the input voltage Vin decreases. The driving and dimming of the LED light source unit 20 is controlled. The LED emission control unit 13 may include a PWM (Pulse Width Modulation) controller for outputting a driving control signal for sequentially driving the plurality of LED groups based on the dimming signal. Structures or methods for sequential driving of a plurality of LED groups are described in detail in US Pat. No. 7,081,722 and the like, and thus detailed descriptions thereof will be omitted.
스위칭부(14)는 LED 발광제어부(13)로부터의 구동제어신호 인가에 따라 온 또는 오프 동작하는 반도체 스위치를 구비한다. 반도체 스위치는 n-채널 MOSFET 등으로 구현될 수 있다. 스위칭부(14)의 동작에 의해 LED 광원부(20)에 공급되는 구동 전압 및 구동 전류는 조광레벨의 고저에 따라 제한될 수 있다. 특히, 본 실시예에 따른 스위칭부(14)는 LED 광원부(20)의 복수의 LED 그룹을 순차구동하기 위해 각 LED 그룹의 캐소드 측에 연결되는 복수의 구동 스위치(도 1의 PS1, PS2, PSn 참조)를 구비할 수 있다.The switching unit 14 includes a semiconductor switch that is turned on or off in response to application of a drive control signal from the LED emission control unit 13. The semiconductor switch may be implemented with an n-channel MOSFET or the like. The driving voltage and the driving current supplied to the LED light source unit 20 by the operation of the switching unit 14 may be limited according to the height of the dimming level. In particular, the switching unit 14 according to the present embodiment includes a plurality of driving switches (PS 1 and PS 2 of FIG. 1) connected to the cathode side of each LED group to sequentially drive the plurality of LED groups of the LED light source unit 20. , PS n ).
보호회로부(15)는 LED 광원부(20)에 흐르는 전류와 저항기(R1) 양단의 전압을 검출하고 검출된 전류값 및 전압값에 기초하여 LED 전류가 제어되도록 함으로써 LED 광원부(20)의 발광을 일정하게 유지하고, 이상 전류로부터 LED 광원부(20)와 스위칭부(14)를 보호한다.The protection circuit unit 15 detects the current flowing through the LED light source unit 20 and the voltage across the resistor R1, and controls the LED current to be controlled based on the detected current value and the voltage value to uniformly emit light of the LED light source unit 20. The light source unit 20 and the switching unit 14 are protected from abnormal current.
본 실시예에서 저항기(R1)는 구동 스위치(Q1)와 뉴트럴(Neutral) 또는 그라운드(Ground)와의 사이에 직렬 연결된다. 구동 스위치가 MOSFET(Metal oxide semiconductor field effect transistor)로 형성되는 경우, 보호회로부(15)는 구동 스위치의 제2 단자(예컨대, n-채널 MOSFET의 소오스)와 저항기(R1)의 일측 단자에 공통 연결되어 구동 스위치(Q1)에 흐르는 LED 전류를 검출하고, 검출된 LED 전류값을 구동 제어부(124)에 인가하도록 구현할 수 있다.In the present embodiment, the resistor R1 is connected in series between the driving switch Q1 and neutral or ground. When the driving switch is formed of a metal oxide semiconductor field effect transistor (MOSFET), the protection circuit unit 15 is commonly connected to the second terminal of the driving switch (for example, the source of the n-channel MOSFET) and one terminal of the resistor R1. As a result, the LED current flowing through the driving switch Q1 may be detected, and the detected LED current value may be applied to the driving controller 124.
또한, 보호회로부(15)는 LED 광원부(20)의 정전류 구동을 위한 전류 싱크부로 구현될 수 있다. 그 경우, 보호회로부(15)는 연산 증폭기를 이용하여 구동 스위치의 제2 단자와 그라운드(또는 뉴트럴) 간의 전압, 즉 저항기(R1)의 양단에 걸리는 전압이 소정의 기준 전압(구동제어신호 등)과 동일하도록 LED 전류를 정전류 제어할 수 있다.In addition, the protection circuit unit 15 may be implemented as a current sink for driving a constant current of the LED light source unit 20. In this case, the protection circuit unit 15 uses an operational amplifier to supply a voltage between the second terminal of the drive switch and the ground (or neutral), that is, the voltage across the resistor R1, to a predetermined reference voltage (drive control signal, etc.). Constant current control of the LED current is equal to
또한, 교류 LED 구동 및 조광 제어장치(10)는 제어전원 공급부(17) 등을 더 구비할 수 있다. 제어전원 공급부(17)는 정류부(16)의 출력단에 직렬 연결되어 교류 LED 구동 및 조광 제어장치(10)에 필요한 내부 전원을 공급하거나 동기 신호를 생성하여 조광제어부(12)나 LED 발광제어부(13)에 공급하도록 구현될 수 있다. 이러한 제어전원 공급부(17)에 대하여는 본 기술분야에 이미 잘 알려져 있으므로 그에 대한 상세설명은 생략한다.In addition, the AC LED driving and dimming control device 10 may further include a control power supply unit 17 and the like. The control power supply 17 is connected in series to the output terminal of the rectifier 16 to supply the internal power required for the AC LED drive and the dimming control device 10 or to generate a synchronization signal to control the dimming control unit 12 or the LED emission control unit 13. Can be implemented. Such a control power supply 17 is already well known in the art, so a detailed description thereof will be omitted.
LED 광원부(20)는 복수의 발광다이오드와 입력전압에 대응하는 정격 구동전압을 구비한다. LED 광원부(20)는 서로 직렬 또는 직-병렬 연결되는 복수의 LED 패키지나 LED 스트링을 구비할 수 있다. 또한, LED 광원부(20)는 LED 어레이 등으로 불릴 수 있다.The LED light source unit 20 includes a plurality of light emitting diodes and a rated driving voltage corresponding to the input voltage. The LED light source unit 20 may include a plurality of LED packages or LED strings connected in series or in parallel with each other. In addition, the LED light source unit 20 may be referred to as an LED array.
도 6은 도 5의 교류 LED 구동 및 조광 제어장치의 조광 제어부의 개략적인 블록도이다.FIG. 6 is a schematic block diagram of a dimming control unit of the AC LED driving and dimming control device of FIG. 5.
도 6을 참조하면, 본 실시예에 따른 조광 제어부(12)는 영점 검출부(121), 위상 검출부(122) 및 조광신호 생성부(123)를 구비한다.Referring to FIG. 6, the dimming controller 12 according to the present embodiment includes a zero point detector 121, a phase detector 122, and a dimming signal generator 123.
영점 검출부(121)는 입력전압(Vin)의 영점 또는 영전위를 검출한다. 영점 검출부(Zero crossing detector, 121)는 입력전압이 0V인 시점을 검출한다. 본 실시예에서 영점 검출부(121)는 사인파(Sin wave) 형태의 교류 입력 전압을 전파 정류한 입력전압의 성분 값이 영인 위상(또는 그 시점)을 검출하는 수단이나 이에 상응하는 기능을 수행하는 구성부로 구현된다.The zero point detector 121 detects a zero point or zero potential of the input voltage Vin. The zero crossing detector 121 detects a time point at which the input voltage is 0V. In the present embodiment, the zero detection unit 121 is a means for detecting a phase (or a time point) at which a component value of an input voltage obtained by full-wave rectifying an AC input voltage having a sine wave form or performing a function corresponding thereto. Implemented as negative.
위상 검출부(122)는 영점 검출부(121)로부터의 영점 검출 신호에 기초하여 입력전압이 최대값을 나타내는 시점인 기준시점을 검출한다. 영점 검출 신호는 입력전압의 영점 또는 영전위에 대한 위상이나 시점 정보를 포함하는 신호이다. 기준시점은 서로 인접한 두 영점 또는 두 영점에 대한 두 시점들 사이의 중간 시점을 계산하는 방식으로 검출될 수 있다.The phase detector 122 detects a reference time point that is a time point at which the input voltage exhibits a maximum value based on the zero point detection signal from the zero point detector 121. The zero detection signal is a signal including phase or viewpoint information on the zero or zero potential of the input voltage. The reference time point may be detected by calculating an intermediate time point between two adjacent zero points or two time points for the two zero points.
또한, 위상 검출부(122)는 교류 LED 구동 및 위상 제어장치에서 출력되고 있는 현재의 펄스 신호를 판단한다. 펄스 신호(동기 신호 등)는 제어전압 공급부(16)에서 생성되어 교류 LED 구동 및 위상 제어장치에 공급될 수 있다.In addition, the phase detector 122 determines a current pulse signal output from the AC LED driving and phase control apparatus. The pulse signal (synchronization signal, etc.) may be generated by the control voltage supply unit 16 and supplied to the AC LED drive and phase control device.
