CN204633617U - The surge-prevention soft starting circuit of Switching Power Supply - Google Patents
The surge-prevention soft starting circuit of Switching Power Supply Download PDFInfo
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- CN204633617U CN204633617U CN201520390652.0U CN201520390652U CN204633617U CN 204633617 U CN204633617 U CN 204633617U CN 201520390652 U CN201520390652 U CN 201520390652U CN 204633617 U CN204633617 U CN 204633617U
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- resistance
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- electric capacity
- rectifier bridge
- power supply
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Abstract
The utility model relate to a kind of surge-prevention soft starting circuit of Switching Power Supply, comprise rectifier bridge, one-way SCR, triode, first resistance, second resistance, first electric capacity, second electric capacity, ancillary coil, primary coil, circuits for triggering, two power inputs of described rectifier bridge connect the two poles of the earth of AC power respectively, described first resistance is in parallel with the positive pole of rectifier bridge and negative pole with after the first capacitances in series, described one-way SCR is attempted by the two ends of the first resistance, the control pole of described one-way SCR connects one end of the second resistance, the other end of the second resistance accesses the negative pole of one-way SCR by ancillary coil, the negative pole of described one-way SCR passes through the collector electrode of primary coil connecting triode.The beneficial effects of the utility model are: Circuit responce speed is fast, and reliability is high, can limit inrush currents effectively, ensure the normal and reliability service of power supply.
Description
Technical field
The utility model relates to mains switch technical field, specifically a kind of surge-prevention soft starting circuit of Switching Power Supply.
Background technology
The quality index of Switching Power Supply should be the first principle with fail safe, reliability.Meet the condition of normal instructions for use in electrical technology index under, for making power supply work safely and reliably under adverse circumstances and catastrophic failure situation, protection circuit.The input circuit of Switching Power Supply mostly adopts capacitor filtering type rectification circuit, close a floodgate moment at incoming power, because the initial voltage on capacitor is zero, capacitor charging transient can form very large surge current, particularly high power switching power supply, the filtering capacitor that employing capacity is larger, makes surge current reach more than 100A.Surge current so large is instantaneously connected at power supply; severe one often causes inputting fuse and blows or the burning of contact of closing switch; rectifier bridge overcurrent damage; the lighter also can make air switch close not brake application; above-mentioned phenomenon all can cause Switching Power Supply normally to work, and protects so be badly in need of a kind of safe and reliable surge-prevention soft starting circuit Switching Power Supply.
Utility model content
Not enough for above-mentioned prior art, the utility model provides the surge-prevention soft starting circuit of the Switching Power Supply that a kind of overcurrent action response speed is fast, reliability is high, protected effect is good.
The surge-prevention soft starting circuit of the Switching Power Supply that the utility model provides is achieved through the following technical solutions:
A kind of surge-prevention soft starting circuit of Switching Power Supply, it is characterized in that: comprise rectifier bridge Q, unidirectional controllable silicon S CR, triode VT, first resistance R1, second resistance R2, first electric capacity C1, second electric capacity C2, ancillary coil L1, primary coil L2, circuits for triggering, two power inputs of described rectifier bridge Q connect the two poles of the earth of AC power respectively, it is in parallel with the positive pole of rectifier bridge Q and negative pole after described first resistance R1 connects with the first electric capacity C1, described unidirectional controllable silicon S CR is attempted by the two ends of the first resistance R1, the control pole of described unidirectional controllable silicon S CR connects one end of the second resistance R2, the other end of the second resistance R2 accesses the negative pole of unidirectional controllable silicon S CR by ancillary coil L1, the negative pole of described unidirectional controllable silicon S CR passes through the collector electrode of primary coil L2 connecting triode VT, the terminals of the base stage connecting valve power drives of described triode VT, emitter another terminals of connecting valve power drives and the negative pole of rectifier bridge Q respectively of described triode VT.
Described circuits for triggering are made up of the first diode D1, the second diode D2, secondary coil L3, induction coil L4, the second electric capacity C2, after described first diode D1, induction coil L4, the second electric capacity C2 are in sequential series and secondary coil L3 connecing, described second diode D2 is attempted by induction coil L4 and the second electric capacity C2 two ends.
The beneficial effects of the utility model are: Circuit responce speed is fast, and reliability is high, can limit inrush currents effectively, ensure the normal and reliability service of power supply.
Accompanying drawing explanation
Fig. 1 is electrical block diagram of the present utility model.
Embodiment
For making the object of the application, technical scheme and advantage clearly, below in conjunction with drawings and the specific embodiments, the application is described in further detail.
