CN204887585U - Turn over and swash formula LED drive circuit - Google Patents
Turn over and swash formula LED drive circuit Download PDFInfo
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- CN204887585U CN204887585U CN201520560427.7U CN201520560427U CN204887585U CN 204887585 U CN204887585 U CN 204887585U CN 201520560427 U CN201520560427 U CN 201520560427U CN 204887585 U CN204887585 U CN 204887585U
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- 238000002955 isolation Methods 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 abstract description 2
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
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- 239000003381 stabilizer Substances 0.000 description 1
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Abstract
The utility model discloses a turn over and swash formula LED drive circuit, including inductance L1, inductance L2, rectifier bridge Q, resistance R1, transformer T, triode Q2 and power switch pipe Q1, 220V alternating current one end is connected to inductance L1 one end, electric capacity C11 and inductance L2 are connected respectively to the inductance L1 other end, electric capacity C12 and rectifier bridge Q pin 1 are connected respectively to the inductance L2 other end, the electric capacity C12 other end is connected respectively to rectifier bridge Q pin 3, the electric capacity C11 other end and inductance L3, the 220V alternating current other end is connected to the inductance L3 other end, 2 difference connecting resistance R1 of rectifier bridge Q pin, resistance R3, electric capacity C9, resistance R11 and transformer T coil L4. The utility model discloses it is simple that turn over and swash formula LED drive circuit has a circuit structure, security isolation, and advantage with low costs is particularly suitable for miniwatt LED drive power supply's requirement, adopts the former limit on -off control mode of transformer moreover, has saved vice limit output constant current constant voltage detection circuitry and optic -coupling parts, and further the cost is reduced has improved system reliability and price / performance ratio.
Description
Technical field
The utility model relates to a kind of LED, specifically a kind of inverse-excitation type LED drive circuit.
Background technology
More existing inverse-excitation type LED drive circuits all adopt optocoupler to carry out isolation drive, and circuit structure is complicated, and cost is high, less stable.
Utility model content
The purpose of this utility model is to provide a kind of inverse-excitation type LED drive circuit, 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 inverse-excitation type LED drive circuit, comprise inductance L 1, inductance L 2, rectifier bridge Q, resistance R1, transformer T, triode Q2 and power switch pipe Q1, described inductance L 1 one end connects 220V alternating current one end, inductance L 1 other end connects electric capacity C11 and inductance L 2 respectively, inductance L 2 other end connects electric capacity C12 and rectifier bridge Q pin 1 respectively, rectifier bridge Q pin 3 connects the electric capacity C12 other end respectively, the electric capacity C11 other end and inductance L 3, inductance L 3 other end connects the 220V alternating current other end, rectifier bridge Q pin 2 is contact resistance R1 respectively, resistance R3, electric capacity C9, resistance R11 and transformer T coil L4, rectifier bridge Q pin 4 connects electric capacity C4, the electric capacity C4 other end is the contact resistance R1 other end respectively, resistance R6, chip U1 pin 3 and triode Q2 collector electrode, the resistance R6 other end connects diode D2 negative pole, diode D2 positive pole is contact resistance R10 and transformer T coil L5 respectively, the resistance R10 other end is contact resistance R9 and chip U1 pin 6 respectively, chip U1 pin 2 is the contact resistance R9 other end respectively, triode Q3 collector electrode, resistance R5, resistance R2 and the transformer T coil L5 other end ground connection, the resistance R2 other end is the contact resistance R5 other end respectively, the S pole of resistance R4 and power switch pipe Q1, the resistance R4 other end is the contact resistance R3 other end and chip U1 pin 4 respectively, the G pole contact resistance R14 of power switch pipe Q1, the resistance R14 other end is connecting triode Q2 emitter and triode Q3 emitter respectively, triode Q2 base stage connects diode Z1 negative pole respectively, triode Q3 base stage and chip U1 pin 1, the D pole of described power switch pipe Q1 connects diode D5 positive pole and the transformer T coil L4 other end respectively, diode D5 negative pole connects the electric capacity C9 other end and the resistance R11 other end respectively, transformer T coil L6 one end connects diode D1 positive pole, diode D1 negative pole connects electric capacity C5 respectively, resistance R7 and LED+, LED-connects the electric capacity C5 other end respectively, the resistance R7 other end and the transformer T coil L6 other end, described chip U1 model is AP3766.
