CN204205929U - A kind of high-performance module switch power circuit with overvoltage protection - Google Patents
A kind of high-performance module switch power circuit with overvoltage protection Download PDFInfo
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- CN204205929U CN204205929U CN201420688252.3U CN201420688252U CN204205929U CN 204205929 U CN204205929 U CN 204205929U CN 201420688252 U CN201420688252 U CN 201420688252U CN 204205929 U CN204205929 U CN 204205929U
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Abstract
The utility model relates to a kind of high-performance module switch power circuit with overvoltage protection.The utility model comprises rectifier bridge Q, chip U2, transformer T and controllable accurate source of stable pressure U1.The voltage that the utility model utilizes the intrinsic reference voltage source of UC3842 chip to provide and controllable accurate source of stable pressure TL431; use controllable accurate source of stable pressure TL431 is double does benchmark and error amplification; utilize the intrinsic reference voltage source in the inside of UC3842 chip to provide voltage for protective circuit, make whole circuit structure simple, with low cost and stable performance.
Description
Technical field
The utility model relates to a kind of switching power circuit, specifically a kind of high-performance module switch power circuit with overvoltage protection.
Background technology
Along with the development of electronic technology; there is the control chip of polytype Switching Power Supply; when forming DC/DC or AC/DC switch change device; UC3842 is the current-mode control chip released the earliest; UC3842 self has current sense comparator; output overcurrent and short-circuit protection can be realized; its inner intrinsic input undervoltage lock current also can realize input undervoltage protection easily; but but not from tape input over-voltage protecting function, so become the emphasis of people's research based on the protection circuit against input over-voltage of UC3842 Switching Power Supply.
Summary of the invention
The purpose of this utility model is to provide that a kind of circuit structure is simple, with low cost, the high-performance module switch power circuit of the band overvoltage protection based on UC3842 of Nover practical, 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 high-performance module switch power circuit with overvoltage protection, comprise rectifier bridge Q, chip U2, transformer T and controllable accurate source of stable pressure U1, described rectifier bridge Q pin 1, pin 4 connects 220V both ends of power respectively, rectifier bridge Q pin 2 connects electric capacity C2 respectively, resistance R10, electric capacity C7, transformer T coil L2 and resistance R1, rectifier bridge Q pin 3 connects the electric capacity C2 other end respectively, resistance R2, the A pole of controllable accurate source of stable pressure U1, electric capacity C5, electric capacity C4, chip U2 pin 5 and resistance RS ground connection, the described resistance R1 other end is the contact resistance R2 other end respectively, the R pole of resistance R6 and controllable accurate source of stable pressure U1, the resistance R6 other end is contact resistance R5 and triode VT1 collector electrode respectively, triode VT1 base stage is contact resistance R4 and resistance R3 respectively, the resistance R3 other end connects the K pole of controllable accurate source of stable pressure U1, the described resistance R4 other end is connecting triode VT1 emitter respectively, resistance R9 and chip U2 pin 8, chip U2 pin 4 is the contact resistance R9 other end and the electric capacity C5 other end respectively, chip U2 pin 3 is contact resistance R8 respectively, the electric capacity C4 other end and the resistance R5 other end, the S pole of the resistance R8 other end difference contact resistance RS other end and switching tube VT2, described chip U2 pin 6 is by the G pole of resistance R7 connecting valve pipe VT2, D pole contact resistance R11 and the transformer T coil L2 other end respectively of switching tube VT2, the resistance R11 other end connects the electric capacity C7 other end, the described resistance R10 other end connects ground capacity C1 respectively, diode VD1 negative pole and chip U2 pin 7, diode VD1 positive pole connects grounded inductor L1, described chip U2 pin 2 connects chip U2 pin 1 by electric capacity C3, described transformer T coil L3 one end connects electric capacity C6 and output terminals A respectively, the transformer T coil L3 other end connects the electric capacity C6 other end and output B respectively.
As further program of the utility model: described controllable accurate source of stable pressure U1 model is TL431, and described chip U2 model is UC3842.
As the utility model further scheme: described resistance R1 ~ R6, chip U1 and triode VT1 form protection circuit against input over-voltage, described controllable accurate source of stable pressure U1 and triode VT1 forms a reference source and error amplifier.