A kind of surge-prevention soft starting circuit of Switching Power Supply as shown in Figure 1, it is characterized in that: comprise rectifier bridge Q, unidirectional controllable silicon S CR, triode VT, first resistance R1, second resistance R2, first electric capacity C1, second electric capacity C2, ancillary coil L1, primary coil L2, circuits for triggering, two power inputs of described rectifier bridge Q connect the two poles of the earth of AC power respectively, it is in parallel with the positive pole of rectifier bridge Q and negative pole after described first resistance R1 connects with the first electric capacity C1, described unidirectional controllable silicon S CR is attempted by the two ends of the first resistance R1, the control pole of described unidirectional controllable silicon S CR connects one end of the second resistance R2, the other end of the second resistance R2 accesses the negative pole of unidirectional controllable silicon S CR by ancillary coil L1, the negative pole of described unidirectional controllable silicon S CR passes through the collector electrode of primary coil L2 connecting triode VT, the terminals of the base stage connecting valve power drives of described triode VT, emitter another terminals of connecting valve power drives and the negative pole of rectifier bridge Q respectively of described triode VT.
Further, described circuits for triggering are made up of the first diode D1, the second diode D2, secondary coil L3, induction coil L4, the second electric capacity C2, after described first diode D1, induction coil L4, the second electric capacity C2 are in sequential series and secondary coil L3 connecing, described second diode D2 is attempted by induction coil L4 and the second electric capacity C2 two ends.
The Anti-surging current circuit that the utility model adopts unidirectional controllable silicon S CR and the first resistance R1 to form, connect moment at power supply, input voltage charges to the first electric capacity C1 through rectifier bridge Q and the first resistance R1, limit inrush currents; When the first electric capacity C1 is charged to the certain proportion of rated voltage constantly, circuits for triggering start, produce the triggering signal of unidirectional controllable silicon S CR through ancillary coil L1, make unidirectional controllable silicon S CR conducting and make the first resistance R1 short circuit, after this Switching Power Supply drives and is in normal operating condition.
The above embodiment only represents execution mode of the present utility model, and it describes comparatively concrete and detailed, but can not be interpreted as the restriction to the utility model scope.It 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 the utility model protection range.
Claims (2)
1. the surge-prevention soft starting circuit of a Switching Power Supply, it is characterized in that: comprise rectifier bridge, one-way SCR, triode, first resistance, second resistance, first electric capacity, second electric capacity, ancillary coil, primary coil, circuits for triggering, two power inputs of described rectifier bridge connect the two poles of the earth of AC power respectively, described first resistance is in parallel with the positive pole of rectifier bridge and negative pole with after the first capacitances in series, described one-way SCR is attempted by the two ends of the first resistance, the control pole of described one-way SCR connects one end of the second resistance, the other end of the second resistance accesses the negative pole of one-way SCR by ancillary coil, the negative pole of described one-way SCR passes through the collector electrode of primary coil connecting triode, the terminals of the base stage connecting valve power drives of described triode, emitter another terminals of connecting valve power drives and the negative pole of rectifier bridge respectively of described triode.
2. the surge-prevention soft starting circuit of a kind of Switching Power Supply according to claim 1, it is characterized in that, described circuits for triggering are made up of the first diode, the second diode, secondary coil, induction coil, the second electric capacity, after described first diode, induction coil, the second electric capacity are in sequential series and secondary coil connecing, described second diode is attempted by induction coil and the second electric capacity two ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520390652.0U CN204633617U (en) | 2015-06-09 | 2015-06-09 | The surge-prevention soft starting circuit of Switching Power Supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520390652.0U CN204633617U (en) | 2015-06-09 | 2015-06-09 | The surge-prevention soft starting circuit of Switching Power Supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204633617U true CN204633617U (en) | 2015-09-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520390652.0U Expired - Fee Related CN204633617U (en) | 2015-06-09 | 2015-06-09 | The surge-prevention soft starting circuit of Switching Power Supply |
Country Status (1)
| Country | Link |
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| CN (1) | CN204633617U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602532A (en) * | 2017-02-15 | 2017-04-26 | 京东方科技集团股份有限公司 | Current limiting circuit, driving method thereof, PMIC protection system and display device protection system |
| CN105915064B (en) * | 2016-05-31 | 2019-02-05 | 广州金升阳科技有限公司 | A kind of auxiliary power circuit |
-
2015
- 2015-06-09 CN CN201520390652.0U patent/CN204633617U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105915064B (en) * | 2016-05-31 | 2019-02-05 | 广州金升阳科技有限公司 | A kind of auxiliary power circuit |
| CN106602532A (en) * | 2017-02-15 | 2017-04-26 | 京东方科技集团股份有限公司 | Current limiting circuit, driving method thereof, PMIC protection system and display device protection system |
| CN106602532B (en) * | 2017-02-15 | 2019-04-26 | 京东方科技集团股份有限公司 | Current-limiting circuit and its driving method, PMIC protection system and display apparatus protecting system |
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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: 20150909 Termination date: 20170609 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |