Zero-power-consumption releasing circuit of anti-interference capacitor at AC end of switching power supply

Abstract

The invention discloses a zero-power-consumption releasing circuit of an anti-interference capacitor at the AC end of a switching power supply and relates to the technical field of switching power supplies. The zero-power-consumption releasing circuit of the anti-interference capacitor at the AC end of the switching power supply comprises a first port, a second port, a third port and a fourth port, wherein one end of the first port is connected to a +12V power supply at the output end of the switching power supply, one end of the second port is connected to the negative electrode of the output end of the switching power supply, the other end of the second port is connected with the ground, and one end of the third port and one end of the fourth port are connected to two ends of the capacitor C connected with the AC220V input end of the switching power supply in parallel respectively. The zero-power-consumption releasing circuit of the anti-interference capacitor at the AC end of the switching power supply has the advantages of being simple, reasonable in design, and capable of achieving zero power consumption after the switching power supply is powered off and saving power resources.

Description

technical field [0001] The invention relates to the technical field of switching power supplies, in particular to a zero-power release circuit for an anti-interference capacitor on an AC terminal of a switching power supply. Background technique [0002] In order to reduce high-frequency interference during the design of the switching power supply, an anti-interference capacitor C (such as figure 1 As shown), but the capacitor is connected in parallel on the AC, because the capacitor has the function of charging and discharging, when the switching power supply is working, if the 220V plug of the switching power supply is suddenly pulled out, there will be 220V voltage on the parallel capacitor on the AC voltage. In order to be safe and prevent people from being shocked by touching both ends of the plug, a discharge resistor with a certain resistance value is connected in parallel at both ends of the capacitor. When the 220V voltage is disconnected, it will be discharged ins...

AI Technical Summary

Problems solved by technology

When the 220V voltage is disconnected, it will be discharged instantaneously to prevent a certain power loss. This power loss is generally around a few tenths of a watt, but as long as the AC220V power supply of the switching power supply is connected to the 220V voltage, no matter the electronic products provided by the switching power supply I am in the standby or power-on state, and this power loss will always occur, so long-term power consumption is not conducive to energy saving

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