조광신호 생성부(123)는 위상 검출부(122)로부터의 기준시점과 조광 인터페이스(17)로부터의 조광 기준신호에 기초하여 구형파 펄스를 발생시킨다. 본 실시예에서 조광신호 생성부(123)는 입력전압이 최대값을 가지는 기준시점을 기준으로 하여 구형파 펄스의 전연부(raising edge)와 후연부(falling edge)를 기준시점 양측으로 일정 폭만큼 연장한 조광신호를 생성하고, 생성된 조광신호를 LED 발광제어부로 출력한다.The dimming signal generator 123 generates a square wave pulse based on the reference time point from the phase detector 122 and the dimming reference signal from the dimming interface 17. In the present exemplary embodiment, the dimming signal generator 123 extends the rising edge and the falling edge of the square wave pulse to both sides of the reference point by a predetermined width based on the reference point having the maximum input voltage. A dimming signal is generated, and the generated dimming signal is output to the LED emission controller.
또한, 구현에 따라서, 조광신호 생성부(123)는 입력전압으로부터 동기신호를 출력하고, 출력된 동기신호를 이용하여 소정 주기의 클럭 신호를 출력하고, 클럭 신호를 카운트하여 2진 데이터(카운트 클럭수에 대응)를 출력하고, 카운트 클럭수에 따라 오실레이터의 동작 주파수를 제어하도록 구현될 수 있다. 그리고, 조광신호 생성부(123)는 카운트 클럭수를 이용하여 구형파 신호(조광신호에 대응)의 인에이블 구간(발광구간에 대응)을 판단하고, 판단된 인에이블 구간 동안 LED 발광제어부에서 구동제어신호가 출력되도록 구현될 수 있다. 구동제어신호는 스위칭부(14)의 구동 스위치의 제어 단자나 보호회로부(15)의 연산 증폭기에 인가될 수 있다.Further, according to the implementation, the dimming signal generator 123 outputs a synchronous signal from an input voltage, outputs a clock signal of a predetermined period using the output synchronous signal, counts a clock signal, and counts binary data (count clock). Number) and control the operating frequency of the oscillator according to the count clock number. The dimming signal generating unit 123 determines the enable period (corresponding to the light emitting period) of the square wave signal (corresponding to the dimming signal) using the count clock number, and controls the driving of the LED light emitting controller during the determined enable period. It can be implemented to output a signal. The driving control signal may be applied to the control terminal of the driving switch of the switching unit 14 or the operational amplifier of the protection circuit unit 15.
또한, 구현에 따라서 전술한 조광신호 생성부(123)는 LED 발광제어부(도 5의 13 참조)와 함께 위상 시프트 PWM 제어기(130)로 구현될 수 있다.In addition, according to the implementation, the above-described dimming signal generator 123 may be implemented as the phase shift PWM controller 130 together with the LED emission controller (see 13 of FIG. 5).
본 발명의 실시예에 따른 교류 LED 구동 및 조광 제어장치는 구현에 따라서 조광 인터페이스(18)를 구비할 수 있다. 그 경우, 조광 인터페이스(18)는 LED 광원부(20)의 조도를 조절하기 위한 사용자 장치(조광기)에 대응하는 것으로 사용자 입력에 따라 그 출력 값이 변하는 아날로그, 디지털 또는 이들의 조합 형태를 구비할 수 있다. 조광 인터페이스(18)는 LED 광원부(20)의 광 출력 제어를 위해 다이얼 방식, 버튼 방식, 터치 방식 등의 조광기 구조를 구비할 수 있다.AC LED driving and dimming control apparatus according to an embodiment of the present invention may have a dimming interface 18 depending on the implementation. In this case, the dimming interface 18 corresponds to a user device (dimmer) for adjusting the illuminance of the LED light source unit 20 and may have an analog, digital, or a combination thereof in which an output value thereof changes according to a user input. have. The dimming interface 18 may include a dimmer structure such as a dial method, a button method, and a touch method for controlling the light output of the LED light source unit 20.
또한, 조광 인터페이스(18)는 기존의 다양한 구조를 이용하여 구현하는 것이 가능한데, 예를 들어, 저항기를 포함한 부하; 저항기 및 캐패시터를 포함한 부하; 저항기 및 인덕터를 포함한 부하; 및 저항기, 캐패시터 및 인덕터를 포함한 부하 중 적어도 어느 하나에 대응하도록 구현될 수 있다.In addition, the dimming interface 18 can be implemented using various existing structures, for example, a load including a resistor; Loads including resistors and capacitors; Loads including resistors and inductors; And a load including a resistor, a capacitor, and an inductor.
또한, 조광 인터페이스(18)는 교류 LED 구동 및 조광 제어장치의 외부에 노출되도록 설치되거나 교류 LED 구동 및 조광 제어장치와는 독립적인 별도의 장치로 설치될 수 있다. 예를 들어, 조광 인터페이스(18)는 LED 광원부(20)와 교류 LED 구동 및 조광 제어장치를 포함한 LED 모듈이나 LED 램프에 결합하는 조광기로 구현될 수 있다. 이러한 조광 인터페이스(17)는 LED 램프의 하우징에 LED 램프와 함께 일체로 설치되거나 구현에 따라서 LED 램프의 종류나 구조에 상관없이 건물 벽 등의 다양한 위치에 분리되어 설치될 수 있다.In addition, the dimming interface 18 may be installed to be exposed to the outside of the AC LED driving and dimming control device or may be installed as a separate device independent of the AC LED driving and dimming control device. For example, the dimming interface 18 may be implemented as a dimmer coupled to an LED module or LED lamp including the LED light source unit 20 and the AC LED driving and dimming control device. The dimming interface 17 may be installed integrally with the LED lamp in the housing of the LED lamp or may be separately installed at various locations such as a building wall regardless of the type or structure of the LED lamp, depending on the implementation.
도 7은 본 발명의 실시예에 따른 교류 LED 구동 및 조광 제어방법의 순서도이다.7 is a flow chart of the AC LED driving and dimming control method according to an embodiment of the present invention.
도 7을 참조하면, 본 실시예에 따른 교류 LED 구동 및 조광 제어방법은 우선 시간에 따라 주기적으로 전압의 크기가 변동하는 입력전압을 수신한다(S71). 입력전압은 입력 교류 전압을 정류한 전압인 것이 바람직하다.Referring to FIG. 7, the AC LED driving and dimming control method according to the present embodiment first receives an input voltage whose voltage varies periodically depending on time (S71). The input voltage is preferably a voltage obtained by rectifying the input AC voltage.
*다음, 입력전압이 최대값을 가지는 시점인 기준시점에서 구형파 펄스를 생성한다(S72). 기준시점에서 구형파 펄스를 생성하는 것은 기준시점에 구형파 펄스의 폭 중앙이 위치하도록 구형파 펄스를 생성하는 것이 바람직하다. 하지만, 본 발명은 그러한 구성으로 한정되지 않고, 기준시점에 구형파 펄스의 전연부(raising edge)가 위치하도록 구형파 펄스를 생성하는 것이나, 기준시점에 구형파 펄스의 후연부(falling edge)가 위치하도록 구형파 펄스를 생성하는 것을 포함할 수 있다.Next, a square wave pulse is generated at the reference time point at which the input voltage has the maximum value (S72). Generating the square wave pulse at the reference time is preferably to generate the square wave pulse so that the center of the width of the square wave pulse is located at the reference time. However, the present invention is not limited to such a configuration, and generates a square wave pulse so that the rising edge of the square wave pulse is located at the reference time point, or the square wave is positioned so that the falling edge of the square wave pulse is located at the reference time point. Generating pulses.
다음, 기준시점 양측에서 구형파 신호의 전연부와 후연부의 위치를 조정함으로써 조광레벨의 고저에 따라 구형파 신호의 폭이 연장되거나 축소된 조광신호를 생성한다(S73). 구형파 신호의 전연부와 후연부의 위치를 조정하는 것은 기준시점에서 생성한 구형파 신호에서 조광레벨의 고저에 따라 미리 설정된 폭만큼 구형파 신호의 전연부 및/또는 후연부의 위치를 기준시점 양측에서 연장하거나 축소하는 것에 대응한다. 조광신호는 복수의 LED(Light emitting diode) 그룹을 구비한 LED 광원부가 발광하는 시간인 발광구간의 길이를 조절하기 위한 신호에 대응할 수 있다.Next, by adjusting the positions of the leading edge and the trailing edge of the square wave signal at both sides of the reference time point, the dimming signal having an extended or reduced width of the square wave signal is generated according to the height of the dimming level (S73). Adjusting the position of the leading edge and the trailing edge of the square wave signal extends the positions of the leading edge and / or trailing edge of the square wave signal from both sides of the reference point by a predetermined width according to the height of the dimming level in the square wave signal generated at the reference point. Responds to shrinking. The dimming signal may correspond to a signal for adjusting a length of a light emitting section, which is a time at which an LED light source unit having a plurality of light emitting diode (LED) groups emits light.
