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Z source soft switch power factor correcting full bridge converter

A technology of power factor correction and full-bridge converter, which is applied in the direction of converting AC power input into AC power output, output power conversion device, intermediate conversion into DC conversion equipment, etc., which can solve the problem of power factor correction, Complicated control circuits and other issues, to achieve high reliability, realize output voltage, and achieve the effect of improvement

Inactive Publication Date: 2009-07-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the bridge arm of the series resonant full-bridge converter cannot pass through, so it is necessary to set a dead time, the control circuit is complicated, and power factor correction cannot be realized

Method used

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  • Z source soft switch power factor correcting full bridge converter
  • Z source soft switch power factor correcting full bridge converter
  • Z source soft switch power factor correcting full bridge converter

Examples

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Embodiment Construction

[0011] The implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0012] In order to facilitate the analysis of the working process, considering that the working frequency fs of the phase-shifted ZVZCS full-bridge converter is much greater than the grid-side AC voltage power frequency f z When analyzing the working process of the circuit of the present invention, it can be considered that the voltage and current input from the grid side are constant within a switching period, so the circuit before the Z-source converter can be equivalent to a DC voltage source V in And load the ozone generator with C d , C g , D Z Equivalent to the primary side of the transformer, respectively C d1 , C g1 , D Z1 , The transformer ratio is k, then figure 2 The circuit topology shown can be equivalent to image 3 The structure shown, its Boost corrector function can be equivalent to the circuit shown in Figure 4, where Figure 4a Is ...

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PUM

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Abstract

The invention relates to a Z-Source full-bridge converter for soft-switching PFC. The Z-Source full-bridge converter comprises a rectifier bridge (Q1), a full-bridge inverter (Q2) and a transformer (T), and is characterized in that an impedance network (Z) is also included; and the impedance network (Z) is connected in parallel between the rectifier bridge (Q1) and two inverter bridge legs of the full-bridge inverter (Q2). The existence of the impedance network (Z) avoids the damage caused by the direct connection between the two inverter bridge legs of the full-bridge inverter (Q2). When an upper bridge leg and a lower bridge leg of the full-bridge inverter (Q2) are directly connected with each other, the impedance network (Z) and the full-bridge inverter (Q2) form a voltage booster circuit, and correction of the input power factor can be realized through controlling the direct connection time of the upper bridge leg and the lower bridge leg. The Z-Source full-bridge converter forms a primary voltage booster circuit through the impedance network (Z) and the full-bridge inverter (Q2), and enhances the output voltage very easily through the secondary booster of the transformer (T), thereby being very suitable for an ozonizer power supply required to output high pressure.

Description

Technical field [0001] The invention relates to the technical field of AC-DC-AC conversion, in particular to a Z-source soft-switching power factor correction full-bridge converter. Background technique [0002] The existing ozone generator power supply generally adopts such as figure 1 The series resonant full-bridge converter shown in the equivalent load C of the ozone generator d , C g , Z front-end series inductance L s Realize resonance, so as to realize soft switching. However, due to the unique load characteristics of the ozone generator: when the voltage across the load exceeds 3kV, the air gap of the ozone generator breaks down and produces ozone, which is manifested in the load circuit as the air gap equivalent capacitance C g The reverse breakdown voltage is U cs =3kV bidirectional Zener diode D Z Bypass, the resonant frequency changes with the resonant frequency of the load at this time, and the full-bridge circuit no longer works in the soft switching state until th...

Claims

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Application Information

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IPC IPC(8): H02M5/42H02M5/453H02M1/42
CPCY02B70/126Y02B70/1491Y02B70/10Y02P80/10
Inventor 张波胡维肖文勋张桂东
Owner SOUTH CHINA UNIV OF TECH
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