CN204465954U - A kind of LED lamp drive circuit with dimming function - Google Patents

A kind of LED lamp drive circuit with dimming function Download PDF

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Publication number
CN204465954U
CN204465954U CN201520083401.8U CN201520083401U CN204465954U CN 204465954 U CN204465954 U CN 204465954U CN 201520083401 U CN201520083401 U CN 201520083401U CN 204465954 U CN204465954 U CN 204465954U
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China
Prior art keywords
resistance
pin
connects
electric capacity
amplifier
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Expired - Fee Related
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CN201520083401.8U
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Chinese (zh)
Inventor
翁志刚
程颖
翁志远
孔敏
秦广龙
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ANHUI KEFA NEWS SCIENCE AND TECHNOLOGY Ltd
West Anhui University
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ANHUI KEFA NEWS SCIENCE AND TECHNOLOGY Ltd
West Anhui University
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Priority to CN201520083401.8U priority Critical patent/CN204465954U/en
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40Control techniques providing energy savings, e.g. smart controller or presence detection

Abstract

The utility model discloses a kind of LED lamp drive circuit with dimming function, comprise gray value Acquisition Circuit, STC89C51 single-chip microcomputer, power circuit and control circuit, described power circuit comprises rectifier bridge T, transformer W and electric capacity C1, and described control circuit comprises amplifier IC2, amplifier IC3 and metal-oxide-semiconductor Q2.The utility model LED drive circuit controls using single-end flyback switching power supply as prime, and linear pressure-controlled constant-current source is as the rear class controlled.Make constant-current source accurately at the input voltage changing its constant-current source in a big way, efficiency and precision can be improve while control LED, meanwhile, the not fragile LED of two-step evolution, therefore this circuit have that efficiency is high, stable performance, long service life advantage.

Description

A kind of LED lamp drive circuit with dimming function
Technical field
The utility model relates to a kind of LED circuit, specifically a kind of LED lamp drive circuit with dimming function.
Background technology
LED is acknowledged as green forth generation light source, is a kind of solid cold light source, has the plurality of advantages such as efficient, life-span length, safety and environmental protection, volume are little, high reliability, fast response time.Reach same illuminating effect at present, the power consumption of LED is approximately 1/10 of incandescent lamp, 1/2 of fluorescent lamp, LED drive circuit is concerning most important LED, and LED brightness adjustment control can be energy-conservation, the driving of high-brightness white-light LED and light modulation are the focuses of Recent study, traditional LED drive circuit uses Switching Power Supply to control mostly, what Switching Power Supply actual feedback controlled is output voltage, control not too easily to accomplish accurately to output current, and fragile LED when simplex switch Energy control has a deviation, linear circuit efficiency are not high.
Utility model content
The purpose of this utility model is to provide that a kind of efficiency is high, the LED lamp drive circuit with dimming function of stable performance, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the utility model provides following technical scheme:
A kind of LED lamp drive circuit with dimming function, comprise gray value Acquisition Circuit, STC89C51 single-chip microcomputer, power circuit and control circuit, described power circuit comprises rectifier bridge T, transformer W and electric capacity C1, and described control circuit comprises amplifier IC2, amplifier IC3 and metal-oxide-semiconductor Q2;
1 port and 3 ports of described rectifier bridge T are connected the two ends of 220V alternating current respectively, 2 ports of rectifier bridge T connect the winding L 1 of electric capacity C1 and transformer W, 2 ports of rectifier bridge T connect the other end of electric capacity C1 and the source electrode of metal-oxide-semiconductor Q1, the other end of the winding L 1 of the drain electrode connection transformer W of metal-oxide-semiconductor Q1, the grid of metal-oxide-semiconductor Q1 connects the output of isolated drive circuit, one end of the winding L 2 of transformer W connects the anode of diode D1, the negative electrode of diode D1 connects electric capacity C2 and LED lamp H, the other end of electric capacity C2 connects electric capacity C3, the other end of the winding L 2 of transformer W and the winding L 3 of transformer W, the other end of the winding L 3 of transformer W connects the anode of diode D2, the negative electrode contact resistance R1 of diode D2, the other end of resistance R2 and electric capacity C3, the other end of resistance R2 connects 1 pin of three end adjustable reference source P and 1 pin with door chip IC 1, the P1.3 pin of STC89C51 single-chip microcomputer is connected with 2 pin of door chip IC 1, the input of isolated drive circuit is connected with 3 pin of door chip IC 1, the 2 pin contact resistance R3 of three end adjustable reference source P ground connection, the other end of 3 pin contact resistance R1 of three end adjustable reference source P and the other end of resistance R3, the P3.2 pin of STC89C51 single-chip microcomputer connects gray value Acquisition Circuit, the P1.0 pin contact resistance R6 of STC89C51 single-chip microcomputer, the other end of resistance R6 connects electric capacity C4, the other end contact resistance R7 of electric capacity C4, R9 ~ R12 and electric capacity C5 ground connection, the other end contact resistance R4 of resistance R10, resistance R5, 3 pin of amplifier IC3 and the P3.3 pin of STC89C51 single-chip microcomputer, the other end of resistance R4 connects 1 pin of amplifier IC2, the other end of resistance R4 connects 1 pin of amplifier IC3 and the other end of resistance R7, 2 pin of amplifier IC3 connect the other end and the resistance R8 of electric capacity C5, the other end of resistance R9 connects 2 pin of amplifier IC2, the other end of 3 pin contact resistance R11 of amplifier IC2 and the grid of metal-oxide-semiconductor Q2, the other end of resistance R8 connects the source electrode of metal-oxide-semiconductor Q2 and the other end of resistance R12, the drain electrode of metal-oxide-semiconductor Q2 connects the other end of LED lamp H.
As preferred version of the present utility model: the model of described amplifier IC2 and IC3 is LM311.
As preferred version of the present utility model: described isolated drive circuit is the isolation drive module centered by 4N25 optical coupler.
Compared with prior art, the beneficial effects of the utility model are: the utility model LED drive circuit controls using single-end flyback switching power supply as prime, and linear pressure-controlled constant-current source is as the rear class controlled.Make constant-current source accurately at the input voltage changing its constant-current source in a big way, efficiency and precision can be improve while control LED, meanwhile, the not fragile LED of two-step evolution, therefore this circuit have that efficiency is high, stable performance, long service life advantage.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the LED lamp drive circuit with dimming function;
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1, a kind of LED lamp drive circuit with dimming function, comprise gray value Acquisition Circuit, STC89C51 single-chip microcomputer, power circuit and control circuit, described power circuit comprises rectifier bridge T, transformer W and electric capacity C1, and described control circuit comprises amplifier IC2, amplifier IC3 and metal-oxide-semiconductor Q2;
