CN200959514Y - Switch power-supply overvoltage protecting circuit - Google Patents
Switch power-supply overvoltage protecting circuit Download PDFInfo
- Publication number
- CN200959514Y CN200959514Y CN 200620065925 CN200620065925U CN200959514Y CN 200959514 Y CN200959514 Y CN 200959514Y CN 200620065925 CN200620065925 CN 200620065925 CN 200620065925 U CN200620065925 U CN 200620065925U CN 200959514 Y CN200959514 Y CN 200959514Y
- Authority
- CN
- China
- Prior art keywords
- switch power
- circuit
- main circuit
- triode
- switching power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Dc-Dc Converters (AREA)
- Rectifiers (AREA)
Abstract
A switch power over voltage protection circuit is connected in the switch power main circuit in series. The circuit consists of a first polar tube and a triode. The triode base is connected with waves filtering rectifier circuit output end of the switch power main circuit by divider resistor, and connects with the ground by a resistance. The triode collector connects PWM driving signal or feedback end of switch power main circuit, and the triode emitter connects with the ground. The utility model is an improvement for the former switch power main circuit, with little electric components, simple structure, over voltage protection function which is realized by low cost, and convenient usage.
Description
Technical field
The utility model relates to switching power circuit, specifically is a kind of Switching Power Supply overvoltage crowbar.
Background technology
Switching Power Supply is little, in light weight as a kind of volume, high frequency, high efficiency power-converting device, is widely used in every field.Constantly full-fledged along with power technology, the requirement of Switching Power Supply is also more and more higher, and is very extensive such as the application of overvoltage protection, under-voltage protection, overtemperature protection or the like circuit engineering.In existing switching power circuit, have over-voltage protecting function in order to make circuit, the electronic component that is increased is all more, circuit complexity, cost height.
The utility model content
The technical problems to be solved in the utility model provides a kind of simple, electronic component Switching Power Supply overvoltage crowbar few, with low cost.
According to above-mentioned specification requirement, the utility model is realized by the following technical solutions:
A kind of Switching Power Supply overvoltage crowbar; be series in the Switching Power Supply main circuit; this circuit comprises a triode; transistor base links to each other with rectification filter circuit output end in the Switching Power Supply main circuit by divider resistance; and by a grounding through resistance; transistor collector is connected to PWM drive signal or the feedback signal terminal in the Switching Power Supply main circuit, transistor emitter ground connection.
The utility model is that electronic component is few, simple in structure to a kind of improvement in original Switching Power Supply main circuit, realizes over-voltage protecting function with lower cost, and is practical and convenient.
Description of drawings
Accompanying drawing 1 is the utility model embodiment circuit connection diagram.
Embodiment
For the ease of understanding, with specific embodiment structural principle of the present utility model is further described in detail below in conjunction with accompanying drawing:
As shown in Figure 1, this circuit is series in the Switching Power Supply main circuit, the triode Q1 that is adopted is the NPN type, triode Q1 base stage links to each other with rectification filter circuit output end in the Switching Power Supply main circuit by divider resistance R1, R2, and by a resistance R 3 ground connection, the collector electrode of triode Q1 is connected to PWM (pulse width modulation) drive signal or the feedback signal terminal in the Switching Power Supply main circuit, the grounded emitter of triode Q1.
Rectifying and wave-filtering output voltage HV in the Switching Power Supply main circuit, this moment triode Q1 base voltage Vb=HV/ (R1+R2+R3) * R3 because HV is generally higher, so adopted two resistance R 1, R2 dividing potential drop, and value is bigger is more than the general 100K Ω.If the conducting voltage of triode BE PN junction is Vd, then when Vb＜Vd, triode is in cut-off state, Switching Power Supply main circuit operate as normal.When Vb 〉=Vd, triode Q1 is in conducting state, and collector voltage Vc is 0, and then having blocked the PWM drive signal or having made feedback voltage is 0, and whole Switching Power Supply main circuit is not just worked, and has realized over-voltage protecting function.When Vb=Vd, triode Q1 is in critical condition, and the input voltage of Switching Power Supply main circuit at this moment is a critical voltage, when being lower than this voltage, and the circuit operate as normal; When being higher than this voltage, just realize overvoltage protection.
For low power RCC (the RINGING CHOKE CONVERTER) circuit that does not have optocoupler, Vc connects the PWM drive signal; For integrated switch IC, Vc connects feedback signal terminal; For RCC circuit that optocoupler is arranged and PWM control IC driving switch pipe, both select Vc one and get final product.
Claims (1)
1. Switching Power Supply overvoltage crowbar; be series in the Switching Power Supply main circuit; it is characterized in that: this circuit comprises a triode; transistor base links to each other with rectification filter circuit output end in the Switching Power Supply main circuit by divider resistance; and by a grounding through resistance; transistor collector is connected to PWM drive signal or the feedback signal terminal in the Switching Power Supply main circuit, transistor emitter ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620065925 CN200959514Y (en) | 2006-10-13 | 2006-10-13 | Switch power-supply overvoltage protecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620065925 CN200959514Y (en) | 2006-10-13 | 2006-10-13 | Switch power-supply overvoltage protecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200959514Y true CN200959514Y (en) | 2007-10-10 |
Family
ID=38786394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620065925 Expired - Fee Related CN200959514Y (en) | 2006-10-13 | 2006-10-13 | Switch power-supply overvoltage protecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200959514Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101699686B (en) * | 2009-11-19 | 2012-06-06 | 中兴通讯股份有限公司 | Protection device of switch power supply and method thereof |
| CN105576958A (en) * | 2016-02-17 | 2016-05-11 | 兰州空间技术物理研究所 | Pulse width modulation (PWM) error amplifier based output overvoltage and voltage limitation protection circuit of DC-DC converter |
-
2006
- 2006-10-13 CN CN 200620065925 patent/CN200959514Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101699686B (en) * | 2009-11-19 | 2012-06-06 | 中兴通讯股份有限公司 | Protection device of switch power supply and method thereof |
| CN105576958A (en) * | 2016-02-17 | 2016-05-11 | 兰州空间技术物理研究所 | Pulse width modulation (PWM) error amplifier based output overvoltage and voltage limitation protection circuit of DC-DC converter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: HUIZHOU CITY LANWEI ELECTRONIC CO.,LTD Free format text: FORMER OWNER: DESAI ENERGY SCIENCE AND TECHNOLOGY CO., LTD., HUIZHOU Effective date: 20080711 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20080711 Address after: Zip code No. 16 District, Huizhou Province, Guangdong City Zhongkai hi tech Industrial Development Zone: 516006 Patentee after: Huizhou Lanwer Electronic Co., Ltd. Address before: No. 2 Gu Tong Industrial Zone, Guangdong City, Huizhou Province, China: 516008 Patentee before: Desai Energy Science and Technology Co., Ltd., Huizhou |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071010 Termination date: 20091113 |