Staggered and parallel soft switch Buck converter

Abstract

A staggered and parallel soft switch Buck converter comprises two synchronous rectification Buck circuits, a driving control circuit and an auxiliary zero-voltage circuit, wherein the auxiliary zero-voltage circuit is connected in series with a capacitor by an auxiliary inductor, the driving control circuit is used for acquiring an output voltage Vo and generating a feedback voltage signal, the driving control circuit outputs a first driving signal, a first complementary driving signal, a second driving signal and a second complementary driving signal, the first driving signal is complement tothe first complementary driving signal and is used for controlling the first synchronous rectification Buck circuit, the second driving signal is complement to the second complementary driving signaland is used for controlling a second synchronous rectification Buck circuit, the first synchronous rectification Buck circuit and the second synchronous rectification Buck circuit are conducted in astaggered way, power is continuously supplied to a subsequent load, and a zero-voltage switch current required by the zero-voltage switch is obtained according to node potential difference formed by working of the two Buck circuits in a staggered way. The staggered and parallel soft switch Buck converter is simple to control, and zero-voltage conduction of all switch tubes also can be achieved under the condition that circuit parameters are not consistent.

Description

technical field [0001] The invention relates to power electronic circuits, in particular to an interleaved parallel soft-switching Buck converter circuit. Background technique [0002] figure 1 00 is a basic Buck converter circuit, 01 is a chopper switch, 02 is an energy storage inductor, 03 is a freewheeling diode, 04 is a filter capacitor, 05 is a load, and 06 is a drive control circuit. When the main switch tube 01 When entering the conduction state under the action of the control circuit 06, one end of the inductor 02 is positively connected to the power supply through the main switch tube 01, and the other end of the inductor 02 is positively connected to the output, so the difference between the input voltage Vin and the output voltage Vo value will cause the current in inductor 02 to rise. At the same time, during the on-time of the main switch 01 , the rectifier diode 03 is reverse-biased and is in a cut-off state, and the output filter capacitor 04 and the inducto...

AI Technical Summary

Problems solved by technology

[0003] In view of this, the present invention proposes a new interleaved parallel soft-switching Buck converter circuit to solve the problem of excessive switching loss and EMI in high-frequency operation, and at the same time solve the problem of auxiliary inductor bias. This solution does not require the duty cycle D , in the case of D05, ZVS of all switching tubes can be realized, that is, zero voltage switching, and the control is simple

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