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Automatic residual charge discharge circuit of switching power supply and control method thereof

A residual charge, switching power supply technology, used in electrical components, output power conversion devices, irreversible AC power input into DC power output and other directions, can solve the problem of manual discharge of energy storage capacitors, electric shocks, and energy storage capacitors. It is difficult to obtain venting and other issues to achieve the effects of low power consumption, fast response speed and strong venting ability

Inactive Publication Date: 2021-11-02
梁小捷
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Most of the switching power supply schemes in the existing market do not have the function of automatically discharging the energy storage capacitor. It is difficult to discharge the charge of the energy storage capacitor after the switching power supply is turned off, and the energy storage capacitor needs to be manually discharged, otherwise it is easy to cause AC current Risk of electric shock to persons when switched off

Method used

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  • Automatic residual charge discharge circuit of switching power supply and control method thereof
  • Automatic residual charge discharge circuit of switching power supply and control method thereof
  • Automatic residual charge discharge circuit of switching power supply and control method thereof

Examples

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Embodiment 1

[0028] see figure 1 , in an embodiment of the present invention, a capacitor discharge control circuit includes an AC input rectification and filtering unit 100, a residual charge discharge unit 300, and an AC voltage detection unit 200;

[0029] see again figure 1 , the input end of the input rectification filter unit is connected to the AC voltage, and the output end of the input rectification filter unit is connected to the input end of the residual charge discharge unit 300;

[0030] Thus, it should be noted that the input rectification and filtering unit is used for rectifying and filtering the AC voltage and storing charges in the energy storage capacitor.

[0031] see again figure 1 , the input terminal of the AC voltage detection unit 200 is connected to the input terminal of the AC input filter unit, and the output terminal of the AC voltage detection unit 200 is connected to the control terminal of the residual charge discharge unit 300;

[0032] Thus, it should b...

Embodiment 2

[0046] refer to figure 1 , 3 The difference from Embodiment 1 is that the residual charge discharge unit 300 includes a P-type MOS transistor Q100, three resistors R100, R101, R103, a diode D103, a Zener diode ZD100, and one end of the resistor R100 It is connected to the positive pole of the energy storage capacitor of the AC input rectification filter unit 100, the other end is connected to one end of the resistor R101 and the source of the MOS transistor Q100, the other end of the resistor R101 is connected to the gate of the MOS transistor Q100 and one end of the resistor R103, and the gate of the MOS transistor Q100 One end of the resistor R103 is connected, the other end of the resistor R103 is connected to the anode of the diode D103, the drain of the MOS transistor Q100 is grounded, the anode of the Zener diode ZD100 is connected to the gate of the MOS transistor Q100, and the cathode of the Zener diode ZD100 is connected to the source of the MOS transistor Q100.

[0...

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PUM

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Abstract

The invention discloses an automatic residual charge discharge circuit of a switching power supply, which relates to the technical field of switching power supplies and comprises an alternating-current input rectifying and filtering unit, an alternating-current voltage detection unit and a residual charge discharge unit. The alternating-current input rectifying and filtering unit is respectively connected with the alternating-current voltage detection unit and the residual charge discharge unit, and the alternating-current voltage detection unit is connected with the residual charge discharge unit. The invention provides a control method for an energy storage capacitor to automatically discharge residual charges after alternating current voltage outage of a switching power supply. The method comprises the steps of detecting the alternating current voltage through an alternating current voltage detection unit, so as to control a residual charge discharge unit to automatically discharge the residual charges in the energy storage capacitor, and enabling the energy storage capacitor to reach a safe voltage. The circuit has the advantages of low power consumption, high discharge capacity, high response speed, simple structure, low cost and the like.

Description

technical field [0001] The invention relates to the technical field of switching power supplies, in particular to a switching power supply residual charge automatic discharge circuit and a control method thereof. Background technique [0002] Switching power supply, also known as switching power supply and switching converter, is a high-frequency power conversion device and a type of power supply. Its function is to convert a level of voltage into the voltage or current required by the user through different forms of architecture. The input of the switching power supply is mostly AC power that is rectified and filtered into high-voltage DC power, and the required DC power is output through the isolation converter. [0003] Most of the switching power supply schemes in the existing market do not have the function of automatically discharging the energy storage capacitor. It is difficult to discharge the charge of the energy storage capacitor after the switching power supply ...

Claims

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Application Information

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IPC IPC(8): H02M1/32H02M7/06
CPCH02M1/32H02M7/06
Inventor 梁小捷
Owner 梁小捷
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