DC POWER CONVERSION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a DC power conversion device capable of reducing a loss while satisfying a condition of soft switching by a simple calculation.

SOLUTION: A DC power conversion device has: a single-phase bridge circuit comprising a switching element connected to a primary side of a transformer via an inductor; and control means performing zero-voltage switching of the switching element by PWM control of a phase shift system. The control means has: mode selection means selecting a first mode or a second mode; switching pattern calculation means calculating an optimum zero-voltage section and an optimum phase shift amount that satisfy a conditional expression (7) when the first mode is selected and satisfy a conditional expression (9) when the second mode is selected; and PWM signal generation means generating a PWM signal for performing phase shift PWM control of the switching element based on the calculation results of the optimum zero-voltage section and the optimum phase shift amount.

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