As the utility model further scheme: described diode Z1 is voltage stabilizing didoe.
Compared with prior art, the beneficial effects of the utility model are: it is simple that the utility model inverse-excitation type LED drive circuit has circuit structure, Secure isolation, the advantage that cost is low, be particularly suitable for the requirement of low-power LED driving power, and adopt transformer primary side switch control rule mode, eliminate secondary output constant current constant voltage testing circuit and optocoupler, reduce further cost, improve system reliability and cost performance.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of inverse-excitation type LED drive circuit.
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, in the utility model embodiment, a kind of inverse-excitation type LED drive circuit, comprise inductance L 1, inductance L 2, rectifier bridge Q, resistance R1, transformer T, triode Q2 and power switch pipe Q1, inductance L 1 one end connects 220V alternating current one end, inductance L 1 other end connects electric capacity C11 and inductance L 2 respectively, inductance L 2 other end connects electric capacity C12 and rectifier bridge Q pin 1 respectively, rectifier bridge Q pin 3 connects the electric capacity C12 other end respectively, the electric capacity C11 other end and inductance L 3, inductance L 3 other end connects the 220V alternating current other end, rectifier bridge Q pin 2 is contact resistance R1 respectively, resistance R3, electric capacity C9, resistance R11 and transformer T coil L4, rectifier bridge Q pin 4 connects electric capacity C4, the electric capacity C4 other end is the contact resistance R1 other end respectively, resistance R6, chip U1 pin 3 and triode Q2 collector electrode, the resistance R6 other end connects diode D2 negative pole, diode D2 positive pole is contact resistance R10 and transformer T coil L5 respectively, the resistance R10 other end is contact resistance R9 and chip U1 pin 6 respectively, chip U1 pin 2 is the contact resistance R9 other end respectively, triode Q3 collector electrode, resistance R5, resistance R2 and the transformer T coil L5 other end ground connection, the resistance R2 other end is the contact resistance R5 other end respectively, the S pole of resistance R4 and power switch pipe Q1, the resistance R4 other end is the contact resistance R3 other end and chip U1 pin 4 respectively, the G pole contact resistance R14 of power switch pipe Q1, the resistance R14 other end is connecting triode Q2 emitter and triode Q3 emitter respectively, triode Q2 base stage connects diode Z1 negative pole respectively, triode Q3 base stage and chip U1 pin 1, the D pole of described power switch pipe Q1 connects diode D5 positive pole and the transformer T coil L4 other end respectively, diode D5 negative pole connects the electric capacity C9 other end and the resistance R11 other end respectively, transformer T coil L6 one end connects diode D1 positive pole, diode D1 negative pole connects electric capacity C5 respectively, resistance R7 and LED+, LED-connects the electric capacity C5 other end respectively, the resistance R7 other end and the transformer T coil L6 other end, described chip U1 model is AP3766.
Diode Z1 is voltage stabilizing didoe.
Operation principle of the present utility model is: refer to Fig. 1; resistance R1, R2 are the starting resistance of chip U1; be connected to the VCC pin of chip; a certain size starting current is provided to chip; D5, R11, C9 form the absorbing circuit of inverse-excitation type switch power-supply circuit; close at Q1 and have no progeny; absorb the peak voltage on switch; transformer T coil L5 is auxiliary winding; form the current supply circuit of chip U1 with D2, R6, C4, meanwhile, transformer T coil L5 voltage is through resistance R10, R9 dividing potential drop; be connected to 6 pin of chip, as detection and the open loop protection circuit of output voltage.
R2, R5 are the current sense resistor of Q1,4 pin of chip are connected to after R4, the i.e. current sample pin of U1,1 pin of chip U1 drives pin for exporting, through voltage-stabiliser tube Z1, be made up of the grid being connected to power switch pipe Q1 after totem drive circuit amplifies driving-energy Q2, Q3, control switch Q1 turns on and off.
To those skilled in the art, obvious the utility model is not limited to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present utility model or essential characteristic, can realize the utility model in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the utility model.Any Reference numeral in claim should be considered as the claim involved by limiting.
