CN202940734U - Switching power supply - Google Patents
Switching power supply Download PDFInfo
- Publication number
- CN202940734U CN202940734U CN 201220652345 CN201220652345U CN202940734U CN 202940734 U CN202940734 U CN 202940734U CN 201220652345 CN201220652345 CN 201220652345 CN 201220652345 U CN201220652345 U CN 201220652345U CN 202940734 U CN202940734 U CN 202940734U
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- circuit
- resistance
- power supply
- switching
- switching power
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Abstract
Disclosed is a switching power supply which comprises an input filter and rectifier circuit, a switching circuit, a control circuit, a transformer transformation circuit, an output filter and rectifier circuit and a voltage feedback circuit and further comprises an over-voltage protection circuit. The input filter and rectifier circuit is connected with the transformer transformation circuit and the over-voltage protection circuit; the switching circuit is connected with the transformer transformation circuit and the control circuit; the output filter and rectifier circuit is connected with a load and is connected with the control circuit through the voltage feedback circuit; the over-voltage protection circuit is connected with the control circuit; and when the switching circuit inputs over voltage, the control circuit controls the switching circuit to be switched off under the instruction of the over-voltage protection circuit. Due to the adoption of the technical scheme, the over-voltage protection circuit sends an instruction to the control circuit to switch off the switching circuit when the voltage of a power grid exceeds the rated input voltage, thereby switching off the switching power supply and improving the reliability of the switching power supply.
Description
Technical field
The utility model relates to power technique fields, relates in particular to a kind of Switching Power Supply.
Background technology
Along with the development of science and technology, Switching Power Supply is applied to all trades and professions, and is also more and more higher to the requirement of Switching Power Supply.The traditional switch power supply when namely the Switching Power Supply input voltage is too high, can seriously cause Switching Power Supply to be damaged in power network fluctuation, affects the reliability of power supply.
The utility model content
Given this, be necessary the Switching Power Supply that provides a kind of reliability high.
A kind of Switching Power Supply comprises input filter rectification circuit, switching circuit, control circuit, transformer translation circuit, output filtering rectification circuit and voltage feedback circuit, also comprises: overvoltage crowbar;
Described input filter rectification circuit, it is connected with described overvoltage crowbar with described transformer translation circuit;
Described switching circuit, it is connected with described control circuit with described transformer translation circuit;
Described output filtering rectification circuit, it is connected with load, also is connected with described control circuit via voltage feedback circuit;
Described overvoltage crowbar, it is connected with described control circuit;
When described Switching Power Supply input overvoltage, described control circuit is controlled the shutoff of described switching circuit under the instruction of overvoltage crowbar.
Further, described switching circuit is MOSFET drive circuit or bipolar transistor driving circuit of insulated gate.
further, described overvoltage crowbar comprises the PNP triode, three end adjustable shunt reference sources, the first resistance, the second resistance, the 3rd resistance and electric capacity, one end of described the first resistance connects described input filter rectification circuit, the other end of described the first resistance connects the reference edge of described three end adjustable shunt reference sources, one end of described the second resistance be connected an end of electric capacity and be connected with the reference edge of described three end adjustable shunt reference sources, ground connection after the anodic bonding of the other end of described the second resistance and the other end of described electric capacity and described three end adjustable shunt reference sources, the negative electrode of described three end adjustable shunt reference sources is connected with the base stage of described PNP triode, one end of described the 3rd resistance is connected with the base stage of described PNP triode, the other end of described the 3rd resistance is connected with the emitter of described PNP triode, the emitter of described PNP triode is connected with described transformer translation circuit, the grounded collector of described PNP triode.
After adopting the utility model scheme, Switching Power Supply is by described overvoltage crowbar, the ratio of the first resistance and the second resistance in suitable adjusting overvoltage crowbar, when line voltage exceeds specified input voltage, described overvoltage crowbar is given described control circuit instruction stopcock circuit, and Switching Power Supply is closed; When line voltage returned to less than specified input voltage, Switching Power Supply was recovered normal operation, had improved the reliability of Switching Power Supply.
Description of drawings
The structured flowchart of the Switching Power Supply that Fig. 1 provides for the utility model one embodiment;
Fig. 2 is the circuit diagram of Fig. 1.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further described.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in and limit this practicality newly.
Consult Fig. 1; the embodiment that the utility model provides; a kind of Switching Power Supply comprises input filter rectification circuit 100, switching circuit 200, control circuit 300, transformer translation circuit 400, output filtering rectification circuit 500, voltage feedback circuit 600 and overvoltage crowbar 700.
Input filter rectification circuit 100, it is connected with overvoltage crowbar with transformer translation circuit 400;
Output filtering rectification circuit 500, it is connected with load, also is connected with control circuit 300 via voltage feedback circuit 600;
When Switching Power Supply input overvoltage, the shutoff of control circuit 300 control switch circuit under the instruction of overvoltage crowbar 700.
