CN112512159A - Lamp control system and control method thereof - Google Patents

Lamp control system and control method thereof Download PDF

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Publication number
CN112512159A
CN112512159A CN202011383308.0A CN202011383308A CN112512159A CN 112512159 A CN112512159 A CN 112512159A CN 202011383308 A CN202011383308 A CN 202011383308A CN 112512159 A CN112512159 A CN 112512159A
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China
Prior art keywords
resistor
circuit
capacitor
mos transistor
diode
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CN202011383308.0A
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Chinese (zh)
Inventor
李廷宏
罗小兵
赵华生
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Yixun Zhuhai Optoelectronics Technology Co ltd
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Yixun Zhuhai Optoelectronics Technology Co ltd
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Priority to CN202011383308.0A priority Critical patent/CN112512159A/en
Publication of CN112512159A publication Critical patent/CN112512159A/en
Priority to JP2021164056A priority patent/JP7330244B2/en
Pending legal-status Critical Current

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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]
    • H05B45/20—Controlling the colour 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
    • 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
    • H05B45/36—Circuits for reducing or suppressing harmonics, ripples or electromagnetic interferences [EMI]
    • 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

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

The invention discloses a lamp control system and a control method thereof, wherein the lamp control system comprises an LED light source component, an AC input end, an on-off switch, an EMI filter circuit, a rectification filter circuit, a voltage reduction circuit, a rectification output circuit, a voltage stabilizing circuit and a control circuit, wherein the EMI filter circuit is connected with the AC input end through the on-off switch, the EMI filter circuit, the rectification filter circuit, the voltage reduction circuit and the rectification output circuit are sequentially and electrically connected, the rectification filter circuit, the voltage stabilizing circuit, the control circuit and the voltage reduction circuit form a closed loop circuit, and the rectification output circuit is electrically connected with the LED light source component. The lamp control system is simple to operate, realizes brightness adjustment while realizing color temperature adjustment easily, and is simple in circuit structure and low in hardware cost.

Description

Lamp control system and control method thereof
Technical Field
The invention belongs to the field of lamp control, and particularly relates to a lamp control system and a control method thereof.
Background
LED light sources are gradually replacing incandescent and fluorescent light sources as fourth generation lighting sources due to their significant energy savings and life span advantages.
With the development of society, different use occasions and different environments in life have different requirements on color temperature and brightness. At present, the dimming mode of the LED lamp is divided into two types, namely direct current dimming and PWM dimming, the PWM is pulse width modulation, which is a very effective technology for controlling an analog circuit by using digital output of a microprocessor, and is widely applied in many fields from measurement, communication to power control and conversion.
However, the lamps in the current market are difficult to adjust the brightness while adjusting the color temperature, and have complex circuit structure and high hardware cost.
Disclosure of Invention
The invention aims to provide a lamp control system and a control method thereof, the lamp control system is simple to operate, can easily realize color temperature adjustment and brightness adjustment, and is simple in circuit structure and low in hardware cost.
The technical scheme is as follows:
the lamp control system comprises an LED light source assembly, an AC input end, an on-off switch, an EMI filter circuit, a rectification filter circuit, a voltage reduction circuit, a rectification output circuit, a voltage stabilizing circuit and a control circuit, wherein the EMI filter circuit is connected with the AC input end through the on-off switch, the EMI filter circuit, the rectification filter circuit, the voltage reduction circuit and the rectification output circuit are electrically connected in sequence, the rectification filter circuit, the voltage stabilizing circuit, the control circuit and the voltage reduction circuit form a closed loop circuit, and the rectification output circuit is electrically connected with the LED light source assembly.
In one embodiment, the EMI filter circuit includes a first capacitor, a second capacitor, a third capacitor, and a common mode inductor, wherein the first capacitor is connected in series with the second capacitor to form a capacitor bank, and the capacitor bank is connected in parallel with the third capacitor to form a first differential mode inductor.
In one embodiment, the rectifying and filtering circuit includes a rectifying bridge, a first thin film capacitor, a second thin film capacitor, and a second differential mode inductor, the rectifying bridge is connected to the EMI filtering circuit, the second differential mode inductor is connected to the rectifying bridge, a first end of the first thin film capacitor is connected to a first end of the second differential mode inductor, a first end of the second thin film capacitor is connected to a second end of the second differential mode inductor, and second ends of the first thin film capacitor and the second thin film capacitor are both grounded.
In one embodiment, the voltage reduction circuit comprises a voltage reduction inductor, an IC chip, a first resistor, a second resistor, a fourth capacitor, a first MOS (metal oxide semiconductor) tube, a first rectifying diode and a first voltage stabilizing diode, the source electrode of the first MOS tube is connected with the IC chip, the drain electrode of the first MOS tube is connected with the step-down inductor, the grid electrode of the first MOS tube is connected with the second end of a first resistor, the first end of the first resistor is connected with the second resistor, the first end of the fourth capacitor is connected with the second resistor, the second end of the fourth capacitor is grounded, the output end of the first rectifying diode is connected with the first end of the first resistor, the input end of the first rectifying diode is connected with the source electrode of the first MOS tube, the output end of the first voltage stabilizing diode is connected with the grid electrode of the first MOS tube, and the input end of the first voltage stabilizing diode is connected with the second end of the fourth capacitor.
In one embodiment, the rectification output circuit comprises a second rectification diode, a third rectification diode, a first electrolytic capacitor and a second electrolytic capacitor, the second rectification diode is connected with the third rectification diode in parallel, and the first electrolytic capacitor is connected with the second electrolytic capacitor in parallel.
In one embodiment, the voltage stabilizing circuit comprises an inductance auxiliary winding, a first triode, a fourth rectifier diode, a second voltage stabilizing diode, a third resistor, a fourth resistor, a first capacitor, a second capacitor, a third electrolytic capacitor and a fourth electrolytic capacitor, the inductance auxiliary winding is used for providing induction voltage, the input end of the fourth rectifier diode is connected with the inductance auxiliary winding, the output end of the fourth rectifier diode is connected with the first end of the third resistor, the second end of the third resistor is connected with the collector electrode of the first triode, the first end of the fourth resistor is connected with the output end of the fourth rectifier diode, the second end of the fourth resistor is connected with the base electrode of the first triode, the base electrode of the first triode is connected with the output end of the second voltage stabilizing diode, the input end of the second voltage stabilizing diode is grounded, the positive electrode of the third electrolytic capacitor is connected with the first end of the third resistor, the first capacitor is connected with the third electrolytic capacitor in parallel, the positive electrode of the fourth electrolytic capacitor is connected with the emitter of the first triode, and the second capacitor is connected with the fourth electrolytic capacitor in parallel.
In one embodiment, the control circuit includes an IC chip, an MCU, a fifth resistor, a first resistor group, a second resistor group, and a second MOS transistor, where the fifth resistor is used to divide an input voltage and input the divided voltage to the MCU as a determination signal, a gate of the second MOS transistor is connected to the MCU, the first resistor group and the second resistor group include three resistors connected in parallel, a first end of the first resistor group and a first end of the second resistor group are both connected to the IC chip, a second end of the first resistor group is connected to a source of the second MOS transistor, and a second end of the second resistor group is connected to a drain of the second MOS transistor.
In one embodiment, the control circuit further includes a first optocoupler, a second triode, a third zener diode, a sixth resistor, a seventh resistor, a third MOS transistor, and a fourth MOS transistor, the first optocoupler is connected to the MCU, a first end of the sixth resistor is connected to the rectification output circuit, a drain of the third MOS transistor is connected to the rectification output circuit, a first protection resistor is disposed between the drain of the third MOS transistor and the rectification output circuit, a gate of the third MOS transistor is connected to a second end of the sixth resistor, a source of the third MOS transistor is connected to the LED light source module, a first end of the seventh resistor is connected to the second end of the sixth resistor, a second end of the seventh resistor is grounded, a collector of the second triode is connected to the second end of the sixth resistor, an emitter of the second triode is grounded, a base of the second triode is connected to an input end of the third zener diode, the output end of the third voltage-stabilizing diode is connected with the grid electrode of the fourth MOS tube, the output end of the third voltage-stabilizing diode is connected with the first optical coupler, the drain electrode of the fourth MOS tube is connected with the rectification output circuit, a second protective resistor is arranged between the drain electrode of the fourth MOS tube and the rectification output circuit, and the source electrode of the fourth MOS tube is connected with the LED light source assembly.
In one embodiment, the control circuit further includes a second optical coupler, a third MOS transistor and a fourth MOS transistor, an input end of the second optical coupler is connected to a first pin of the MCU, an input end of the third optical coupler is connected to a second pin of the MCU, a drain of the third MOS transistor is connected to the rectification output circuit, a first protection resistor is disposed between the drain of the third MOS transistor and the rectification output circuit, a gate of the third MOS transistor is connected to an output end of the third optical coupler, a source of the third MOS transistor is connected to the LED light source assembly, a drain of the fourth MOS transistor is connected to the rectification output circuit, a second protection resistor is disposed between the drain of the fourth MOS transistor and the rectification output circuit, the gate of the fourth MOS transistor is connected to an output end of the second optical coupler, and a source of the fourth MOS transistor is connected to the LED light source assembly.
