DISPOSITIF DE CONVERSION DE PUISSANCE DIRECTE ET PROCÉDÉ POUR COMMANDER UN DISPOSITIF DE CONVERSION DE PUISSANCE DIRECTE

摘要

The present invention is a direct power conversion device capable of preventing an unnecessary increase in voltage across a capacitor that forms a filter even when the capacitor is provided on the output side of a rectifier. A first capacitor (C3) is provided between a first power supply line (LH) and a second power supply line (LL). A charge/discharge circuit (4) includes a second capacitor (C4) provided between the first power supply line (LH) and the second power supply line (LL) and a first switch (Sc) connected in series to the second capacitor (C4) on the side of the first power supply line (LH). A booster circuit (4b) boosts the rectified voltage from a diode rectifier (2) to charge the second capacitor (C4). A current blocking part (4c) is provided on the first power supply line (LH) or the second power supply line (LL) between the first capacitor (C3) and the second capacitor (C4) and blocks flowing of the current from the second capacitor (C4) to the first capacitor (C3).