1 port and 3 ports of described rectifier bridge T are connected the two ends of 220V alternating current respectively, 2 ports of rectifier bridge T connect the winding L 1 of electric capacity C1 and transformer W, 2 ports of rectifier bridge T connect the other end of electric capacity C1 and the source electrode of metal-oxide-semiconductor Q1, the other end of the winding L 1 of the drain electrode connection transformer W of metal-oxide-semiconductor Q1, the grid of metal-oxide-semiconductor Q1 connects the output of isolated drive circuit, one end of the winding L 2 of transformer W connects the anode of diode D1, the negative electrode of diode D1 connects electric capacity C2 and LED lamp H, the other end of electric capacity C2 connects electric capacity C3, the other end of the winding L 2 of transformer W and the winding L 3 of transformer W, the other end of the winding L 3 of transformer W connects the anode of diode D2, the negative electrode contact resistance R1 of diode D2, the other end of resistance R2 and electric capacity C3, the other end of resistance R2 connects 1 pin of three end adjustable reference source P and 1 pin with door chip IC 1, the P1.3 pin of STC89C51 single-chip microcomputer is connected with 2 pin of door chip IC 1, the input of isolated drive circuit is connected with 3 pin of door chip IC 1, the 2 pin contact resistance R3 of three end adjustable reference source P ground connection, the other end of 3 pin contact resistance R1 of three end adjustable reference source P and the other end of resistance R3, the P3.2 pin of STC89C51 single-chip microcomputer connects gray value Acquisition Circuit, the P1.0 pin contact resistance R6 of STC89C51 single-chip microcomputer, the other end of resistance R6 connects electric capacity C4, the other end contact resistance R7 of electric capacity C4, R9 ~ R12 and electric capacity C5 ground connection, the other end contact resistance R4 of resistance R10, resistance R5, 3 pin of amplifier IC3 and the P3.3 pin of STC89C51 single-chip microcomputer, the other end of resistance R4 connects 1 pin of amplifier IC2, the other end of resistance R4 connects 1 pin of amplifier IC3 and the other end of resistance R7, 2 pin of amplifier IC3 connect the other end and the resistance R8 of electric capacity C5, the other end of resistance R9 connects 2 pin of amplifier IC2, the other end of 3 pin contact resistance R11 of amplifier IC2 and the grid of metal-oxide-semiconductor Q2, the other end of resistance R8 connects the source electrode of metal-oxide-semiconductor Q2 and the other end of resistance R12, the drain electrode of metal-oxide-semiconductor Q2 connects the other end of LED lamp H.
The model of amplifier IC2 and IC3 is LM311.
Isolated drive circuit is the isolation drive module centered by 4N25 optical coupler.
Operation principle of the present utility model is: in Fig. 1, transformer W, metal-oxide-semiconductor Q1, diode D1 and electric capacity C1 form single-end flyback switching power supply; The devices such as amplifier IC2, IC3 and power tube Q2 form pressure-controlled constant-current source; STC89C51 single-chip microcomputer is kernel control chip.During gray-value variation, single-chip microcomputer produces a corresponding dimming control voltage according to its gray value obtained.Dimming control voltage is added in 1 pin of IC2, and 2 pin of IC2 are the current signals flowing through LED lamp obtained through IC3, and R12 is current sense resistor.The 3 pin output voltages of IC2 are the control voltage of metal-oxide-semiconductor Q2, from the empty short concept of operational amplifier, the reverse input voltage of IC2 will equal the voltage on its positive input, and electric current when namely stablizing on R12 by the control of dimming control voltage, and does not change with the change of load.Single-chip microcomputer also produces a pwm signal while producing a corresponding dimming control voltage according to its gray value obtained and is exported by P1.3, remove to control the switch of metal-oxide-semiconductor Q1 after signal on this pwm signal and three end adjustable reference source P meets, then single-chip microcomputer is according to the LED current signal obtained, change the duty ratio of pwm signal, change the output voltage of Switching Power Supply, also the input voltage namely changing constant-current source makes the voltage on power tube Q2 reduce, it is made to be operated in adjustable resistance district when output current is constant or close to adjustable resistance district, to raise the efficiency.The existence of three end adjustable shunt benchmark P and corresponding electric phase thereof is here the maximum output voltage in order to limit switch power supply, the fail safe of further raising system.When light is relatively better, single-chip microcomputer, according to the gray value obtained, controls the dimming control voltage that it exports, makes the output current of constant-current source relatively little, can reach energy-saving effect.Circuit controls using single-end flyback switching power supply as prime, and linear pressure-controlled constant-current source is as the rear class controlled.Civil power can obtain direct voltage output after single-ended flyback power conversion, and this output is as the input of the pressure-controlled constant-current source of rear class.Input voltage due to pressure-controlled constant-current source is powered by high efficiency single inverse-excitation type switch power-supply, pressure-controlled constant-current source accurately can at the input voltage changing its constant-current source in a big way while control LED, therefore efficiency and precision are all guaranteed, and can by mains-supplied.Meanwhile, the not fragile LED of two-step evolution.

Claims (3)

1., with a LED lamp drive circuit for dimming function, comprise gray value Acquisition Circuit, STC89C51 single-chip microcomputer, power circuit and control circuit; It is characterized in that, described power circuit comprises rectifier bridge T, transformer W and electric capacity C1, and described control circuit comprises amplifier IC2, amplifier IC3 and metal-oxide-semiconductor Q2;
1 port and 3 ports of described rectifier bridge T are connected the two ends of 220V alternating current respectively, 2 ports of rectifier bridge T connect the winding L 1 of electric capacity C1 and transformer W, 2 ports of rectifier bridge T connect the other end of electric capacity C1 and the source electrode of metal-oxide-semiconductor Q1, the other end of the winding L 1 of the drain electrode connection transformer W of metal-oxide-semiconductor Q1, the grid of metal-oxide-semiconductor Q1 connects the output of isolated drive circuit, one end of the winding L 2 of transformer W connects the anode of diode D1, the negative electrode of diode D1 connects electric capacity C2 and LED lamp H, the other end of electric capacity C2 connects electric capacity C3, the other end of the winding L 2 of transformer W and the winding L 3 of transformer W, the other end of the winding L 3 of transformer W connects the anode of diode D2, the negative electrode contact resistance R1 of diode D2, the other end of resistance R2 and electric capacity C3, the other end of resistance R2 connects 1 pin of three end adjustable reference source P and 1 pin with door chip IC 1, the P1.3 pin of STC89C51 single-chip microcomputer is connected with 2 pin of door chip IC 1, the input of isolated drive circuit is connected with 3 pin of door chip IC 1, the 2 pin contact resistance R3 of three end adjustable reference source P ground connection, the other end of 3 pin contact resistance R1 of three end adjustable reference source P and the other end of resistance R3, the P3.2 pin of STC89C51 single-chip microcomputer connects gray value Acquisition Circuit, the P1.0 pin contact resistance R6 of STC89C51 single-chip microcomputer, the other end of resistance R6 connects electric capacity C4, the other end contact resistance R7 of electric capacity C4, R9 ~ R12 and electric capacity C5 ground connection, the other end contact resistance R4 of resistance R10, resistance R5, 3 pin of amplifier IC3 and the P3.3 pin of STC89C51 single-chip microcomputer, the other end of resistance R4 connects 1 pin of amplifier IC2, the other end of resistance R4 connects 1 pin of amplifier IC3 and the other end of resistance R7, 2 pin of amplifier IC3 connect the other end and the resistance R8 of electric capacity C5, the other end of resistance R9 connects 2 pin of amplifier IC2, the other end of 3 pin contact resistance R11 of amplifier IC2 and the grid of metal-oxide-semiconductor Q2, the other end of resistance R8 connects the source electrode of metal-oxide-semiconductor Q2 and the other end of resistance R12, the drain electrode of metal-oxide-semiconductor Q2 connects the other end of LED lamp H.
2. a kind of LED lamp drive circuit with dimming function according to claim 1, is characterized in that, the model of described amplifier IC2 and IC3 is LM311.
3. a kind of LED lamp drive circuit with dimming function according to claim 1, is characterized in that, described isolated drive circuit is the isolation drive module centered by 4N25 optical coupler.
CN201520083401.8U 2015-02-06 2015-02-06 A kind of LED lamp drive circuit with dimming function Expired - Fee Related CN204465954U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201520083401.8U CN204465954U (en) 2015-02-06 2015-02-06 A kind of LED lamp drive circuit with dimming function

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Application Number Priority Date Filing Date Title
CN201520083401.8U CN204465954U (en) 2015-02-06 2015-02-06 A kind of LED lamp drive circuit with dimming function

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105491758A (en) * 2015-12-11 2016-04-13 中山市尊宝实业有限公司 New energy-efficiency standard energy-saving circuit with high power factor and ultra-low stand-by power consumption
CN105889859A (en) * 2015-10-02 2016-08-24 蒋超 LED rod type lighting device capable of being charged by solar energy and wind energy day and night
WO2019091468A1 (en) * 2017-11-10 2019-05-16 深圳市银河风云网络系统股份有限公司 Led light control device, system and control method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105889859A (en) * 2015-10-02 2016-08-24 蒋超 LED rod type lighting device capable of being charged by solar energy and wind energy day and night
CN105491758A (en) * 2015-12-11 2016-04-13 中山市尊宝实业有限公司 New energy-efficiency standard energy-saving circuit with high power factor and ultra-low stand-by power consumption
WO2019091468A1 (en) * 2017-11-10 2019-05-16 深圳市银河风云网络系统股份有限公司 Led light control device, system and control method

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GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20150708

Termination date: 20160206