Nondestructive buffering zero-voltage soft switch full-bridged PWM DC-DC converter

Abstract

This invention relates to part voltage flexible switch bridge PWM DC-DC exchanger without buffer and relates to zero voltage flexile switch PWM DC-DC exchange technique. This invention comprises first isolation grating field tubes source ends connected to the leakage end of third isolation grating field with ninth capacitor between. This invention adds one lossless buffer circuit on side of transducer to reduce diode reverse voltage impacting.

Description

technical field [0001] The invention relates to the technical field of zero-voltage soft switching (ZVS) full-bridge PWM DC-DC conversion. Background technique [0002] The full-bridge converter topology is one of the most commonly used circuit topologies in DC-DC converter circuits at home and abroad, and it is the preferred topology in medium and high power applications, and has been extensively studied. This is mainly because it has obvious advantages such as smaller voltage and current ratings of power switching devices and higher utilization of power transformers. In order to reduce the volume of the converter, the switching frequency should be increased, but at the same time it brings high switching loss, which can be solved by using zero voltage technology. The efficiency of the traditional hard-switching converter is 70% to 75%, and the efficiency of the converter can reach more than 90% after adopting zero-voltage technology. On the basis of not changing the topol...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of reverse voltage overshoot in the secondary rectifier diode of the existing full-bridge ZVS PWM DC-DC converter, the present invention provides a zero-voltage soft-switching full-bridge PWMDC-DC converter with lossless buffering. The converter includes a first insulated gate field effect transistor Q 1 , the second insulated gate field effect transistor Q 2 , the third insulated gate field effect transistor Q 3 , the fourth insulated gate field effect transistor Q 4 , the first diode D 1 , the first capacitance C 1 , the second diode D 2 , the second capacitance C 2 , the third diode D 3 , the third capacitor C 3 , the fourth diode D 4 , the fourth capacitor C 4 , the fifth diode D 5 , the fifth capacitor C 5 , the sixth diode D 6 , the sixth capacitance C 6 , high frequency transformer T, seventh diode D 7 , the eighth diode D 8 , the first inductance L a , the second inductance L f , the third inductance L Ik , filter capacitor C f and load resistance R; the first insulated gate field effect transistor Q 1 , the second insulated gate field effect transistor Q 2 , the third insulated gate field effect transistor Q 3 and the fourth insulated gate field effect transistor Q 4 Constitute a full-bridge DC-DC conversion circuit, the first diode D 1 The two ends are connected in parallel to the first insulated gate field effect transistor Q 1 between the drain and source terminals, the first capacitor C 1 in parallel with the first diode D 1 both ends of the second diode D 2 The two ends of each are connected in parallel with the second insulated gate field effect transistor Q 2 between the drain and source terminals, the second capacitor C 2 in parallel with the second diode D 2 Both ends of the third diode D 3 The two ends of each are connected in parallel with the third insulated gate field effect transistor Q 3 between the drain and source terminals, a third capacitor C 3 in parallel with the third diode D 3 Both ends of the fourth diode D 4 Both ends of are connected in parallel with the fourth insulated gate field effect transistor Q 4 between the drain and source terminals, the fourth capacitor C 4 in parallel with the fourth diode D 4 The two ends; the second insulated gate field effect transistor Q 2 The source terminal of the fourth insulated gate field effect transistor Q 4 The drain terminal of is connected and this connected terminal B passes through the first inductance L a Connect the fifth diode D 5 The positive terminal and the sixth diode D 6 The negative terminal of the fifth diode D 5 The negative terminal is connected to the second insulated gate field effect transistor Q 2 The drain terminal of the sixth diode D 6 The positive terminal is connected to the fourth insulated gate field effect transistor Q 4 source terminal, the fifth capacitor C 5 in parallel with the fifth diode D 5 Both ends of the sixth capacitor C 6 Parallel to the sixth diode D 6 The two ends; the second insulated gate field effect transistor Q 2 The source end of the high-frequency transformer T is connected to the end of the same name of the primary winding, and the third inductance L Ik One end of the high-frequency transformer T is connected to the non-identical end of the primary winding, and the same-name end of the secondary winding of the high-frequency transformer T is connected to the seventh diode D 7 The positive terminal of the seventh diode D 7 The negative terminal is connected to the second inductor L f One end and the eighth diode D 8 The negative terminal of the eighth diode D 8 The positive end of the high-frequency transformer T is connected to the non-identical end of the secondary winding, and the second inductor L f The filter capacitor C is connected in parallel between the other end of the high frequency transformer T and the middle tap of the secondary winding f , filter capacitor C f The two ends of the load resistance R are connected in parallel; the converter also includes a seventh capacitor C 7 , the eighth capacitor C 8 , the ninth capacitor C g , the ninth diode D 9 , the tenth diode D 10 , the eleventh diode D 11 , the twelfth diode D 12 and the fourth inductance L g , the first insulated gate field effect transistor Q 1 The source terminal of the third insulated gate field effect transistor Q 3 The drain terminal of the connected terminal A is connected to the third inductance L Ik There is a ninth capacitor C connected in series between the other end of g , the seventh diode D 7 The positive terminal of the seventh capacitor C is connected 7 One end of the seventh capacitor C 7 The other end of the ninth diode D is connected 9 the negative terminal of the eleventh diode D 11 positive terminal of the ninth diode D 9 The positive terminal of the seventh diode D is connected 7 The negative terminal of the eighth diode D 8 the negative terminal of the tenth diode D 10 The positive terminal of the tenth diode D 10 The negative terminal is connected to the twelfth diode D 12 The positive terminal and the eighth capacitor C 8 One end of the eighth capacitor C 8 The other end is connected to the eighth diode D 8 The positive terminal of the eleventh diode D 11 The negative terminal is connected to the fourth inductor L g One end and the twelfth diode D 12 The negative terminal, the fourth inductor L g The other end is connected to the seventh diode D 7 negative end of

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