Patent ID: 9450502
Filing Date: 2016-09-20
CPC Classification: H02M,Y02B

Claim Text:
1. A direct power conversion device, comprising: a first power supply line; a second power supply line applied with a potential lower than that of said first power supply line; a diode rectifier which has an input side connected with a single-phase AC power supply and an output side connected with said first power supply line and said second power supply line, and performs a single-phase full-wave rectification; a first capacitor provided between said first power supply line and said second power supply line; a charge/discharge circuit provided between said first power supply line and said second power supply line on a side opposite to said diode rectifier with respect to said first capacitor; and an inverter inputted with a DC voltage as a voltage between said first power supply line and said second power supply line, wherein said charge/discharge circuit has a buffer circuit including a second capacitor provided between said first power supply line and said second power supply line and a first switch connected in series to said second capacitor on a side of said first power supply line between said first power supply line and said second power supply line, a booster circuit which boosts a rectified voltage from said diode rectifier to charge said second capacitor, and a current blocking part provided on said first power supply line or said second power supply line between said first capacitor and said second capacitor and blocks flowing of a current from said second capacitor to said first capacitor.