POWER CONVERSION DEVICE

To provide a power conversion device which can suppress power consumption of a transformation circuit in charging of a battery.SOLUTION: A power conversion device 20 is applied to a power supply system 100 comprising a main battery 11 and an auxiliary machine battery 17 with rated voltage different from that of the main battery 11, and comprises: a charger 30 which converts AC power to be input from an AC power supply 200 into DC power, and charges the main battery 11 with the DC power; a first DDC 40 which transforms power supply voltage of the main battery 11 to be output to the auxiliary machine battery 17; and a blocking part which can block supply of the DC power to the first DDC 40 in charging of the main battery 11 by the charger 30.SELECTED DRAWING: Figure 1 【課題】バッテリの充電時における変圧回路の電力消費を抑制できる電力変換装置を提供すること。【解決手段】メインバッテリ１１と、メインバッテリ１１と定格電圧が異なる補機バッテリ１７とを含む電源システム１００に適用される電力変換装置２０であって、交流電源２００から入力される交流電力を直流電力に変換し、この直流電力でメインバッテリ１１を充電する充電器３０と、メインバッテリ１１の電源電圧を変圧して補機バッテリ１７に出力する第１ＤＤＣ４０と、充電器３０によるメインバッテリ１１の充電時に、直流電力が第１ＤＤＣ４０に供給されることを遮断可能な遮断部と、を備える。【選択図】 図１