Active clamping stagger parallel connection DC/DC converter having switch capacitor

Abstract

The invention discloses an active clamping interlaced parallel DC / DC convertor provided with switch capacitors, which comprises two power switch tubes, two output diodes, two clamping diodes, an auxiliary power switch tube, an clamping capacitor, two switch capacitors, an output capacitor and two coupling inductors provided with two windings respectively. By using the second windings of the two coupling inductors and the two switch capacitors, the invention realizes the improvement of the voltage gain of the convertor. By using the auxiliary switch tube and the clamping capacitor to absorb the leakage inductance energy of the two coupling inductors, and using the own parallel capacitors of the two power switch tubes and the gate pole arrangements of the two power switch tubes and the auxiliary switch tube, the convertor realizes the zero voltage turn-on and the zero voltage turn-off of the two power switch tubes and the auxiliary switch tube; and by using the leakage inductances of the two coupling inductors, the convertor realizes the soft turn-off of the two output diodes and the two clamping diodes, and can improve the output gain and circuit efficiency of the convertor withoutenergy loss components in the circuit.

Description

technical field [0001] The invention relates to a DC-DC converter, in particular to an active clamp interleaved parallel DC / DC converter with switched capacitors. 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 reco...

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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