Abstract: A DC-to-DC converter includes a first switching circuit, a second switching circuit, a transformer positioned between an AC side of the first switching circuit and an AC side of the second switching circuit, an inductance element positioned between the transformer and at least one of the AC side of the first switching circuit and the AC side of the second switching circuit, and control circuitry that operates the first switching circuit and the second switching circuit. The control circuitry sets a predetermined operation ratio of the first switching circuit and the second switching circuit to each other, and adjusts, based on the predetermined operation ratio, a first operation period of the first switching circuit and a second operation period of the second switching circuit.

Abstract: A power converting device includes power conversion circuitry connected to a power system, voltage amplitude determination circuitry that determines a voltage amplitude of the power system, and control circuitry that controls an output current from the power conversion circuitry to the power system based on an oscillation component of the voltage amplitude determined by the voltage amplitude determination circuitry.