CN104994654A - LED drive circuit - Google Patents
LED drive circuit Download PDFInfo
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- CN104994654A CN104994654A CN201510413040.3A CN201510413040A CN104994654A CN 104994654 A CN104994654 A CN 104994654A CN 201510413040 A CN201510413040 A CN 201510413040A CN 104994654 A CN104994654 A CN 104994654A
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- 239000004065 semiconductor Substances 0.000 claims description 21
- 238000004804 winding Methods 0.000 claims description 21
- 238000001914 filtration Methods 0.000 claims description 11
- 239000003990 capacitor Substances 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 4
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000010455 autoregulation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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Abstract
An LED drive circuit comprises an AC power source AC, a rectification and filter circuit, an LED control circuit and an LED circuit which are connected in sequence. The beneficial effects of the LED drive circuit are that when a power supply voltage fluctuates, current of the LED drive circuit can still fluctuate in a smaller range; and through the circuit, when a system fluctuates, an automatic regulating effect is achieved, and output voltage and current are allowed to be stable.
Description
Technical field
The present invention relates to lighting field, especially a kind of LED drive circuit.
Background technology
Along with the development of science and technology, LED is as new type light source, there is the advantages such as volume is little, power consumption is low, optical efficiency is high, the life-span is long, environmental protection, be widely used in lighting field, also there is LED drive circuit miscellaneous thereupon, in actual applications, the drive current of LED light source all has a direct impact luminous efficiency and life-span.
Be all at present adopt DC-DC wave chopping technology to carry out driving LED in the place of low-voltage, it has the advantages such as power consumption is little, efficiency is high, reliable and stable, but its cost is high, circuit is complicated, fragile, have stronger High-frequency Interference, bring inconvenience to user.In the application, LED drive circuit needs to keep constant-current characteristics as far as possible, namely when fluctuation occurs supply voltage, the electric current of LED drive circuit still can be kept to fluctuate in less scope.
Summary of the invention
Technical problem to be solved by this invention is, provides a kind of LED drive circuit rational in infrastructure, when fluctuation occurs supply voltage, the electric current of LED drive circuit still can be kept to fluctuate in less scope, make output voltage and current stabilization.
For solving the problems of the technologies described above, the invention provides a kind of LED drive circuit, comprising the AC power AC, current rectifying and wave filtering circuit, LED control circuit, the LED circuit that connect successively.
Preferably, current rectifying and wave filtering circuit is made up of rectifier bridge BD1 and filter capacitor.
Preferably, LED control circuit at least comprises a transformer T, a rectifier diode D2, a control chip U1.
Preferably, transformer T comprises armature winding, secondary winding and auxiliary winding.
Preferably, the concrete syndeton of LED drive circuit is: the positive pole of the 1 termination AC power AC of the first rectifier bridge BD1 in current rectifying and wave filtering circuit, ground connection after the 2 termination first electric capacity C1 of the first rectifier bridge BD1, the negative pole of the 3 termination AC power AC of the first rectifier bridge BD1, the direct ground connection of 4 end of the first rectifier bridge BD1;
2 ends of the power end IN termination first rectifier bridge BD1 of control chip U1, the earth terminal GND of control chip U1 holds direct ground connection, the grid of the control output end DRV termination first metal-oxide-semiconductor Q1 of control chip U1, feedback end FB termination the 5th resistance R5 of control chip U1 and the intermediate node of the 6th resistance R6;
2 ends of the one termination first rectifier bridge BD1 of the second electric capacity C2, the direct ground connection of the other end;
2 ends of the one termination first rectifier BD1 of the first resistance R1, the other end is connected with the negative electrode of the first diode D1, and the anode of the first diode D1 connects the drain electrode of the first metal-oxide-semiconductor Q1, and the 3rd electric capacity C3 is connected in parallel on the first resistance R1 two ends;
2 ends of the armature winding one termination first rectifier bridge BD1 of transformer T, the drain electrode of another termination first metal-oxide-semiconductor Q1; Secondary winding one end of transformer T connects series LED serial connection ground after the second diode D2, ground connection after another termination the 7th electric capacity C7; The two ends of the second diode D2 are connected in parallel on after second resistance R2 series connection the 4th electric capacity C4; The negative electrode of the 5th electric capacity C5 mono-termination second diode D2, ground connection after another termination the 7th electric capacity C7; 6th electric capacity C6 is connected in parallel on the two ends of the 5th electric capacity C5, and the 3rd resistance R3 is connected in parallel on the two ends of the 6th electric capacity C6; Auxiliary winding one end of transformer T connects ground connection after the 3rd diode D3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 successively, the source electrode of another termination first metal-oxide-semiconductor Q1; 8th electric capacity C8 is connected in parallel on the 5th resistance R5 and the 6th resistance R6 two ends that are in series.
