CN107172766B - LED power-adjustable switchs color-temperature regulating and controls driving circuit - Google Patents
LED power-adjustable switchs color-temperature regulating and controls driving circuit Download PDFInfo
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- CN107172766B CN107172766B CN201710582106.0A CN201710582106A CN107172766B CN 107172766 B CN107172766 B CN 107172766B CN 201710582106 A CN201710582106 A CN 201710582106A CN 107172766 B CN107172766 B CN 107172766B
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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]
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- 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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a kind of LED power-adjustable switch color-temperature regulatings to control driving circuit, including power module, two paths of LED lighting circuit and light adjusting circuit；The LED illumination includes LED lamp tube, resistance, capacitor and inductance；It further include LED current setting module and LED open-circuit-protection module; LED open-circuit-protection module includes adjusting resistance R2 for the inductance minimum demagnetization time to be arranged; the LED current setting module includes an adjusting resistance R1; LED current setting module is according to resistance R1 and adjusts resistance R2 resistance value setting inductive current; to adjust LED power; whole system only has a control chip; reduce peripheral circuit; system cost is saved; and LED current in the case where colour mixture can be adjusted by external resistance.
Description
Technical field
The present invention relates to field of LED drive technologies, and in particular to a kind of LED power-adjustable switch color-temperature regulating control driving electricity
Road.
Background technique
At present in LED switch toning temperature control system, 3 chip controls are all used mostly, which includes two LED
Driving chip and a MCU.Such as application No. is 201310057625.7 patents to disclose a kind of color temperature-tunable LED of tunable optical
Driving circuit, to drive the LED light device being made of N paths of LEDs lamp string, N >=2, including a buck type power stage circuit, one
Driving circuits and N number of controllable switch；Wherein, each LED light string and a corresponding controllable switch, and
Freewheeling diode in the buck type power stage circuit is connected in series in the power switch in the buck type power stage circuit
Between pipe and the public connecting end and a ground potential of outputting inductance；The driving circuits are according to the LED light device
Light modulation and color temperature information, to generate N+1 control signal, to control the power switch tube respectively and N number of described controllably open
The switch motion of pass, has been separately provided with MCU, and structure is complicated.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of MCU that need not be arranged to control chip, and the LED of power adjustable
Color-temperature regulating controls driving circuit.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is that: a kind of LED power-adjustable switchs color-temperature regulating
Control driving circuit, including power module, two paths of LED lighting circuit and light adjusting circuit；The LED illumination circuit includes LED
Fluorescent tube, resistance, capacitor and inductance；The LED light adjusting circuit includes channel selecting module, system control module, demagnetization time
Detection module, peak detection block and several high power metal-oxide-semiconductors；System control module controls LED by high power metal-oxide-semiconductor
Lighting circuit on-off, and connect peak detection block and demagnetization time detection module；The time detection module that demagnetizes connects LED illumination
Circuit and system control module, demagnetization time detection module detects LED illumination circuit demagnetization signal, and passes through system control module
High power metal-oxide-semiconductor is opened, is magnetized to LED illumination circuit；Peak detection block connects system control module and LED illumination electricity
High power metal-oxide-semiconductor is closed for the peak point current of LED illumination circuit to be arranged, and by system control module, to LED illumination in road
Circuit demagnetizes, and channel selecting module issues control signal to system control module, for illuminating according to bus power-off signal
The selection of circuit, further includes LED current setting module and LED open-circuit-protection module, and LED open-circuit-protection module includes adjusting electricity
Resistance R2 includes an adjusting resistance R1 for inductance minimum demagnetization time, the LED current setting module to be arranged, and LED current is set
Cover half root tuber is according to resistance R1 and adjusts resistance R2 resistance value setting inductive current, to adjust LED power.
Further, the LED current setting module includes comparator, capacitor CAP, capacitor charge and discharge unit and capacitor
Charging control unit, the output end of the comparator connect system control module, and the one end capacitor CAP connects the anode of comparator,
The cathode of other end ground connection, comparator connects reference voltage, and when capacitor CAP is discharged to the reference voltage of comparator, comparator is produced
Raw energizing signal is to system control module, and the charging current of capacitor charge and discharge unit is set by resistance R2, and discharge current is by resistance
Capacitor CAP is switched to discharge condition from charged state after lighting circuit demagnetizes by R1 setting, capacitor charging control unit.
Further, the capacitor charging control unit includes the NMOS tube and PMOS tube and logic control that common gate connects
Molding block；The output end connection NMOS tube of the Logic control module and the grid of PMOS tube, when lighting circuit demagnetization terminates
Afterwards, high level signal is issued, after capacitor electric discharge, issues low level signal；The drain electrode of NMOS tube and the source electrode of PMOS tube
It is connected, the source electrode of NMOS tube connects capacitor discharging circuit, and the drain electrode of PMOS tube connects capacitor charging circuit, capacitor charging circuit
Electric current is I2, and I2 is K times of electric current I1, and wherein I1 is the size of current by resistance R2, and the electric current of the electric circuit of capacitor electric discharge is
The electric current of I3, I3 are J times of ISET electric current, and wherein ISET is the size of current by resistance R1, capacitor CAP connection NMOS tube
The source electrode of drain electrode or PMOS tube.
Further, the input terminal of the Logic control module accesses two pulse signals, one of them is DRV driving letter
Number, waveform is identical as the drive waveforms of high power metal-oxide-semiconductor, another is trigger signal, terminates to issue height when lighting circuit demagnetizes
Level triggers signal.
Further, the channel selecting module includes ULVO module, gate time detection unit, bus detection of power loss list
Member and channel selection unit, the UVLO module are used to be arranged the voltage up and down of LED illumination circuit opening and closing, prevent anti-
Multiple open and close；The bus detection of power loss unit connection UVLO module and bus detect the power down of busbar voltage, count
Number time detection units detect bus power down times, and channel selection unit is according to the bus power down time of gate time detection unit
Signal switches over the control signal of system control module.
From above-mentioned technical proposal it can be seen that the invention has the following advantages that whole system only has a control chip, subtract
Few peripheral circuit has saved system cost, and can adjust LED current in the case where colour mixture by external resistance.
Detailed description of the invention
Fig. 1 is functional block diagram of the invention；
Fig. 2 is LED open-circuit-protection module in the present invention；
Fig. 3 is the circuit diagram of electric current setting module in the present invention；
Fig. 4 is the waveform diagram of each signal in the present invention.
Specific embodiment
Below in conjunction with attached drawing, specific embodiments of the present invention will be described in detail.
As shown in Figure 1, LED power-adjustable switch color-temperature regulating of the invention controls driving circuit, including power module, two-way
LED illumination circuit and light adjusting circuit；The LED illumination circuit including LED lamp tube, resistance, capacitor and inductance, LED lamp tube two
End is connected in parallel with a capacitor, resistance and inductance, and Schottky tube is provided between inductance and LED light.Inductance passes through Schottky tube and LED
Fluorescent tube electric discharge, this discharge time are the demagnetization time；Conversely, to magnetize the time.
The LED light adjusting circuit includes channel selecting module, system control module, demagnetization time detection module, peak value inspection
Survey module, LED current setting module, LED open-circuit-protection module and several high power metal-oxide-semiconductors.Bus is also connected with a 5V electricity
Generation module is pressed, for the low-voltage module power supply to internal system, is equivalent to a linear voltage regulator.
System control module is independent two groups of switching channels, controls LED illumination by opening and closing high power metal-oxide-semiconductor
Connecting and disconnecting of the circuit, and connect peak detection block and demagnetization time detection module.
Demagnetize time detection module connection LED illumination circuit and system control module, and demagnetization time detection module detects LED
Lighting circuit demagnetization signal, and high power metal-oxide-semiconductor is opened by system control module, it magnetizes to LED illumination circuit；Peak value
Detection module connects system control module and LED illumination circuit, for the peak point current of LED illumination circuit to be arranged, and passes through and is
Control module of uniting closes high power metal-oxide-semiconductor, demagnetizes to LED illumination circuit.When inductive current is 0, then demagnetization terminates, at this time
The detection module that demagnetizes is fed back according to the signal of high-voltage MOS pipe grid, by system control module, is opened high-voltage MOS pipe, is worked as grid
Voltage has reached reference voltage, then peak detection block closes high-voltage MOS pipe, and system enters demagnetization detecting state at this time, such as
This is repeatedly.The structure of peak detection block includes two peak detection comparators, is separately connected the source electrode of two high-voltage MOS pipes,
Input terminal input reference voltage (reference voltage of this chip is 0.4V, can also be other voltages), after system electrification, MOS
The source voltage of pipe slowly rises, and when reaching reference voltage, peak comparator sends control signal to system control module, into
And high-voltage MOS pipe is closed, inductance starts demagnetization electric discharge at this time, and after demagnetization, demagnetization time detection module opens high-pressure MOS
Pipe, loops back and forth like this.Peak detection block controls high pressure by the peak value of the setting adjustable inductive discharge of reference voltage
The closing of MOSFET, to control the peak point current of inductance, peak point current is set as Ip=VREF/RCS, and wherein VREF is inside
Reference voltage, RCS are the external sampling resistor of the port ISEN1 ISEN2, (generally it is identical to set this resistance for we).