In addition, be to be understood that, although this specification is described according to execution mode, but not each execution mode only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should by specification integrally, and the technical scheme in each embodiment also through appropriately combined, can form other execution modes that it will be appreciated by those skilled in the art that.
Claims (2)
1. an inverse-excitation type LED drive circuit, comprise inductance L 1, inductance L 2, rectifier bridge Q, resistance R1, transformer T, triode Q2 and power switch pipe Q1, it is characterized in that, described inductance L 1 one end connects 220V alternating current one end, inductance L 1 other end connects electric capacity C11 and inductance L 2 respectively, inductance L 2 other end connects electric capacity C12 and rectifier bridge Q pin 1 respectively, rectifier bridge Q pin 3 connects the electric capacity C12 other end respectively, the electric capacity C11 other end and inductance L 3, inductance L 3 other end connects the 220V alternating current other end, rectifier bridge Q pin 2 is contact resistance R1 respectively, resistance R3, electric capacity C9, resistance R11 and transformer T coil L4, rectifier bridge Q pin 4 connects electric capacity C4, the electric capacity C4 other end is the contact resistance R1 other end respectively, resistance R6, chip U1 pin 3 and triode Q2 collector electrode, the resistance R6 other end connects diode D2 negative pole, diode D2 positive pole is contact resistance R10 and transformer T coil L5 respectively, the resistance R10 other end is contact resistance R9 and chip U1 pin 6 respectively, chip U1 pin 2 is the contact resistance R9 other end respectively, triode Q3 collector electrode, resistance R5, resistance R2 and the transformer T coil L5 other end ground connection, the resistance R2 other end is the contact resistance R5 other end respectively, the S pole of resistance R4 and power switch pipe Q1, the resistance R4 other end is the contact resistance R3 other end and chip U1 pin 4 respectively, the G pole contact resistance R14 of power switch pipe Q1, the resistance R14 other end is connecting triode Q2 emitter and triode Q3 emitter respectively, triode Q2 base stage connects diode Z1 negative pole respectively, triode Q3 base stage and chip U1 pin 1, the D pole of described power switch pipe Q1 connects diode D5 positive pole and the transformer T coil L4 other end respectively, diode D5 negative pole connects the electric capacity C9 other end and the resistance R11 other end respectively, transformer T coil L6 one end connects diode D1 positive pole, diode D1 negative pole connects electric capacity C5 respectively, resistance R7 and LED+, LED-connects the electric capacity C5 other end respectively, the resistance R7 other end and the transformer T coil L6 other end, described chip U1 model is AP3766.
2. inverse-excitation type LED drive circuit according to claim 1, is characterized in that, described diode Z1 is voltage stabilizing didoe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520560427.7U CN204887585U (en) | 2015-07-28 | 2015-07-28 | Turn over and swash formula LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520560427.7U CN204887585U (en) | 2015-07-28 | 2015-07-28 | Turn over and swash formula LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204887585U true CN204887585U (en) | 2015-12-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520560427.7U Expired - Fee Related CN204887585U (en) | 2015-07-28 | 2015-07-28 | Turn over and swash formula LED drive circuit |
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| Country | Link |
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| CN (1) | CN204887585U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106163014A (en) * | 2016-08-31 | 2016-11-23 | 周鸿德 | LED with inductance step-down |
| CN106533212A (en) * | 2016-12-03 | 2017-03-22 | 中国电子科技集团公司第四十三研究所 | Circuit topological structure of low-voltage input isolation type multi-circuit output switching power supply |
| CN108023490A (en) * | 2017-12-28 | 2018-05-11 | 佛山市三水汇明达光电设备有限公司 | A kind of on-off circuit that power output is improved using single-ended forward type drive circuit |
-
2015
- 2015-07-28 CN CN201520560427.7U patent/CN204887585U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106163014A (en) * | 2016-08-31 | 2016-11-23 | 周鸿德 | LED with inductance step-down |
| CN106533212A (en) * | 2016-12-03 | 2017-03-22 | 中国电子科技集团公司第四十三研究所 | Circuit topological structure of low-voltage input isolation type multi-circuit output switching power supply |
| CN108023490A (en) * | 2017-12-28 | 2018-05-11 | 佛山市三水汇明达光电设备有限公司 | A kind of on-off circuit that power output is improved using single-ended forward type drive circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| 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: 20151216 Termination date: 20170728 |