Preferably, the concrete syndeton of LED drive circuit is: the positive pole of the 1 termination AC power AC of the first rectifier bridge BD1 in current rectifying and wave filtering circuit, ground connection after the 2 termination first electric capacity C1 of the first rectifier bridge BD1, the negative pole of the 3 termination AC power AC of the first rectifier bridge BD1, the direct ground connection of 4 end of the first rectifier bridge BD1;
2 ends of the one termination first rectifier bridge BD1 of the second electric capacity C2, the direct ground connection of the other end;
2 ends of the power end IN termination first rectifier bridge BD1 of control chip U1, the earth terminal GND of control chip U1 holds direct ground connection, the grid of control output end DRV termination first metal-oxide-semiconductor of control chip U1, the feedback end FB of control chip U1 holds and connects ground connection after the 4th resistance R4 and the 5th resistance R5 successively;
2 ends of the one termination first rectifier BD1 of the first resistance R1, the other end is connected with the negative electrode of the first diode D1, and the anode of the first diode D1 connects the drain electrode of the first metal-oxide-semiconductor Q1, and the 3rd electric capacity C3 is connected in parallel on the first resistance R1 two ends;
2 ends of the armature winding one termination first rectifier bridge BD1 of transformer T, the drain electrode of another termination first metal-oxide-semiconductor Q1;
Secondary winding one end of transformer T connects series LED serial connection ground after the second diode D2, ground connection after another termination the 7th electric capacity C7; The two ends of the second diode D2 are connected in parallel on after second resistance R2 series connection the 4th electric capacity C4; The negative electrode of the 5th electric capacity C5 mono-termination second diode D2, ground connection after another termination the 7th electric capacity C7; 6th electric capacity C6 is connected in parallel on the two ends of the 5th electric capacity C5;
Optocoupler OC comprises a phototriode and a light-emitting diode, receives 2 ends of the first rectifier bridge BD1 after collector electrode connection the 3rd resistance R3 of phototriode, ground connection after emitter connection the 5th resistance R5 of phototriode;
One end of resistance R7 is connected to the anode of LED strip, and the other end connects the tenth electric capacity C10 ground connection after connecting luminous diode and source of stable pressure successively; 8th resistance R8 one end is connected to the anode of LED strip, and the other end connects the tenth electric capacity C 10 ground connection after connecting the tenth resistance R10; One end of 6th resistance R6 is connected to the intermediate node of the 7th resistance R7 and light-emitting diode, and the other end connects ground connection after source of stable pressure and the tenth electric capacity C10 successively; 8th electric capacity C8 and the 6th resistance R6, the 7th resistance R7, the 8th resistance R8 form a loop, and the 9th resistance R9 and the 9th electric capacity C9 is connected in parallel on the two ends of the 8th electric capacity C8 after connecting.
Beneficial effect of the present invention is: when fluctuation occurs supply voltage, the electric current of LED drive circuit still can be kept to fluctuate in less scope, play autoregulation when system generation disturbance, make output voltage and current stabilization by circuit.
Accompanying drawing explanation
Fig. 1 is integrated circuit block diagram of the present invention.
Fig. 2 is a kind of circuit structure of LED drive circuit of the present invention.
Fig. 3 is the another kind of circuit structure of LED drive circuit of the present invention.
Embodiment
As shown in Figure 1, a kind of LED drive circuit, comprises the AC power AC, current rectifying and wave filtering circuit, LED control circuit and the LED circuit that connect successively.
