CN104684177A - Optical coupler feedback full-voltage LED (light emitting diode) driving circuit and LED illuminating equipment - Google Patents
Optical coupler feedback full-voltage LED (light emitting diode) driving circuit and LED illuminating equipment Download PDFInfo
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- CN104684177A CN104684177A CN201310636464.7A CN201310636464A CN104684177A CN 104684177 A CN104684177 A CN 104684177A CN 201310636464 A CN201310636464 A CN 201310636464A CN 104684177 A CN104684177 A CN 104684177A
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Abstract
The embodiments of the invention disclose an optical coupler feedback full-voltage LED (light emitting diode) driving circuit and LED illuminating equipment. The circuit comprises a chip U1, an input protection circuit, a feedback circuit, a tank circuit, a filter circuit, an overvoltage protection circuit and a voltage stabilizing circuit, wherein the cathode of the input protection circuit is connected with the chip U1 for adjusting input voltage; the feedback circuit is connected with the chip U1 for providing feedback to the chip U1 and outputting stable voltage; the tank circuit is connected with the chip U1 for storing electric energy; the filter circuit is connected with the tank circuit for filtering; the overvoltage protection circuit is connected with the anode of the input protection circuit for maintaining to output stable voltage when the feedback circuit is failed; the voltage stabilizing circuit is connected with the tank circuit and used for stabilizing voltage. The circuit disclosed by the embodiments of the invention can provide stable direct-current voltage to LED without a transformer, the voltage range is applicable for world wide voltage (after 85VAC-265VAC rectification); the circuit is simple in structure, low in failure rate and low in cost.
Description
Technical field
The present invention relates to field of illumination systems, particularly relate to a kind of opto-coupled feedback full voltage LED drive circuit and LED illumination device.
Background technology
Due to the semiconductor device that LED is characteristic sensitivity, again there is negative temperature characteristic, thus in use need to protect it.LED component is to the requirement of driving power near harshness, and LED is different from common incandescent lamp bulb, and ordinary incandescent lamp bubble directly can connect the electric main of 220V, and LED only needs the low voltage drive of 2 ~ 3 volts, must use LED drive circuit.
The LED of different purposes, be equipped with different drive circuits and power supply adaptor, and LED drive circuit structure of the prior art is complicated, and failure rate is high, and efficiency is lower, for user causes very big inconvenience.
Summary of the invention
Embodiment of the present invention technical problem to be solved is, provides a kind of opto-coupled feedback full voltage LED drive circuit and LED illumination device, and this circuit can without the need to transformer, and voltage range is applicable to global Width funtion (after 85VAC to 265VAC rectification).
The opto-coupled feedback full voltage LED drive circuit that the embodiment of the present invention provides comprises: chip U1, input protection circuit, feedback circuit, accumulator, filter circuit, overvoltage crowbar, voltage stabilizing circuit, wherein,
The negative pole of described input protection circuit is connected with described chip U1; for regulating input voltage; described feedback circuit is connected with described chip U1; for providing feedback for described chip U1; the voltage of stable output; described accumulator is connected with described chip U1; for store electrical energy; described filter circuit is connected with described accumulator, and for filtering, described overvoltage crowbar is connected with the positive pole of described input protection circuit; when losing efficacy for described feedback circuit; maintain the voltage of stable output, described voltage stabilizing circuit is connected with described accumulator, for voltage stabilizing.
As the optional execution mode of one; described input protection circuit comprises: socket CON1, fuse F1, thermistor M1, the first electric capacity C1, the second electric capacity C2, transformer T1, the 3rd electric capacity C3, the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4; wherein
One end of described socket CON1 is connected with one end of described fuse F1, and the other end is connected with one end of described thermistor M1;
The other end of described fuse F1 is connected with one end of described first electric capacity C1, the another of described thermistor M1 simultaneously;
One end of described first electric capacity C1 is also connected with one end of described transformer T1, and the other end of described first electric capacity C1 is connected with one end of described second electric capacity C2;
The other end of described second electric capacity C2 is connected with one end of described transformer T1 and described thermistor M1 simultaneously;
One end of described 3rd resistance C3 is connected with one end of the other end of described transformer and described first diode D1, the second diode D2 respectively, and the other end of described 3rd resistance C3 is connected with one end of described 4th diode D4, the 3rd diode D3 respectively;
In parallel after connecting with the 3rd diode D3 with the second diode D2 after first diode D1 connects with the 4th diode D4.
As the optional execution mode of one, described feedback circuit comprises: the first triode Q1 and the 4th electric capacity C4, wherein,
The emitter of described first triode Q1 is connected with the FB pin of described chip U1, and collector electrode is connected with the BP pin of described chip U1, one end of the 4th electric capacity C4 simultaneously;
The other end of described 4th electric capacity C4 is connected with the S pin of described chip U1.
As the optional execution mode of one, described first triode Q1 comprises: optocoupler triode.
As the optional execution mode of one, described filter circuit is connected with described accumulator, and described accumulator comprises: the 5th diode D5 and the first inductance L 1, wherein,
The anode of described 5th diode D5 is connected with the D pin of described chip U1, one end of the first inductance L 1 respectively, the negative electrode of described 5th diode D5 and described input protection circuit positive pole be connected.
As the optional execution mode of one, described filter circuit comprises: the 5th electric capacity C5, wherein,
One end of described 5th electric capacity C5 is connected with the other end of described first inductance L 1, and the other end of described 5th electric capacity C5 is connected with the negative electrode of described 5th diode D5.
As the optional execution mode of one, described overvoltage crowbar comprises: the first resistance R1, the 6th diode D6 and the 7th diode D7, wherein,
One end of described first resistance R1 is connected with the negative electrode of described 6th diode D6, the other end of described first resistance R1 and described input protection circuit positive pole be connected;
The anode of described 6th diode D6 is connected with the anode of described 7th diode D7.
As the optional execution mode of one, described voltage stabilizing circuit comprises: the 8th diode D8, the second resistance R2 and voltage-stabiliser tube Z1, wherein,
The anode of described 8th diode D8 is connected with one end of described second resistance R2, and the negative electrode of described 8th diode D8 is connected with the other end of described second resistance R2;
The negative electrode of described voltage-stabiliser tube Z1 is connected with the negative electrode of described 8th diode D8, the other end of the second resistance R2 simultaneously, and the anode of described voltage-stabiliser tube Z1 is connected with load.
As the optional execution mode of one, described 8th diode D8 comprises: light-emitting diode.
Correspondingly, the embodiment of the present invention also provides a kind of LED illumination device, and described LED illumination device comprises above-mentioned opto-coupled feedback full voltage LED drive circuit.
The opto-coupled feedback full voltage LED drive circuit that the embodiment of the present invention provides and LED illumination device, this circuit can without the need to transformer, for LED provides galvanic current pressure, voltage range is applicable to global Width funtion (after 85VAC to 265VAC rectification), structure is simple, and failure rate is low is with low cost.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is embodiment of the present invention opto-coupled feedback full voltage LED drive circuit structure schematic diagram;
Fig. 2 is another embodiment of the present invention opto-coupled feedback full voltage LED drive circuit structure schematic diagram.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Refer to Fig. 1; it is embodiment of the present invention opto-coupled feedback full voltage LED drive circuit structure schematic diagram; namely opto-coupled feedback full voltage LED drive circuit of the present invention can be without the need to transformer the voltage that LED provides stable; it comprises: chip U1, input protection circuit 10, feedback circuit 20, accumulator 30, filter circuit 40, overvoltage crowbar 50, voltage stabilizing circuit 60; wherein
The negative pole of described input protection circuit is connected with described chip U1; for regulating input voltage; described feedback circuit is connected with described chip U1; for providing feedback for described chip U1; the voltage of stable output; described accumulator is connected with described chip U1; for store electrical energy; described filter circuit is connected with described accumulator, and for filtering, described overvoltage crowbar is connected with the positive pole of described input protection circuit; when losing efficacy for described feedback circuit; maintain the voltage of stable output, described voltage stabilizing circuit is connected with described accumulator, for voltage stabilizing.
Should be appreciated that the preferred LNK30X of chip U1, certainly, in other execution mode of the embodiment of the present invention, also can identical other electronic devices and components of selection function.
The opto-coupled feedback full voltage LED drive circuit that the embodiment of the present invention provides and LED illumination device, this circuit can without the need to transformer, for LED provides galvanic current pressure, voltage range is applicable to global Width funtion (after 85VAC to 265VAC rectification), structure is simple, and failure rate is low is with low cost.
Refer to Fig. 2, it is another embodiment of the present invention opto-coupled feedback full voltage LED drive circuit structure schematic diagram, namely opto-coupled feedback full voltage LED drive circuit of the present invention can be without the need to transformer the voltage that LED provides stable, comprise: chip U1, input protection circuit 10, feedback circuit 20, accumulator 30, filter circuit 40, overvoltage crowbar 50, voltage stabilizing circuit 60, certainly, also comprise load 70, embodiment of the present invention load 70 comprises 3 LED, in other embodiments of the present invention, user can adjust the quantity of LED according to actual needs, the present invention does not limit.
