CN216162611U - Switching power supply starts and strikes limit surge circuit - Google Patents
Switching power supply starts and strikes limit surge circuit Download PDFInfo
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- CN216162611U CN216162611U CN202121482568.3U CN202121482568U CN216162611U CN 216162611 U CN216162611 U CN 216162611U CN 202121482568 U CN202121482568 U CN 202121482568U CN 216162611 U CN216162611 U CN 216162611U
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Abstract
The utility model discloses a switching power supply starting impact limit surge circuit, which comprises a surge current suppression circuit and a silicon controlled rectifier control circuit which are connected in parallel, wherein the surge current suppression circuit comprises a silicon controlled rectifier and is connected with an input bus terminal and used for limiting impact current on an input bus; and the silicon controlled rectifier control circuit is connected with the silicon controlled rectifier in the surge current suppression circuit and is used for controlling the on-off of the silicon controlled rectifier in the surge current suppression circuit. The switching power supply starting impact surge limiting circuit provided by the utility model can complete the suppression of surge impact current and simultaneously reduce the heat power consumption of the switching power supply when the switching power supply is started, thereby improving the efficiency of the whole power supply. The utility model is also suitable for the switching power supply with higher switching frequency when in use, and the circuit has small volume, low cost, safety, stability and wide application prospect.
Description
Technical Field
The utility model belongs to the technical field of switching power supply circuit design, and particularly relates to a switching power supply starting impact limit surge circuit.
Background
When the existing switching power supply with alternating current mains supply input is used and the external part is not subjected to soft start, the starting impact current is dozens of times to hundreds of times of rated current, so that under the form, on one hand, impact is caused to a power grid, on the other hand, larger impact current is also a potential hazard to the service life of the switching power supply, and the switching power supply can be directly damaged under severe conditions. Aiming at the problem, most of the market connects a thermistor in series on an input alternating current bus to reduce the impact current when a switching power supply is started, but the mode has two disadvantages, on one hand, the capability of limiting the impact current in a high-temperature environment is greatly reduced due to the characteristic requirement of the thermistor; on the other hand, because the thermistor is connected in series with the input bus, a part of power consumption is consumed after the power supply is started, and the efficiency of the switching power supply is low.
Disclosure of Invention
The utility model aims to provide a switching power supply starting impact surge limiting circuit aiming at the problem of starting impact of the existing switching power supply module. The circuit of the utility model can reduce heat consumption to improve the efficiency of the switching power supply while limiting the inrush current of startup.
In order to achieve the purpose, the technical scheme adopted by the utility model comprises the following steps:
a switching power supply starting impact limit surge circuit comprises a surge current suppression circuit and a silicon controlled rectifier control circuit which are connected in parallel, wherein the surge current suppression circuit comprises a silicon controlled rectifier and is connected with an input bus terminal and used for limiting impact current on an input bus; and the silicon controlled rectifier control circuit is connected with the silicon controlled rectifier in the surge current suppression circuit and is used for controlling the on-off of the silicon controlled rectifier in the surge current suppression circuit.
Furthermore, the resistor in the surge current suppression circuit comprises a thermistor and a thyristor, one end of the thermistor is connected with the anode of the thyristor in parallel, and the parallel network of the thermistor is connected with the high end of the input bus; the other end of the thermistor is connected with the cathode of the controlled silicon in parallel, and the parallel network of the thermistor is connected with the low end of the input bus.
Furthermore, the thyristor control circuit comprises an optical coupler, a resistor R1, a resistor R2 and a resistor R3, wherein a pin 1 of the optical coupler is connected with one end of the resistor R1, a pin 2 is connected with an output ground, and a pin 3 is suspended; the optical coupler has 4 pins connected to the parallel network of the resistor R3 and the controllable silicon G pole, 5 pins suspended, 6 pins connected to one end of the resistor R2, the other end of the resistor R2 connected to the anode of the controllable silicon in parallel, the parallel network connected to the high end of the input bus, the other end of the resistor R3 connected to the cathode of the controllable silicon, and the parallel network connected to the low end of the input bus.