As shown in Figure 2, the positive pole of the 1 termination AC power AC of the first rectifier bridge BD1 in current rectifying and wave filtering circuit, ground connection after the 2 termination first electric capacity C1 of the first rectifier bridge BD1, the negative pole of the 3 termination AC power AC of the first rectifier bridge BD1, the direct ground connection of 4 end of the first rectifier bridge BD1;
2 ends of the power end IN termination first rectifier bridge BD1 of control chip U1, the earth terminal GND of control chip U1 holds direct ground connection, the grid of the control output end DRV termination first metal-oxide-semiconductor Q1 of control chip U1, feedback end FB termination the 5th resistance R5 of control chip U1 and the intermediate node of the 6th resistance R6;
2 ends of the one termination first rectifier bridge BD1 of the second electric capacity C2, the direct ground connection of the other end;
2 ends of the one termination first rectifier BD1 of the first resistance R1, the other end is connected with the negative electrode of the first diode D1, and the anode of the first diode D1 connects the drain electrode of the first metal-oxide-semiconductor Q1, and the 3rd electric capacity C3 is connected in parallel on the first resistance R1 two ends;
2 ends of the armature winding one termination first rectifier bridge BD1 of transformer T, the drain electrode of another termination first metal-oxide-semiconductor Q1; Secondary winding one end of transformer T connects series LED serial connection ground after the second diode D2, ground connection after another termination the 7th electric capacity C7; The two ends of the second diode D2 are connected in parallel on after second resistance R2 series connection the 4th electric capacity C4; The negative electrode of the 5th electric capacity C5 mono-termination second diode D2, ground connection after another termination the 7th electric capacity C7; 6th electric capacity C6 is connected in parallel on the two ends of the 5th electric capacity C5, and the 3rd resistance R3 is connected in parallel on the two ends of the 6th electric capacity C6; Auxiliary winding one end of transformer T connects ground connection after the 3rd diode D3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 successively, the source electrode of another termination first metal-oxide-semiconductor Q1; 8th electric capacity C8 is connected in parallel on the 5th resistance R5 and the 6th resistance R6 two ends that are in series.
As shown in Figure 3, the positive pole of the 1 termination AC power AC of the first rectifier bridge BD1 in current rectifying and wave filtering circuit, ground connection after the 2 termination first electric capacity C1 of the first rectifier bridge BD1, the negative pole of the 3 termination AC power AC of the first rectifier bridge BD1, the direct ground connection of 4 end of the first rectifier bridge BD1;
2 ends of the one termination first rectifier bridge BD1 of the second electric capacity C2, the direct ground connection of the other end;
2 ends of the power end IN termination first rectifier bridge BD1 of control chip U1, the earth terminal GND of control chip U1 holds direct ground connection, the grid of control output end DRV termination first metal-oxide-semiconductor of control chip U1, the feedback end FB of control chip U1 holds and connects ground connection after the 4th resistance R4 and the 5th resistance R5 successively;
2 ends of the one termination first rectifier BD1 of the first resistance R1, the other end is connected with the negative electrode of the first diode D1, and the anode of the first diode D1 connects the drain electrode of the first metal-oxide-semiconductor Q1, and the 3rd electric capacity C3 is connected in parallel on the first resistance R1 two ends;
2 ends of the armature winding one termination first rectifier bridge BD1 of transformer T, the drain electrode of another termination first metal-oxide-semiconductor Q1;
Secondary winding one end of transformer T connects series LED serial connection ground after the second diode D2, ground connection after another termination the 7th electric capacity C7; The two ends of the second diode D2 are connected in parallel on after second resistance R2 series connection the 4th electric capacity C4; The negative electrode of the 5th electric capacity C5 mono-termination second diode D2, ground connection after another termination the 7th electric capacity C7; 6th electric capacity C6 is connected in parallel on the two ends of the 5th electric capacity C5;
Optocoupler OC comprises a phototriode and a light-emitting diode, receives 2 ends of the first rectifier bridge BD1 after collector electrode connection the 3rd resistance R3 of phototriode, ground connection after emitter connection the 5th resistance R5 of phototriode;
One end of resistance R7 is connected to the anode of LED strip, and the other end connects the tenth electric capacity C10 ground connection after connecting luminous diode and source of stable pressure successively; 8th resistance R8 one end is connected to the anode of LED strip, and the other end connects the tenth electric capacity C 10 ground connection after connecting the tenth resistance R10; One end of 6th resistance R6 is connected to the intermediate node of the 7th resistance R7 and light-emitting diode, and the other end connects ground connection after source of stable pressure and the tenth electric capacity C10 successively; 8th electric capacity C8 and the 6th resistance R6, the 7th resistance R7, the 8th resistance R8 form a loop, and the 9th resistance R9 and the 9th electric capacity C9 is connected in parallel on the two ends of the 8th electric capacity C8 after connecting.
Although the present invention illustrates with regard to preferred implementation and describes, only it will be understood by those of skill in the art that otherwise exceed claim limited range of the present invention, variations and modifications can be carried out to the present invention.
