CN210093108U - Circuit for reducing impulse current of switching power supply - Google Patents
Circuit for reducing impulse current of switching power supply Download PDFInfo
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- CN210093108U CN210093108U CN201920723660.0U CN201920723660U CN210093108U CN 210093108 U CN210093108 U CN 210093108U CN 201920723660 U CN201920723660 U CN 201920723660U CN 210093108 U CN210093108 U CN 210093108U
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Abstract
The utility model belongs to the direct current power supply that the track traffic trade used is applicable to the switching power supply module of railway direct current power supply, especially about a circuit that reduces switching power supply impulse current, characterized by: at least comprises a switch power supply circuit (1), an anti-impact resistor is connected in series at the input end of the switch power supply circuit (1), a normally-open switch of a relay switch is connected at the two ends of the anti-impact resistor, and the output end voltage (3) of the switch power supply circuit (1) is at least electrically connected with the power end of the relay to supply the working voltage of the relay. The circuit for reducing the impact current of the switching power supply ensures the starting stability of the switching power supply, reduces the impact of capacitor charging and discharging on the power supply and prolongs the service life of the power supply.
Description
Technical Field
The utility model belongs to the direct current power supply that the track traffic trade used is applicable to the switching power supply module of railway direct current power supply, especially about a circuit that reduces switching power supply impulse current.
Background
The switching power supply has the advantages of high efficiency, small volume, light weight, high reliability and the like, so the switching power supply is widely applied to a railway direct-current power supply system. The switching power supply circuit mainly comprises an input circuit, a conversion circuit, a control circuit and an output circuit, wherein the input end of a direct current switching power supply generally adopts a filter to carry out alternating current input filtering, a large amount of capacitors exist in the power supply, and larger impact current can be generated by charging and discharging at the moment of starting, so that the starting is unstable or electronic devices in the power supply are damaged. Therefore, the design can reduce the impulse current circuit of the switching power supply, improve the integrity and reliability of the power supply and meet the requirements of safety and reliability of railway power supply products.
Disclosure of Invention
The utility model provides a reduce switching power supply impulse current's circuit guarantees the stability of switching power supply start, has reduced the electric capacity and has charged and discharge the impact to the power, has increased the life of power.
The utility model aims at realizing like this, provide a reduce switching power supply start impulse current's circuit, characterized by: the power supply device at least comprises a switch power supply circuit, wherein an input end of the switch power supply circuit is connected with an anti-impact resistor in series, two ends of the anti-impact resistor are connected with a normally-open end switch of a relay switch, and output end voltage of the switch power supply circuit is at least electrically connected with a power end of the relay to supply working voltage for the relay.
And the voltage of the output end of the switching power supply circuit is electrically connected with the power supply end of the relay to form a delay circuit.
The delay circuit is a timing circuit.
The anti-impact resistor is a cement resistor.
The cement resistors are connected in parallel.
The delay time of the delay circuit is 10-100 ms.
The cement resistor is 20W and 30 omega.
The anti-impact resistor adopts a cement resistor as a load when the power supply is started, the cement resistor has excellent heat resistance and small temperature coefficient of resistance, can overload in a short time, can bear larger current in a short time, can buffer the instant of starting up, and can calculate a proper resistance value according to the magnitude of the impact current; the relay can select a proper relay according to the voltage value of the direct current output end of the switching power supply.
During operation, alternating current power supply inputs, through fuse RD1, carries out the filtering through wave filter RM1 again, and the follow-up circuit is switched on through cement resistance in the twinkling of an eye in the start, and after the power normally started, direct current output terminal output voltage, relay coil connect direct current output terminal, and after output voltage stabilized, the relay was inhaled, and the resistance is short circuit, and follow-up circuit passes through relay contact and switches on, and the power lasts uninterrupted duty.
The utility model has the advantages that: the circuit design is simple and reliable, the number of electronic components is small, the cost is low, the starting-up impact current can be effectively inhibited, the reliability of the power supply is improved, and the service life of the power supply is prolonged.
The present invention will be further explained with reference to the drawings.
Drawings
Fig. 1 is a schematic circuit diagram of embodiment 1 of the present invention;
fig. 2 is a schematic circuit diagram of embodiment 2 of the present invention;
fig. 3 is a schematic circuit diagram according to embodiment 2 of the present invention.
In the figure, 1, a switching power supply circuit; 2. a delay circuit; 3. and the voltage of the output end.
Detailed Description
Example 1
As shown in fig. 1, the utility model provides a reduce switching power supply impulse current's circuit includes switching power supply circuit 1 at least, has concatenated protecting against shock resistance R2 at switching power supply circuit 1's input, has connect relay switch's normally open end switch at protecting against shock resistance R2's both ends, switching power supply circuit 1's output voltage 3 have at least all the way with relay control end electric connection, supply with relay drive operating voltage, switching power supply circuit 1's output voltage 3's output stabilization time is greater than 10 ms.
During operation, alternating current power supply input passes through fuse RD1, and then carries out filtering through filter EM1, after filter EM1, through air switch QF1, protecting against shock resistance R2 and series-parallel capacitor group (C1 \ C2\ C3, C4\ CN) entering switch power supply circuit 1's input, the switch power supply circuit 1 is switched on through protecting against shock resistance R2 in the moment of starting up, after the power supply normally starts up, the output voltage of switch power supply circuit 1's output, output voltage of output is wherein supply relay coil all the way, after output voltage is stable, the relay is driven to work, the normally open end of relay is inhaled, protecting against shock resistance R2 is short circuited, switch power supply circuit 1 transitions to the relay contact again and switches on, the power supply continues uninterrupted operation.
Example 2
As shown in fig. 1, the utility model provides a reduce switching power supply impulse current's circuit includes switching power supply circuit 1 at least, has concatenated protecting against shock resistance R1 at switching power supply circuit 1's input, and protecting against shock resistance R1 is cement resistance, and cement resistance heat resistance is excellent, and the resistance temperature coefficient is little, and the short time overload can bear great electric current the short time, can do the buffering in the twinkling of an eye of the start, according to impulse current's size, can calculate the resistance value of suitable cement resistance.
Example 3
As shown in fig. 2, the utility model provides a reduce circuit of switching power supply impulse current, include switching power supply circuit 1 at least, it has shock-proof resistance R1 to concatenate at switching power supply circuit 1's input, shock-proof resistance R1 is the cement resistance, the cement resistance heat resistance is excellent, resistance temperature coefficient is little, short time overload, can bear great electric current in the short time, can do the buffering at the moment of starting, according to the size of impulse current, can calculate the resistance value of suitable cement resistance; the cement resistor comprises two cement resistors which are used in parallel. Such as R1 and R2 in fig. 2.
Example 4
As shown in fig. 3, the utility model provides a reduce switching power supply impulse current's circuit includes switching power supply circuit 1 at least, it has the cement resistance to concatenate at switching power supply circuit 1's input, the cement resistance has two parallelly connected, cement resistance heat resistance is excellent, resistance temperature coefficient is little, short time overload, can bear great electric current in the short time, can do the buffering in the twinkling of an eye of start, according to impulse current's size, can calculate suitable cement resistance, R1 and R2 select 20W, 30 omega.
The two ends of the cement resistor are connected with a normally-open end switch of a relay switch in parallel, at least one path of output end voltage 3 of a switch power supply circuit 1 is electrically connected with a relay control end through a delay circuit 2, the voltage is supplied to the voltage for driving the relay at 5-12V, and the output stable time of the output end voltage 3 of the switch power supply circuit 1 is more than 10 ms; the delay circuit 2 is a timing circuit.
During operation, alternating current power supply inputs, through fuse RD1, carries out the filtering through wave filter EM1 again, and switching power supply circuit 1 is switched on through cement resistance in the twinkling of an eye in the start, and after the power normally started, delay circuit 2 drive relay coil, and the relay is driven work, and the relay is opened end and is inhaled in normal beginning, and cement resistance is short circuit, and switching power supply circuit 1 transitions to the relay contact switch-on again, and the power lasts uninterrupted duty.
The delay time of example 4 is 10-100 ms.
Claims (7)
1. A circuit for reducing the starting-up impact current of a switching power supply is characterized in that: at least comprises a switch power supply circuit (1), an anti-impact resistor is connected in series at the input end of the switch power supply circuit (1), a normally-open switch of a relay switch is connected at the two ends of the anti-impact resistor, and the output end voltage (3) of the switch power supply circuit (1) is at least electrically connected with the power end of the relay to supply the working voltage of the relay.
2. The circuit for reducing the start-up inrush current of a switching power supply as claimed in claim 1, wherein: the output end voltage (3) of the switch power supply circuit (1) is electrically connected with the relay power supply end to form the delay circuit (2).
3. A circuit for reducing the switching power supply startup surge current according to claim 2, characterized in that: the delay circuit (2) is a timing circuit.
4. The circuit for reducing the start-up inrush current of a switching power supply as claimed in claim 1, wherein: the anti-impact resistor is a cement resistor.
5. The circuit for reducing the start-up inrush current of a switching power supply as claimed in claim 1, wherein: the cement resistors are connected in parallel.
6. A circuit for reducing the switching power supply startup surge current according to claim 2, characterized in that: the delay time of the delay circuit (2) is 10-100 ms.
7. The circuit for reducing the start-up inrush current of a switching power supply as claimed in claim 4, wherein: the cement resistor is 20W and 30 omega.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920723660.0U CN210093108U (en) | 2019-05-20 | 2019-05-20 | Circuit for reducing impulse current of switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920723660.0U CN210093108U (en) | 2019-05-20 | 2019-05-20 | Circuit for reducing impulse current of switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210093108U true CN210093108U (en) | 2020-02-18 |
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ID=69479157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920723660.0U Active CN210093108U (en) | 2019-05-20 | 2019-05-20 | Circuit for reducing impulse current of switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210093108U (en) |
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2019
- 2019-05-20 CN CN201920723660.0U patent/CN210093108U/en active Active
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