다음, 조광신호에 기초하여 상기 입력전압, 상기 입력전압에 따른 구동전압 및 구동전류 중 적어도 어느 하나를 제한하기 위한 구동제어신호를 LED 광원부에 인가함으로써 조광레벨 하에서 입력전압의 크기가 증가함에 따라 발광하는 LED 그룹의 수가 증가하거나 입력전압의 크기가 감소함에 따라 발광하는 LED 그룹의 수가 감소하도록 LED 광원부의 구동 및 조광을 제어한다(S74).Next, a driving control signal for limiting at least one of the input voltage, the driving voltage according to the input voltage, and the driving current based on the dimming signal is applied to the LED light source unit to emit light as the magnitude of the input voltage increases under the dimming level. As the number of LED groups increases or the size of the input voltage decreases, driving and dimming of the LED light source unit is controlled to reduce the number of LED groups emitting light (S74).
본 실시예에 의하면, LED 광원부의 복수의 LED 그룹을 순차구동 방식으로 구동제어하면서 LED 그룹 전체의 발광을 기본으로 하여 LED 광원부의 조광을 제어할 수 있다.According to the present embodiment, it is possible to control the dimming of the LED light source unit based on the light emission of the entire LED group while driving control of the plurality of LED groups of the LED light source unit in a sequential driving manner.
도 8 내지 도 12는 도 7의 교류 LED 구동 및 조광 제어방법을 조광레벨에 따라 나타낸 도면들이다.8 to 12 are views illustrating the AC LED driving and dimming control method of FIG. 7 according to dimming levels.
도 8 내지 도 12는 교류 LED 광원부를 가장 낮은 광 출력으로 제어하기 위한 제1 조광레벨에서부터 가장 높은 광 출력으로 제어하기 위한 제5 조광레벨까지의 각 구동 및 조광 제어 과정과 해당 광 출력을 도시한다.8 to 12 show the respective driving and dimming control processes and corresponding light outputs from the first dimming level for controlling the AC LED light source to the lowest light output to the fifth dimming level for controlling the highest light output. .
이하의 실시예에서 설명의 편의를 위해 서로 직렬 연결된 4개의 발광다이오드를 구비한 교류 LED 광원부를 포함하고, 4개의 발광다이오드를 순차구동하는 LED 조명 시스템을 가정하여 설명한다. 도시의 편의상 각 발광다이오드의 캐소드에 연결되는 구동 스위치(도 1의 PS1, PS2,……, PSn 참조)는 생략한다.In the following embodiments, for convenience of description, it is assumed that an LED lighting system including an AC LED light source unit having four light emitting diodes connected in series with each other and sequentially driving four light emitting diodes will be described. For convenience of illustration, a driving switch (see PS 1 , PS 2 ,..., PS n in FIG. 1) connected to the cathode of each light emitting diode is omitted.
우선, 도 8을 참조하면, 조광레벨이 기설정 레벨 중 가장 낮은 광 출력(제1 광 출력)에 해당하는 제1 조광레벨일 때, 교류 LED 구동 및 조광 제어장치는 입력전압(Vin)이 최대값을 가지는 시점인 기준시점(t0)에서 구형파 신호를 생성하고 생성된 구형파 신호에 기초하여 LED 광원부를 구동 및 조광 제어한다. 여기서, 구형파 신호는 그대로 조광신호(RS1)로 이용될 수 있다. 또한, 구현에 따라서, 구형파 신호는 미리 설정된 폭만큼 그 폭이 연장되거나 축소된 조광신호(RS1)를 생성하는데 이용될 수 있다.First, referring to FIG. 8, when the dimming level is the first dimming level corresponding to the lowest light output (first light output) among the preset levels, the AC LED driving and dimming control device has a maximum input voltage Vin. A square wave signal is generated at the reference time point t0, which is a time point having a value, and the LED light source unit is driven and dimmed based on the generated square wave signal. Here, the square wave signal may be used as the dimming signal RS1. Further, depending on the implementation, the square wave signal may be used to generate the dimming signal RS1 whose length is extended or reduced by a predetermined width.
본 실시예에서 조광신호(RS1)에 기초한 구동제어신호가 LED 광원부의 제4 구동 스위치에 인가되면, 입력전압(Vin)에 따른 구동 전압 및 구동 전류(ILED)가 입력 주기 전압의 특정 서브 구간(t1~t2) 동안 LED 광원부에 공급되고, 특정 서브 구간 동안 제1 내지 제4 LED(D1, D2, D3, D4) 전체가 실질적으로 동시에 점등한다.In the present embodiment, when the driving control signal based on the dimming signal RS1 is applied to the fourth driving switch of the LED light source unit, the driving voltage and the driving current I LED according to the input voltage Vin are specified in the sub-section of the input periodic voltage. It is supplied to the LED light source unit during t1 to t2, and the entire first to fourth LEDs D1, D2, D3, and D4 are turned on substantially simultaneously during the specific sub-section.
특정 서브 구간은 제1 서브 구간(SP1)에 대응하고, 또한 구형파 신호 또는 조광 신호(RS1)의 폭 구간에 대응한다. 제4 구동 스위치는 제4 발광다이오드의 캐소드에 제1 단자(n-채널 MOSFET의 드레인 등)가 연결된 구동 스위치에 대응할 수 있다.The specific sub section corresponds to the first sub section SP1 and also corresponds to the width section of the square wave signal or the dimming signal RS1. The fourth driving switch may correspond to a driving switch in which a first terminal (eg, a drain of the n-channel MOSFET) is connected to the cathode of the fourth light emitting diode.
다음, 도 9를 참조하면, 조광 인터페이스에서의 조광레벨이 제1 광 출력보다 큰 제2 광 출력을 가지는 제2 조광레벨일 때, 교류 LED 구동 및 조광 제어장치는 입력전압(Vin)이 최대값을 가지는 시점인 기준시점(t0)에서 구형파 신호를 생성하고 생성된 구형파 신호의 전연부와 후연부를 기준시점 양측에서 좌우 대칭적으로 연장하거나 축소하여 조광신호(RS2)를 생성한다. 본 실시예의 조광신호(RS2)는, 도 8의 조광신호(RS1)보다 연장된 폭을 구비하고, 이하에서 설명할 도 10의 조광신호(RS3)보다 축소된 폭을 구비한다.Next, referring to FIG. 9, when the dimming level at the dimming interface is a second dimming level having a second light output larger than the first light output, the AC LED driving and dimming control device has a maximum input voltage Vin. The square wave signal is generated at the reference time point t0, and the front and rear edges of the generated square wave signal are symmetrically extended or reduced from both sides of the reference time point to generate the dimming signal RS2. The dimming signal RS2 of this embodiment has a width extending from the dimming signal RS1 of FIG. 8 and a width smaller than the dimming signal RS3 of FIG. 10 to be described below.
본 실시예에 있어서, 생성되는 구형파 신호는 기준시점이 구형파 신호의 폭을 양분하도록 구형파 신호의 중앙에 위치하는 것이 바람직하지만, 본 발명은 그러한 구성으로 한정되지 않고, 구형파 신호의 전연부 또는 후연부가 기준시점에 위치하도록 생성될 수 있다.In the present embodiment, the generated square wave signal is preferably located at the center of the square wave signal so that the reference point divides the width of the square wave signal, but the present invention is not limited to such a configuration, and the leading edge or trailing edge of the square wave signal is It may be generated to be located at the reference point.
