CN203632566U - Secondary feedback effective integrated multi-protection constant-voltage control circuit for LED driving - Google Patents
Secondary feedback effective integrated multi-protection constant-voltage control circuit for LED driving Download PDFInfo
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- CN203632566U CN203632566U CN201320739243.8U CN201320739243U CN203632566U CN 203632566 U CN203632566 U CN 203632566U CN 201320739243 U CN201320739243 U CN 201320739243U CN 203632566 U CN203632566 U CN 203632566U
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Abstract
The utility model discloses a secondary feedback effective integrated multi-protection constant-voltage control circuit for LED driving. The secondary feedback effective integrated multi-protection constant-voltage control circuit comprises an alternating-current input end, a direct-current output end, a rectifying circuit, and a first transformer having a primary winding and a secondary winding. The alternating-current input end is connected to the primary winding of the first transformer through the rectifying circuit. The direct-current output end is connected to the secondary winding of the first transformer. A TOP267EG chip, an input undervoltage and overvoltage shutdown protection circuit, a secondary overvoltage shutdown protection circuit, a overcurrent and overload detection protection circuit and a short-circuit and open-circuit protection circuit are further comprised. An overheat shutdown module is arranged in the TOP267EG chip. The input undervoltage and overvoltage shutdown protection circuit is connected between the first pin of the TOP267EG chip and the output end of the rectifying circuit. The secondary overvoltage shutdown protection circuit is connected between the first pin of the TOP267EG chip and the direct-current output end. According to the utility model, the sensitivity can be improved, the voltage can be controlled accurately, the peripheral circuit can be simplified, the power consumption can be reduced, and the production and assembly cost can be reduced.
Description
[technical field]
The utility model relates to the design of constant-pressure type switching power circuit, is specifically related to the secondary feedback PWM control circuit of constant-pressure type.
[background technology]
Flyback LED driver is simple in structure with it; cheap high reliability; be widely used in middle low power LED constant voltage driver, but there is the shortcomings such as efficiency is not high, ripple is large, caloric value is large, and voltage loads stability is not high in it; thereby cause sensitivity lower; need complicated peripheral circuit to complete various defencive functions, circuit power consumption is higher, and conversion efficiency is low; production assembly cost is high, and versatility is not strong.
[utility model content]
The purpose of this utility model solves the problems of the prior art exactly, proposes a kind of efficient integrated multiple protective constant-voltage control circuit of secondary feedback driving for LED, can improve sensitivity; accurately control voltage; peripheral circuits, reduces power consumption, reduces production assembly cost.
For achieving the above object, the utility model proposes a kind of efficient integrated multiple protective constant-voltage control circuit of secondary feedback driving for LED, comprise ac input end, DC output end, rectification circuit, there is the first transformer of armature winding and secondary winding, described ac input end is connected to the armature winding of the first transformer after rectification circuit, DC output end is connected to the secondary winding of the first transformer, also comprise TOP267EG chip, input undervoltage overvoltage cut-off protection circuit, secondary overvoltage cut-off protection circuit, over-current and-load detects protective circuit, short circuit open loop protection circuit, in described TOP267EG chip, be built-in with overheated shutoff module, between the first pin of described TOP267EG chip and rectification circuit output end, be connected with input undervoltage overvoltage cut-off protection circuit, between the first pin of TOP267EG chip and DC output end, be connected with secondary overvoltage cut-off protection circuit, between the second pin of TOP267EG chip and the output of the first transformer, be connected with over-current and-load and detect protective circuit, between the 3rd pin of TOP267EG chip and DC output end, be connected with short circuit open loop protection circuit.
As preferably, described input undervoltage overvoltage cut-off protection circuit comprises the 6th resistance and the 7th resistance, after described the 6th resistance and the series connection of the 7th resistance, is connected between the first pin and rectification circuit output end that is connected to TOP267EG chip.
As preferably; described secondary overvoltage cut-off protection circuit comprises the 6th diode, the 15 resistance, the 14 resistance, the second optocoupler, the 3rd diode, the 9th resistance; the input of described the second optocoupler is parallel with the 14 resistance; between the input cathode of the second optocoupler and the positive pole of DC output end, be in series with the 15 resistance and the 6th diode; the input anode of the second optocoupler is connected to the negative pole of DC output end, is in series with the 3rd diode and the 9th resistance between the output of described the second optocoupler and the first pin of TOP267EG chip.
