Capacitor energy discharging circuit capable of reducing power loss and power supply circuit thereof

Abstract

The invention discloses a capacitor energy discharging circuit capable of reducing power loss and a power supply circuit thereof. The power supply circuit is connected with an AC (Alternating Current) power supply and a load, wherein the AC power supply outputs an AC voltage, the power supply circuit at least comprises a power supply input end, a filter unit, a main circuit and a capacitor energydischarging circuit, wherein the power supply input end is used for receiving the AC voltage; the filter unit is connected with the power supply input end and is used for filtering the noise of the AC voltage; the main circuit is connected with the filter unit and the load and is used for converting the filtered AC voltage into an output DC (Direct Current) voltage and sending to the load; and the capacitor energy discharging circuit is connected with the power supply input end, the filter unit and a common junction and is used for detecting whether the power supply input end receives the AC voltage or not and releasing electric energy stored in the filter unit when the detection result is negative. The capacitor energy discharging circuit provided by the invention not only accords with the standard formulated by the safety specification, but also can reduce power loss and further develop towards the direction of saving energy, reducing loss and improving the efficiency.

Description

technical field [0001] The invention relates to a discharge circuit, in particular to a capacitor energy discharge circuit capable of reducing power loss and a power supply circuit thereof. Background technique [0002] The power supply circuit that uses capacitors to filter and store energy is an indispensable electronic circuit for various electronic devices, such as computers, servers, etc. required DC voltage. [0003] see figure 1 , which is a schematic structural diagram of a known power supply circuit. As shown in the figure, the known power supply circuit 1 has a main circuit 10, which is connected between an AC power supply AC and a load 11, and is used to rectify an AC voltage output by the AC power supply AC into a transitional DC voltage, and according to The transitional DC voltage is converted into a specific level of DC voltage to drive the load 11 to operate. [0004] In addition, the known power supply circuit 1 also has a filter capacitor C 1 , which a...

AI Technical Summary

Problems solved by technology

[0008] The main purpose of the present invention is to provide a capacitive energy discharge circuit and its power supply circuit that can reduce power loss, so as to solve the problem that the known power supply circuit consumes power because the discharge resistor always constitutes a discharge circuit when it receives an AC voltage. Defects that cause unnecessary power loss in known power supply circuits

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