Inductance element, power factor correction circuit and switch power supply

Abstract

The invention is suitable for the field of switch power supplies and provides an inductance element, a power factor correction circuit and a switch power supply. The inductance element comprises a magnetic core and a lead wound on the magnetic core; the magnetic core is an annular magnetic core; the lead is provided with a segmental point and divided into a first lead part and a second lead part by the segmental point; the segmental point of the lead is arranged at any point of the annular magnetic core; the first lead part of the lead is wound for the preset number of turns on one side of the annular magnetic core and then a first conductive pin is drawn out; the second lead part of the lead is wound for the preset number of turns on the other side of the annular magnetic core and then asecond conductive pin is drawn out. In the inductance element provided by the invention, the lead is wound for the preset number of turns on the annular magnetic core from the centre to two sides andthen the conductive pins are respectively drawn out, so that the power factor correction circuit using the inductance element does not generate noise spike, the risk of breaking down the switch tube is avoided, and the reliability and the stability of the power factor correction circuit are improved.

Description

technical field [0001] The invention belongs to the field of switching power supplies, and in particular relates to an inductance element, a power factor correction circuit and a switching power supply. Background technique [0002] The structure of the inductance element formed by the traditional winding method provided by the prior art is as follows: figure 1 As shown, the inductance element first winds the first layer clockwise on the magnetic core, and then winds the second layer counterclockwise, and so on until the required number of turns is completed. The inductance element made by this winding method can stabilize the circuit, but the current waveform output by the switching tube of the power factor correction circuit using this inductance element will produce a large noise spike (such as Figure 4A As shown), the noise spike 100 may break down the switch tube, thereby reducing the reliability and stability of the entire circuit. Contents of the invention [000...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the embodiments of the present invention is to provide an inductance element, aiming to solve the problem that the power factor correction circuit using the existing inductance element will generate noise spikes and cause breakdown of the switch tube

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