As preferably, described over-current and-load detects protective circuit and comprises the 5th resistance, and described the 5th resistance is connected between the second pin of TOP267EG chip and the output of the first transformer.
As preferably, described short circuit open loop protection circuit comprises the first optocoupler, the 11 resistance, the tenth resistance, the 12 resistance, the 13 resistance, the 15 electric capacity and the first triode, the base stage of described the first triode is connected to the negative pole of DC output end, between the emitter of the first triode and the positive pole of DC output end, be in series with the 12 resistance, between the emitter of the first triode and base stage, be in series with the 13 resistance, between the emitter of the first triode and collector electrode, be in series with the 15 electric capacity, the collector electrode of the first triode is connected to the input anode of the first optocoupler, between the input anode of the first optocoupler and input cathode, be in series with the 11 resistance, the input cathode of the first optocoupler is connected to the positive pole of DC output end, the output of the first optocoupler is connected to the 3rd pin of TOP267EG chip.
The beneficial effects of the utility model: the utility model control section does not adopt separating component design, but adopt the point-device TOP267EG chip of constant voltage overcurrent, secondary direct feedback sensitivity high voltage stability precision is high, in the time that inferior voltage raises, TOP267EG chip can be braked reduction duty ratio, and make to export secondary output voltage and reduce, otherwise in the time that output voltage reduces, duty ratio can raise, and makes voltage stabilization.Just can complete various defencive functions without complicated peripheral circuit, control TOP267EG chip internal integrated very abundant defencive function, comprise input undervoltage, overvoltage, output overcurrent, overload, overheated, output overvoltage, short circuit, open circuit etc.Simultaneously simple peripheral circuit can also effectively reduce power consumption, promotes the conversion efficiency of whole product, and not only circuit is simple, and production assembly cost is low, and product is easy to use, highly versatile.
Feature of the present utility model and advantage will be elaborated by reference to the accompanying drawings by embodiment.
[accompanying drawing explanation]
Fig. 1 is the theory diagram of a kind of efficient integrated multiple protective constant-voltage control circuit of secondary feedback driving for LED of the utility model.
Fig. 2 is the circuit theory diagrams of a kind of efficient integrated multiple protective constant-voltage control circuit of secondary feedback driving for LED of the utility model.
In figure: 1-input undervoltage overvoltage cut-off protection circuit, 2-level overvoltage cut-off protection circuit, 3-over-current and-load detect protective circuit, 4-short circuit open loop protection circuit, the overheated shutoff module of 5-, 6-rectification circuit, 7-ac input end, 8-DC output end.
[embodiment]
Consult Fig. 1, the efficient integrated multiple protective constant-voltage control circuit of secondary feedback driving for LED, comprise ac input end 7, DC output end 8, rectification circuit 6, there is the first transformer T1 of armature winding and secondary winding, described ac input end 7 is connected to the armature winding of the first transformer T1 after rectification circuit 6, DC output end 8 is connected to the secondary winding of the first transformer T1, also comprise TOP267EG chip U1, input undervoltage overvoltage cut-off protection circuit 1, secondary overvoltage cut-off protection circuit 2, over-current and-load detects protective circuit 3, short circuit open loop protection circuit 4, in described TOP267EG chip U1, be built-in with overheated shutoff module 5, between the first pin of described TOP267EG chip U1 and rectification circuit 6 outputs, be connected with input undervoltage overvoltage cut-off protection circuit 1, between the first pin of TOP267EG chip U1 and DC output end 8, be connected with secondary overvoltage cut-off protection circuit 2, between the second pin of TOP267EG chip U1 and the output of the first transformer T1, be connected with over-current and-load and detect protective circuit 3, between the 3rd pin of TOP267EG chip U1 and DC output end 8, be connected with short circuit open loop protection circuit 4.
