CN204559105U - A kind of switch power module protection circuit against input over-voltage - Google Patents
A kind of switch power module protection circuit against input over-voltage Download PDFInfo
- Publication number
- CN204559105U CN204559105U CN201520271785.6U CN201520271785U CN204559105U CN 204559105 U CN204559105 U CN 204559105U CN 201520271785 U CN201520271785 U CN 201520271785U CN 204559105 U CN204559105 U CN 204559105U
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- resistance
- control chip
- power module
- voltage
- high precision
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Abstract
A kind of switch power module protection circuit against input over-voltage, comprise transformer, the elementary Same Name of Ends of transformer and by control chip, metal-oxide-semiconductor, triode, high precision reference and resistance, the circuit that electric capacity connects into connects, the reference voltage source of control chip UC3842 inside is utilized to provide voltage accurately for overvoltage crowbar, around the overvoltage crowbar that this control chip is built, except guaranteeing that power module normally works, can also be more reasonable when selecting metal-oxide-semiconductor, be conducive to the loss reducing switching tube, improve the efficiency of power module, high precision reference has two effects in circuit, one is be used as a reference source, another is used as error to amplify, the utility model structure is simple, peripheral components is few, safe and reliable, flexible and convenient to use, operating efficiency is high.
Description
Technical field
The utility model relates to module switch power technique fields, particularly relates to a kind of switch power module protection circuit against input over-voltage.
Background technology
Along with the continuous progress of science and technology, Switching Power Supply, as a kind of voltage conversion circuit, is applied to the fields such as communication, information, household electrical appliances, national defence widely.The harm that the overtension inputted causes switch power module; be mainly reflected in the withstand voltage of device and bear lowest high-current value and exceed the normal scope that uses and damage; also it may be caused not meet corresponding requirements because electricity function index is destroyed; a kind of protection circuit against input over-voltage is provided; the reliability and stability of power module can be improved; in the prior art, there is the defects such as complex structure, cost is high, peripheral components is many in general switch power module protection circuit against input over-voltage.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the purpose of this utility model is to provide a kind of switch power module protection circuit against input over-voltage, and structure is simple, and peripheral components is few, safe and reliable, flexible and convenient to use, and operating efficiency is high.
In order to achieve the above object, the technical solution adopted in the utility model is:
A kind of switch power module protection circuit against input over-voltage, comprise transformer T1, the elementary Same Name of Ends of transformer T1 connects the drain electrode of metal-oxide-semiconductor Q1, the grid contact resistance R7 of metal-oxide-semiconductor Q1, 6 pin of the other end connection control chip U1 of resistance R7, the source electrode contact resistance R8 of metal-oxide-semiconductor Q1, one end of resistance R9, the other end ground connection of resistance R8, 3 pin of the other end connection control chip U1 of resistance R9, the emitter of the 8 pin connecting triode Q2 of control chip U1, one end of resistance R4, the base stage of the other end connecting triode Q2 of resistance R4, one end of resistance R3, the other end of resistance R3 connects the cathode terminal of high precision reference U2, the anode tap ground connection of high precision reference U2, the collector electrode contact resistance R5 of triode Q2, one end of resistance R6, 3 pin of the other end connection control chip U1 of resistance R5, the other end of resistance R6 connects the reference edge of high precision reference U2, the reference edge contact resistance R1 of high precision reference U2, one end of resistance R2, the other end ground connection of resistance R2, the other end of resistance R1 connects alternating current 220V rectification direct current anode out.
That described control chip U1 adopts is UC3842.
The beneficial effects of the utility model are:
1) protection circuit against input over-voltage of the present utility model is except guaranteeing that power module normally works, can also be more reasonable when selecting metal-oxide-semiconductor, is conducive to the loss reducing switching tube like this, improves the efficiency of power module.
2) high precision reference has two effects in circuit, and one is be used as a reference source, and another is used as error to amplify.
3) utilize the reference voltage source of control chip UC3842 inside, overvoltage crowbar provides voltage accurately for this reason, and the overvoltage crowbar structure of building around this control chip is simple, and cost is low, and performance safety is reliable.
Accompanying drawing explanation
Accompanying drawing is structural representation of the present utility model.
Embodiment
Below in conjunction with Figure of description, the utility model is further illustrated.