Compared with prior art; the beneficial effects of the utility model are: the voltage that the utility model utilizes the intrinsic reference voltage source of UC3842 chip to provide and controllable accurate source of stable pressure TL431; use controllable accurate source of stable pressure TL431 is double does benchmark and error amplification; utilize the intrinsic reference voltage source in the inside of UC3842 chip to provide voltage for protective circuit, make whole circuit structure simple, with low cost and stable performance.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the high-performance module switch power circuit of band overvoltage protection.
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 high-performance module switch power circuit with overvoltage protection, comprise rectifier bridge Q, chip U2, transformer T and controllable accurate source of stable pressure U1, rectifier bridge Q pin 1, pin 4 connects 220V both ends of power respectively, rectifier bridge Q pin 2 connects electric capacity C2 respectively, resistance R10, electric capacity C7, transformer T coil L2 and resistance R1, rectifier bridge Q pin 3 connects the electric capacity C2 other end respectively, resistance R2, the A pole of controllable accurate source of stable pressure U1, electric capacity C5, electric capacity C4, chip U2 pin 5 and resistance RS ground connection, the resistance R1 other end is the contact resistance R2 other end respectively, the R pole of resistance R6 and controllable accurate source of stable pressure U1, the resistance R6 other end is contact resistance R5 and triode VT1 collector electrode respectively, triode VT1 base stage is contact resistance R4 and resistance R3 respectively, the resistance R3 other end connects the K pole of controllable accurate source of stable pressure U1, the resistance R4 other end is connecting triode VT1 emitter respectively, resistance R9 and chip U2 pin 8, chip U2 pin 4 is the contact resistance R9 other end and the electric capacity C5 other end respectively, chip U2 pin 3 is contact resistance R8 respectively, the electric capacity C4 other end and the resistance R5 other end, the S pole of the resistance R8 other end difference contact resistance RS other end and switching tube VT2, chip U2 pin 6 is by the G pole of resistance R7 connecting valve pipe VT2, D pole contact resistance R11 and the transformer T coil L2 other end respectively of switching tube VT2, the resistance R11 other end connects the electric capacity C7 other end, the resistance R10 other end connects ground capacity C1 respectively, diode VD1 negative pole and chip U2 pin 7, diode VD1 positive pole connects grounded inductor L1, chip U2 pin 2 connects chip U2 pin 1 by electric capacity C3, transformer T coil L3 one end connects electric capacity C6 and output terminals A respectively, the transformer T coil L3 other end connects the electric capacity C6 other end and output B respectively.
Controllable accurate source of stable pressure U1 model is TL431, and chip U2 model is UC3842.
Operation principle of the present utility model is: resistance R1 ~ R6, chip U1 and triode VT1 form protection circuit against input over-voltage, when input voltage exceedes set point, triode VT1 conducting makes the voltage of the pin 3 of chip U2 more than 1V, output driving pulse is blocked, the voltage that switching tube VT2 is born is only input voltage, switching tube VT2 is protected, the current/voltage that the electric current flowing through switching tube VT2 is set up on sample resistance RS is input to the pin 3 of chip U2, can limit by switch tube VT2 peak current, thus realize output overcurrent or short-circuit protection; Controllable accurate source of stable pressure U1 and triode VT1 forms a reference source and error amplifier, when input voltage increase gradually make the voltage of divider resistance R2 be greater than 2.5V time, controllable accurate source of stable pressure U1 and triode VT1 conducting, pin 3 voltage of chip U2 will be greater than 1V, the electric circuit inspection comparator of its inside exports high level, output driving pulse is blocked, when input voltage is in normal operating voltage range, voltage on divider resistance R2 is less than 2.5V, controllable accurate source of stable pressure U1 and triode VT1 not conducting, chip U2 is just in normal operating conditions.After protective circuit action, in order to prevent the vibration causing power supply due to the fluctuation of input power, in input protection circuit, introduce the resistance R6 preventing from vibrating.
Claims (3)
1. the high-performance module switch power circuit with overvoltage protection, comprise rectifier bridge Q, chip U2, transformer T and controllable accurate source of stable pressure U1, it is characterized in that, described rectifier bridge Q pin 1, pin 4 connects 220V both ends of power respectively, rectifier bridge Q pin 2 connects electric capacity C2 respectively, resistance R10, electric capacity C7, transformer T coil L2 and resistance R1, rectifier bridge Q pin 3 connects the electric capacity C2 other end respectively, resistance R2, the A pole of controllable accurate source of stable pressure U1, electric capacity C5, electric capacity C4, chip U2 pin 5 and resistance RS ground connection, the described resistance R1 other end is the contact resistance R2 other end respectively, the R pole of resistance R6 and controllable accurate source of stable pressure U1, the resistance R6 other end is contact resistance R5 and triode VT1 collector electrode respectively, triode VT1 base stage is contact resistance R4 and resistance R3 respectively, the resistance R3 other end connects the K pole of controllable accurate source of stable pressure U1, the described resistance R4 other end is connecting triode VT1 emitter respectively, resistance R9 and chip U2 pin 8, chip U2 pin 4 is the contact resistance R9 other end and the electric capacity C5 other end respectively, chip U2 pin 3 is contact resistance R8 respectively, the electric capacity C4 other end and the resistance R5 other end, the S pole of the resistance R8 other end difference contact resistance RS other end and switching tube VT2, described chip U2 pin 6 is by the G pole of resistance R7 connecting valve pipe VT2, D pole contact resistance R11 and the transformer T coil L2 other end respectively of switching tube VT2, the resistance R11 other end connects the electric capacity C7 other end, the described resistance R10 other end connects ground capacity C1 respectively, diode VD1 negative pole and chip U2 pin 7, diode VD1 positive pole connects grounded inductor L1, described chip U2 pin 2 connects chip U2 pin 1 by electric capacity C3, described transformer T coil L3 one end connects electric capacity C6 and output terminals A respectively, the transformer T coil L3 other end connects the electric capacity C6 other end and output B respectively.
2. the high-performance module switch power circuit of band overvoltage protection according to claim 1, is characterized in that, described controllable accurate source of stable pressure U1 model is TL431, and described chip U2 model is UC3842.
3. the high-performance module switch power circuit of band overvoltage protection according to claim 1; it is characterized in that; described resistance R1 ~ R6, chip U1 and triode VT1 form protection circuit against input over-voltage, and described controllable accurate source of stable pressure U1 and triode VT1 forms a reference source and error amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420688252.3U CN204205929U (en) | 2014-11-17 | 2014-11-17 | A kind of high-performance module switch power circuit with overvoltage protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420688252.3U CN204205929U (en) | 2014-11-17 | 2014-11-17 | A kind of high-performance module switch power circuit with overvoltage protection |
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| Publication Number | Publication Date |
|---|---|
| CN204205929U true CN204205929U (en) | 2015-03-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420688252.3U Expired - Fee Related CN204205929U (en) | 2014-11-17 | 2014-11-17 | A kind of high-performance module switch power circuit with overvoltage protection |
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| CN (1) | CN204205929U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105553247A (en) * | 2015-12-31 | 2016-05-04 | 北京格林伟迪科技股份有限公司 | Output overvoltage hiccup protection apparatus for switch power supply |
| CN108807306A (en) * | 2018-07-02 | 2018-11-13 | 山东晶导微电子股份有限公司 | A kind of novel power supply power module architectures of band input protection |
-
2014
- 2014-11-17 CN CN201420688252.3U patent/CN204205929U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105553247A (en) * | 2015-12-31 | 2016-05-04 | 北京格林伟迪科技股份有限公司 | Output overvoltage hiccup protection apparatus for switch power supply |
| CN105553247B (en) * | 2015-12-31 | 2018-08-17 | 北京格林伟迪科技股份有限公司 | The output overvoltage hiccup protections device of Switching Power Supply |
| CN108807306A (en) * | 2018-07-02 | 2018-11-13 | 山东晶导微电子股份有限公司 | A kind of novel power supply power module architectures of band input protection |
| CN108807306B (en) * | 2018-07-02 | 2024-02-13 | 山东晶导微电子股份有限公司 | Power module structure with input protection |
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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: 20150311 Termination date: 20161117 |