CN202888816U - Slow startup circuit for large capacitive load - Google Patents
Slow startup circuit for large capacitive load Download PDFInfo
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- CN202888816U CN202888816U CN 201220520612 CN201220520612U CN202888816U CN 202888816 U CN202888816 U CN 202888816U CN 201220520612 CN201220520612 CN 201220520612 CN 201220520612 U CN201220520612 U CN 201220520612U CN 202888816 U CN202888816 U CN 202888816U
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- capacitive load
- large capacitive
- relay
- current
- soft
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Abstract
The present utility model provides a slow startup circuit for a large capacitive load. The slow startup circuit comprises a current-limiting resistor, a relay and a large capacitive load, the current-limiting resistor is connected with the large capacitive load in series, and the relay is connected with the current-limiting resistor in parallel. By adopting the slow startup circuit for the large capacitive load, influences of capacitive load impact current are solved, costs are controlled, and temperature adaptive capability of a system can be enhanced.
Description
Technical field
The utility model relates to the soft-start circuit for large capacitive load, is specifically related to a kind of circuit of eliminating large capacitive load moment impact electric current.
Background technology
Generally the load of load capacitor parameter, the load that namely meets the voltage delay current characteristics is called capacitive load.Capacitive load powers in a flash, is equivalent to short circuit, and electric current moment is infinitely-great in theory.This theoretical infinitely-great electric current is called impulse current.At present often adopt soft initiator or negative tempperature coefficient thermistor for the impact that solves impulse current, the former cost is higher, and the latter is influenced by ambient temperature serious.
The utility model content
In order to solve existing technical problem in the background technology, the utility model proposes the soft-start circuit that is applicable to large capacitive load, solved the impact of capacitive load impulse current, and controlled cost, improve the temperature adaptive capacity of system.
The technical solution of the utility model is: the soft-start circuit that is applicable to large capacitive load, its special character is: described soft-start circuit comprises current-limiting resistance, relay and large capacitive load, described current-limiting resistance is connected with large capacitive load, and described relay is in parallel with current-limiting resistance.
Above-mentioned soft-start circuit also comprises sample circuit, and described sample circuit is connected with large capacitive load with relay respectively.
Above-mentioned relay comprises relay coil end and relay switch end, and described relay is connected with sample circuit by the relay coil end; Described relay is in parallel with current-limiting resistance by the relay switch end.
Above-mentioned relay coil end is by control voltage U c control.
Above-mentioned sample circuit is DC linear voltage-stabilizing.
Above-mentioned control voltage U c is that the large capacitive load both end voltage produces by the sample circuit sampling.
The utility model has the advantages that:
1) the utility model adopts current-limiting resistance to connect with large capacitive load, the technical scheme that relay is in parallel with current-limiting resistance, the impulse current that very effective elimination large capacitive load produces;
2) use the relay short-circuit resistance, guarantee the circuit normal operation behind the elimination impulse current;
3) circuit cost of the present utility model is cheap, and is simple and reliable, and thermal adaptability is strong, successful.
Description of drawings
Fig. 1 is the utility model circuit diagram.
Specific implementation method
Referring to Fig. 1, the utility model is the soft-start circuit that is applicable to large capacitive load, and circuit comprises large capacitive load 1, relay 2, high-power current-limiting resistance 3, sample circuit 4 and control voltage U c; High-power current-limiting resistance 3 is connected with large capacitive load 1, and relay 2 is in parallel with high-power current-limiting resistance 3; Sample circuit 4 is connected with large capacitive load with relay 2 respectively and is connected; Relay 2 comprises relay coil end and relay switch end, and relay 2 is connected with sample circuit 4 by the relay coil end; Relay 2 is in parallel with high-power current-limiting resistance 3 by the relay switch end; The relay coil end is by control voltage U c control; Control voltage U c is that large capacitive load 1 both end voltage produces by sample circuit 4 samplings.Sample circuit 4 is DC linear voltage-stabilizings.
The principle of soft-start circuit of the present utility model is: at powered on moment, capacitive load is equivalent to short circuit, and high-power current-limiting resistance 3 produces a suitable electric current, thereby has eliminated infinitely-great impulse current of moment.Capacitor charging is after a period of time, and the pick-up voltage that the control voltage U c by sample circuit 4 samplings reaches relay 2 makes relay 2 adhesives, thereby high-power current-limiting resistance is fallen in short circuit, makes circuit recover normal operation.
Claims (6)
1. be applicable to the soft-start circuit of large capacitive load, it is characterized in that: described soft-start circuit comprises current-limiting resistance, relay and large capacitive load, and described current-limiting resistance is connected with large capacitive load, and described relay is in parallel with current-limiting resistance.
2. the soft-start circuit that is applicable to large capacitive load according to claim 1, it is characterized in that: described soft-start circuit also comprises sample circuit, described sample circuit is connected with large capacitive load with relay respectively.
3. the soft-start circuit that is applicable to large capacitive load according to claim 2, it is characterized in that: described relay comprises relay coil end and relay switch end, and described relay is connected with sample circuit by the relay coil end; Described relay is in parallel with current-limiting resistance by the relay switch end.
4. the soft-start circuit that is applicable to large capacitive load according to claim 3 is characterized in that: described relay coil end is by control voltage U c control.
5. the soft-start circuit that is applicable to large capacitive load according to claim 4, it is characterized in that: described sample circuit is DC linear voltage-stabilizing.
6. the soft-start circuit that is applicable to large capacitive load according to claim 5 is characterized in that: described control voltage U c is that the large capacitive load both end voltage produces by the sample circuit sampling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220520612 CN202888816U (en) | 2012-10-11 | 2012-10-11 | Slow startup circuit for large capacitive load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220520612 CN202888816U (en) | 2012-10-11 | 2012-10-11 | Slow startup circuit for large capacitive load |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202888816U true CN202888816U (en) | 2013-04-17 |
Family
ID=48080206
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220520612 Expired - Lifetime CN202888816U (en) | 2012-10-11 | 2012-10-11 | Slow startup circuit for large capacitive load |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202888816U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103802763A (en) * | 2014-02-20 | 2014-05-21 | 中国北方车辆研究所 | Direct-current high-voltage large current combination power distribution protection device of armored vehicle |
| CN108879594A (en) * | 2018-08-14 | 2018-11-23 | 郑州云海信息技术有限公司 | A kind of overcurrent protection circuit of server and its POL |
| CN108964437A (en) * | 2018-06-07 | 2018-12-07 | 广州市普今电子科技有限公司 | A kind of circuit promoting starting capacitance load capability |
-
2012
- 2012-10-11 CN CN 201220520612 patent/CN202888816U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103802763A (en) * | 2014-02-20 | 2014-05-21 | 中国北方车辆研究所 | Direct-current high-voltage large current combination power distribution protection device of armored vehicle |
| CN103802763B (en) * | 2014-02-20 | 2015-12-30 | 中国北方车辆研究所 | A kind of armored vehicle high direct voltage big current combination power distribution protective device |
| CN108964437A (en) * | 2018-06-07 | 2018-12-07 | 广州市普今电子科技有限公司 | A kind of circuit promoting starting capacitance load capability |
| CN108879594A (en) * | 2018-08-14 | 2018-11-23 | 郑州云海信息技术有限公司 | A kind of overcurrent protection circuit of server and its POL |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130417 |
|
| CX01 | Expiry of patent term |