Below by a concrete example, embodiment of the present utility model is described in detail, but this example does not consist of restriction of the present utility model.Particularly; be illustrated in figure 2 as the part schematic diagram of Switching Power Supply; a kind of Switching Power Supply comprises input filter rectification circuit 100, switching circuit 200, control circuit 300, transformer translation circuit 400, output filtering rectification circuit 500, voltage feedback circuit 600 and overvoltage crowbar.
overvoltage crowbar comprises the PNP triode, three end adjustable shunt reference source TL431, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3 and capacitor C, one end of the first resistance R 1 connects input filter rectification circuit 100, the other end of the first resistance R 1 connects the reference edge of three end adjustable shunt reference source TL431, one end of the second resistance R 2 is connected an end and is connected with the reference edge of three end adjustable shunt reference source TL431 with capacitor C, ground connection after the anodic bonding of the other end of the second resistance R 2 and the other end of capacitor C and three end adjustable shunt reference source TL431, the negative electrode of three end adjustable shunt reference source TL431 is connected with the base stage of PNP triode, one end of the 3rd resistance R 3 is connected with the base stage of PNP triode, the other end of the 3rd resistance R 3 is connected with the emitter of PNP triode, the emitter of PNP triode is connected with transformer translation circuit 400, the grounded collector of PNP triode.
Overvoltage crowbar is by rationally adjusting the ratio of R1 and R2, set specified input voltage, when input voltage surpasses the specified input voltage of setting, the PNP transistor base is electronegative potential, the conducting of PNP triode drags down the operating voltage of control circuit 300, and control circuit 300 quits work, thus stopcock circuit 200, Switching Power Supply is closed, and quits work; When input voltage was normal, the PNP transistor base was high potential, not conducting of triode.
In a preferred embodiment, switching circuit is MOSFET drive circuit or bipolar transistor driving circuit of insulated gate.
After adopting the utility model scheme, Switching Power Supply is by described overvoltage crowbar, the ratio of the first resistance and the second resistance in suitable adjusting overvoltage crowbar, when line voltage exceeds specified input voltage, described overvoltage crowbar is given described control circuit instruction stopcock circuit, and Switching Power Supply is closed; When line voltage returned to less than specified input voltage, Switching Power Supply was recovered normal operation, had improved the reliability of Switching Power Supply.
The above embodiment has only expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.Should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (3)
1. a Switching Power Supply, comprise input filter rectification circuit, switching circuit, control circuit, transformer translation circuit, output filtering rectification circuit and voltage feedback circuit, it is characterized in that, also comprises: overvoltage crowbar;
Described input filter rectification circuit, it is connected with described overvoltage crowbar with described transformer translation circuit;
Described switching circuit, it is connected with described control circuit with described transformer translation circuit;
Described output filtering rectification circuit, it is connected with load, also is connected with described control circuit via voltage feedback circuit;
Described overvoltage crowbar, it is connected with described control circuit;
When described Switching Power Supply input overvoltage, described control circuit is controlled the shutoff of described switching circuit under the instruction of overvoltage crowbar.
2. Switching Power Supply according to claim 1, is characterized in that, described switching circuit is MOSFET drive circuit or bipolar transistor driving circuit of insulated gate.
3. Switching Power Supply according to claim 1, it is characterized in that, described overvoltage crowbar comprises the PNP triode, three end adjustable shunt reference sources, the first resistance, the second resistance, the 3rd resistance and electric capacity, one end of described the first resistance connects described input filter rectification circuit, the other end of described the first resistance connects the reference edge of described three end adjustable shunt reference sources, one end of described the second resistance be connected an end of electric capacity and be connected with the reference edge of described three end adjustable shunt reference sources, ground connection after the anodic bonding of the other end of described the second resistance and the other end of described electric capacity and described three end adjustable shunt reference sources, the negative electrode of described three end adjustable shunt reference sources is connected with the base stage of described PNP triode, one end of described the 3rd resistance is connected with the base stage of described PNP triode, the other end of described the 3rd resistance is connected with the emitter of described PNP triode, the emitter of described PNP triode is connected with described transformer translation circuit, the grounded collector of described PNP triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220652345 CN202940734U (en) | 2012-11-30 | 2012-11-30 | Switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220652345 CN202940734U (en) | 2012-11-30 | 2012-11-30 | Switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202940734U true CN202940734U (en) | 2013-05-15 |
Family
ID=48324956
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220652345 Expired - Fee Related CN202940734U (en) | 2012-11-30 | 2012-11-30 | Switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202940734U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104811026A (en) * | 2015-05-27 | 2015-07-29 | 成都德麦科技有限公司 | Switch power supply |
| CN106385184A (en) * | 2016-09-30 | 2017-02-08 | 广西大学 | Adjustable switching power supply |
-
2012
- 2012-11-30 CN CN 201220652345 patent/CN202940734U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104811026A (en) * | 2015-05-27 | 2015-07-29 | 成都德麦科技有限公司 | Switch power supply |
| CN106385184A (en) * | 2016-09-30 | 2017-02-08 | 广西大学 | Adjustable switching 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: 20130515 Termination date: 20181130 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |