CN103236782A - Anti-surge soft starting circuit of switching power supply - Google Patents
Anti-surge soft starting circuit of switching power supply Download PDFInfo
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- CN103236782A CN103236782A CN2013101035126A CN201310103512A CN103236782A CN 103236782 A CN103236782 A CN 103236782A CN 2013101035126 A CN2013101035126 A CN 2013101035126A CN 201310103512 A CN201310103512 A CN 201310103512A CN 103236782 A CN103236782 A CN 103236782A
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Abstract
The invention discloses an anti-surge soft starting circuit of a switching power supply. The anti-surge soft starting circuit comprises a bride rectifier, resistors R1 and R2, a relay K1, a 555 clock chip, a transformer, capacitors, a voltage stabilizer, a driver S1 and a power supply AC; an anode of the bridge rectifier is connected with the current limiting resistor R1 and a normally open contact K1.1, the current limiting resistor R1 is connected with a winding of the transformer T1, a cathode of the bridge rectifier is connected with the driver S1 and the capacitor C1, and the driver S1 is connected with the winding of the transformer; the power supply AC is connected with the full-wave bridge rectifier by the transformer, the anode of the full-wave bridge rectifier is connected with the voltage stabilizer, a stabilized voltage supply VCC is obtained after voltage of the power supply AC is stabilized, the stabilized voltage supply VCC is connected with the 555 clock chip by the capacitor C2 and the resistor R2, and the relay K1 and the capacitor C2 are connected onto the circuit in parallel; and the voltage stabilizer is a 7812 voltage stabilizer. The anti-surge soft starting circuit has the advantages that safe and reliable running of the switching power supply can be guaranteed, the accuracy of delay time is improved, and jitter of action of the relay is prevented.
Description
Technical field
The invention belongs to protective circuit of switch power source, be specifically related to the anti-surge soft starting circuit of a kind of Switching Power Supply.
Background technology
Switching Power Supply is the indispensable parts of various electronic equipments, and the quality of its performance is directly connected to the work that can electronic equipment safe and reliable.
The input circuit of Switching Power Supply adopts capacitor filtering type rectification circuit mostly, in switch closure moment, the initial voltage of capacitor is zero, and capacitor charging moment can form very big surge current, high power switching power supply particularly, surge current can reach 100 peaces doubly more than.At power connection moment big electric current like this, may cause fuse blows or switch contact to burn out.So, Switching Power Supply is provided with anti-surge electric current mostly in existing technology, to guarantee the operation of power supply energy normal reliable, for example the patent No. is 201020168049 Chinese utility model patent, a kind of anti-surge soft starting circuit is disclosed, its technical scheme that adopts is: a kind of anti-surge soft starting circuit, comprise rectifier bridge, thyristor V, current-limiting resistance R1, inverter, the main transformer device is assisted winding, capacitor C 1, the positive pole of described rectifier bridge and current-limiting resistance R1, thyristor V is connected, thyristor V is by resistance R 2, inverter links to each other, the negative pole of described rectifier bridge and driver S1, capacitor C 1 links to each other, and described driver S1 links to each other with the auxiliary winding of main transformer device.In power connection moment, input voltage is through rectifier bridge D1～D4 and capacitor C 1 charging of current-limiting resistance R1, limit inrush currents.When capacitor C 1 is charged to about 80% rated voltage, the inverter operate as normal.Triggering signal through the auxiliary winding generation of main transformer device thyristor V makes thyristor V conducting and short circuit current limitation resistance R 1, makes Switching Power Supply be in normal operating condition.But delay time is not set on the circuit, does not reach the purpose of eliminating surge current, and relay still is easy to shake.
Summary of the invention
The technical problem to be solved in the present invention provides the anti-surge soft starting circuit of a kind of Switching Power Supply, can guarantee the operation that power supply can be safe and reliable, improves the accuracy of time of delay and prevents actuating of relay shake.
For solving the problems of the technologies described above, the present invention by the following technical solutions:
A kind of Switching Power Supply is prevented the surge soft starting circuit, comprise rectifier bridge, current-limiting resistance R1, resistance R 2, relay K 1,555 clock chips, transformer, electric capacity, pressurizer, driver S1 and power supply AC, wherein the positive pole of rectifier bridge links to each other with current-limiting resistance R1, normally opened contact K1.1, current-limiting resistance R1 links to each other with transformer T1 winding, the negative pole of rectifier links to each other with driver S1, capacitor C 1, and described driver S1 links to each other with Transformer Winding; Described power supply AC links to each other with full wave bridge rectifier through transformer, the positive pole of full wave bridge rectifier links to each other with pressurizer, described power supply AC obtains stabilized voltage power supply VCC through after the voltage stabilizing, and power supply VCC links to each other with 555 clock chips through capacitor C 2, resistance R 2, relay K 1 and C2 and connect with circuit on.Described pressurizer adopts 7812.
Power connection moment, input voltage is through rectification D1～D4 and the filtering capacitor C1 charging of current-limiting resistance R1, prevent from connecting the surge current of moment, accessory power supply Vcc is connected to the capacitor C2 charging of relay K 1 line bag through 2 pairs of resistance R simultaneously, when the voltage on the C2 reaches the operation voltage of relay K 1, K1 action, its contact K1.1 closure and bypass current-limiting resistance R1, power supply enters normal operating condition.Depend on time constant R2*C2 the time of delay of current limliting, be chosen for 0.3～0.5s usually.For the accuracy that improves time of delay and prevent actuating of relay shake.