The control method of the lamp control system comprises the following steps:
the on-off switch is closed, and the lamp control system is electrified;
the LED light source component outputs a first color temperature and a first power;
the on-off switch is turned off, and the on-off switch is turned on after a time period t 1;
the control circuit outputs a second color temperature control signal according to the time period t1, and controls the LED light source assembly to output a second color temperature;
the control circuit outputs a second power control signal to adjust the brightness of the LED light source component;
the on-off switch is turned off, and the on-off switch is turned on after a time period t 2;
the control circuit outputs a third color temperature control signal according to the time period t2, and controls the LED light source assembly to output a third color temperature;
the control circuit outputs a third power control signal to adjust the brightness of the LED light source component.
The lamp control system provided by the invention can switch the color temperature of the LED light source component and adjust the brightness at the same time by controlling the off time of the on-off switch, can avoid the mutual interference of the color temperature adjustment and the brightness adjustment of the lamp, and has the advantages of easy control, simple circuit structure, convenient installation, low hardware cost and stable circuit operation.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles and effects of the invention.
Unless otherwise specified or defined, the same reference numerals in different figures refer to the same or similar features, and different reference numerals may be used for the same or similar features.
Fig. 1 is a flowchart illustrating a lamp control system according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a lamp control system according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of an EMI filter circuit in a lamp control system according to an embodiment of the invention.
Fig. 4 is a schematic structural diagram of a rectifying and filtering circuit in a lamp control system according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a voltage reduction circuit in a lamp control system according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a rectification output circuit in a lamp control system according to an embodiment of the present invention.
Fig. 7 is a schematic structural diagram of a voltage stabilizing circuit in a lamp control system according to an embodiment of the invention.
Fig. 8 is a schematic structural diagram of a control circuit in a lamp control system according to an embodiment of the present invention.
Fig. 9 is a schematic structural diagram of a control circuit in a second lamp control system according to an embodiment of the present invention.
Description of reference numerals:
10. a light source assembly; 20. an AC input terminal; 30. an EMI filter circuit; 40. a rectification filter circuit; 50. a voltage reduction circuit; 60. a rectification output circuit; 70. a voltage stabilizing circuit; 80. a control circuit.
Detailed Description
In order to facilitate an understanding of the invention, specific embodiments thereof will be described in more detail below with reference to the accompanying drawings.
Unless specifically stated or otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In the case of combining the technical solutions of the present invention in a realistic scenario, all technical and scientific terms used herein may also have meanings corresponding to the purpose of achieving the technical solutions of the present invention.
As used herein, unless otherwise specified or defined, "first" and "second" … are used merely for name differentiation and do not denote any particular quantity or order.
As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items, unless specified or otherwise defined.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present; when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present; when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present.
As used herein, unless otherwise specified or defined, the terms "comprises," "comprising," and "comprising" are used interchangeably to refer to the term "comprising," and are used interchangeably herein.
It is needless to say that technical contents or technical features which are contrary to the object of the present invention or clearly contradicted by the object of the present invention should be excluded.
The first embodiment is as follows:
as shown in fig. 1 to 8, the present embodiment discloses a lamp control system, which includes an LED light source assembly 10, an AC input terminal 20, an on-off switch, an EMI filter circuit 30, a rectifying filter circuit 40, a voltage reduction circuit 50, a rectifying output circuit 60, a voltage stabilizing circuit 70, and a control circuit 80, where the EMI filter circuit 30 is connected to the AC input terminal 20 through the on-off switch to access a commercial power AC, the EMI filter circuit 30, the rectifying filter circuit 40, the voltage reduction circuit 50, and the rectifying output circuit 60 are electrically connected in sequence, the rectifying filter circuit 40, the voltage stabilizing circuit 70, the control circuit 80, and the voltage reduction circuit 50 form a closed loop circuit, and the rectifying output circuit 60 is electrically connected to the LED light source assembly 10. By controlling the off-time of the on-off switch, the brightness is adjusted while the color temperature of the LED light source component 10 is switched, the mutual interference of the color temperature adjustment and the brightness adjustment of the lamp can be avoided, the control is easy to realize, the circuit structure is simple, the installation is convenient, the hardware cost is low, and the circuit works stably.
The LED light source assembly 10 comprises a PCB lamp panel and an LED mounted on the PCB lamp panel; the on-off switch is a device for realizing the disconnection of a connecting wire, and can be a single-pole single-throw switch, a single-pole double-throw switch, a push-button switch, a toggle switch, a wall-type switch, a remote control switch and the like according to actual needs.
As shown in fig. 3, the EMI filter circuit 30 includes a first capacitor Y1, a second capacitor Y2, a third capacitor X1, a common mode inductor L1, and the like, where the first capacitor Y1 and the second capacitor Y2 are connected in series to form a capacitor bank, the capacitor bank is connected in parallel with the third capacitor X1 to form a first differential mode inductor, a voltage dependent resistor 7D271 for a protection circuit is connected in parallel with the third capacitor X1, and a ground is connected between the first capacitor Y1 and the second capacitor Y2. Through the arrangement, differential mode interference and common mode interference in the circuit are filtered, and performance reduction of a circuit system after interference is avoided.
As shown in fig. 4, the rectifying and filtering circuit 40 includes a rectifying bridge BR1, a first thin film capacitor C1, a second thin film capacitor C2, a second differential mode inductor L6, and the like, the rectifying bridge BR1 is connected to a common mode inductor L1 at two connecting points where the positive electrode and the negative electrode are connected, so as to connect to the EMI filter circuit 30, the positive electrode connecting point of the rectifying bridge BR1 is grounded, the second differential mode inductor L6 is connected to the negative electrode connecting point of the rectifying bridge BR1, a resistor R0 is connected between the second differential mode inductor L6 and the rectifying bridge BR1, the second differential mode inductor L6 is connected in parallel to a resistor R1, the first end of the first thin film capacitor C1 is connected to the first end of the second differential mode inductor L6, the first end of the second thin film capacitor C2 is connected to the second end of the second differential mode inductor L6, the first ends of the first thin film capacitor C1 and the second thin film capacitor C2 are connected in parallel to the first end of the thin film capacitor C467, the film capacitor C3 is connected in series with the resistor R2 and then connected in parallel with the film capacitor C2. Through the arrangement, the circuit system is rectified, the ripple is filtered, the power factor is improved, and the problem that the power efficiency and the LED lighting effect are reduced due to the fact that the output power is too small is solved.
As shown in fig. 5, the voltage-reducing circuit 50 includes a voltage-reducing inductor T1, an IC chip U1, a first resistor R54, a second resistor R56, a fourth capacitor C33, a first MOS transistor M1, a first rectifying diode D9, a first zener diode Z3, and the like, the IC chip U1 may employ iw3689, a source of the first MOS transistor M1 is connected to the pin 6 of the IC chip U1, and is connected to the capacitor C30 and then grounded, a drain of the first MOS transistor M1 is connected to the second end of the voltage-reducing inductor T1, a gate of the first MOS transistor M1 is connected to the second end of the first resistor R54, a first end of the first resistor R5 is connected to the second end of the second resistor 56, a first end of the second resistor M56 is connected to the second end of the second differential mode inductor L6, a first end of the fourth capacitor C33 is connected to the second end of the second resistor R56, a first end of the fourth capacitor C639 is connected to the first rectifying diode R599 and the second end of the rectifying diode Z7379, an input end of the first rectifying diode Z3 is connected with a source electrode of a first MOS transistor M1, an output end of the first voltage stabilizing diode Z3 is connected with a gate electrode of the first MOS transistor M1, an input end of the first voltage stabilizing diode Z3 is connected with a second end of a fourth capacitor C33, in addition, first ends of a resistor R56 and a buck inductor T1 are connected with a bus, the bus is connected with HV +, a pin 1 of an IC chip U1 is respectively connected with two connection points of a rectifier bridge BR1, the two connection points are respectively connected with a resistor R60 and a resistor R62, a pin 2 of an IC chip U1 is connected with a resistor R59 and a capacitor C35 in sequence and then connected with a resistor R60, a resistor R59 is connected with a capacitor C34 in parallel, a pin 3 of the IC chip U1 is connected with an electrolytic capacitor C1, the capacitor C1 is connected with an electrolytic capacitor C1 in parallel, a pin 4 of the IC chip U1 is grounded, the capacitor C1, the resistor R1 is connected with the electrolytic capacitor C1, the, The other end of the capacitor C28 is grounded, and a pin 8 of the IC chip U1 is connected with the resistor R49 and the resistor R51 which are connected in series and then connected to the bus. Through the arrangement, the constant current of the circuit can be kept, the overvoltage, overcurrent and overtemperature of the circuit are protected, the IC chip U1 and the first MOS tube M1 play a role in switching control, when the IC chip U1 and the first MOS tube M1 are switched on, the voltage reduction inductor T1 stores energy, and when the first MOS tube M1 is switched off, the voltage reduction inductor T1 releases energy.
As shown in fig. 6, the rectification output circuit 60 includes a second rectification diode D3, a third rectification diode D5, a first electrolytic capacitor EC1, a second electrolytic capacitor EC2, etc., the second rectification diode D3 is connected in parallel with the third rectification diode D5, the first electrolytic capacitor EC1 is connected in parallel with the second electrolytic capacitor EC2, an input end of the second rectification diode D3 is connected with a drain of the first MOS transistor M1, an input end of the third rectification diode D5 is connected with an input end of the second rectification diode D3, and is connected with a resistor R48 and a resistor R50 connected in series and then connected with a pin 7 of the IC chip U1, anodes of the first electrolytic capacitor EC1 and the second electrolytic capacitor EC2 are both connected with an output end of the second rectification diode D3, cathodes of the first electrolytic capacitor EC1 and the second electrolytic capacitor 2 are both connected with a bus, an output end of the second rectification diode D3 is connected with N + 3, V + is connected with N + 67v + N, the first end of the capacitor C12 is connected to the output end of the second rectifying diode D3, and the second end of the capacitor C12 is grounded. After the rectifier diode converts alternating current into direct current, filtering is performed through an electrolytic capacitor to supply power to the LED light source assembly 10; the second rectifying diode D3 and the third rectifying diode D5 are connected in parallel to bear larger current and play a role in shunting current when one diode is damaged and the other diode can enable the circuit to continue to work.
In addition, a first end of the resistor R61 is connected to a second end of the buck inductor T1, a first end of the resistor R61 is connected to a first end of the capacitor C31, a second end of the capacitor C31 is connected to the resistor R18 and then connected to the bus, and a second end of the capacitor C31 is connected to an output end of the second rectifier diode D3. The resistor R61, the capacitor C31 and the resistor R18 form a bleeder circuit, the resistor R18 is a dummy load, and the resistor R61 and the capacitor C13 play a role in clamping.
As shown in fig. 7, the voltage regulator circuit 70 includes an inductive auxiliary winding T2A, a first triode Q4, a fourth rectifying diode D4, a second zener diode ZD2, a third resistor R20, a fourth resistor R21, a first capacitor C8, a second capacitor C9, a third electrolytic capacitor EC4, a fourth electrolytic capacitor EC5, and so on, the inductive auxiliary winding T2A is used for providing an induced voltage, an input terminal of the fourth rectifying diode D4 is connected to the inductive auxiliary winding T2A, an output terminal of the fourth rectifying diode D4 is connected to a first terminal of the third resistor R20, a second terminal of the third resistor R20 is connected to a collector of the first triode Q4, a first terminal of the fourth resistor R21 is connected to an output terminal of the fourth rectifying diode D4, a second terminal of the fourth resistor R21 is connected to a base of the first triode Q4, a base of the first triode Q4 is connected to an output terminal of the second zener diode ZD2, the input end of the second zener diode ZD4 is grounded, the anode of the third electrolytic capacitor EC4 is connected to the first end of the third resistor R20, the first capacitor C8 is connected in parallel with the third electrolytic capacitor EC4, the anode of the fourth electrolytic capacitor EC5 is connected to the emitter of the first triode Q4, the emitter of the first triode Q4 is connected to the pin 1 of the MCU in the control circuit 80, the second capacitor C9 is connected in parallel with the fourth electrolytic capacitor EC5, and the cathodes of the third electrolytic capacitor EC4 and the fourth electrolytic capacitor EC5 are both grounded. In this voltage stabilizing circuit 70, the resistor functions as voltage division, the capacitor functions as filtering, the fourth rectifier diode D4 functions as rectification, the second voltage stabilizing diode ZD2 functions as voltage stabilization, and the first triode Q4 functions as voltage stabilization, so as to provide stable voltage for the rear-end control circuit 80.
As shown in fig. 8, the control circuit 80 includes an IC chip U1, an MCU, a fifth resistor R22, a first resistor group, a second resistor group, and a second MOS transistor Q1, and it should be noted that the IC chip U1 in the control circuit 80 and the IC chip U1 in the step-down circuit 50 are the same chip, the MCU may employ FT60F011A, the gate of the second MOS transistor Q1 is connected to a pin 6 of the MCU, the first resistor group and the second resistor group each include three resistors connected in parallel, wherein the first resistor group includes a resistor R14, a resistor R15, and a resistor R16, the second resistor group includes a resistor R12, a resistor R13, and a resistor R18, the first end of the first resistor group and the first end of the second resistor group are both connected to a pin 5 of the IC chip U1, the second end of the first resistor group is connected to a source of the second MOS transistor Q1, the second end of the second resistor group is connected to a source of the second transistor Q1, and the second resistor R5966 is connected to a drain of the MCU, one end of a resistor R3 is connected with a bus, a resistor R3 is connected with a resistor R4 in series and then connected with a fifth resistor R22, the first end of the fifth resistor R22 is also connected with a pin 7 of the MCU, the second end of the fifth resistor R22 and a pin 8 of the MCU are both grounded, the output end of a voltage stabilizing diode ZD3 is connected with the first end of the fifth resistor R22, the input end of the voltage stabilizing diode ZD3 is grounded, the fifth resistor R22 is also connected with a capacitor C10 in parallel, the voltage stabilizing diode ZD3 plays roles of rectification and voltage stabilization, the capacitor C10 plays a role of filtering, and the fifth resistor R22 is used for dividing an input voltage and then inputting the divided voltage into the MCU as a judgment signal. Through the arrangement, when the on-off switch realizes the connection and disconnection of the circuit, the level of the resistor R22 can be changed, when the level of the resistor R22 is changed to reach a set value, the MCU outputs a power control signal, changes the level on the pin 6 to drive the source electrode of the second MOS transistor Q1, so that the second resistor group is connected with the first resistor group in parallel, the size of the power resistor of the IC chip U1 is changed, the output power is changed, and the output brightness is changed.
The control circuit 80 further includes a first optical coupler U3, a second triode Q5, a third zener diode ZD4, a sixth resistor R26, a seventh resistor R27, an eighth resistor R25, a third MOS transistor Q2, and a fourth MOS transistor Q3, the first optical coupler U3 is connected to the pin 5 of the MCU, a first end of the sixth resistor R26 is connected to an output end of the second rectifying diode D3 of the rectifying output circuit 60, a drain of the third MOS transistor Q2 is connected to an output end of the second rectifying diode D3 through a first protection resistor R28, a drain of the third MOS transistor Q2 is connected to the first protection resistor R28 through an N-, a gate of the third MOS transistor Q2 is connected to a second end of the sixth resistor R26, a source of the third MOS transistor Q2 is connected to the LED light source assembly 10, a first end of the seventh resistor R5 is connected to the second end of the sixth resistor R26, and a second end of the seventh resistor R57324 is grounded, the collector of the second triode Q5 is connected with the second end of a sixth resistor R26, the emitter of the second triode Q5 is grounded, the base of the second triode Q5 is connected with the input end of a third zener diode ZD4, the output end of the third zener diode ZD4 is connected with a pin DM1, the output end of the third zener diode ZD4 is further connected with a first optocoupler U3, a pin DM1 is connected with the gate of a fourth MOS transistor Q3, the first end of an eighth resistor R25 is connected with the first end of the sixth resistor R26, the second end of the eighth resistor R25 is connected with a pin DM1, the drain of the fourth MOS transistor Q3 is connected with V + after passing through a second protection resistor R29, and the source of the fourth MOS transistor is connected with the LED light source assembly 10. The fifth resistor R22 divides the input voltage and inputs the divided voltage into the MCU as a judgment signal, after the on-off switch is disconnected and then connected, the MCU outputs different PWM signals to different MOS tubes through the first optical coupler U3 according to different disconnection times so as to control the lighting or extinguishing of different color temperatures of the LED light source assembly 10, wherein, the MCU detects the level change of the fifth resistor R22 by arranging the second triode Q5, the third voltage stabilizing diode ZD4, the sixth resistor R26, the seventh resistor R27 and the eighth resistor R25 to play a role of conversion, the level of the pin 5 is changed and the on-off of the first optical coupler U3 is controlled, when the first optical coupler U3 is coupled, the pin DM 39DM 38 is pulled down to the ground, so the third MOS tube Q6348 is connected, when the first optical coupler U3 is disconnected, the third voltage stabilizing diode ZD2 behind the pin DM1 is reversely broken down, the voltage of the pin DM 8 is clamped, the second triode Q5 is connected, and the sixth voltage dividing resistor R26 and the seventh resistor R27 is pulled down to the ground, therefore, the fourth MOS transistor Q3 is turned on.
The embodiment also discloses a control method of the lamp control system, which comprises the following steps:
the on-off switch is closed, and the lamp control system is electrified;
the LED light source assembly 10 outputs a first color temperature and a first power, wherein the first color temperature is 3000K, and the first power is 10W;
the on-off switch is turned off, and the on-off switch is turned on after a time period t 1; wherein t1 is more than 0s and less than 3 s;
the control circuit 80 outputs a second color temperature control signal according to the time period t1, and controls the LED light source assembly 10 to output a second color temperature 2000K;
the control circuit 80 outputs a second power control signal to adjust the brightness of the LED light source assembly 10 and the second power of the LED light source assembly 10 is 5W;
the on-off switch is turned off, and the on-off switch is turned on after a time period t 2; wherein t2 is more than 3 s;
the control circuit 80 outputs a third color temperature control signal according to the time period t2, and controls the LED light source assembly 10 to output a third color temperature 5000K;
the control circuit 80 outputs a third power control signal to adjust the brightness of the LED light source assembly 10 and the third power 10W of the LED light source assembly 10.
It should be noted that the color temperature and the power control signal are both PWM signals output by the MCU. The control method is simple, the color temperature of the LED light source assembly 10 can be easily adjusted, meanwhile, the brightness can be adjusted, the control method is not interfered with each other, and more lighting effect requirements can be met.
Example two:
the present embodiment also discloses a lamp control system, which is different from the first embodiment in that:
as shown in fig. 9, the color temperature control portion of the control circuit 80 includes a second optical coupler U3, a third optical coupler U4, a third MOS transistor Q2 and a fourth MOS transistor Q3, an input end of the second optical coupler U3 is connected to a pin 5 of the MCU, an input end of the third optical coupler U4 is connected to a pin 4 of the MCU, a drain of the third MOS transistor Q2 is connected to an output end of a second rectifier diode D3 through a first protection resistor R28, a drain of the third MOS transistor Q2 is further connected to an N-terminal between the drain of the third MOS transistor Q28 and a first protection resistor R28, a gate of the third MOS transistor Q2 is connected to a pin DM2, a pin DM2 is connected to an output end of the third optical coupler U4, a source of the third MOS transistor Q2 is connected to the LED light source assembly 10, a drain of the fourth MOS transistor Q3 is connected to V + through a second protection resistor R29, a gate of the fourth MOS transistor Q3 is connected to a pin DM1, and a pin 5857324 is connected to an output end of the second optical coupler U58573, the source of the fourth MOS transistor Q3 is connected to the LED light source assembly 10. The MCU detects the change of the level of the fifth resistor R22, the level of the pin 4 or the pin 5 is changed according to the change of the level of the fifth resistor R22, the on-off of the second optical coupler U3 and the third optical coupler U4 is controlled, the on-off of the third MOS transistor Q2 and the fourth MOS transistor Q3 is controlled, different color temperatures are switched, when the pin 4 is electrified, the third MOS transistor Q2 is conducted, and when the pin 5 is electrified, the fourth MOS transistor Q3 is conducted.
According to the lamp control system, after the on-off switch is disconnected and then connected, the MCU outputs different PWM signals to different MOS tubes through the optical coupler according to different disconnection times, so that different color temperatures of the LED light source component are controlled to be turned on or turned off; meanwhile, the LED driving circuit has the capability of adjusting the output brightness, the MCU outputs a PWM signal to control the mos tube to be switched on and off so as to increase the size of a power resistor of an IC chip in the voltage reduction circuit and form the switching of large and small output current, the control method is simple, effective and easy to realize, in addition, the circuit structure is simple, the hardware cost is low, and the work is stable; the lamp control system is suitable for lamps requiring different color temperatures and brightness in different occasions, and meets more lighting effect requirements.
The rest of this embodiment can partially refer to embodiment one, and will not be described herein again.
The above embodiments are provided to illustrate, reproduce and deduce the technical solutions of the present invention, and to fully describe the technical solutions, the objects and the effects of the present invention, so as to make the public more thoroughly and comprehensively understand the disclosure of the present invention, and not to limit the protection scope of the present invention.
The above examples are not intended to be exhaustive of the invention and there may be many other embodiments not listed. Any alterations and modifications without departing from the spirit of the invention are within the scope of the invention.

Claims (10)

1. The lamp control system is characterized by comprising an LED light source assembly, an AC input end, an on-off switch, an EMI filter circuit, a rectification filter circuit, a voltage reduction circuit, a rectification output circuit, a voltage stabilizing circuit and a control circuit, wherein the EMI filter circuit is connected with the AC input end through the on-off switch, the EMI filter circuit, the rectification filter circuit, the voltage reduction circuit and the rectification output circuit are electrically connected in sequence, the rectification filter circuit, the voltage stabilizing circuit, the control circuit and the voltage reduction circuit form a closed loop circuit, and the rectification output circuit is electrically connected with the LED light source assembly.
2. The lamp control system of claim 1 wherein the EMI filter circuit comprises a first capacitor, a second capacitor, a third capacitor, and a common mode inductor, wherein the first capacitor is connected in series with the second capacitor to form a capacitor bank, and wherein the capacitor bank is connected in parallel with the third capacitor to form a first differential mode inductor.
3. The lamp control system of claim 1, wherein the rectifying and filtering circuit comprises a rectifying bridge, a first thin film capacitor, a second thin film capacitor, and a second differential mode inductor, the rectifying bridge is connected to the EMI filtering circuit, the second differential mode inductor is connected to the rectifying bridge, a first end of the first thin film capacitor is connected to a first end of the second differential mode inductor, a first end of the second thin film capacitor is connected to a second end of the second differential mode inductor, and second ends of the first thin film capacitor and the second thin film capacitor are both grounded.
4. The lamp control system of claim 1, wherein the buck circuit comprises a buck inductor, an IC chip, a first resistor, a second resistor, a fourth capacitor, a first MOS transistor, a first rectifying diode, and a first zener diode, the source electrode of the first MOS tube is connected with the IC chip, the drain electrode of the first MOS tube is connected with the step-down inductor, the grid electrode of the first MOS tube is connected with the second end of a first resistor, the first end of the first resistor is connected with the second resistor, the first end of the fourth capacitor is connected with the second resistor, the second end of the fourth capacitor is grounded, the output end of the first rectifying diode is connected with the first end of the first resistor, the input end of the first rectifying diode is connected with the source electrode of the first MOS tube, the output end of the first voltage stabilizing diode is connected with the grid electrode of the first MOS tube, and the input end of the first voltage stabilizing diode is connected with the second end of the fourth capacitor.
5. The lamp control system of claim 1 wherein said rectified output circuit comprises a second rectifying diode, a third rectifying diode, a first electrolytic capacitor and a second electrolytic capacitor, said second rectifying diode being connected in parallel with said third rectifying diode, said first electrolytic capacitor being connected in parallel with said second electrolytic capacitor.
6. The lamp control system of claim 1, wherein the voltage regulator circuit comprises an inductive auxiliary winding, a first triode, a fourth rectifying diode, a second voltage regulator diode, a third resistor, a fourth resistor, a first capacitor, a second capacitor, a third electrolytic capacitor, and a fourth electrolytic capacitor, the inductive auxiliary winding is used for providing an induced voltage, an input terminal of the fourth rectifying diode is connected with the inductive auxiliary winding, an output terminal of the fourth rectifying diode is connected with a first terminal of the third resistor, a second terminal of the third resistor is connected with a collector of the first triode, a first terminal of the fourth resistor is connected with an output terminal of the fourth rectifying diode, a second terminal of the fourth resistor is connected with a base of the first triode, a base of the first triode is connected with an output terminal of the second voltage regulator diode, an input terminal of the second voltage regulator diode is grounded, the positive electrode of the third electrolytic capacitor is connected with the first end of the third resistor, the first capacitor is connected with the third electrolytic capacitor in parallel, the positive electrode of the fourth electrolytic capacitor is connected with the emitter of the first triode, and the second capacitor is connected with the fourth electrolytic capacitor in parallel.
7. The lamp control system of claim 1, wherein the control circuit comprises an IC chip, an MCU, a fifth resistor, a first resistor group, a second resistor group, and a second MOS transistor, the fifth resistor is used to divide an input voltage and input the divided voltage to the MCU as a determination signal, the gate of the second MOS transistor is connected to the MCU, the first resistor group and the second resistor group each comprise three resistors connected in parallel, the first end of the first resistor group and the first end of the second resistor group are both connected to the IC chip, the second end of the first resistor group is connected to the source of the second MOS transistor, and the second end of the second resistor group is connected to the drain of the second MOS transistor.
8. The lamp control system of claim 7, wherein the control circuit further comprises a first optocoupler, a second triode, a third zener diode, a sixth resistor, a seventh resistor, a third MOS transistor, and a fourth MOS transistor, the first optocoupler is connected to the MCU, a first end of the sixth resistor is connected to the rectified output circuit, a drain of the third MOS transistor is connected to the rectified output circuit, a first protection resistor is disposed between the drain of the third MOS transistor and the rectified output circuit, a gate of the third MOS transistor is connected to a second end of the sixth resistor, a source of the third MOS transistor is connected to the LED light source assembly, a first end of the seventh resistor is connected to a second end of the sixth resistor, a second end of the seventh resistor is grounded, a collector of the second triode is connected to the second end of the sixth resistor, and an emitter of the second triode is grounded, the base of second triode is connected with the input of third zener diode, the output of third zener diode is connected with the grid of fourth MOS pipe, just the output and the first opto-coupler of third zener diode are connected, the drain electrode and the rectification output circuit of fourth MOS pipe are connected, just be equipped with second protective resistor between the drain electrode of fourth MOS pipe and the rectification output circuit, the source electrode and the LED light source subassembly of fourth MOS pipe are connected.
9. The lamp control system of claim 7, wherein the control circuit further comprises a second optocoupler, a third MOS transistor, and a fourth MOS transistor, the input end of the second optocoupler is connected with a first pin of the MCU, the input end of the third optocoupler is connected with a second pin of the MCU, the drain electrode of the third MOS transistor is connected with the rectification output circuit, a first protection resistor is arranged between the drain electrode of the third MOS tube and the rectification output circuit, the grid electrode of the third MOS tube is connected with the output end of the third optocoupler, the source electrode of the third MOS tube is connected with the LED light source component, the drain electrode of the fourth MOS tube is connected with the rectification output circuit, and a second protection resistor is arranged between the drain electrode of the fourth MOS tube and the rectification output circuit), the grid electrode of the fourth MOS tube is connected with the output end of the second optical coupler, and the source electrode of the fourth MOS tube is connected with the LED light source assembly.
10. The control method of the lamp control system is characterized by comprising the following steps:
the on-off switch is closed, and the lamp control system is electrified;
the LED light source component outputs a first color temperature and a first power;
the on-off switch is turned off, and the on-off switch is turned on after a time period t 1;
the control circuit outputs a second color temperature control signal according to the time period t1, and controls the LED light source assembly to output a second color temperature;
the control circuit outputs a second power control signal to adjust the brightness of the LED light source component;
the on-off switch is turned off, and the on-off switch is turned on after a time period t 2;
the control circuit outputs a third color temperature control signal according to the time period t2, and controls the LED light source assembly to output a third color temperature;
the control circuit outputs a third power control signal to adjust the brightness of the LED light source component.
CN202011383308.0A 2020-12-01 2020-12-01 Lamp control system and control method thereof Pending CN112512159A (en)

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