Channel selecting module includes ULVO module, gate time detection unit, bus detection of power loss unit and channel choosing
Unit is selected, the UVLO module is used to be arranged the voltage up and down of LED illumination circuit opening and closing, prevents open and close repeatedly；
The bus detection of power loss unit connection UVLO module and bus detect the power down of busbar voltage, and gate time detection is single
Member detection bus power down time, channel selection unit is according to the bus power down time signal of gate time detection unit to system control
The control signal of molding block switches over.
LED open-circuit-protection module is as shown in Fig. 2, mainly include comparator and operational amplifier, V1 is a base in figure
Standard, inner setting 0.5V, V2 are also a benchmark, and inner setting 2.5V, DRV are driving signals, when MOFET conducting then,
Drag down comparator+end, when MOFET close then comparator+end start to charge reach V2 voltage, then comparator overturn, generate
One pulse signal, this signal width have the resistance sizes of the port resistance RADJ to determine, the width of this pulse signal determines
The demagnetization time of LED, to carry out overvoltage protection voltage to LED.
As shown in figures 1 and 3, LED current setting module include an adjusting resistance R1, LED current setting module according to
Inductive current is arranged in resistance R1 and adjusting resistance R2 resistance value, to adjust LED power, it is same for adjusting resistance R2 and resistance RADJ
Resistance.LED current setting module includes comparator, capacitor CAP, capacitor charge and discharge unit and capacitor charging control unit, institute
The output end connection system control module of comparator is stated, the one end capacitor CAP connects the anode of comparator, and other end ground connection is compared
The cathode of device connects reference voltage, and when capacitor CAP is discharged to the reference voltage of comparator, comparator generates energizing signal to system
The charging current of control module, capacitor charge and discharge unit is set by resistance R2, and discharge current is set by resistance R1, capacitor charging control
Capacitor CAP is switched to discharge condition from charged state after lighting circuit demagnetizes by unit processed.
Capacitor charging control unit includes the NMOS tube that common gate connects and PMOS tube and Logic control module；It is described to patrol
It collects the output end connection NMOS tube of control module and the grid of PMOS tube issues high level after lighting circuit demagnetization
Signal issues low level signal after capacitor electric discharge；The drain electrode of NMOS tube is connected with the source electrode of PMOS tube, NMOS tube
Source electrode connects capacitor discharging circuit, and the drain electrode of PMOS tube connects capacitor charging circuit, and the electric current of capacitor charging circuit is I2, and I2 is
K times of electric current I1, wherein I1 is the size of current by resistance R2, and the electric current of the electric circuit of capacitor electric discharge is I3, and the electric current of I3 is
J times of ISET electric current, wherein ISET is the size of current by resistance R1, the drain electrode of capacitor CAP connection NMOS tube or PMOS
The source electrode of pipe.
The input terminal of Logic control module accesses two pulse signals, one of them is DRV driving signal, waveform and Gao Gong
The drive waveforms of rate metal-oxide-semiconductor are identical, another is trigger signal, terminate to issue high trigger signal when lighting circuit demagnetizes.
System Working Principle is as follows: vdd voltage rises to the upper voltage of UVLO after system electrification, then system starts work
Make, system default selector channel 1 (DN1 and ISEN1 are formed by performance loop) works at this time, (DN2 the and ISEN2 institute shape of channel 2
At performance loop) close.LED light corresponding to channel 1 is bright, and LED light corresponding to channel 2 is gone out.Shutdown switch at this time, and protect
The time is held greater than 75ms less than 5S, reopens switch, then LED light corresponding to channel 1 is gone out, LED light corresponding to channel 2
It is bright.It turns off switch again at this time, and so that the retention time is greater than 75ms and be less than 5S, then turn on the switch, then corresponding to channel 1 and channel 2
LED light all light.When channel 1 connects white light (yellow light).Channel 2 connects yellow light (white light), then realizes white light during switching,
Yellow light, colour mixture or yellow light, white light, effect as colour mixture.
Colour mixture power-adjustable principle: normal color-temperature regulating drive module, each channel is in the case where monochrome and colour mixture
In the case of, power is will not be changed, that is to say, that A watts when in monochromatic situation, then being then 2* in the case where colour mixture
A watts.The invention is by adjusting RSET foot resistance, then adjustable LED current in the case where colour mixture, then adjustable colour mixture
Power.
In the case where single channel, system is worked under BCM mode, and the current waveform on inductance is as shown in Figure 1, so at this time
LED current is exactly
The present invention is then the ratio by setting RSET pin resistance R1 and RADJ pin resistance R2, to adjust LED current
's.Specific calculation formula is as follows:
Wherein IADJ is set by the resistance R2 of RADJ foot, and ISET (is shown in system frame by the resistance R1 setting of RSET foot in detail
Figure).Proportional current is obtained by the ratio of current source, then I2=IADJ*N*K, I3=ISET*J.
Specific workflow is as described below: DRV driving signal opens the efferent duct of system, whole system is made to start work
Make, inductive current starts to increase, and A point current potential is low potential at this time, and current source I2 charges to B point capacitor CAP, when inductive current increases
Being added to the IP of setting, then high pressure NMOS pipe is closed, and system starts to demagnetize, and A point current potential is still low potential at this time, and I2 pairs of current source
B point capacitor keeps charging.After system demagnetization, inductive current is that 0, ZCD signal exports a high potential pulse at this time, is made
A point jump in potential is high potential, then B point capacitor starts to discharge, and discharge current I3, inductive current remains 0 at this time, when B point
Capacitor is discharged to VREF current potential, then comparator is overturn, and C point exports high potential pulse and opens efferent duct high pressure NMOS, then system is opened
Beginning reworks.Repeatedly.Specific each signal is shown in Fig. 4.
In Fig. 4, the waveform of inductive current, the time of T1 is TON+TOFF, and wherein TON is the conducting of high pressure NMOS FET
Time, TOFF are then the demagnetization time of inductance.T2 is the time that inductive current is 0, then the electric current of the LED light exported is T1 is calculated, the time of T2 is as follows:
CAP×VCAP=I2 × T1=I3 × T2
I2=IADJ × N × K
I3=ISET × J
In the design, wherein N=K=J=1, VADJ=VSET.
Then it is calculated
In the application, the resistance that can first set RADJ sets RADJ resistance by setting OVP voltage, then root again
The resistance of RSET is set according to required electric current.
Claims (5)
1. a kind of LED power-adjustable switch color-temperature regulating controls driving circuit, including power module, two paths of LED lighting circuit and
Light adjusting circuit；The LED illumination circuit includes LED lamp tube, resistance, capacitor and inductance；Light adjusting circuit includes channel selecting mould
Block, system control module, demagnetization time detection module, peak detection block and several high power metal-oxide-semiconductors；System controls mould
Block controls LED illumination connecting and disconnecting of the circuit by control high power metal-oxide-semiconductor, and connects peak detection block and demagnetization time detection mould
Block；Demagnetize time detection module connection LED illumination circuit and system control module, and demagnetization time detection module detects LED illumination
Circuit demagnetization signal, and high power metal-oxide-semiconductor is opened by system control module, it magnetizes to LED illumination circuit；Peak detection
Module connecting system control module and LED illumination circuit for the peak point current of LED illumination circuit to be arranged, and pass through system control
Molding block closes high power metal-oxide-semiconductor, demagnetizes to LED illumination circuit, and channel selecting module is issued according to bus power-off signal
Control selection of the signal to system control module, for lighting circuit, it is characterised in that: further include LED current setting module with
And LED open-circuit-protection module, LED open-circuit-protection module includes adjusting resistance R2 for the inductance minimum demagnetization time to be arranged, described
LED current setting module includes an adjusting resistance R1, and LED current setting module is set according to resistance R1 and adjusting resistance R2 resistance value
Inductive current is set, to adjust LED power.