교류 LED 구동 및 조광 제어장치는 조광신호(RS2)에 기초한 구동제어신호를 특정 서브 구간(t3~t4) 동안 LED 광원부의 구동 스위치에 인가한다. 본 실시예에서 LED 발광제어부는 조광신호(SP2)에 기초하여 제1 서브 구간(SP2)에서 제3 구동 스위치를 턴-온하고, 제2 서브 구간(SP1)에서 제4 구동 스위치를 턴-온하고, 제3 서브 구간(SP3)에서 제3 구동 스위치를 턴-온한다. 여기서, 제1 및 제3 서브 구간에서 제1, 제2 및 제4 구동 스위치는 턴-오프 상태를 가지고, 제2 서브 구간에서 제1, 제2 및 제3 구동 스위치는 턴-오프 상태를 가진다. 제2 서브 구간은 도 8에서의 제1 서브 구간에 대응한다.The AC LED driving and dimming control device applies a driving control signal based on the dimming signal RS2 to the driving switch of the LED light source unit during the specific sub period t3 to t4. In the present embodiment, the LED emission controller turns on the third driving switch in the first sub-section SP2 based on the dimming signal SP2 and turns on the fourth driving switch in the second sub-section SP1. In operation S3, the third driving switch is turned on. Here, the first, second and fourth drive switches have a turn-off state in the first and third sub-sections, and the first, second and third drive switches have a turn-off state in the second sub-sections. . The second sub period corresponds to the first sub period in FIG. 8.
본 실시예에 의하면, 조광신호(RS2)에 기초한 구동제어신호가 입력전압(Vin)에 따라 LED 광원부의 제3 및 제4 구동 스위치에 선택적으로 인가되면, 입력전압(Vin)에 따른 구동 전압 및 구동 전류(ILED)가 입력 주기 전압의 서브 구간(t3~t4) 동안 LED 광원부에 공급된다. 즉, 제3 및 제4 구동 스위치의 동작에 따라 LED 광원부에 구동 전류가 공급되면, 제1 서브 구간(SP2)에서 제1 내지 제3 LED(D1, D2, D3)가 점등하고, 제2 서브 구간(SP1)에서 제1 내지 제4 LED(D1, D2, D3, D4) 전체가 점등하고, 제3 서브 구간(SP3)에서 제1 내지 제3 LED(D1, D2, D3)가 점등한다. 여기서, 제1 서브 구간과 제3 서브 구간 각각은 제2 서브 구간의 절반(1/2)의 구간에 해당한다.According to the present exemplary embodiment, when the driving control signal based on the dimming signal RS2 is selectively applied to the third and fourth driving switches of the LED light source unit according to the input voltage Vin, the driving voltage according to the input voltage Vin and The driving current I LED is supplied to the LED light source unit during the sub period t3 to t4 of the input periodic voltage. That is, when the driving current is supplied to the LED light source unit according to the operation of the third and fourth driving switches, the first to third LEDs D1, D2, and D3 are turned on in the first sub-section SP2, and the second sub The entire first to fourth LEDs D1, D2, D3, and D4 are turned on in the section SP1, and the first to third LEDs D1, D2, and D3 are turned on in the third sub section SP3. Here, each of the first sub-section and the third sub-section corresponds to a half (1/2) of the second sub-section.
본 실시예에 따른 교류 LED 구동 및 조광 제어장치는, 도 8의 제1 조광레벨에서 단위 시간당 점등된 발광다이오드의 개수가 4개인 광 출력을 가진다고 할 때, 제2 조광레벨에서 단위 시간당 점등된 발광다이오드의 개수가 7개인 광 출력을 가진다.The AC LED driving and dimming control apparatus according to the present embodiment has a light output of four light emitting diodes lit per unit time at the first dimming level of FIG. 8, and emits light per unit time at the second dimming level. It has a light output of seven diodes.
다음, 도 10을 참조하면, 조광 인터페이스에서의 조광레벨이 제2 광 출력보다 큰 제3 광 출력을 가지는 제3 조광레벨일 때, 교류 LED 구동 및 조광 제어장치는 입력전압(Vin)이 최대값을 가지는 시점인 기준시점(t0)에서 구형파 신호를 생성하고 생성된 구형파 신호의 전연부와 후연부를 기준시점 양측에서 좌우 대칭되도록 조정하여 조광신호(RS3)를 생성한다.Next, referring to FIG. 10, when the dimming level at the dimming interface is a third dimming level having a third light output larger than the second light output, the AC LED driving and dimming control device has a maximum input voltage Vin. A square wave signal is generated at the reference time point t0, and the front and rear edges of the generated square wave signal are symmetrically symmetrical from both sides of the reference time point to generate the dimming signal RS3.
교류 LED 구동 및 조광 제어장치는 조광신호(RS3)에 기초한 구동제어신호를 특정 서브 구간(t5~t6) 동안 LED 광원부의 구동 스위치에 인가한다. 본 실시예에서 LED 발광제어부는 조광신호(RS3)에 기초하여 제1 서브 구간(SP2)에서 제3 구동 스위치를 턴-온하고, 제2 서브 구간(SP1)에서 제4 구동 스위치를 턴-온하고, 제3 서브 구간(SP3)에서 제3 구동 스위치를 턴-온한다. 여기서, 제1 및 제3 서브 구간에서 제1, 제2 및 제4 구동 스위치는 턴-오프 상태를 가지고, 제2 서브 구간에서 제1, 제2 및 제3 구동 스위치는 턴-오프 상태를 가진다.The AC LED driving and dimming control device applies a driving control signal based on the dimming signal RS3 to the driving switch of the LED light source unit during the specific sub period t5 to t6. In the present exemplary embodiment, the LED emission controller turns on the third driving switch in the first sub-section SP2 based on the dimming signal RS3 and turns on the fourth driving switch in the second sub-section SP1. In operation S3, the third driving switch is turned on. Here, the first, second and fourth drive switches have a turn-off state in the first and third sub-sections, and the first, second and third drive switches have a turn-off state in the second sub-sections. .
본 실시예에 의하면, 조광신호(RS3)에 기초한 구동제어신호가 입력전압(Vin)에 따라 LED 광원부의 제3 및 제4 구동 스위치에 선택적으로 인가될 때, 입력전압(Vin)에 따른 구동 전압 및 구동 전류(ILED)가 입력 주기 전압의 특정 서브 구간(t5~t6)에서 LED 광원부에 공급된다. 제3 및 제4 구동 스위치의 순차 동작에 따라 LED 광원부에 구동 전류가 공급되면, 제1 서브 구간(SP2)에서 제1 내지 제3 LED(D1, D2, D3)가 점등하고, 제2 서브 구간(SP1)에서 제1 내지 제4 LED(D1, D2, D3, D4) 전체가 점등하고, 제3 서브 구간(SP3)에서 제1 내지 제3 LED(D1, D2, D3)가 점등한다. 여기서, 제1 내지 제3 서브 구간의 길이는 실질적으로 동일할 수 있다.According to the present embodiment, when the driving control signal based on the dimming signal RS3 is selectively applied to the third and fourth driving switches of the LED light source unit according to the input voltage Vin, the driving voltage according to the input voltage Vin. And a driving current I LED is supplied to the LED light source in a specific sub period t5 to t6 of the input period voltage. When driving current is supplied to the LED light source unit according to the sequential operation of the third and fourth driving switches, the first to third LEDs D1, D2, and D3 are turned on in the first sub-section SP2, and the second sub-section is turned on. The entire first to fourth LEDs D1, D2, D3, and D4 are lit at SP1, and the first to third LEDs D1, D2, D3 are lit at the third sub-section SP3. Here, the lengths of the first to third sub-sections may be substantially the same.
본 실시예에 따른 교류 LED 구동 및 조광 제어장치는, 도 8의 제1 조광레벨에서 단위 시간당 점등된 발광다이오드의 개수가 4개인 광 출력을 가진다고 할 때, 제3 조광레벨에서 단위 시간당 점등된 발광다이오드의 개수가 10개인 광 출력을 가진다.The alternating current LED driving and dimming control apparatus according to the present embodiment has a light output of four light emitting diodes lit per unit time at the first dimming level of FIG. 8, and emits light per unit time at the third dimming level. It has a light output of 10 diodes.
다음, 도 11을 참조하면, 조광레벨이 제3 광 출력보다 큰 제4 광 출력을 가지는 제4 조광레벨일 때, 교류 LED 구동 및 조광 제어장치는 입력전압(Vin)이 최대값을 가지는 시점인 기준시점(t0)에서 구형파 신호를 생성하고 생성된 구형파 신호의 전연부와 후연부를 기준시점 양측에서 기준시점을 기준으로 좌우 대칭되도록 조정하여 조광신호(RS4)를 생성한다.Next, referring to FIG. 11, when the dimming level is a fourth dimming level having a fourth light output larger than the third light output, the AC LED driving and dimming control device is a point in time at which the input voltage Vin has a maximum value. A square wave signal is generated at the reference time point t0, and the front and rear edges of the generated square wave signal are adjusted to be symmetrical with respect to the reference point at both sides of the reference point to generate the dimming signal RS4.