Consult Fig. 2, exchange live wire and connect the first capacitor C 1, the first resistance R 1 by fusible link F1, and connect the second transformer T2 input, the second transformer T2 output connects the second capacitor C 2, the second capacitor C 2 ground connection, then connect piezo-resistance ZNR1, the 3rd capacitor C 3, the first rectifier bridge stack D1.Described interchange input zero line connects the first capacitor C 1, the first resistance R 1, the second transformer T2 input, the second transformer T2 output connects thermistor RTH1 input, thermistor RTH1 output connects piezo-resistance ZNR1, connect again the 3rd capacitor C 3, rectifier bridge stack D1, the 4th capacitor C 4, the 4th capacitor C 4 ground connection, rectifier bridge stack D1 output plus terminal in rectification circuit 6 connects the 6th capacitor C 6, the 6th capacitor C 6 is electrochemical capacitor, anodal the 6th resistance R 6, the 7th capacitor C 7, the second resistance R 2, the 3rd resistance R 3 of connecting.One end of capacitor C Y1 connects the first transformer T1 armature winding input, the other end of capacitor C Y1 connects secondary negative pole, rectifier bridge stack D1 negative pole of output end connects the 6th capacitor C 6 negative poles, and the 6th capacitor C 6 negative poles connect S pin, the 5th resistance R 5, the 8th capacitor C 8, the 9th capacitor C 9, the first transformer T1 of TOP267EG chip U1.The tenth capacitor C 10 bias input ends, biasing output connects the 4th diode D4, the 4th diode D4 connects the tenth capacitor C 10, the 5th resistance R 5 connects the X pin of TOP267EG chip U1, the F pin of TOP267EG chip U1 connects C pin, the C pin of TOP267EG chip U1 connects the 8th capacitor C 8, the 8th resistance R 8, the second optocoupler U2, the 8th resistance R 8, the 9th capacitor C 9, the V pin of TOP267EG chip U1 connects the 7th resistance R 7, the 7th resistance R 7 connects the 6th resistance R 6, the D pin of TOP267EG chip U1 connects the first magnet ring L1, the first transformer T1, the D pin of TOP267EG chip U1 connects the second diode D2, the second diode D2 connects the 4th resistance R 4, the 7th capacitor C 7, the second resistance R 2, after the 3rd resistance R 3 parallel connections, be connected between the 4th resistance R 4 and the first transformer T1 input, the output of the second optocoupler U3, the 3rd diode D3, the 9th resistance R 9 is once connected.
The utility model DC output end 8 adopts following circuit design, one end of described secondary winding is by the 5th diode D5, the 16 resistance R 16 is in parallel with the 5th diode D5 after connecting with the 11 capacitor C 11, the second inductance L 2 is connected to the positive pole of DC output end 8, between the positive pole of DC output end 8 and negative pole, be parallel with the 14 capacitor C 14, between one end of the negative pole of DC output end 8 and the second inductance L 2, be parallel with the 13 capacitor C 13, the 12 capacitor C 12, described the 14 capacitor C 14, the 13 capacitor C 13, the 12 capacitor C 12 is electrochemical capacitor, the 16 capacitor C 16 1 termination negative poles, one end ground connection, secondary voltage stabilizing feedback resistance (that is: the tenth resistance R 10) connects the first optocoupler U2, the 11 resistance R 11, the 15 capacitor C 15, the first triode Q1, the 13 resistance R 13, the negative pole of DC output end 8, the first optocoupler U2 connects the 12 resistance R 12, the 15 capacitor C 15, the positive pole of DC output end 8.Secondary overvoltage cut-off protection circuit 2 comprises the 6th diode D6, the 15 resistance R 15, the 14 resistance R 14, the second optocoupler U3, the 3rd diode D3, the 9th resistance R 9, the input of described the second optocoupler U3 is parallel with the 14 resistance R 14, between the positive pole of the input cathode of the second optocoupler U3 and DC output end 8, be in series with the 15 resistance R 15 and the 6th diode D6, the input anode of the second optocoupler U3 is connected to the negative pole of DC output end 8, between the first pin of the output of described the second optocoupler U3 and TOP267EG chip U1, be in series with the 3rd diode D3 and the 9th resistance R 9.
Defencive function output overvoltage of the present utility model under-voltage protection utilizes the step-down of connecting of the 6th resistance R 6, the 7th resistance R 7; feed back to the V pin of TOP267EG chip U1; when input voltage exceedes design voltage, TOP267EG chip automatically shuts down output; braking reset when input voltage drops to normal design value; the V pin of same TOP267EG chip U1 also can turn-off output while detecting input voltage lower than design load, after input voltage is normal, braking is restored.The inner integrated overheated shutoff module 5 of TOP267EG chip U1, in the time that ambient temperature rises, the temperature of TOP267EG chip U1 also can rise, and after arrival set point, TOP267EG chip U1 automatically shuts down output, until temperature drops to braking reset after normal value.
