A kind of arcp soft switch circuit

Abstract

The invention discloses a ARCP soft switch circuit, including a main power half-bridge contravariant circuit and a filter circuit cascaded in sequence, wherein the main power half-bridge contravariant circuit including a positive-negative DC power supply, a first main power switch device and a second main power switch device arranged in sequence; the filtering circuit including a filtering inductance and a filtering capacitance arranged in sequence; an auxiliary switch set and a resonance inductance being in series between the power supply earth and the filtering circuit, and the auxiliary switch set including a unidirection first auxiliary switch device and a second unidirection auxiliary switch device paralleled with each other; the resonance inductance being the resonance inductance of the soft magnetic core. Be means of using the resonance inductance of a soft magnetic core with worse linearity, namely the magnetic conductivity varying more appreciable along the variation of DC offset, the invention enlarges the range for opening the zero-voltage of an ARCP soft switch circuit to implement completely soft switch for any output current, and improves operation characteristic of the ARCP soft switch circuit and complete machine efficiency and reliability.

Description

technical field [0001] The invention relates to a switch circuit, in particular to an ARCP soft switch circuit. Background technique [0002] The current development trend of switching power supply is: high frequency miniaturization, high power density, high efficiency, and low cost. However, due to the fact that the semiconductor device is in a hard switching state, the traditional switching circuit has a very large loss and cannot improve its own efficiency, so that it is bulky and gradually loses its market competitiveness. Due to the limitations of the development of the semiconductor device industry and price factors, soft-switching circuit topology has become the choice of most switching power supply manufacturers to improve product competitiveness. There have been many studies on soft-switching circuits. Pole (Auxiliary Resonant Commutated Pole, referred to as ARCP) soft switching circuit, the circuit is simple and widely used, the specific structure is as follows f...

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Problems solved by technology

[0008] However, there is an obvious defect in this circuit, that is, the main power switching device can only be used as the main power filter current I 1 equal to the full resonance current value I n , I n =[T d -π×(2×L 2 ×C 1 ) 0.5 ]×U d ÷ L 2 Complete zero voltage turn-on can be achieved only when the main power filter current I 1 greater than or less than I n When , the switching device can only achieve incomplete zero-voltage turn-on, which can be divided into three situations:

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