교류 LED 구동 및 조광 제어장치는 조광신호(RS4)에 기초한 구동제어신호를 특정 서브 구간(t7~t8) 동안 LED 광원부의 구동 스위치에 인가한다. 즉, LED 발광제어부는 조광신호(RS4)에 기초한 PWM 구동제어신호를 통해 제1 서브 구간(SP4)에서 제2 구동 스위치를 턴-온하고, 제2 서브 구간(SP2)에서 제3 구동 스위치를 턴-온하고, 제3 서브 구간(SP1)에서 제4 구동 스위치를 턴-온하고, 제4 서브 구간(SP3)에서 제3 구동 스위치를 턴-온하고, 제5 서브 구간(SP5)에서 제2 구동 스위치를 턴-온한다. 이때, 제1 및 제5 서브 구간에서 제1, 제3 및 제4 구동 스위치는 턴-오프 상태를 가지고, 제2 및 제4 서브 구간에서 제1, 제2 및 제4 구동 스위치는 턴-오프 상태를 가지며, 제3 서브 구간에서 제1, 제2 및 제3 구동 스위치는 턴-오프 상태를 가진다.The AC LED driving and dimming control device applies a driving control signal based on the dimming signal RS4 to the driving switch of the LED light source unit during the specific sub period t7 to t8. That is, the LED light emission controller turns on the second driving switch in the first sub-section SP4 through the PWM driving control signal based on the dimming signal RS4 and turns on the third driving switch in the second sub-section SP2. Turn on, turn on the fourth drive switch in the third sub-section SP1, turn on the third drive switch in the fourth sub-section SP3, and turn on the fourth drive switch in the fifth sub-section SP5. 2 Turn the drive switch on. In this case, the first, third and fourth driving switches have a turn-off state in the first and fifth sub-sections, and the first, second and fourth driving switches are turned off in the second and fourth sub-sections. Has a state, and in the third sub-section, the first, second and third driving switches have a turn-off state.
본 실시예에 의하면, 조광신호(RS4)에 기초한 구동제어신호가 입력전압(Vin)에 따라 LED 광원부의 제2, 제3 및 제4 구동 스위치에 선택적으로 인가될 때, 입력전압(Vin)에 따른 구동 전압 및 구동 전류(ILED)가 입력 주기 전압의 특정 서브 구간(t7~t8)에서 LED 광원부에 공급된다. 즉, 제2, 제3 및 제4 구동 스위치의 순차 구동에 따라 LED 광원부에 구동 전류가 공급되면, 제1 서브 구간(SP4)에서 제1 및 제2 LED(D1, D2)가 점등하고, 제2 서브 구간(SP2)에서 제1 내지 제3 LED(D1, D2, D3)가 점등하고, 제3 서브 구간(SP1)에서 제1 내지 제4 LED(D1, D2, D3, D4)가 점등하고, 제4 서브 구간(SP3)에서 제1 내지 제3 LED(D1, D2, D3)가 점등하고, 제5 서브 구간(SP5)에서 제1 및 제2 LED(D1, D2)가 점등한다. 여기서, 제2 내지 제4 서브 구간의 길이는 실질적으로 동일하고, 제1 및 제5 서브 구간의 길이는 제3 서브 구간의 절반에 해당할 수 있다.According to the present embodiment, when the driving control signal based on the dimming signal RS4 is selectively applied to the second, third and fourth driving switches of the LED light source unit according to the input voltage Vin, the driving voltage is applied to the input voltage Vin. According to the driving voltage and the driving current (I LED ) is supplied to the LED light source in a specific sub period (t7 ~ t8) of the input period voltage. That is, when the driving current is supplied to the LED light source unit according to the sequential driving of the second, third and fourth driving switches, the first and second LEDs D1 and D2 are turned on in the first sub-section SP4, and The first to third LEDs D1, D2, and D3 are turned on in the second sub period SP2, and the first to fourth LEDs D1, D2, D3, and D4 are turned on in the third sub period SP1. The first to third LEDs D1, D2, and D3 light up in the fourth sub period SP3, and the first and second LEDs D1 and D2 light up in the fifth sub period SP5. Here, the lengths of the second to fourth sub-sections may be substantially the same, and the lengths of the first and fifth sub-sections may correspond to half of the third sub-sections.
본 실시예에 따른 교류 LED 구동 및 조광 제어장치는, 도 8의 제1 조광레벨에서 단위 시간당 점등된 발광다이오드의 개수가 4개인 광 출력을 가진다고 할 때, 제4 조광레벨에서 단위 시간당 점등된 발광다이오드의 개수가 12개인 광 출력을 가진다.The alternating current LED driving and dimming control apparatus according to the present embodiment has a light output of four light emitting diodes lit per unit time at the first dimming level of FIG. 8, and emits light per unit time at the fourth dimming level. It has a light output of 12 diodes.
다음, 도 12를 참조하면, 조광레벨이 제4 광 출력보다 큰 제5 광 출력을 가지는 제5 조광레벨일 때, 교류 LED 구동 및 조광 제어장치는 입력전압(Vin)이 최대값을 가지는 시점인 기준시점(t0)에서 구형파 신호를 생성하고 생성된 구형파 신호의 전연부와 후연부를 기준시점 양측에서 기준시점을 기준으로 좌우 대칭되도록 조정하여 조광신호(RS5)를 생성한다.Next, referring to FIG. 12, when the dimming level is a fifth dimming level having a fifth light output greater than the fourth light output, the AC LED driving and dimming control device is a point in time at which the input voltage Vin has a maximum value. The square wave signal is generated at the reference time point t0, and the dimming signal RS5 is generated by adjusting the leading edge and the trailing edge of the generated square wave signal on both sides of the reference time to be symmetrical with respect to the reference time point.
교류 LED 구동 및 조광 제어장치는 조광신호(RS5)에 기초한 구동제어신호를 특정 서브 구간(t9~t10) 동안 LED 광원부의 구동 스위치에 인가한다. 즉, LED 발광제어부는 조광신호(RS5)에 기초한 PWM 구동제어신호를 통해 제1 서브 구간(SP4)에서 제2 구동 스위치를 턴-온하고, 제2 서브 구간(SP2)에서 제3 구동 스위치를 턴-온하고, 제3 서브 구간(SP1)에서 제4 구동 스위치를 턴-온하고, 제4 서브 구간(SP3)에서 제3 구동 스위치를 턴-온하고, 제5 서브 구간(SP5)에서 제2 구동 스위치를 턴-온한다. 이때, 제1 및 제5 서브 구간에서 제1, 제3 및 제4 구동 스위치는 턴-오프 상태를 가지고, 제2 및 제4 서브 구간에서 제1, 제2 및 제4 구동 스위치는 턴-오프 상태를 가지며, 제3 서브 구간에서 제1, 제2 및 제3 구동 스위치는 턴-오프 상태를 가진다.The AC LED driving and dimming control device applies a driving control signal based on the dimming signal RS5 to the driving switch of the LED light source unit during the specific sub period t9 to t10. That is, the LED emission controller turns on the second driving switch in the first sub-section SP4 through the PWM driving control signal based on the dimming signal RS5 and turns on the third driving switch in the second sub-section SP2. Turn on, turn on the fourth drive switch in the third sub-section SP1, turn on the third drive switch in the fourth sub-section SP3, and turn on the fourth drive switch in the fifth sub-section SP5. 2 Turn the drive switch on. In this case, the first, third and fourth driving switches have a turn-off state in the first and fifth sub-sections, and the first, second and fourth driving switches are turned off in the second and fourth sub-sections. Has a state, and in the third sub-section, the first, second and third driving switches have a turn-off state.