With reference to accompanying drawing, a kind of switch power module protection circuit against input over-voltage, comprise transformer T1, the elementary Same Name of Ends of transformer T1 connects the drain electrode of metal-oxide-semiconductor Q1, the grid contact resistance R7 of metal-oxide-semiconductor Q1, 6 pin of the other end connection control chip U1 of resistance R7, the source electrode contact resistance R8 of metal-oxide-semiconductor Q1, one end of resistance R9, the other end ground connection of resistance R8, 3 pin of the other end connection control chip U1 of resistance R9, the emitter of the 8 pin connecting triode Q2 of control chip U1, one end of resistance R4, the base stage of the other end connecting triode Q2 of resistance R4, one end of resistance R3, the other end of resistance R3 connects the cathode terminal of high precision reference U2, the anode tap ground connection of high precision reference U2, the collector electrode contact resistance R5 of triode Q2, one end of resistance R6, 3 pin of the other end connection control chip U1 of resistance R5, the other end of resistance R6 connects the reference edge of high precision reference U2, the reference edge contact resistance R1 of high precision reference U2, one end of resistance R2, the other end ground connection of resistance R2, the other end of resistance R1 connects alternating current 220V rectification direct current anode out.
That described control chip U1 adopts is UC3842.
Operation principle of the present utility model is: resistance R1 and resistance R2 forms sample circuit, high precision reference U2 and triode Q2 forms a reference source and error amplifier, reference edge voltage due to high precision reference U2 is 2.5V, when input voltage increase gradually be voltage on divider resistance R2 be greater than 2.5V time, high precision reference U2 and triode Q2 conducting, the 3 foot voltages of control chip U1 can be greater than 1V, the current comparator of its inside exports high level, output driving pulse is locked, metal-oxide-semiconductor Q1 will turn off, the voltage that metal-oxide-semiconductor Q1 is born is exactly input voltage, protected.When input voltage is under the condition of normal work, when the voltage on divider resistance R2 is less than 2.5V, high precision reference U2 and triode Q2 ends, not conducting, and control chip U1 normally works.The effect of resistance R3 and resistance R4 is stable operating point, after protective circuit action, in order to prevent the vibration of the power supply caused due to the fluctuation of input voltage, seals in resistance R6 between high precision reference U2 and the collector electrode of triode Q2, prevents vibration.Resistance R9 is the sampling resistor that electric current flows through metal-oxide-semiconductor Q1, is connected to 3 pin of control chip U1, can limits the peak current of metal-oxide-semiconductor Q1, and protection metal-oxide-semiconductor Q1, makes circuit performance reliable and stable.
Claims (2)
1. a switch power module protection circuit against input over-voltage, comprise transformer T1, it is characterized in that: the elementary Same Name of Ends of transformer T1 connects the drain electrode of metal-oxide-semiconductor Q1, the grid contact resistance R7 of metal-oxide-semiconductor Q1, 6 pin of the other end connection control chip U1 of resistance R7, the source electrode contact resistance R8 of metal-oxide-semiconductor Q1, one end of resistance R9, the other end ground connection of resistance R8, 3 pin of the other end connection control chip U1 of resistance R9, the emitter of the 8 pin connecting triode Q2 of control chip U1, one end of resistance R4, the base stage of the other end connecting triode Q2 of resistance R4, one end of resistance R3, the other end of resistance R3 connects the cathode terminal of high precision reference U2, the anode tap ground connection of high precision reference U2, the collector electrode contact resistance R5 of triode Q2, one end of resistance R6, 3 pin of the other end connection control chip U1 of resistance R5, the other end of resistance R6 connects the reference edge of high precision reference U2, the reference edge contact resistance R1 of high precision reference U2, one end of resistance R2, the other end ground connection of resistance R2, the other end of resistance R1 connects alternating current 220V rectification direct current anode out.
2. a kind of switch power module protection circuit against input over-voltage according to claim 1, is characterized in that: that described control chip U1 adopts is UC3842.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520271785.6U CN204559105U (en) | 2015-04-29 | 2015-04-29 | A kind of switch power module protection circuit against input over-voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520271785.6U CN204559105U (en) | 2015-04-29 | 2015-04-29 | A kind of switch power module protection circuit against input over-voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204559105U true CN204559105U (en) | 2015-08-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520271785.6U Expired - Fee Related CN204559105U (en) | 2015-04-29 | 2015-04-29 | A kind of switch power module protection circuit against input over-voltage |
Country Status (1)
| Country | Link |
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| CN (1) | CN204559105U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114554648A (en) * | 2022-02-28 | 2022-05-27 | 深圳利普芯微电子有限公司 | Control circuit, overvoltage protection circuit, control chip and driving power supply |
-
2015
- 2015-04-29 CN CN201520271785.6U patent/CN204559105U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114554648A (en) * | 2022-02-28 | 2022-05-27 | 深圳利普芯微电子有限公司 | Control circuit, overvoltage protection circuit, control chip and driving power supply |
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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 |
Granted publication date: 20150812 Termination date: 20180429 |
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| CF01 | Termination of patent right due to non-payment of annual fee |