CN202260437U - Low-power surge eliminating circuit and switching power supply - Google Patents
Low-power surge eliminating circuit and switching power supply Download PDFInfo
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- CN202260437U CN202260437U CN2011203894031U CN201120389403U CN202260437U CN 202260437 U CN202260437 U CN 202260437U CN 2011203894031 U CN2011203894031 U CN 2011203894031U CN 201120389403 U CN201120389403 U CN 201120389403U CN 202260437 U CN202260437 U CN 202260437U
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Abstract
The utility model discloses a low-power surge eliminating circuit and a switching power supply. The low-power surge eliminating circuit comprises a silicon-controlled circuit, a surge suppression circuit and a delay circuit; the surge suppression circuit comprises a first voltage dividing circuit and a secondary voltage dividing circuit, wherein the first voltage dividing circuit, the secondary voltage dividing circuit, the delay circuit and the silicon-controlled circuit are mutually connected in parallel; and the delay circuit controls the switching-on of the silicon-controlled circuit when surge current is generated, and switches on the silicon-controlled circuit when the first voltage dividing circuit controls and switches on the secondary voltage dividing circuit. Through the circuit composed of simple components, the utility model solves the problem of surge protection in a power supply; and the surge suppression circuit is low in dissipation and is particularly suitable for high-power power supplies.
Description
Technical field
The utility model relates to power technique fields, relates in particular to circuit and Switching Power Supply that surge is eliminated in a kind of low-power consumption.
Background technology
Surge mainly refers to the strong pulse that power connection moment produces, and this strong pulse will form surge current inflow power-supply device, and the circuit of power-supply device is caused great influence.
Therefore, in order to eliminate the surge of power connection moment generation, people utilize non-linear element to absorb surge current, for example through shunt capacitance or series inductance.As shown in Figure 1, eliminate surge through load end series thermal-sensitive resistance R 1 at transformer TX1.
Foregoing circuit only can be directed against small-power power, then needs a plurality of thermistor parallel connections for large power supply.Temperature rise was in the safety scope when for example the power supply of 300W approximately needed 3 thermistor R1 to keep work, and then its parallel resistor value is 1/3R1.Along with the increase of power, this parallelly connected thermistor will lose the effect of its surge protection.
The utility model content
The main purpose of the utility model is that to solve in the prior art in the large power supply the anti-surge effect of thermistor low and provide a kind of low-power consumption to eliminate the circuit of surge, is intended to make that this circuit structure is simple, and eliminates surge effectively.
The utility model provides a kind of low-power consumption to eliminate the circuit of surge, comprises ghyristor circuit, surge restraint circuit and delay circuit; Said surge restraint circuit comprises first bleeder circuit and second bleeder circuit; Wherein, Said first bleeder circuit, second bleeder circuit, delay circuit and ghyristor circuit are connected in parallel each other; Said delay circuit is controlled the closure of said ghyristor circuit when surge current produces, the said ghyristor circuit of conducting after said first bleeder circuit is controlled the said second bleeder circuit conducting.
Preferably, said ghyristor circuit comprises silicon controlled rectifier, and the anode of said silicon controlled rectifier is connected with the rectification circuit of transformer, and negative electrode is connected with load circuit, and gate pole is connected with delay circuit.
Preferably, said first bleeder circuit comprises first resistance, and said first resistance is parallelly connected with silicon controlled rectifier.
Preferably, said delay circuit comprises the electric capacity of the 3rd resistance and series connection with it, and the node that is connected with the 3rd resistance of said electric capacity is connected with the gate pole of said silicon controlled rectifier respectively.
Preferably, said second bleeder circuit comprises voltage-stabiliser tube, second resistance and triode, an end of said voltage-stabiliser tube and being connected of first resistance, and the other end is connected with the base stage of triode through second resistance; The collector electrode of said triode is connected with an end of said electric capacity, and emitter is connected with the other end of said electric capacity.
Preferably, the impedance of impedance ratio first resistance of said silicon controlled rectifier is little.
The utility model also provides a kind of Switching Power Supply, comprise transformer, load circuit and be connected transformer and load circuit between the circuit of elimination surge, the circuit of said elimination surge comprises ghyristor circuit, surge restraint circuit and delay circuit; Said surge restraint circuit comprises first bleeder circuit and second bleeder circuit; Wherein, Said first bleeder circuit, second bleeder circuit, delay circuit and ghyristor circuit are connected in parallel each other; Said delay circuit is controlled the closure of said ghyristor circuit when surge current produces, the said ghyristor circuit of conducting after said first bleeder circuit is controlled the said second bleeder circuit conducting.
Preferably, said ghyristor circuit comprises silicon controlled rectifier, and the anode of said silicon controlled rectifier is connected with the rectification circuit of transformer, and negative electrode is connected with load circuit, and gate pole is connected with delay circuit.
Preferably, said first bleeder circuit comprises first resistance, and said first resistance is parallelly connected with silicon controlled rectifier.
Preferably, said delay circuit comprises the 3rd resistance and the electric capacity of connecting with the 3rd resistance, and an end that is connected with the 3rd resistance of said electric capacity is connected with the gate pole of triode and silicon controlled rectifier respectively.
Preferably, said second bleeder circuit comprises voltage-stabiliser tube, second resistance and triode, an end of said voltage-stabiliser tube and being connected of first resistance, and the other end is connected with the base stage of triode through second resistance; The two ends of said triode connect delay circuit and load circuit respectively.
Preferably, the impedance of impedance ratio first resistance of said silicon controlled rectifier is little.
The circuit that the utility model is formed through simple elements solved the problem of surge protection in the power supply, and the loss of this surge restraint circuit is little, is particularly useful for large power supply.
Description of drawings
Fig. 1 is a structural representation of eliminating the circuit of surge circuit in the prior art;
Fig. 2 is the structural representation that the circuit preferred embodiment of surge is eliminated in the utility model low-power consumption.
The realization of the utility model purpose, functional characteristics and advantage will combine embodiment, further specify with reference to accompanying drawing.
Embodiment
Further specify the technical scheme of the utility model below in conjunction with Figure of description and specific embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Fig. 2 is the electrical block diagram that surge is eliminated in the utility model low-power consumption.
With reference to Fig. 2, the circuit that surge is eliminated in the utility model low-power consumption comprises ghyristor circuit 10, surge restraint circuit 20 and delay circuit 30.Ghyristor circuit 10 is used for quick conducting or cuts off load circuit 2; Comprise silicon controlled rectifier SCR1; The anode of this silicon controlled rectifier SCR1 is connected with the rectification circuit 4 of transformer 3, and negative electrode is connected with load circuit 2, and gate pole is connected with delay circuit 30; Through delay circuit 30, can control silicon controlled rectifier SCR1 conducting or end.Surge restraint circuit 20 comprises first bleeder circuit 21 and second bleeder circuit 22.This first bleeder circuit 21 comprises first resistance R 1; Second bleeder circuit 22 comprises second resistance R 2, voltage-stabiliser tube D1 and triode Q1.Delay circuit 30 comprises the 3rd resistance R 3 and the capacitor C of connecting with the 3rd resistance R 3, and the node that capacitor C is connected with the 3rd resistance R 3 is connected with said silicon controlled gate pole.First resistance R 1 is parallelly connected with silicon controlled rectifier SCR1.The negative pole of voltage-stabiliser tube D1 is connected with the rectification circuit 4 of transformer 3, and positive pole is connected with an end of second resistance R 2, and the other end of second resistance R 2 is connected with the base stage of triode Q1.One end of the 3rd resistance R 3 is connected with the rectification circuit 4 of transformer 3, and the other end is connected with the collector electrode of capacitor C and triode Q1 respectively, and the emitter of triode Q1 is connected with load circuit 2.
The course of work of the circuit of this low-power consumption elimination surge is following:
When surge produced, transformer 3 produced surge current after through rectification circuit 4 rectifications.Silicon controlled rectifier SCR1 is in cut-off state owing to the resistance of the 3rd resistance R 3 makes the voltage at capacitor C 1 two ends can't reach the threshold voltage of silicon controlled rectifier SCR1 very greatly, so this surge current first resistance R 1 to load circuit 2 of all flowing through.
