CPC H02M 3/33584 (2013.01) [H02J 7/007 (2013.01); H02M 1/0009 (2021.05); B60L 53/20 (2019.02); B60L 2210/10 (2013.01); H02J 2207/20 (2020.01); H02M 1/44 (2013.01)] | 15 Claims |
1. A bidirectional insulating DC-DC converter comprising:
a first battery and a second battery, a discharge voltage of the first battery being relatively higher than that of the second battery;
a step-down circuit configured to step down a voltage applied from the first battery and output the stepped-down voltage to the second battery; and
a step-up circuit connected in parallel to the step-down circuit and configured to step up a voltage applied from the second battery and output the stepped-up voltage to the first battery,
wherein the step-down circuit includes an active clamp forward converter circuit, and the step-up circuit includes an active clamp flyback converter circuit, and
wherein the step-down circuit comprises:
a current transformer configured to convert a current value into a voltage and detect the current value for current control of a first voltage stage which is an input part of the step-down circuit;
a semiconductor switch element in the first voltage stage configured to alternately switch the voltage of the first battery so as to perform a function of the active clamp forward converter;
a transformer configured to step down the voltage switched by the semiconductor switch element in the first voltage stage, transfer the stepped-down voltage to a second voltage stage, and electrically insulate the first voltage stage from the second voltage stage; and
semiconductor switch elements in the second voltage stage configured to rectify a voltage output from the transformer.
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