2. LED power-adjustable switch color-temperature regulating according to claim 1 controls driving circuit, it is characterised in that: the LED
Electric current setting module includes comparator, capacitor CAP, capacitor charge and discharge unit and capacitor charging control unit, the comparator
Output end connect system control module, the one end capacitor CAP connect comparator anode, the other end ground connection, the cathode of comparator
Reference voltage is connected, when capacitor CAP is discharged to the reference voltage of comparator, comparator generates energizing signal to system and controls mould
The charging current of block, capacitor charge and discharge unit is set by resistance R2, and discharge current is set by resistance R1, capacitor charging control unit
Capacitor CAP is switched into discharge condition from charged state after lighting circuit demagnetization.
3. LED power-adjustable switch color-temperature regulating according to claim 2 controls driving circuit, it is characterised in that: the electricity
Capacity charge control unit includes the NMOS tube that common gate connects and PMOS tube and Logic control module；The Logic control module
Output end connection NMOS tube and PMOS tube grid, when lighting circuit demagnetization after, issue high level signal, in capacitor
After electric discharge, low level signal is issued；The drain electrode of NMOS tube is connected with the source electrode of PMOS tube, and the source electrode of NMOS tube connects capacitor
Discharge circuit, the drain electrode of PMOS tube connect capacitor charging circuit, and the electric current of capacitor charging circuit is I2, and I2 is K times of electric current I1,
Wherein I1 is the size of current by resistance R2, and the electric current of capacitor discharging circuit is I3, and the electric current of I3 is J times of ISET electric current,
Wherein ISET is the size of current by resistance R1, the drain electrode of capacitor CAP connection NMOS tube or the source electrode of PMOS tube.
4. LED power-adjustable switch color-temperature regulating according to claim 3 controls driving circuit, it is characterised in that: described to patrol
The input terminal for collecting control module accesses two pulse signals, one of them is DRV driving signal, waveform and high power metal-oxide-semiconductor
Drive waveforms are identical, another is trigger signal, terminate to issue high trigger signal when lighting circuit demagnetizes.
5. LED power-adjustable switch color-temperature regulating according to claim 3 controls driving circuit, it is characterised in that: described logical
Road selecting module includes UVLO module, gate time detection unit, bus detection of power loss unit and channel selection unit, described
UVLO module is used to be arranged the voltage up and down of LED illumination circuit opening and closing, prevents open and close repeatedly；The bus power down
Detection unit connection UVLO module and bus detect the power down of busbar voltage, and gate time detection unit detection bus falls
Electric time, control of the channel selection unit according to the bus power down time signal of gate time detection unit to system control module
Signal switches over.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710582106.0A CN107172766B (en) | 2017-07-17 | 2017-07-17 | LED power-adjustable switchs color-temperature regulating and controls driving circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710582106.0A CN107172766B (en) | 2017-07-17 | 2017-07-17 | LED power-adjustable switchs color-temperature regulating and controls driving circuit |
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| CN107172766A CN107172766A (en) | 2017-09-15 |
| CN107172766B true CN107172766B (en) | 2019-03-01 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107949095A (en) * | 2017-10-31 | 2018-04-20 | 浙江凯耀照明股份有限公司 | LED light High voltage output control device and control method |
| CN108834261B (en) * | 2018-07-17 | 2020-08-21 | 西南科技大学 | Mixed light color temperature adjustable circuit control system and method |
| CN109379805A (en) * | 2018-10-16 | 2019-02-22 | 欧普照明股份有限公司 | Signal integration circuit and method and signal monitoring circuit and method |
| CN110138380B (en) * | 2019-04-01 | 2023-08-04 | 山东华翼微电子技术股份有限公司 | Power-down time monitoring circuit and method |
| CN113115495A (en) * | 2021-05-14 | 2021-07-13 | 东莞芯成电子科技有限公司 | LED illumination color temperature adjusting and discharging integrated control system |
| CN114019241A (en) * | 2021-11-11 | 2022-02-08 | 江苏科技大学 | Method and device for determining resistance value of resistor in power device driving circuit |
| CN114554648A (en) * | 2022-02-28 | 2022-05-27 | 深圳利普芯微电子有限公司 | Control circuit, overvoltage protection circuit, control chip and driving power supply |
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