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Novel electro-magnetic interference (EMI) filtering capacitance loss reducing circuit

A filter capacitor, full-wave rectifier circuit technology, applied in electrical components, output power conversion devices, irreversible AC power input into DC power output and other directions, can solve problems such as consumption of commercial AC power

Inactive Publication Date: 2011-05-25
马丽娟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] EMI filter capacitors are usually connected after commercial AC power to filter out the noise of commercial AC power and the noise of electrical equipment. Due to the existence of capacitive reactance of this EMI filter capacitor in the AC circuit, current will flow through the EMI filter capacitor. , thus consuming the energy of commercial AC power, the traditional practice is to ignore the loss of this EMI filter capacitor

Method used

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  • Novel electro-magnetic interference (EMI) filtering capacitance loss reducing circuit
  • Novel electro-magnetic interference (EMI) filtering capacitance loss reducing circuit
  • Novel electro-magnetic interference (EMI) filtering capacitance loss reducing circuit

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Embodiment Construction

[0008] figure 2 The structural diagram of the first embodiment of the present invention, the connection mode is that the half-wave rectification circuit is connected in series between the commercial AC power and the filter capacitor, and the switch circuit is connected in parallel at both ends of the half-wave rectification circuit;

[0009] Its principle is:

[0010] When the power consumption of the electrical equipment is less than the set power consumption, the half-wave rectification circuit between the commercial AC power and the EMI filter capacitor rectifies the AC power into DC power, and the impedance of the EMI filter capacitor to the DC power is infinite, so there is no current flow in the EMI filter capacitor , so the loss of the EMI filter capacitor is reduced, and the diode in the half-wave rectification circuit can be connected forward or reversely;

[0011] When the power consumption of the electrical equipment is greater than the set power consumption, the ...

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Abstract

The invention relates to a novel electro-magnetic interference (EMI) filtering capacitance loss reducing circuit and aims to solve the problem of further reducing EMI filtering capacitance loss when the power consumption of electrical equipment is smaller than set power consumption. For fulfilling the aim, a rectifier circuit is connected in series between a commercial alternating current power supply and an EMI filtering capacitor, wherein the rectifier circuit may be a half-wave rectifier circuit or a full-wave rectifier circuit; and when the rectifier circuit is a half-wave rectifier circuit, a switch circuit which may be a relay, a triode, an MOS, silicon controlled rectifier and other elements is connected on two ends of the half-wave rectifier circuit in parallel.

Description

technical field [0001] The invention relates to a method for reducing the loss of EMI filter capacitance. Background technique [0002] EMI filter capacitors are usually connected after commercial AC power to filter out the noise of commercial AC power and the noise of electrical equipment. Due to the existence of capacitive reactance of this EMI filter capacitor in the AC circuit, current will flow through the EMI filter capacitor. , thus consuming the energy of commercial AC power, the traditional approach is to ignore the loss of this EMI filter capacitor. Contents of the invention [0003] The purpose of the present invention is to solve the problem of further reducing the loss of the EMI filter capacitor when the power consumption of the electric device is less than the set power consumption. [0004] In order to achieve the above object, the present invention includes: a rectifier circuit, an EMI filter capacitor and a switch circuit. The rectifier circuit is connec...

Claims

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Application Information

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IPC IPC(8): H02M1/14H02M7/04
Inventor 马丽娟
Owner 马丽娟