When the voltage at first resistance R, 1 two ends increases and when voltage-stabiliser tube D1 is punctured; Surge current separated into two parts a: part first resistance R 1 to the load circuit 2 of flowing through; Another part voltage-stabiliser tube D1 and second resistance R 2 to base stage of triode Q1 of flowing through, thus triode Q1 conducting made.
When triode Q1 conducting; Surge current is divided into three parts: first's first resistance R 1 to load circuit 2 of flowing through; Second portion voltage-stabiliser tube D1 and second resistance R 2 to the base stage of triode Q1 of flowing through, third part are flowed through the 3rd resistance R 3 and triode Q1 to load circuit 2.
Therefore, when surge produces, can be successively eliminate surge current through first resistance R 1, second resistance R 2 and the 3rd resistance R 3 in the surge restraint circuit.
Above-mentioned delay circuit 30 is controlled the closure of said ghyristor circuit 10 when surge current produces, the said ghyristor circuit 10 of conducting after 22 conductings of said second bleeder circuit of said first bleeder circuit, 21 controls.Particularly, when surge produced, the voltage at capacitor C 1 two ends can't reach the gate voltage of silicon controlled rectifier SCR1, so silicon controlled rectifier SCR1 is an off-state.Treat that first resistance R, 1 voltage increases, thereby control the voltage-stabiliser tube D1 conducting of second bleeder circuit 22, and then turn-on transistor Q1.Because the two ends of capacitor C 1 are connected with collector electrode with the emitter of triode Q1 respectively; So when surge current is flowed through triode Q1; The voltage at capacitor C 1 two ends also progressively increases, thereby reaches the gate voltage of silicon controlled rectifier SCR1, makes silicon controlled rectifier SCR1 conducting.And the electric current of the rectification circuit 4 of transformer 3 is flowed through silicon controlled rectifier SCR1 to load circuit 2.Because the impedance of impedance ratio first resistance R 1 of silicon controlled rectifier SCR1 is much little, therefore after silicon controlled rectifier SCR1 conducting, first resistance R 1 is in the state of short circuit, thereby can solve the problem that the thermistor loss is big in the prior art, heating is big.
The circuit that the utility model is formed through simple elements solved the problem of surge protection in the power supply, and the loss of this surge restraint circuit is little, is particularly useful for large power supply.
The utility model has also proposed a kind of Switching Power Supply, and this Switching Power Supply comprises transformer 3, load circuit 2 and eliminate the circuit of surge that the circuit of said elimination surge is connected between the rectification circuit 4 and load circuit 2 of transformer 3, and is as shown in Figure 2.Its structure is consistent with the structure of the circuit of the low-power consumption elimination surge of the foregoing description, just repeats no more at this.
This Switching Power Supply is not only eliminated surge through the simple elements combination effectively through the circuit of the elimination surge of said structure, and makes its loss of eliminating surge reduce, and is particularly useful for large power supply.
The above is merely the preferred embodiment of the utility model; Be not so limit its claim; Every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to be done; Directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the utility model.
Claims (7)
1. the circuit of a low-power consumption elimination surge is characterized in that, comprises ghyristor circuit, surge restraint circuit and delay circuit; Said surge restraint circuit comprises first bleeder circuit and second bleeder circuit; Wherein, Said first bleeder circuit, second bleeder circuit, delay circuit and ghyristor circuit are connected in parallel each other; Said delay circuit is controlled the closure of said ghyristor circuit when surge current produces, the said ghyristor circuit of conducting after said first bleeder circuit is controlled the said second bleeder circuit conducting.
2. the circuit of surge is eliminated in low-power consumption according to claim 1; It is characterized in that said ghyristor circuit comprises silicon controlled rectifier, the anode of said silicon controlled rectifier is connected with the rectification circuit of transformer; Negative electrode is connected with load circuit, and gate pole is connected with delay circuit.
3. the circuit of surge is eliminated in low-power consumption according to claim 2, it is characterized in that said first bleeder circuit comprises first resistance, and said first resistance is parallelly connected with silicon controlled rectifier.
4. the circuit of surge is eliminated in low-power consumption according to claim 3, it is characterized in that, said delay circuit comprises that the 3rd resistance reaches and the electric capacity of series connection with it, and the node that is connected with the 3rd resistance of said electric capacity is connected with the gate pole of said silicon controlled rectifier.
5. the circuit of surge is eliminated in low-power consumption according to claim 4; It is characterized in that; Said second bleeder circuit comprises voltage-stabiliser tube, second resistance and triode, an end of said voltage-stabiliser tube and being connected of first resistance, and the other end is connected with the base stage of triode through second resistance; The collector electrode of said triode is connected with an end of said electric capacity, and emitter is connected with the other end of said electric capacity.
6. the circuit of surge is eliminated in low-power consumption according to claim 5, it is characterized in that the impedance of impedance ratio first resistance of said silicon controlled rectifier is little.
7. a Switching Power Supply comprises transformer, load circuit, it is characterized in that, comprises that also the circuit of said elimination surge is connected between transformer and the load circuit like the circuit of any described elimination surge in the claim 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203894031U CN202260437U (en) | 2011-10-13 | 2011-10-13 | Low-power surge eliminating circuit and switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203894031U CN202260437U (en) | 2011-10-13 | 2011-10-13 | Low-power surge eliminating circuit and switching power supply |
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| Publication Number | Publication Date |
|---|---|
| CN202260437U true CN202260437U (en) | 2012-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011203894031U Expired - Fee Related CN202260437U (en) | 2011-10-13 | 2011-10-13 | Low-power surge eliminating circuit and switching power supply |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746358A (en) * | 2013-12-27 | 2014-04-23 | 深圳市九洲电器有限公司 | Surge suppression circuit, switching device and set-top box |
| CN106300307A (en) * | 2016-08-30 | 2017-01-04 | 苏州佳世达光电有限公司 | A kind of anti-surge circuit and the Switching Power Supply of Anti-surging |
| CN107370354A (en) * | 2017-06-26 | 2017-11-21 | 北京机械设备研究所 | A kind of AC input current Surge suppression system |
| CN111555599A (en) * | 2020-04-29 | 2020-08-18 | 中国电子科技集团公司第二十九研究所 | Power-on surge current suppression circuit and method of capacitor |
| CN111555598A (en) * | 2020-04-29 | 2020-08-18 | 中国电子科技集团公司第二十九研究所 | Intelligent capacitor and working method thereof |
| CN111697806A (en) * | 2020-06-05 | 2020-09-22 | 广东浪潮大数据研究有限公司 | Power supply impact current suppression circuit |
-
2011
- 2011-10-13 CN CN2011203894031U patent/CN202260437U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746358A (en) * | 2013-12-27 | 2014-04-23 | 深圳市九洲电器有限公司 | Surge suppression circuit, switching device and set-top box |
| CN103746358B (en) * | 2013-12-27 | 2017-04-12 | 深圳市九洲电器有限公司 | Surge suppression circuit, switching device and set-top box |
| CN106300307A (en) * | 2016-08-30 | 2017-01-04 | 苏州佳世达光电有限公司 | A kind of anti-surge circuit and the Switching Power Supply of Anti-surging |
| CN107370354A (en) * | 2017-06-26 | 2017-11-21 | 北京机械设备研究所 | A kind of AC input current Surge suppression system |
| CN111555599A (en) * | 2020-04-29 | 2020-08-18 | 中国电子科技集团公司第二十九研究所 | Power-on surge current suppression circuit and method of capacitor |
| CN111555598A (en) * | 2020-04-29 | 2020-08-18 | 中国电子科技集团公司第二十九研究所 | Intelligent capacitor and working method thereof |
| CN111697806A (en) * | 2020-06-05 | 2020-09-22 | 广东浪潮大数据研究有限公司 | Power supply impact current suppression circuit |
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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: 20120530 Termination date: 20201013 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |