CN210839381U - Circuit for reducing input impact current - Google Patents
Circuit for reducing input impact current Download PDFInfo
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- CN210839381U CN210839381U CN201922312246.3U CN201922312246U CN210839381U CN 210839381 U CN210839381 U CN 210839381U CN 201922312246 U CN201922312246 U CN 201922312246U CN 210839381 U CN210839381 U CN 210839381U
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Abstract
The utility model discloses a circuit for reducing input impact current, which belongs to the technical field of switching power supplies and comprises a live wire end L, a first rectifier bridge DB1, a current-limiting resistor R1, a first filter capacitor C1, a relay K1, a second filter capacitor C2, a first rectifier diode D1 and a transformer T1; the first rectifier bridge DB1 is composed of two second rectifier diodes D2 and two third rectifier diodes D3, the two second rectifier diodes D2 are connected in series, the two third rectifier diodes D3 are connected in series, the two second rectifier diodes D2 connected in series are connected in parallel with the two third rectifier diodes D3 connected in series, and the first rectifier bridge DB1 is provided with ends a, b, c and D; the live wire end L is electrically connected with the end a of the first rectifier bridge DB1, and the end b of the first rectifier bridge DB1 is electrically connected with the input end of the current-limiting resistor R1; the output end of the current limiting resistor R1 is electrically connected with the input end of the first filter capacitor C1, so that the circuit can easily limit the input impact current to be less than 10A without reducing the power efficiency.
Description
Technical Field
The utility model relates to a switching power supply technical field, more specifically say, relate to a reduce input impulse current's circuit.
Background
The switching power supply is a power supply which utilizes modern power electronic technology to control the on-off time ratio of a switching tube and maintain stable output voltage, generally comprises a Pulse Width Modulation (PWM) control IC and a MOSFET, and is continuously innovated along with the development and innovation of the power electronic technology.
The switch power supply usually needs to charge the input electrolytic capacitor with a large current at the moment of power supply starting, and particularly when the input voltage is high, the starting impact current is large, and in some specific occasions, the air switch can be directly tripped by the large impact current.
SUMMERY OF THE UTILITY MODEL
1. Technical problem to be solved
To the problem that exists among the prior art, the utility model aims to provide a reduce input impact current's circuit, its this circuit can easily be within 10A input impact current limits, and can not reduce power efficiency
2. Technical scheme
In order to solve the above problem, the utility model adopts the following technical scheme:
a circuit for reducing input impact current comprises a live wire end L, a first rectifier bridge DB1, a current-limiting resistor R1, a first filter capacitor C1, a relay K1, a second filter capacitor C2, a first rectifier diode D1 and a transformer T1;
the first rectifier bridge DB1 is provided with ends a, b, c and d;
the live wire end L is electrically connected with the end a of the first rectifier bridge DB1, and the end b of the first rectifier bridge DB1 is electrically connected with the input end of the current-limiting resistor R1;
the output end of the current-limiting resistor R1 is electrically connected with the input end of a first filter capacitor C1, the output end of the first filter capacitor C1 is electrically connected with the end d of a first rectifier bridge DB1, and the end C of the first rectifier bridge DB1 is electrically connected with a zero line end N;
the relay K1 is connected with a current limiting resistor R1 in parallel;
the output end of the transformer T1 is electrically connected with the input end of a first rectifier diode D1, the output end of the first rectifier diode D1 is electrically connected with the input end of a second filter capacitor C2, and the output end of the first rectifier diode D1 is also electrically connected with the input end of a relay K1;
the output end of the second filter capacitor C2 is electrically connected with the input end of the relay K1, and the output end of the second filter capacitor C2 is also connected with the input end of the transformer T1.
As a preferred scheme of the utility model, first rectifier bridge DB1 comprises two second rectifier diode D2 and two third rectifier diode D3, two second rectifier diode D2 series connection, two third rectifier diode D3 series connection, and two second rectifier diode D2 after establishing ties and two third rectifier diode D3 parallel connection after establishing ties.
As a preferable embodiment of the present invention, the first filter capacitor C1 is an electrolytic capacitor.
As a preferable embodiment of the present invention, the second filter capacitor C2 is an electrolytic capacitor.
As a preferred scheme of the utility model, relay K1 is provided with switch K1, switch K2 and switch K3, first rectifier bridge DB 1's b end is connected with switch K1, switch K1 is connected with switch K2 and switch K3 respectively, realizes that current limiting resistor R1's route and disconnection.
3. Advantageous effects
Compared with the prior art, the utility model has the advantages of:
according to the scheme, a current-limiting resistor R1 is coupled between a first rectifier bridge DB1 and a first filter capacitor C1, so that the impact current of a switching power supply is limited by R1 at the moment of opening, a small impact current is obtained, when the switching power supply is opened, the energy of a transformer T1 coupled to a winding passes through a first rectifier diode D1, a stable voltage is obtained by a second filter capacitor C2, the power is supplied to a relay K1, the relay K1 acts to be a normally closed electric shock, namely the switch K1 is connected with a switch K2, and therefore a current-limiting resistor R1 is bypassed, and the R1 is enabled not to limit the current and has no loss when in normal work.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Detailed Description
The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention based on the embodiments of the present invention.