It is to provide overcurrent protection by the 5th resistance R 5 on the X pin of TOP267EG chip U1 that over-current and-load detects protective circuit 3, exports hiccup protections in the time that output current exceedes set point, and exceptional condition removes rear braking and restores.Short-circuit protection is to be completed by the C pin of voltage stabilizing partial feedback TOP267EG chip U1; comprise the tenth resistance R the 10, the 11 resistance R the 11, the 12 resistance R the 12, the 13 resistance R the 13, the 15 capacitor C 15, the first triode Q1; the first optocoupler U2 completes but output short circuit; output dc voltage is dragged down at once; the C pin of TOP267EG chip U1 does not have feedback signal; at this moment just have the hiccups pattern protection of rebooting status always of TOP267EG chip U1, until exceptional condition removes braking reset.Open-circuit-protection is that secondary nothing feeds back signal to TOP267EG chip U1 in the time of any original paper open circuit of secondary output end, and TOP267EG chip U1 just can enter restarts guard mode until open circuit brake off resets.In the time that output voltage raises extremely; while exceeding the voltage that the 6th diode D6 can bear; D6 is breakdown; electric current is given the second optocoupler U3 power supply by the 6th diode D6, the 15 resistance R 15 current limlitings, and the second optocoupler U3 time grade just has electric current and flows through, and prevents that electric current is counter flow by the 3rd diode D3; by the V pin of the 9th resistance R 9 to TOP267EG chip U1; V pin electric current exceedes setting ceiling voltage, just can automatically shut down and realize overvoltage protection, braking reset after abnormal inferior condition removes.
The utility model application drives with constant pressure type LED, general constant pressure type electronic equipment.
Finally explanation: above embodiment is only for illustrating the utility model and unrestricted the described technical scheme of practicality, although therefore this specification has done detailed explanation with reference to above-mentioned each embodiment to the utility model, but it will be understood by those of skill in the art that still and can the utility model be modified or be replaced on an equal basis; And all do not depart from technical scheme and the improvement thereof of spirit and scope of the present utility model, it all should be contained within the scope of claim of the present utility model.
Claims (5)
1. the efficient integrated multiple protective constant-voltage control circuit of secondary feedback driving for LED, comprise ac input end (7), DC output end (8), rectification circuit (6), there is first transformer (T1) of armature winding and secondary winding, described ac input end (7) is connected to the armature winding of the first transformer (T1) after rectification circuit (6), DC output end (8) is connected to the secondary winding of the first transformer (T1), it is characterized in that: also comprise TOP267EG chip (U1), input undervoltage overvoltage cut-off protection circuit (1), secondary overvoltage cut-off protection circuit (2), over-current and-load detects protective circuit (3), short circuit open loop protection circuit (4), in described TOP267EG chip (U1), be built-in with overheated shutoff module (5), between the first pin of described TOP267EG chip (U1) and rectification circuit (6) output, be connected with input undervoltage overvoltage cut-off protection circuit (1), between the first pin of TOP267EG chip (U1) and DC output end (8), be connected with secondary overvoltage cut-off protection circuit (2), between the output of the second pin of TOP267EG chip (U1) and the first transformer (T1), be connected with over-current and-load and detect protective circuit (3), between the 3rd pin of TOP267EG chip (U1) and DC output end (8), be connected with short circuit open loop protection circuit (4).
2. a kind of efficient integrated multiple protective constant-voltage control circuit of secondary feedback driving for LED as claimed in claim 1; it is characterized in that: described input undervoltage overvoltage cut-off protection circuit (1) comprises the 6th resistance (R6) and the 7th resistance (R7), after described the 6th resistance (R6) and the series connection of the 7th resistance (R7), be connected between the first pin and rectification circuit (6) output that is connected to TOP267EG chip (U1).
3. a kind of efficient integrated multiple protective constant-voltage control circuit of secondary feedback driving for LED as claimed in claim 1, it is characterized in that: described secondary overvoltage cut-off protection circuit (2) comprises the 6th diode (D6), the 15 resistance (R15), the 14 resistance (R14), the second optocoupler (U3), the 3rd diode (D3), the 9th resistance (R9), the input of described the second optocoupler (U3) is parallel with the 14 resistance (R14), between the positive pole of the input cathode of the second optocoupler (U3) and DC output end (8), be in series with the 15 resistance (R15) and the 6th diode (D6), the input anode of the second optocoupler (U3) is connected to the negative pole of DC output end (8), between the first pin of the output of described the second optocoupler (U3) and TOP267EG chip (U1), be in series with the 3rd diode (D3) and the 9th resistance (R9).
