Active clamping stagger parallel connection voltage boosting-type converter

Abstract

The invention discloses an interleaving active-clamping boosting converter which comprises two power switching tubes, two fly-wheel diodes, an auxiliary power switching tube, a clamping capacitor, an output capacitor and two coupled inductors, each provided with three windings. The boosting converter makes use of the third windings of the two coupled inductors to realize voltage gain of the converter, and employs a circuit constituted by the auxiliary power switching tube and the clamping capacitor which are connected in series to totally absorb and transfer the leakage inductance energy of the two coupled inductors and to realize no-voltage conduction on the two power switching tubes; no-voltage shutoff on the two power switching tubes is realized through the parallel capacitors of the two power switching tubes; the boosting converter realizes no-voltage conduction and no-voltage shutoff on the auxiliary power switching tube through the gate arrangement of the two power switching tubes and the auxiliary power switching tube. The boosting converter is simple in structure and has fewer assistant elements and no energy-consuming elements, which can improve the output gain of the converter and the efficiency of the circuit.

Description

technical field [0001] The invention relates to a DC-DC converter, in particular to an active clamp interleaved parallel boost converter. Background technique [0002] A conventional step-up (Boost) interleaved parallel DC-DC converter includes two inductors, two freewheeling diodes, two power switch tubes, the drain of the first power switch tube and the anode of the first diode and One end of the first inductance is connected, the drain of the second power switch tube is connected with the anode of the second diode and one end of the second inductance, and the other end of the first inductance is connected with the other end of the second inductance. The output voltage gain of this step-up interleaved parallel DC-DC converter is small, the voltage stress of the power switch tube is large, the power switch tube works as a hard switch, the switching loss is large, and the reverse recovery current of the freewheeling diode is large , the reverse recovery loss is large. In r...

AI Technical Summary

Problems solved by technology

Although these two methods can realize the soft switching of the power switch tube, the external circuit is complicated, and the voltage stress of the power switch tube cannot be reduced, and the high gain function of the converter cannot be realized.

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