Example (b):
referring to fig. 1, a circuit for reducing an input inrush current includes a live wire terminal L, a first rectifier bridge DB1, a current limiting resistor R1, a first smoothing capacitor C1, a relay K1, a second smoothing capacitor C2, a first rectifier diode D1, and a transformer T1; the first rectifier bridge DB1 is composed of two second rectifier diodes D2 and two third rectifier diodes D3, the two second rectifier diodes D2 are connected in series, the two third rectifier diodes D3 are connected in series, the two second rectifier diodes D2 connected in series are connected in parallel with the two third rectifier diodes D3 connected in series, and the first rectifier bridge DB1 is provided with ends a, b, c and D; the live wire end L is electrically connected with the end a of the first rectifier bridge DB1, and the end b of the first rectifier bridge DB1 is electrically connected with the input end of the current-limiting resistor R1; the output end of the current-limiting resistor R1 is electrically connected with the input end of the first filter capacitor C1, the output end of the first filter capacitor C1 is electrically connected with the end d of the first rectifier bridge DB1, and the end C of the first rectifier bridge DB1 is electrically connected with the zero line end N; the relay K1 is connected in parallel with the current limiting resistor R1; the output end of the transformer T1 is electrically connected with the input end of a first rectifier diode D1, the output end of a first rectifier diode D1 is electrically connected with the input end of a second filter capacitor C2, and the output end of the first rectifier diode D1 is also electrically connected with the input end of a relay K1; the output end of the second filter capacitor C2 is electrically connected with the input end of the relay K1, and the output end of the second filter capacitor C2 is also connected with the input end of the transformer T1.
Preferably, the first smoothing capacitor C1 is an electrolytic capacitor, the second smoothing capacitor C2 is an electrolytic capacitor, the relay K1 is provided with a switch K1, a switch K2 and a switch K3, the end b of the first rectifier bridge DB1 is connected with the switch K1, and the switch K1 is respectively connected with a switch K2 and a switch K3, so that the on-off and the off-off of the current limiting resistor R1 are realized.
The working principle is as follows: a current limiting resistor R1 is coupled between the first rectifier bridge DB1 and the first filter capacitor C1, so that the surge current of the switching power supply is limited by R1 at the opening moment, and thus a very small surge current is obtained, when the switching power supply is opened, the energy of the transformer T1 coupled to the winding passes through the first rectifier diode D1, the second filter capacitor C2 obtains a stable voltage to supply power to the relay K1, the relay K1 acts to a normally closed electric shock, namely the switch K1 is connected with the switch K2, so that the current limiting resistor R1 is bypassed, the current of the R1 is not limited and has no loss when the R1 works normally, and thus the input surge current can be easily limited within 10A without reducing the power supply efficiency.
The above description is only the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution and the improvement concept of the present invention within the technical scope disclosed in the present invention.
Claims (5)
1. A circuit for reducing input inrush current, comprising: the power supply comprises a live wire end (L), a first rectifier bridge (DB1), a current-limiting resistor (R1), a first filter capacitor (C1), a relay, a second filter capacitor (C2), a first rectifier diode (D1) and a transformer (T1);
the first rectifier bridge (DB1) is provided with ends a, b, c and d;
the live wire end (L) is electrically connected with the end a of a first rectifier bridge (DB1), and the end b of the first rectifier bridge (DB1) is electrically connected with the input end of a current-limiting resistor (R1);
the output end of the current-limiting resistor (R1) is electrically connected with the input end of a first filter capacitor (C1), the output end of the first filter capacitor (C1) is electrically connected with the end d of a first rectifier bridge (DB1), and the end C of the first rectifier bridge (DB1) is electrically connected with the zero line end (N);
the relay is connected in parallel with a current limiting resistor (R1);
the output end of the transformer (T1) is electrically connected with the input end of a first rectifying diode (D1), the output end of the first rectifying diode (D1) is electrically connected with the input end of a second filter capacitor (C2), and the output end of the first rectifying diode (D1) is also electrically connected with the input end of a relay;
the output end of the second filter capacitor (C2) is electrically connected with the input end of the relay, and the output end of the second filter capacitor (C2) is also connected with the input end of the transformer (T1).
2. The circuit for reducing input inrush current of claim 1, wherein: the first rectifier bridge (DB1) is composed of two second rectifier diodes (D2) and two third rectifier diodes (D3), two the second rectifier diodes (D2) are connected in series, two the third rectifier diodes (D3) are connected in series, and two second rectifier diodes (D2) after being connected in series are connected in parallel with two third rectifier diodes (D3) after being connected in series.
3. The circuit for reducing input inrush current of claim 1, wherein: the first filter capacitor (C1) is an electrolytic capacitor.
4. The circuit for reducing input inrush current of claim 1, wherein: the second filter capacitor (C2) is an electrolytic capacitor.
5. The circuit for reducing input inrush current of claim 1, wherein: the relay is provided with a switch k1, a switch k2 and a switch k3, the b end of the first rectifier bridge (DB1) is connected with a switch k1, and the switch k1 is respectively connected with a switch k2 and a switch k3, so that the on-off of a current limiting resistor (R1) is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922312246.3U CN210839381U (en) | 2019-12-20 | 2019-12-20 | Circuit for reducing input impact current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922312246.3U CN210839381U (en) | 2019-12-20 | 2019-12-20 | Circuit for reducing input impact current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210839381U true CN210839381U (en) | 2020-06-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922312246.3U Active CN210839381U (en) | 2019-12-20 | 2019-12-20 | Circuit for reducing input impact current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210839381U (en) |
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2019
- 2019-12-20 CN CN201922312246.3U patent/CN210839381U/en active Active
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