4. a kind of efficient integrated multiple protective constant-voltage control circuit of secondary feedback driving for LED as claimed in claim 1; it is characterized in that: described over-current and-load detects protective circuit (3) and comprises the 5th resistance (R5), and described the 5th resistance (R5) is connected between the second pin of TOP267EG chip (U1) and the output of the first transformer (T1).
5. a kind of efficient integrated multiple protective constant-voltage control circuit of secondary feedback driving for LED as described in any one in claim 1 to 4, it is characterized in that: described short circuit open loop protection circuit (4) comprises the first optocoupler (U2), the 11 resistance (R11), the tenth resistance (R10), the 12 resistance (R12), the 13 resistance (R13), the 15 electric capacity (C15) and the first triode (Q1), the base stage of described the first triode (Q1) is connected to the negative pole of DC output end (8), between the positive pole of the emitter of the first triode (Q1) and DC output end (8), be in series with the 12 resistance (R12), between the emitter of the first triode (Q1) and base stage, be in series with the 13 resistance (R13), between the emitter of the first triode (Q1) and collector electrode, be in series with the 15 electric capacity (C15), the collector electrode of the first triode (Q1) is connected to the input anode of the first optocoupler (U2), between the input anode of the first optocoupler (U2) and input cathode, be in series with the 11 resistance (R11), the input cathode of the first optocoupler (U2) is connected to the positive pole of DC output end (8), the output of the first optocoupler (U2) is connected to the 3rd pin of TOP267EG chip (U1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320739243.8U CN203632566U (en) | 2013-11-21 | 2013-11-21 | Secondary feedback effective integrated multi-protection constant-voltage control circuit for LED driving |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320739243.8U CN203632566U (en) | 2013-11-21 | 2013-11-21 | Secondary feedback effective integrated multi-protection constant-voltage control circuit for LED driving |
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| Publication Number | Publication Date |
|---|---|
| CN203632566U true CN203632566U (en) | 2014-06-04 |
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| CN201320739243.8U Expired - Fee Related CN203632566U (en) | 2013-11-21 | 2013-11-21 | Secondary feedback effective integrated multi-protection constant-voltage control circuit for LED driving |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242697B (en) * | 2014-09-05 | 2017-04-26 | 来安县新元机电设备设计有限公司 | Switching power supply circuit and device |
| CN108809282A (en) * | 2018-05-31 | 2018-11-13 | 合肥同智机电控制技术有限公司 | A kind of DC switch circuit |
| CN110049594A (en) * | 2019-04-10 | 2019-07-23 | 欧普照明股份有限公司 | A kind of load overvoltage protection circuit and protection chip |
| CN110266092A (en) * | 2019-06-03 | 2019-09-20 | 东莞启益电器机械有限公司 | A kind of output short-circuit no-spark generates and zero-voltage batteries charging circuit |
-
2013
- 2013-11-21 CN CN201320739243.8U patent/CN203632566U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242697B (en) * | 2014-09-05 | 2017-04-26 | 来安县新元机电设备设计有限公司 | Switching power supply circuit and device |
| CN108809282A (en) * | 2018-05-31 | 2018-11-13 | 合肥同智机电控制技术有限公司 | A kind of DC switch circuit |
| CN108809282B (en) * | 2018-05-31 | 2022-01-28 | 合肥同智机电控制技术有限公司 | Direct current switch circuit |
| CN110049594A (en) * | 2019-04-10 | 2019-07-23 | 欧普照明股份有限公司 | A kind of load overvoltage protection circuit and protection chip |
| CN110266092A (en) * | 2019-06-03 | 2019-09-20 | 东莞启益电器机械有限公司 | A kind of output short-circuit no-spark generates and zero-voltage batteries charging circuit |
| CN110266092B (en) * | 2019-06-03 | 2024-04-12 | 东莞启益电器机械有限公司 | Output short circuit no spark produces and battery zero voltage charging circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140604 Termination date: 20141121 |
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| EXPY | Termination of patent right or utility model |