Input protection circuit 10 is connected with described chip U1; for regulating input voltage; it comprises: socket CON1, fuse F1, thermistor M1, the first electric capacity C1, the second electric capacity C2, transformer T1, the 3rd electric capacity C3, the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4; wherein
One end of described socket CON1 is connected with one end of described fuse F1, and the other end is connected with one end of described thermistor M1;
The other end of described fuse F1 is connected with one end of described first electric capacity C1, the another of described thermistor M1 simultaneously;
One end of described first electric capacity C1 is also connected with one end of described transformer T1, and the other end of described first electric capacity C1 is connected with one end of described second electric capacity C2;
The other end of described second electric capacity C2 is connected with one end of described transformer T1 and described thermistor M1 simultaneously;
One end of described 3rd resistance C3 is connected with one end of the other end of described transformer and described first diode D1, the second diode D2 respectively, and the other end of described 3rd resistance C3 is connected with one end of described 4th diode D4, the 3rd diode D3 respectively;
In parallel after connecting with the 3rd diode D3 with the second diode D2 after first diode D1 connects with the 4th diode D4.
Feedback circuit 20 is connected with described chip U1, for providing feedback for described chip U1, comprising: the first triode Q1 and the 4th electric capacity C4, wherein,
The emitter of described first triode Q1 is connected with the FB pin of described chip U1, and collector electrode is connected with the BP pin of described chip U1, one end of the 4th electric capacity C4 simultaneously;
The other end of described 4th electric capacity C4 is connected with the S pin of described chip U1.The size of the 4th electric capacity C4 can select 0.1 μ F, thus realizes high frequency decoupling and stored energy.
It is understood that when the electric current of the FB pin flowing into chip U1 is greater than 49 μ A (now voltage 1.65V), chip U1 inside can export a low logic level signal (inhibit signal).First triode Q1 can keep off state (forbidding).When the electric current flowing into FB pin is less than 49 μ A.Chip U1 internal feedback circuitry can export a high logic level signal (inhibit signal).First triode Q1 can keep opening state (enable).
Filter circuit 40 is connected with described accumulator 30, and described accumulator 30 comprises: the 5th diode D5 and the first inductance L 1, wherein,
The anode of the 5th diode D5 is connected with the D pin of chip U1, one end of the first inductance L 1 respectively, the negative electrode of the 5th diode D5 and input protection circuit positive pole be connected.
Filter circuit 40, for filtering, comprising: the 5th electric capacity C5, wherein,
One end of described 5th electric capacity C5 is connected with the other end of described first inductance L 1, and the other end of described 5th electric capacity C5 is connected with the negative electrode of described 5th diode D5.
Overvoltage crowbar 50 is connected with accumulator 30, for when feedback circuit 20 lost efficacy, maintains the voltage of stable output, specifically comprises: the first resistance R1, the 6th diode D6 and the 7th diode D7, wherein,
One end of described first resistance R1 is connected with the negative electrode of described 6th diode D6, the other end of described first resistance R1 and described input protection circuit positive pole be connected;
The anode of described 6th diode D6 is connected with the anode of described 7th diode D7.
Voltage stabilizing circuit 60, for voltage stabilizing, comprising: the 8th diode D8, the second resistance R2 and voltage-stabiliser tube Z1, wherein,
The anode of described 8th diode D8 is connected with one end of described second resistance R2, and the negative electrode of described 8th diode D8 is connected with the other end of described second resistance R2;
The negative electrode of described voltage-stabiliser tube Z1 is connected with the negative electrode of described 8th diode D8, the other end of the second resistance R2 simultaneously, and the anode of described voltage-stabiliser tube Z1 is connected with load.
It is understood that, first triode Q1 is optocoupler triode, the light that output voltage Vo is sent by the 8th diode D8 is received by the first triode Q1, first triode Q1 produces photoelectric current according to the intensity of the light received, and the size of this photoelectric current obtains according to the current delivery rate (CTR) of selected optocoupler and the electric current I f of the 8th diode D8.8th diode D8 is light-emitting diode, and the specifications that its electric current I f looks into optocoupler or light-emitting diode by (Vo-Vz) can obtain, and therefore, regulates the value of voltage-stabiliser tube Z1, just can obtain required Vo value.