Compared with prior art, the advantage that the present invention has is: also be provided with delay circuit on the circuit, can guarantee the operation that power supply can be safe and reliable, improve the accuracy of time of delay and prevent actuating of relay shake.
Description of drawings
Fig. 1 the present invention prevents surge current circuit figure.
Embodiment
Accompanying drawing discloses concrete structure of the present invention without limitation, and the invention will be further described below in conjunction with accompanying drawing.
As shown in Figure 1, a kind of Switching Power Supply is prevented the surge soft starting circuit, comprise rectifier bridge, current-limiting resistance R1, resistance R 2, relay K 1,555 clock chips, transformer, electric capacity, pressurizer, driver S1 and power supply AC, wherein the positive pole of rectifier bridge links to each other with current-limiting resistance R1, normally opened contact K1.1, current-limiting resistance R1 links to each other with transformer T1 winding, the negative pole of rectifier links to each other with driver S1, capacitor C 1, and described driver S1 links to each other with Transformer Winding; Described power supply AC links to each other with full wave bridge rectifier through transformer, the positive pole of full wave bridge rectifier links to each other with pressurizer, described power supply AC obtains stabilized voltage power supply VCC through after the voltage stabilizing, and power supply VCC links to each other with 555 clock chips through capacitor C 2, resistance R 2, relay K 1 and C2 and connect with circuit on.Described pressurizer adopts 7812 pressurizers.
Power connection moment, input voltage is through rectification D1～D4 and the filtering capacitor C1 charging of current-limiting resistance R1, prevent from connecting the surge current of moment, accessory power supply Vcc is connected to the capacitor C2 charging of relay K 1 line bag through 2 pairs of resistance R simultaneously, when the voltage on the C2 reaches the operation voltage of relay K 1, K1 action, its contact K1.1 closure and bypass current-limiting resistance R1, power supply enters normal operating condition.Depend on time constant R2C2 the time of delay of current limliting, be chosen for 0.3～0.5s usually.For the accuracy that improves time of delay and prevent actuating of relay shake.
Claims (2)
1. Switching Power Supply is prevented the surge soft starting circuit, comprise rectifier bridge, current-limiting resistance R1, relay K 1,555 clock chips, transformer T1, capacitor C 1, C2, pressurizer and driver S1, wherein rectifier bridge constitutes by D1～D4 is end to end, the positive pole of rectifier bridge and current-limiting resistance R1, normally opened contact K links to each other, current-limiting resistance R1 links to each other with Transformer Winding, the negative pole of rectifier bridge and driver S1, capacitor C 1 links to each other, driver S1 links to each other with Transformer Winding, it is characterized in that: described AC power AC is after the transformer transformation, through the full wave bridge rectifier rectification, the voltage that obtains passes through the pressurizer voltage stabilizing again, voltage of voltage regulation is through capacitor C 2, resistance R 2 is supplied with 555 clock chips, and described relay K 1 is attempted by on the circuit with capacitor C 2.
2. Switching Power Supply according to claim 1 is prevented the surge soft starting circuit, and it is characterized in that: described pressurizer adopts 7812 pressurizers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101035126A CN103236782A (en) | 2013-03-28 | 2013-03-28 | Anti-surge soft starting circuit of switching power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101035126A CN103236782A (en) | 2013-03-28 | 2013-03-28 | Anti-surge soft starting circuit of switching power supply |
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| CN103236782A true CN103236782A (en) | 2013-08-07 |
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| CN2013101035126A Pending CN103236782A (en) | 2013-03-28 | 2013-03-28 | Anti-surge soft starting circuit of switching power supply |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103792983A (en) * | 2014-01-15 | 2014-05-14 | 中国科学院苏州生物医学工程技术研究所 | Current adjustable and limitable circuit with sudden stop and slow starting functions |
| US11165243B2 (en) | 2019-04-24 | 2021-11-02 | Acer Incorporated | Power supply apparatus |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201577051U (en) * | 2009-11-19 | 2010-09-08 | 中山大洋电机股份有限公司 | Soft start module and motor controller starter using the same |
| CN201656760U (en) * | 2010-03-22 | 2010-11-24 | 临沂施乃通电气技术有限公司 | Surge-prevention soft starting circuit |
| CN201945678U (en) * | 2010-12-23 | 2011-08-24 | 吉林省送变电工程公司 | Detector for arrester discharge counter |
| CN102421231A (en) * | 2011-09-19 | 2012-04-18 | 金陵科技学院 | Energy-saving soft start street lamp control system |
-
2013
- 2013-03-28 CN CN2013101035126A patent/CN103236782A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201577051U (en) * | 2009-11-19 | 2010-09-08 | 中山大洋电机股份有限公司 | Soft start module and motor controller starter using the same |
| CN201656760U (en) * | 2010-03-22 | 2010-11-24 | 临沂施乃通电气技术有限公司 | Surge-prevention soft starting circuit |
| CN201945678U (en) * | 2010-12-23 | 2011-08-24 | 吉林省送变电工程公司 | Detector for arrester discharge counter |
| CN102421231A (en) * | 2011-09-19 | 2012-04-18 | 金陵科技学院 | Energy-saving soft start street lamp control system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103792983A (en) * | 2014-01-15 | 2014-05-14 | 中国科学院苏州生物医学工程技术研究所 | Current adjustable and limitable circuit with sudden stop and slow starting functions |
| US11165243B2 (en) | 2019-04-24 | 2021-11-02 | Acer Incorporated | Power supply apparatus |
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Application publication date: 20130807 |