본 실시예에 의하면, 조광신호(RS5)에 기초한 구동제어신호가 입력전압(Vin)에 따라 LED 광원부의 제2, 제3 및 제4 구동 스위치에 선택적으로 인가될 때, 입력전압(Vin)에 따른 구동 전압 및 구동 전류(ILED)가 입력 주기 전압의 특정 서브 구간(t9~t10)에서 LED 광원부에 공급된다. 즉, 제2, 제3 및 제4 구동 스위치의 순차 구동에 따라 LED 광원부에 구동 전류가 공급되면, 제1 서브 구간(SP4)에서 제1 및 제2 LED(D1, D2)가 점등하고, 제2 서브 구간(SP2)에서 제1 내지 제3 LED(D1, D2, D3)가 점등하고, 제3 서브 구간(SP1)에서 제1 내지 제4 LED(D1, D2, D3, D4)가 점등하고, 제4 서브 구간(SP3)에서 제1 내지 제3 LED(D1, D2, D3)가 점등하고, 제5 서브 구간(SP5)에서 제1 및 제2 LED(D1, D2)가 점등한다. 여기서, 제1 내지 제5 서브 구간의 길이는 실질적으로 동일할 수 있다.According to the present embodiment, when the driving control signal based on the dimming signal RS5 is selectively applied to the second, third and fourth driving switches of the LED light source unit according to the input voltage Vin, the driving voltage is applied to the input voltage Vin. According to the driving voltage and the driving current (I LED ) is supplied to the LED light source in a specific sub period (t9 ~ t10) of the input period voltage. That is, when the driving current is supplied to the LED light source unit according to the sequential driving of the second, third and fourth driving switches, the first and second LEDs D1 and D2 are turned on in the first sub-section SP4, and The first to third LEDs D1, D2, and D3 are turned on in the second sub period SP2, and the first to fourth LEDs D1, D2, D3, and D4 are turned on in the third sub period SP1. The first to third LEDs D1, D2, and D3 light up in the fourth sub period SP3, and the first and second LEDs D1 and D2 light up in the fifth sub period SP5. Here, the lengths of the first to fifth sub-sections may be substantially the same.
본 실시예에 따른 교류 LED 구동 및 조광 제어장치는, 도 8의 제1 조광레벨에서 단위 시간당 점등된 발광다이오드의 개수가 4개인 광 출력을 가진다고 할 때, 제5 조광레벨에서 단위 시간당 점등된 발광다이오드의 개수가 14개인 광 출력을 가진다.The AC LED driving and dimming control apparatus according to the present embodiment has a light output of four light emitting diodes lit per unit time at the first dimming level of FIG. 8, and emits light per unit time at the fifth dimming level. It has a light output of 14 diodes.
도 13은 본 발명의 다른 실시예에 따른 교류 LED 구동 및 조광 제어방법을 조광레벨에 따라 나타낸 도면이다.13 is a view showing an AC LED driving and dimming control method according to another embodiment of the present invention according to the dimming level.
도 8 내지 도 12를 참조한 앞서 설명한 실시예에 따른 교류 LED 구동 및 조광 제어방법은 기준시점을 기준으로 좌우 대칭적으로 연장되거나 축소된 조광신호를 이용하는 경우에 해당하고, 도 13을 참조한 본 실시예의 교류 LED 구동 및 조광 제어방법은 기준시점을 기준으로 구형파 신호의 전연부 및 후연부가 서로 다른 폭으로 연장되거나 축소된 조광신호를 이용하는 경우에 해당한다.The AC LED driving and dimming control method according to the above-described embodiment with reference to FIGS. 8 to 12 corresponds to a case in which a dimming signal extended or reduced symmetrically with respect to the reference time point is used, and FIG. The AC LED driving and dimming control method corresponds to a case in which the front and rear edges of the square wave signal use dimming signals extended or reduced in different widths based on the reference time point.
도 13을 참조하면, 본 실시예에 따른 교류 LED 구동 및 조광 제어장치는 입력전압이 최대값을 가지는 시점인 기준시점에서 구형파 펄스를 생성하고, 기준시점 양측에서 구형파 신호의 전연부와 후연부의 위치를 서로 다르게 조정함으로써 조광레벨의 고저에 따라 구형파 신호의 폭이 연장되거나 축소된 조광신호를 생성할 수 있다. 또한, 교류 LED 구동 및 조광 제어장치는 조광신호에 기초하여 입력전압, 입력전압에 따른 구동전압 및 구동전류 중 적어도 어느 하나를 제한하기 위한 구동제어신호를 LED 광원부에 인가함으로써 조광레벨 하에서 입력전압의 크기가 증가함에 따라 발광하는 LED 그룹의 수가 증가하거나 입력전압의 크기가 감소함에 따라 발광하는 LED 그룹의 수가 감소하도록 LED 광원부의 구동 및 조광을 제어할 수 있다.Referring to FIG. 13, the AC LED driving and dimming control apparatus according to the present embodiment generates a square wave pulse at a reference time point at which the input voltage has a maximum value, and the front and rear edge portions of the square wave signal at both sides of the reference time point. By adjusting the positions differently, it is possible to generate a dimming signal in which the width of the square wave signal is extended or reduced according to the height of the dimming level. In addition, the AC LED driving and dimming control device applies a driving control signal for limiting at least one of an input voltage, a driving voltage according to the input voltage, and a driving current based on the dimming signal to the LED light source unit to control the input voltage under the dimming level. As the size increases, the driving and dimming of the LED light source unit may be controlled so that the number of LED groups emitting light increases or the number of LED groups emitting light decreases as the size of the input voltage decreases.
전술한 좌우 비대칭 조광신호(기준시점 기준)에 대응하는 광 출력(제6 조광레벨에 대응)을 가지는 경우를 도 12의 제5 조광레벨에 대응하는 광 출력을 가지는 경우를 참조하여 설명하면 다음과 같다.The case of having the light output (corresponding to the sixth dimming level) corresponding to the above-described left and right asymmetric dimming signal (reference point reference point) will be described with reference to the case of having the light output corresponding to the fifth dimming level of FIG. 12. same.
조광레벨이 제6 조광레벨일 때, 교류 LED 구동 및 조광 제어장치는, 입력전압(Vin)이 최대값을 가지는 시점인 기준시점(t0)에서 구형파 신호를 생성하고, 생성된 구형파 신호의 전연부와 후연부가 기준시점 양측에서 기준시점을 기준으로 서로 다른 폭을 가진 시점에 위치하도록 조정함으로써 기준시점을 기준으로 좌우 비대칭적인 조광신호(RS6)를 생성한다.When the dimming level is the sixth dimming level, the AC LED driving and dimming control device generates a square wave signal at a reference time point t0 at which the input voltage Vin has a maximum value, and the leading edge of the generated square wave signal. The rear and rear edges are adjusted to be positioned at points of different widths from both sides of the reference point to generate the left and right asymmetric dimming signals RS6 with respect to the reference point.
교류 LED 구동 및 조광 제어장치는 조광신호(RS6)에 기초한 구동제어신호를 특정 서브 구간(t9~t11) 동안 LED 광원부의 구동 스위치에 인가한다. 즉, LED 발광제어부는 조광신호(RS5)에 기초한 PWM 구동제어신호를 통해 제1 서브 구간(SP4)에서 제2 구동 스위치를 턴-온하고, 제2 서브 구간(SP2)에서 제3 구동 스위치를 턴-온하고, 제3 서브 구간(SP1)에서 제4 구동 스위치를 턴-온하고, 제4 서브 구간(SP3)에서 제3 구동 스위치를 턴-온한다. 여기서, 제1 서브 구간에서 제1, 제3 및 제4 구동 스위치는 턴-오프 상태를 가지고, 제2 및 제4 서브 구간에서 제1, 제2 및 제4 구동 스위치는 턴-오프 상태를 가지며, 제3 서브 구간에서 제1, 제2 및 제3 구동 스위치는 턴-오프 상태를 가진다.The AC LED driving and dimming control device applies a driving control signal based on the dimming signal RS6 to the driving switch of the LED light source unit during the specific sub period t9 to t11. That is, the LED emission controller turns on the second driving switch in the first sub-section SP4 through the PWM driving control signal based on the dimming signal RS5 and turns on the third driving switch in the second sub-section SP2. Turn on, turn on the fourth driving switch in the third sub-section SP1, turn on the third driving switch in the fourth sub-section SP3. Here, the first, third and fourth driving switches have a turn-off state in the first sub-section, and the first, second and fourth driving switches have a turn-off state in the second and fourth sub-sections. In the third sub-section, the first, second and third driving switches have a turn-off state.
본 실시예에 의하면, 조광신호(RS6)에 기초한 구동제어신호가 입력전압(Vin)에 따라 LED 광원부의 제2, 제3 및 제4 구동 스위치에 선택적으로 인가될 때, 입력전압(Vin)에 따른 구동 전압 및 구동 전류(ILED)가 입력 주기 전압의 특정 서브 구간(t9~t11)에서 LED 광원부에 공급된다. 즉, 제2, 제3 및 제4 구동 스위치의 순차 구동에 따라 LED 광원부에 구동 전류가 공급되면, 제1 서브 구간(SP4)에서 제1 및 제2 LED(D1, D2)가 점등하고, 제2 서브 구간(SP2)에서 제1 내지 제3 LED(D1, D2, D3)가 점등하고, 제3 서브 구간(SP1)에서 제1 내지 제4 LED(D1, D2, D3, D4)가 점등하고, 제4 서브 구간(SP3)에서 제1 내지 제3 LED(D1, D2, D3)가 점등한다.According to the present embodiment, when the driving control signal based on the dimming signal RS6 is selectively applied to the second, third and fourth driving switches of the LED light source part in accordance with the input voltage Vin, the driving voltage is applied to the input voltage Vin. According to the driving voltage and the driving current (I LED ) is supplied to the LED light source in a specific sub period (t9 ~ t11) of the input period voltage. That is, when the driving current is supplied to the LED light source unit according to the sequential driving of the second, third and fourth driving switches, the first and second LEDs D1 and D2 are turned on in the first sub-section SP4, and The first to third LEDs D1, D2, and D3 are turned on in the second sub period SP2, and the first to fourth LEDs D1, D2, D3, and D4 are turned on in the third sub period SP1. In the fourth sub-section SP3, the first to third LEDs D1, D2, and D3 light up.
전술한 좌우 비대칭형인 조광신호를 응용하면, 도 8 내지 도 12에서의 좌우 대칭형인 조광신호와의 조합 등으로 LED 조광 제어에 있어서 부분 점등의 문제점을 제거하고 조밀한 조광레벨의 구현이 가능하다.When the above-described left and right asymmetric dimming signal is applied, the combination of the left and right asymmetric dimming signals in FIGS. 8 to 12 eliminates the problem of partial lighting in the LED dimming control and enables the implementation of a dense dimming level.
본 실시예에 의하면, 본 발명의 교류 LED 구동 및 조광 제어장치와 그 방법에서는 입력전압이 최대값을 가지는 기준시점에 대응하여 생성되는 구형파 신호나 그와 유사한 신호라면, 신호의 중앙부가 기준시점 상에 위치하던지 신호의 전연부나 후연부가 기준시점 상에 위치하던지 상관없이 본 발명에 적용할 수 있음을 알 수 있다. 즉, 본 발명의 실시예에 따른 교류 LED 구동 및 조광 제어장치와 그 방법은 LED 광원부의 광 출력 제어 시 LED 광원부의 발광다이오드의 전체 점등을 기본으로 할 수 있도록 기준시점에 대응하여 생성된 신호라면 기준시점 기준의 좌우 대칭 또는 좌우 비대칭 조광신호 모두를 이용할 수 있다.According to the present embodiment, in the AC LED driving and dimming control apparatus and method of the present invention, if the input voltage is a square wave signal or a similar signal generated corresponding to a reference point having a maximum value, the center portion of the signal is on the reference point. It can be seen that the present invention can be applied regardless of whether it is located at the front edge or the trailing edge of the signal. That is, the alternating current LED driving and dimming control apparatus and method according to an embodiment of the present invention, if the signal generated in response to the reference time so as to be based on the entire lighting of the light emitting diode of the LED light source when controlling the light output of the LED light source unit Both left-right symmetrical or left-right asymmetric dimming signals of the reference time point may be used.
본 발명은 이상에서 살펴본 바와 같이 바람직한 실시예를 들어 도시하고 설명하였으나, 상기한 실시예에 한정되지 아니하며 본 발명의 사상을 벗어나지 않는 범위 내에서 당해 발명이 속하는 기술분야에서 통상의 지식을 가진 자에 의해 다양한 변경, 치환, 수정이 가능할 것이며, 이러한 변경, 치환, 수정 등은 본 발명의 특허청구범위에 속하는 것으로 보아야 할 것이다.Although the present invention has been shown and described with reference to the preferred embodiments as described above, it is not limited to the above embodiments and those skilled in the art without departing from the spirit of the present invention. Various changes, substitutions, and modifications may be made by the present invention. Such changes, substitutions, and modifications should be regarded as falling within the claims of the present invention.
본 발명은 교류 발광다이오드 구동 및 조광 제어장치와 그 방법에 관한 것이다.The present invention relates to an AC light emitting diode driving and dimming control device and method thereof.

Claims (17)

  1. 시간에 따라 주기적으로 전압의 크기가 변하는 입력전압을 수신하는 입력전압 수신부;An input voltage receiver configured to receive an input voltage whose voltage varies periodically with time;
    조광레벨의 고저에 따라 복수의 LED(Light emitting diode) 그룹을 구비한 LED 광원부가 발광하는 시간인 발광구간의 길이를 조절하기 위한 신호로서, 상기 입력전압이 최대값을 가지는 시점인 기준시점에서 생성된 구형파 신호의 전연부(raising edge) 및 후연부(falling edge)의 위치를 상기 기준시점 양측에서 일정 폭으로 조정함으로써 상기 조광레벨의 고저에 따라 상기 구형파 신호의 폭이 연장되거나 축소된 조광신호를 생성하는 조광 제어부; 및A signal for controlling the length of a light emitting section, which is a time that an LED light source including a plurality of light emitting diode (LED) groups emits light according to the level of dimming level, and is generated at a reference time point when the input voltage has a maximum value. By adjusting the positions of the rising edge and the falling edge of the square wave signal, the width of the square wave signal is extended or reduced according to the elevation of the dimming level by adjusting the positions of the rising edge and the falling edge of the square wave signal. A dimming control unit to generate; And
    상기 조광신호에 응답하여 상기 입력전압, 상기 입력전압에 따른 구동전압 및 구동전류 중 적어도 어느 하나를 제한하는 구동제어신호를 상기 LED 광원부에 인가함으로써 상기 조광레벨 하에서 상기 입력전압의 크기가 증가함에 따라 발광하는 LED 그룹의 수가 증가하거나 상기 입력전압의 크기가 감소함에 따라 발광하는 LED 그룹의 수가 감소하도록 상기 LED 광원부의 구동 및 조광을 제어하는 LED 발광제어부;를 포함하는 것을 특징으로 하는 교류 LED 구동 및 조광 제어장치.As the magnitude of the input voltage increases under the dimming level by applying a driving control signal for limiting at least one of the input voltage, the driving voltage according to the input voltage, and a driving current in response to the dimming signal to the LED light source unit. And an LED emission control unit for controlling driving and dimming of the LED light source unit such that the number of LED groups emitting light decreases as the number of LED groups emitting light increases or the magnitude of the input voltage decreases. Dimming Control.
  2. 제1항에 있어서,The method of claim 1,
    상기 조광 제어부는, 상기 구형파 신호의 전연부(raising edge) 및 후연부(falling edge)의 위치를 상기 기준시점을 기준으로 좌우 대칭적으로 조정함으로써 상기 조광레벨의 고저에 따라 상기 구형파 신호의 폭이 연장되거나 축소된 상기 조광신호를 생성하는 것을 특징으로 하는 교류 LED 구동 및 조광 제어장치.The dimming control unit adjusts the positions of the rising edge and the falling edge of the square wave signal symmetrically with respect to the reference time point to increase the width of the square wave signal according to the elevation of the dimming level. AC LED driving and dimming control device, characterized in that for generating the dimming signal extended or reduced.
  3. 제1항에 있어서,The method of claim 1,
    상기 조광 제어부는 상기 구형파 신호의 전연부(raising edge) 및 후연부(falling edge)의 위치를 상기 기준시점을 기준으로 상기 기준시점 양측에서 서로 다른 거리에 위치하도록 조정함으로써, 상기 조광레벨의 고저에 따라 상기 구형파 신호의 폭이 연장되거나 축소된 상기 조광신호를 생성하는 것을 특징으로 하는 교류 LED 구동 및 조광 제어장치.The dimming control unit adjusts the positions of the rising edge and the falling edge of the square wave signal to be located at different distances from both sides of the reference time point with respect to the reference time point, thereby adjusting the height of the dimming level. And the dimming signal of which the width of the square wave signal is extended or reduced is generated.
  4. 제1항에 있어서,The method of claim 1,
    상기 조광 제어부는,The dimming control unit,
    상기 입력전압의 영점을 검출하는 영점 검출부;A zero detector detecting zero of the input voltage;
    상기 영점에 기초하여 상기 입력전압이 최대값을 가지는 시점인 기준시점을 검출하는 위상 검출부; 및A phase detector configured to detect a reference time point at which the input voltage has a maximum value based on the zero point; And
    상기 구형파 펄스의 전연부(raising edge) 및 후연부(falling edge)가 상기 조광레벨의 고저에 따라 상기 기준시점을 기준으로 상기 기준시점 양측으로 일정 폭만큼 연장된 상기 조광신호를 생성하는 조광신호 생성부를 구비하는 것을 특징으로 하는 교류 LED 구동 및 조광 제어장치.Generation of a dimming signal in which the rising edge and the falling edge of the square wave pulse generate the dimming signal extended by a predetermined width to both sides of the reference time point based on the height of the dimming level. AC LED driving and dimming control device comprising a unit.
  5. 제4항에 있어서,The method of claim 4, wherein
    상기 LED 발광제어부는, 상기 조광신호에 기초하여 상기 복수의 LED 그룹을 순차구동하기 위한 상기 구동제어신호를 출력하는 PWM(Pulse Width Modulation) 컨트롤러를 구비하는 것을 특징으로 하는 교류 LED 구동 및 조광 제어장치.The LED light emission control unit, the AC LED driving and dimming control device comprising a PWM (Pulse Width Modulation) controller for outputting the drive control signal for sequentially driving the plurality of LED groups based on the dimming signal .
  6. 제5항에 있어서,The method of claim 5,
    상기 복수의 LED 그룹에 흐르는 전류를 각각 제어하기 위한 복수의 구동 스위치를 더 포함하고,Further comprising a plurality of drive switches for respectively controlling the current flowing through the plurality of LED groups,
    상기 각 LED 그룹에 직렬 연결되는 각 구동 스위치는 상기 구동제어신호에 응답하여 선택적으로 온 동작하는 것을 특징으로 하는 LED 구동 및 조광 제어장치.And each driving switch connected in series to each of the LED groups is selectively turned on in response to the driving control signal.
  7. 제6항에 있어서,The method of claim 6,
    상기 구동 스위치를 통해 흐르는 전류를 검출하여 상기 LED 발광제어부에 제공하는 보호회로부를 더 포함하는 것을 특징으로 하는 교류 LED 구동 및 조광 제어장치.AC driving and dimming control device further comprises a protection circuit unit for detecting the current flowing through the drive switch and provided to the LED light emission control unit.
  8. 제7항에 있어서,The method of claim 7, wherein
    상기 LED 발광제어부는 상기 보호회로부로부터의 전류검출 신호에 기초하여 상기 복수의 LED 그룹을 정전류 구동하는 것을 특징으로 하는 교류 LED 구동 및 조광 제어장치.And the LED light emission control unit drives a constant current of the plurality of LED groups based on a current detection signal from the protection circuit unit.
  9. 제1항에 있어서,The method of claim 1,
    상기 조광레벨의 고저를 조절하기 위한 조광 기준신호를 생성하여 상기 조광 제어부에 공급하는 조광 인터페이스를 더 포함하는 것을 특징으로 하는 교류 LED 구동 및 조광 제어장치.And an dimming interface for generating a dimming reference signal for adjusting the height of the dimming level and supplying it to the dimming control unit.
  10. 제1항에 있어서,The method of claim 1,
    상기 입력전압 수신부는 입력 교류 전원을 정류하여 상기 입력전압을 출력하는 정류부를 구비하는 것을 특징으로 하는 교류 LED 구동 및 조광 제어장치.And the input voltage receiver comprises a rectifier for rectifying an input AC power and outputting the input voltage.
  11. 시간에 따라 주기적으로 전압의 크기가 변동하는 입력전압을 수신하는 제1 단계;A first step of receiving an input voltage whose voltage varies periodically with time;
    상기 입력전압이 최대값을 가지는 시점인 기준시점에서 구형파 신호를 생성하는 제2 단계;Generating a square wave signal at a reference time point at which the input voltage has a maximum value;
    상기 기준시점 양측에서 상기 구형파 신호의 전연부(raising edge)와 후연부(falling edge)의 위치를 조정함으로써 조광레벨의 고저에 따라 상기 구형파 신호의 폭이 연장되거나 축소된 조광신호를 생성하는 제3 단계; 및A third dimming signal in which the width of the square wave signal is extended or reduced in accordance with the height of the dimming level by adjusting the positions of the rising edge and the falling edge of the square wave signal at both sides of the reference time point; step; And
    상기 조광신호에 기초하여 복수의 LED 그룹을 구비한 LED 광원부에 구동제어신호를 인가함으로써 상기 조광레벨의 고저에 따라 제한된 상기 입력전압에 따른 구동전압 또는 구동전류로 상기 LED 광원부의 구동 및 조광을 제어하는 제4 단계;를 포함하고,The driving and dimming of the LED light source is controlled by a driving voltage or a driving current according to the input voltage limited by the height of the dimming level by applying a driving control signal to the LED light source having a plurality of LED groups based on the dimming signal. To include; a fourth step;
    상기 LED 광원부는 상기 조광레벨 하에서 상기 입력전압의 크기가 증가함에 따라 발광하는 LED 그룹의 수가 증가하거나 상기 입력전압의 크기가 감소함에 따라 발광하는 LED 그룹의 수가 감소하도록 동작하는 것을 특징으로 하는 교류 LED 구동 및 조광 제어방법.The LED light source unit operates under the dimming level to increase the number of LED groups that emit light as the magnitude of the input voltage increases or to decrease the number of LED groups that emit light as the magnitude of the input voltage decreases. Driving and dimming control method.
  12. 제11항에 있어서,The method of claim 11,
    상기 제3 단계는, 상기 구형파 신호의 전연부(raising edge) 및 후연부(falling edge)의 위치를 상기 기준시점을 기준으로 좌우 대칭적으로 조정함으로써 상기 조광레벨의 고저에 따라 상기 구형파 신호의 폭이 연장되거나 축소된 상기 조광신호를 생성하는 것을 특징으로 하는 교류 LED 구동 및 조광 제어방법.The third step may include adjusting the positions of the rising edge and the falling edge of the square wave signal symmetrically with respect to the reference time point so that the width of the square wave signal depends on the height of the dimming level. Alternating current LED driving and dimming control method characterized in that for generating the extended or reduced dimming signal.
  13. 제11항에 있어서,The method of claim 11,
    상기 제3 단계는, 상기 구형파 신호의 전연부(raising edge) 및 후연부(falling edge)의 위치를 상기 기준시점을 기준으로 상기 기준시점 양측에서 서로 다른 거리에 위치하도록 조정함으로써, 상기 조광레벨의 고저에 따라 상기 구형파 신호의 폭이 연장되거나 축소된 상기 조광신호를 생성하는 것을 특징으로 하는 교류 LED 구동 및 조광 제어방법.The third step may include adjusting the positions of the rising edge and the falling edge of the square wave signal to be located at different distances from both sides of the reference time point with respect to the reference time point. AC driving and dimming control method for generating the dimming signal in which the width of the square wave signal is extended or reduced in accordance with the height.
  14. 제12항 또는 제13항에 있어서,The method according to claim 12 or 13,
    상기 제4 단계는, 상기 복수의 LED 그룹을 순차구동하는 PWM(Pulse Width Modulation) 구동제어신호를 상기 LED 광원부에 공급함으로써 상기 LED 광원부의 구동 및 조광을 제어하는 것을 특징으로 하는 교류 LED 구동 및 조광 제어방법.In the fourth step, the driving and dimming of the LED light source unit is controlled by supplying a pulse width modulation (PWM) driving control signal for sequentially driving the plurality of LED groups to the LED light source unit. Control method.
  15. 제14항에 있어서,The method of claim 14,
    상기 구동제어신호에 의해 온 또는 오프 구동되는 구동 스위치를 보호하고 상기 LED 광원부의 구동 전류를 미리 설정된 범위로 제한하기 위해 상기 구동 스위치에 흐르는 전류를 검출하는 단계를 더 포함하는 것을 특징으로 하는 교류 LED 구동 및 조광 제어방법.And detecting a current flowing through the driving switch to protect the driving switch driven on or off by the driving control signal and to limit the driving current of the LED light source unit to a preset range. Driving and dimming control method.
  16. 제11항에 있어서,The method of claim 11,
    상기 제3 단계 전에, 조광 인터페이스로부터 상기 조광레벨의 고저를 나타내는 조광 기준 신호를 수신하는 단계를 더 포함하는 것을 특징으로 하는 교류 LED 구동 및 조광 제어방법.And, before the third step, receiving a dimming reference signal indicating a high or low level of the dimming level from a dimming interface.
  17. 제11항에 있어서,The method of claim 11,
    상기 제1 단계는, 외부 입력 교류 전원을 정류하여 상기 입력전압을 수신하는 것을 특징으로 하는 교류 LED 구동 및 조광 제어방법.The first step, the AC LED driving and dimming control method characterized in that for receiving the input voltage by rectifying the external input AC power.
PCT/KR2013/010144 2012-11-08 2013-11-08 Device and method for controlling operation and dimming of ac led WO2014073911A1 (en)

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