The operation principle of embodiment of the present invention circuit is: Vin input can input the alternating voltage of 85V to 265V, and Vo end exports low-voltage dc voltage.Alternating current inputs from the D pin of chip U1, S pin exports, the FB pin of chip U1 is used for input feedback signal, when the electric current flowing into FB pin is greater than 49 μ A (now voltage 1.65V), the switch of the first triode Q1 is terminated, and the BP pin of chip U1 is used for providing 5.8V operating voltage to chip U1.BP pin due to chip U1 is the energization pins of master control; there is under-voltage protection function: the switch of closing power MOSFET when this pin voltage drops to 4.85 below V; once under bypass pin voltage drop to 4.85 V, it must rise back 5.8 V more just can the switch of enable (unlatching) power MOSFET again.
At the first triode Q1 blocking interval, the 4th electric capacity C4 is charged to 5.8 V.When the first triode Q1 conducting, chip U1 utilizes the energy be stored in the 4th electric capacity C4 to power, and the power consumption of the 4th electric capacity C4 inside is extremely low, only relies on the electric current absorbed from drain lead just can normally work.
In addition, embodiment of the present invention circuit also has overheat protective function, and thermistor M1 detects the temperature of silicon chip, and threshold value can be arranged on 142 DEG C, and possesses the sluggish scope of 75 DEG C.When junction temperature exceedes this threshold value (142 DEG C), the switch of the first triode Q1 is prohibited, until junction temperature drops to less than 75 DEG C, the first triode Q1 just can reopen, and prevents that circuit is overheated to cause damage.
Should be appreciated that embodiment of the present invention electronic devices and components are directly provided by the voltage of drain lead in the power consumption of startup and duration of work, therefore can save the interlock circuit of biased power supply in BUCK and flyback converter.In addition, run into the failure condition of short circuit, open loop at circuit under, power output can be limited safely, and reduce the number of components and parts, directly can be reduced in the system-level cost for load protection circuit.
The opto-coupled feedback full voltage LED drive circuit that the embodiment of the present invention provides and LED illumination device, this circuit can without the need to transformer, for LED provides galvanic current pressure, voltage range is applicable to global Width funtion (after 85VAC to 265VAC rectification), structure is simple, and failure rate is low is with low cost.
The embodiment of the present invention also provides a kind of LED illumination device, and described LED illumination device comprises above-mentioned opto-coupled feedback full voltage LED drive circuit.
Above disclosedly be only present pre-ferred embodiments, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the claims in the present invention are done, still belong to the scope that the present invention is contained.
Claims (10)
1. an opto-coupled feedback full voltage LED drive circuit, is characterized in that, comprising: chip U1, input protection circuit, feedback circuit, accumulator, filter circuit, overvoltage crowbar, voltage stabilizing circuit, wherein,
The negative pole of described input protection circuit is connected with described chip U1; for regulating input voltage; described feedback circuit is connected with described chip U1; for providing feedback for described chip U1; the voltage of stable output; described accumulator is connected with described chip U1; for store electrical energy; described filter circuit is connected with described accumulator, and for filtering, described overvoltage crowbar is connected with the positive pole of described input protection circuit; when losing efficacy for described feedback circuit; maintain the voltage of stable output, described voltage stabilizing circuit is connected with described accumulator, for voltage stabilizing.
2. circuit as claimed in claim 1; it is characterized in that; described input protection circuit comprises: socket CON1, fuse F1, thermistor M1, the first electric capacity C1, the second electric capacity C2, transformer T1, the 3rd electric capacity C3, the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4; wherein
One end of described socket CON1 is connected with one end of described fuse F1, and the other end is connected with one end of described thermistor M1;
The other end of described fuse F1 is connected with one end of described first electric capacity C1, the another of described thermistor M1 simultaneously;
One end of described first electric capacity C1 is also connected with one end of described transformer T1, and the other end of described first electric capacity C1 is connected with one end of described second electric capacity C2;
The other end of described second electric capacity C2 is connected with one end of described transformer T1 and described thermistor M1 simultaneously;
One end of described 3rd resistance C3 is connected with one end of the other end of described transformer and described first diode D1, the second diode D2 respectively, and the other end of described 3rd resistance C3 is connected with one end of described 4th diode D4, the 3rd diode D3 respectively;
In parallel after connecting with the 3rd diode D3 with the second diode D2 after first diode D1 connects with the 4th diode D4.
3. circuit as claimed in claim 1, it is characterized in that, described feedback circuit comprises: the first triode Q1 and the 4th electric capacity C4, wherein,
The emitter of described first triode Q1 is connected with the FB pin of described chip U1, and collector electrode is connected with the BP pin of described chip U1, one end of the 4th electric capacity C4 simultaneously;
The other end of described 4th electric capacity C4 is connected with the S pin of described chip U1.