Furthermore, the silicon controlled rectifier in the surge current suppression circuit is selected to be BTA 41-600B.
Furthermore, the thermistor NTC in the surge current suppression circuit is selected to be 5D-20.
Further, the optical coupling in the silicon controlled control circuit is selected as MOC 3081.
Compared with the prior art, the utility model has the following beneficial effects:
the switching power supply starting impact surge limiting circuit provided by the utility model can complete the suppression of surge impact current and simultaneously reduce the heat power consumption of the switching power supply when the switching power supply is started, thereby improving the efficiency of the whole power supply. The utility model is also suitable for the switching power supply with higher switching frequency when in use, and the circuit has small volume, low cost, safety, stability and wide application prospect.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The utility model is described in further detail below with reference to the accompanying drawings:
with reference to fig. 1, the utility model discloses a switching power supply start-up impact surge limiting circuit, which comprises a surge current suppression circuit and a thyristor control circuit connected in parallel, wherein the surge current suppression circuit comprises a thyristor, and is connected with an input bus terminal and used for limiting an impact current on an input bus; the controlled silicon control circuit is connected with controlled silicon in the surge current suppression circuit and is used for controlling the on-off of the controlled silicon in the surge current suppression circuit.
The thyristor control circuit is connected with the thermistor in parallel, and the thermistor is mainly used for bypassing the switch power supply circuit in a steady state so as to reduce the loss of the switch power supply and improve the efficiency.
Specifically, the surge current suppression circuit comprises a thermistor and a thyristor which are connected, wherein the thermistor is an NTC (negative temperature coefficient), the thyristor is selected from BTA41600B, one end of the NTC is connected with the anode of the thyristor in parallel, and the parallel network of the NTC is connected with the high end (end A) of the input bus; the other end of the NTC is connected with the cathode of the controllable silicon in parallel, and the parallel network of the NTC is connected with the low end (end B) of the input bus.
The silicon controlled control circuit comprises an optocoupler GU1, a resistor R1, a resistor R2 and a resistor R3, wherein a pin 1 of the optocoupler GU1 is connected with one end of a resistor R1, a pin 2 is connected with an output ground, and a pin 3 is suspended; the parallel network of the 4-pin resistor R3 and the controllable silicon G pole of the optical coupler GU1 is characterized in that a pin 5 is suspended, a pin 6 of the optical coupler GU1 is connected with one end of the resistor R2, the other end of the resistor R2 is connected with the anode of the controllable silicon in parallel, the parallel network is connected with the high end (end A) of the input bus, the other end of the resistor R3 is connected with the cathode of the controllable silicon, and the parallel network is connected with the low end (end B) of the input bus.
The working principle of the utility model is as follows: when the switching power supply is started, input voltage enters a surge limiting impact circuit, input bus voltage charges a post-stage rectifying filter capacitor through a thermistor NTC, the thermistor NTC is connected in series with the input bus, surge impact current is limited within a certain range, after the switching power supply is completely output, output voltage enters a primary side of an optocoupler GU1 through a resistor R1, after an optocoupler GU1 is conducted, a thyristor G pole has high-level output to turn on the thyristor, the thyristor is turned on and bypasses the thermistor NTC connected in series to the bus, as the conduction voltage drop of the thyristor is far smaller than the thermistor, and the conducted internal resistance is also far smaller than the resistance of the thermistor, the purpose of limiting the start-up surge current is achieved, power consumption is also reduced, and the efficiency of the whole switching power supply is improved. When the switch power supply is turned off, the silicon controlled rectifier is not conducted, and when the switch power supply is turned on next time, the bus voltage firstly passes through the NTC to limit the surge current and then passes through the silicon controlled rectifier to reduce the heat power consumption.
Taking a common 500W power supply as an example, the SCR of the surge limiting circuit part is selected to be BTA41-600B (nominal voltage 600V, nominal current 40A), and the NTC is selected to be 5D-20 (nominal current 3A). The optical coupling selection type in the silicon controlled control circuit is MOC3081, which is a special device for limiting surge current, the primary side is connected with a low-voltage input control signal, and the secondary side is connected with a resistor and then can be directly connected to a single AC source in a bridging way. The secondary side bridge connection resistor is a 5W/360R power resistor, on one hand, bears the energy at the moment of conduction of the controllable silicon, and on the other hand, is used for limiting the current of the secondary side.
The switching power supply starting impact surge limiting circuit provided by the utility model can complete the suppression of surge impact current and simultaneously reduce the heat power consumption of the switching power supply when the switching power supply is started, thereby improving the efficiency of the whole power supply. The circuit is also suitable for a switching power supply with higher switching frequency in use, and has the advantages of small volume, simple internal structure, low cost, safety, stability and wide application prospect.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be made by those skilled in the art without inventive work within the technical scope of the present invention are included in the scope of the present invention.
Claims (4)
1. A switching power supply starting impact surge limiting circuit is characterized by comprising a surge current suppression circuit and a silicon controlled rectifier control circuit which are connected in parallel, wherein the surge current suppression circuit comprises a silicon controlled rectifier and is connected with an input bus terminal and used for limiting impact current on an input bus; the silicon controlled rectifier control circuit is connected with a silicon controlled rectifier in the surge current suppression circuit and is used for controlling the on-off of the silicon controlled rectifier in the surge current suppression circuit;
the surge current suppression circuit comprises a thermistor and a controlled silicon, wherein one end of the thermistor is connected with the anode of the controlled silicon in parallel, and the parallel network of the thermistor is connected with the high end of the input bus; the other end of the thermistor is connected with the cathode of the controlled silicon in parallel, and the parallel network of the thermistor is connected with the low end of the input bus;
the thyristor control circuit comprises an optical coupler, a resistor R1, a resistor R2 and a resistor R3, wherein a pin 1 of the optical coupler is connected with one end of the resistor R1, a pin 2 is connected with an output ground, and a pin 3 is suspended; the optical coupler has 4 pins connected to the parallel network of the resistor R3 and the controllable silicon G pole, 5 pins suspended, 6 pins connected to one end of the resistor R2, the other end of the resistor R2 connected to the anode of the controllable silicon in parallel, the parallel network connected to the high end of the input bus, the other end of the resistor R3 connected to the cathode of the controllable silicon, and the parallel network connected to the low end of the input bus.
2. The switching power supply startup surge limiting circuit according to claim 1, wherein the thyristor in the surge current suppression circuit is selected from the type BTA 41-600B.
3. The switching power supply startup surge limiting circuit according to claim 1, wherein a thermistor in the surge current suppression circuit is selected from 5D-20.
4. The switching power supply starting impact limit surge circuit according to claim 1, wherein an optical coupler in the thyristor control circuit is selected as MOC 3081.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121482568.3U CN216162611U (en) | 2021-06-30 | 2021-06-30 | Switching power supply starts and strikes limit surge circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121482568.3U CN216162611U (en) | 2021-06-30 | 2021-06-30 | Switching power supply starts and strikes limit surge circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216162611U true CN216162611U (en) | 2022-04-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121482568.3U Active CN216162611U (en) | 2021-06-30 | 2021-06-30 | Switching power supply starts and strikes limit surge circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216162611U (en) |
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2021
- 2021-06-30 CN CN202121482568.3U patent/CN216162611U/en active Active
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Wang Ke Inventor after: Zhang Chaoyang Inventor after: Du Chen Inventor before: Wang Ke Inventor before: Zhang Chaoyang Inventor before: Du Chen |
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| CB03 | Change of inventor or designer information |