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Soft switch circuit of power supply

A technology of power supply and switching circuit, which is applied in the direction of high-efficiency power electronic conversion, output power conversion device, electrical components, etc., can solve the problems of large switching loss and electromagnetic interference, and achieve low conduction loss, low switching loss, The effect of suppressing electromagnetic interference

Inactive Publication Date: 2009-10-21
力亿企业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, its above figure 1 and figure 2 When the two structures operate at high frequencies, they will cause large switching losses and electromagnetic interference, which are their main defects

Method used

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Embodiment Construction

[0043] Please refer to image 3 The soft switching circuit of the power supply of the present invention mainly includes a bridgeless rectifier circuit 10 and an auxiliary circuit 20; the auxiliary circuit 20 is connected to the bridgeless rectifier circuit 10, and the bridgeless rectifier circuit 10 includes There is at least one filter inductor 11, two main switches 12, two diodes 13 and a capacitor 14, wherein the filter inductor 11 is connected to the first diode 13, the filter inductor 11 is a coupled filter inductor or an uncoupled filter inductor, And the first diode 13 connects the second diode 13 again, and the second diode 13 connects the first main switch 12, and the first main switch 12 connects the second main switch 12 again, the diode 13 and the main switch 12 A capacitor 14 is connected in parallel to remove the bridge rectifier at the input end to reduce conduction loss; and the auxiliary circuit 20 includes at least one resonant inductor 21, an auxiliary switc...

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Abstract

The present invention provides a soft switching circuit of power supplier, including a non-bridge rectifier circuit connecting with auxiliary circuit; the non-bridge rectifier circuit includes at least one filter inductance, two main switches, two diodes and a capacitor, the filter inductance is connected with the first diode, the first diode is connected with the second diode, the second diode is connected with the first main switch, and the first main switch is further connected with the second main switch, two diodes and two main switches are parallel with the capacitor to reduce the guide loss; the auxiliary circuit includes at least one resonant inductor, an auxiliary switch, at least two diodes and a voltage source circuit, the two diodes is connected with the resonant inductor, and further connected with the voltage source circuit, the voltage source circuit is further connected with the auxiliary switch; thereby, the soft switching circuit completes the characteristics of main switch zero voltage switch and auxiliary switch zero current switch, and having lower guide loss and the lower switch loss at the same time.

Description

technical field [0001] The invention relates to a soft switching circuit of a power supply, which is designed to connect an auxiliary circuit in a bridgeless rectifier circuit, so as to complete the soft switching of zero voltage transfer, reduce switching loss, and have The characteristics of low conduction loss and low switching loss are suitable for power supplies or similar structures. Background technique [0002] With the development of today's technology, the application of power supplies is becoming more and more extensive. More and more products will use power supplies, especially in personal computers, industrial computers, switches, cash registers, and printing equipment. ..... etc. AC / DC AC / DC power conversion is required, and the power supply is turned on and off through a switch structure. [0003] At present, most power supplies use such as figure 1 The power factor corrected power converter with boost structure shown in , it first converts the AC power to D...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/217
CPCY02B70/1491Y02B70/10
Inventor 蔡宪逸陈德玉夏存孝
Owner 力亿企业股份有限公司
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