4. circuit as claimed in claim 3, it is characterized in that, described first triode Q1 comprises: optocoupler triode.
5. circuit as claimed in claim 1, it is characterized in that, described filter circuit is connected with described accumulator, and described accumulator comprises: the 5th diode D5 and the first inductance L 1, wherein,
The anode of described 5th diode D5 is connected with the D pin of described chip U1, one end of the first inductance L 1 respectively, the negative electrode of described 5th diode D5 and described input protection circuit positive pole be connected.
6. circuit as claimed in claim 5, it is characterized in that, described filter circuit comprises: the 5th electric capacity C5, wherein,
One end of described 5th electric capacity C5 is connected with the other end of described first inductance L 1, and the other end of described 5th electric capacity C5 is connected with the negative electrode of described 5th diode D5.
7. circuit as claimed in claim 1, it is characterized in that, described overvoltage crowbar comprises: the first resistance R1, the 6th diode D6 and the 7th diode D7, wherein,
One end of described first resistance R1 is connected with the negative electrode of described 6th diode D6, the other end of described first resistance R1 and described input protection circuit positive pole be connected;
The anode of described 6th diode D6 is connected with the anode of described 7th diode D7.
8. circuit as claimed in claim 1, it is characterized in that, described voltage stabilizing circuit comprises: the 8th diode D8, the second resistance R2 and voltage-stabiliser tube Z1, wherein,
The anode of described 8th diode D8 is connected with one end of described second resistance R2, and the negative electrode of described 8th diode D8 is connected with the other end of described second resistance R2;
The negative electrode of described voltage-stabiliser tube Z1 is connected with the negative electrode of described 8th diode D8, the other end of the second resistance R2 simultaneously, and the anode of described voltage-stabiliser tube Z1 is connected with load.
9. circuit as claimed in claim 8, it is characterized in that, described 8th diode D8 comprises: light-emitting diode.
10. a LED illumination device, is characterized in that, described LED illumination device comprises: the opto-coupled feedback full voltage LED drive circuit described in claim 1-9 any one.
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| CN201310636464.7A CN104684177B (en) | 2013-12-03 | 2013-12-03 | optical coupler feedback full-voltage LED drive circuit and LED lighting equipment |
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| CN201310636464.7A CN104684177B (en) | 2013-12-03 | 2013-12-03 | optical coupler feedback full-voltage LED drive circuit and LED lighting equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108539977A (en) * | 2018-05-14 | 2018-09-14 | 武汉华星光电半导体显示技术有限公司 | Protect circuit and display panel |
| US10778004B2 (en) | 2018-05-14 | 2020-09-15 | Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Protection circuit and display panel |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101925230A (en) * | 2010-07-29 | 2010-12-22 | 福建捷联电子有限公司 | LED (Light Emitting Diode) drive power source with high efficiency, low power consumption and low cost |
| CN102843816A (en) * | 2011-06-24 | 2012-12-26 | 上海边光实业有限公司 | High-power LED (light emitting diode) power circuit |
| CN103248108A (en) * | 2013-05-16 | 2013-08-14 | 常州矽能电子科技有限公司 | LED (Light Emitting Diode) driver with MOS (Metal Oxide Semiconductor) tube switching module and reusable DC (Direct Current)-DC (Direct Current) module |
-
2013
- 2013-12-03 CN CN201310636464.7A patent/CN104684177B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101925230A (en) * | 2010-07-29 | 2010-12-22 | 福建捷联电子有限公司 | LED (Light Emitting Diode) drive power source with high efficiency, low power consumption and low cost |
| CN102843816A (en) * | 2011-06-24 | 2012-12-26 | 上海边光实业有限公司 | High-power LED (light emitting diode) power circuit |
| CN103248108A (en) * | 2013-05-16 | 2013-08-14 | 常州矽能电子科技有限公司 | LED (Light Emitting Diode) driver with MOS (Metal Oxide Semiconductor) tube switching module and reusable DC (Direct Current)-DC (Direct Current) module |
Non-Patent Citations (1)
| Title |
|---|
| 佚名: "6W-30W非隔离LED日光灯设计和应用", 《HTTP://WWW.ELECFANS.COM/ARTICLE/83/116/2010/20100401213967.HTML》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108539977A (en) * | 2018-05-14 | 2018-09-14 | 武汉华星光电半导体显示技术有限公司 | Protect circuit and display panel |
| US10778004B2 (en) | 2018-05-14 | 2020-09-15 | Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Protection circuit and display panel |
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