Claims (6)
1. a LED drive circuit, is characterized in that, comprises the AC power AC, current rectifying and wave filtering circuit, LED control circuit, the LED circuit that connect successively.
2. LED drive circuit as claimed in claim 1, it is characterized in that, described current rectifying and wave filtering circuit is made up of rectifier bridge BD1 and filter capacitor.
3. LED drive circuit as claimed in claim 1, it is characterized in that, described LED control circuit at least comprises a transformer T, a rectifier diode D2, a control chip U1.
4. LED drive circuit as claimed in claim 3, it is characterized in that, described transformer T comprises armature winding, secondary winding and auxiliary winding.
5. LED drive circuit as claimed in claim 1, it is characterized in that, the concrete syndeton of LED drive circuit is: the positive pole of the 1 termination AC power AC of the first rectifier bridge BD1 in current rectifying and wave filtering circuit, ground connection after the 2 termination first electric capacity C1 of the first rectifier bridge BD1, the negative pole of the 3 termination AC power AC of the first rectifier bridge BD1, the direct ground connection of 4 end of the first rectifier bridge BD1;
2 ends of the power end IN termination first rectifier bridge BD1 of control chip U1, the earth terminal GND of control chip U1 holds direct ground connection, the grid of the control output end DRV termination first metal-oxide-semiconductor Q1 of control chip U1, feedback end FB termination the 5th resistance R5 of control chip U1 and the intermediate node of the 6th resistance R6;
2 ends of the one termination first rectifier bridge BD1 of the second electric capacity C2, the direct ground connection of the other end;
2 ends of the one termination first rectifier BD1 of the first resistance R1, the other end is connected with the negative electrode of the first diode D1, and the anode of the first diode D1 connects the drain electrode of the first metal-oxide-semiconductor Q1, and the 3rd electric capacity C3 is connected in parallel on the first resistance R1 two ends;
2 ends of the armature winding one termination first rectifier bridge BD1 of transformer T, the drain electrode of another termination first metal-oxide-semiconductor Q1; Secondary winding one end of transformer T connects series LED serial connection ground after the second diode D2, ground connection after another termination the 7th electric capacity C7; The two ends of the second diode D2 are connected in parallel on after second resistance R2 series connection the 4th electric capacity C4; The negative electrode of the 5th electric capacity C5 mono-termination second diode D2, ground connection after another termination the 7th electric capacity C7; 6th electric capacity C6 is connected in parallel on the two ends of the 5th electric capacity C5, and the 3rd resistance R3 is connected in parallel on the two ends of the 6th electric capacity C6; Auxiliary winding one end of transformer T connects ground connection after the 3rd diode D3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 successively, the source electrode of another termination first metal-oxide-semiconductor Q1; 8th electric capacity C8 is connected in parallel on the 5th resistance R5 and the 6th resistance R6 two ends that are in series.
6. LED drive circuit as claimed in claim 1, it is characterized in that, the concrete syndeton of LED drive circuit is: the positive pole of the 1 termination AC power AC of the first rectifier bridge BD1 in current rectifying and wave filtering circuit, ground connection after the 2 termination first electric capacity C1 of the first rectifier bridge BD1, the negative pole of the 3 termination AC power AC of the first rectifier bridge BD1, the direct ground connection of 4 end of the first rectifier bridge BD1;
2 ends of the one termination first rectifier bridge BD1 of the second electric capacity C2, the direct ground connection of the other end;
2 ends of the power end IN termination first rectifier bridge BD1 of control chip U1, the earth terminal GND of control chip U1 holds direct ground connection, the grid of control output end DRV termination first metal-oxide-semiconductor of control chip U1, the feedback end FB of control chip U1 holds and connects ground connection after the 4th resistance R4 and the 5th resistance R5 successively;
2 ends of the one termination first rectifier BD1 of the first resistance R1, the other end is connected with the negative electrode of the first diode D1, and the anode of the first diode D1 connects the drain electrode of the first metal-oxide-semiconductor Q1, and the 3rd electric capacity C3 is connected in parallel on the first resistance R1 two ends;
2 ends of the armature winding one termination first rectifier bridge BD1 of transformer T, the drain electrode of another termination first metal-oxide-semiconductor Q1;
Secondary winding one end of transformer T connects series LED serial connection ground after the second diode D2, ground connection after another termination the 7th electric capacity C7; The two ends of the second diode D2 are connected in parallel on after second resistance R2 series connection the 4th electric capacity C4; The negative electrode of the 5th electric capacity C5 mono-termination second diode D2, ground connection after another termination the 7th electric capacity C7; 6th electric capacity C6 is connected in parallel on the two ends of the 5th electric capacity C5;
Optocoupler OC comprises a phototriode and a light-emitting diode, receives 2 ends of the first rectifier bridge BD1 after collector electrode connection the 3rd resistance R3 of phototriode, ground connection after emitter connection the 5th resistance R5 of phototriode;
One end of resistance R7 is connected to the anode of LED strip, and the other end connects the tenth electric capacity C10 ground connection after connecting luminous diode and source of stable pressure successively; 8th resistance R8 one end is connected to the anode of LED strip, and the other end connects the tenth electric capacity C 10 ground connection after connecting the tenth resistance R10; One end of 6th resistance R6 is connected to the intermediate node of the 7th resistance R7 and light-emitting diode, and the other end connects ground connection after source of stable pressure and the tenth electric capacity C10 successively; 8th electric capacity C8 and the 6th resistance R6, the 7th resistance R7, the 8th resistance R8 form a loop, and the 9th resistance R9 and the 9th electric capacity C9 is connected in parallel on the two ends of the 8th electric capacity C8 after connecting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510413040.3A CN104994654B (en) | 2015-07-14 | 2015-07-14 | A kind of LED drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510413040.3A CN104994654B (en) | 2015-07-14 | 2015-07-14 | A kind of LED drive circuit |
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| CN104994654A true CN104994654A (en) | 2015-10-21 |
| CN104994654B CN104994654B (en) | 2018-03-13 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201063902Y (en) * | 2007-03-08 | 2008-05-21 | 宁波安迪光电科技有限公司 | LED driving power supply |
| CN202634790U (en) * | 2012-05-03 | 2012-12-26 | 常州润泽光能科技有限公司 | LED-lamp isolation driving power supply |
| CN103025033A (en) * | 2013-01-11 | 2013-04-03 | 淮南市矿用电器设备有限责任公司 | Universal mining LED lamp driver |
| CN204291498U (en) * | 2014-12-12 | 2015-04-22 | 上海能照光电科技有限公司 | A kind of isolated form LED drive circuit based on transformer |
-
2015
- 2015-07-14 CN CN201510413040.3A patent/CN104994654B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201063902Y (en) * | 2007-03-08 | 2008-05-21 | 宁波安迪光电科技有限公司 | LED driving power supply |
| CN202634790U (en) * | 2012-05-03 | 2012-12-26 | 常州润泽光能科技有限公司 | LED-lamp isolation driving power supply |
| CN103025033A (en) * | 2013-01-11 | 2013-04-03 | 淮南市矿用电器设备有限责任公司 | Universal mining LED lamp driver |
| CN204291498U (en) * | 2014-12-12 | 2015-04-22 | 上海能照光电科技有限公司 | A kind of isolated form LED drive circuit based on transformer |
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| CN104994654B (en) | 2018-03-13 |
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Effective date of registration: 20190116 Address after: 213000 Zhuangcun, Hengshanqiao Town, Wujin District, Changzhou City, Jiangsu Province Patentee after: CHANGZHOU GARDEN LIGHTING TECHNOLOGY CO.,LTD. Address before: 224051 middle road of hope Avenue, Yancheng City, Jiangsu Province, No. 1 Patentee before: YANCHENG INSTITUTE OF TECHNOLOGY |
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Denomination of invention: LED driving circuit Effective date of registration: 20210927 Granted publication date: 20180313 Pledgee: China Construction Bank Corporation Changzhou Economic Development Zone sub branch Pledgor: CHANGZHOU GARDEN LIGHTING TECHNOLOGY Co.,Ltd. Registration number: Y2021980009957 |
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Date of cancellation: 20221226 Granted publication date: 20180313 Pledgee: China Construction Bank Corporation Changzhou Economic Development Zone sub branch Pledgor: CHANGZHOU GARDEN LIGHTING TECHNOLOGY CO.,LTD. Registration number: Y2021980009957 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A kind of LED driving circuit Effective date of registration: 20221227 Granted publication date: 20180313 Pledgee: China Construction Bank Corporation Changzhou Economic Development Zone sub branch Pledgor: CHANGZHOU GARDEN LIGHTING TECHNOLOGY CO.,LTD. Registration number: Y2022980029137 |