POWER SUPPLY CHARGER AND POWER SUPPLY CHARGING METHOD

摘要

A charger for charging a power converter with a reduced power consumption. A power supply (1) comprises a diode bridge (11) for rectifying an AC voltage from an AC power supply (E1) and a smoothing capacitor (13) for smoothing the DC voltage from the diode bridge (11). A charger (2) comprises a current-limiting capacitor (22) connected between the AC power supply (E1) and the power supply (1) and a switch section (21) for selecting either connection of the AC power supply (E1) to the diode bridge (11) through the current-limiting capacitor (22) or connection of the AC power supply (E1) to the diode bridge (11) by bypassing the current-limiting capacitor (22). A switch control section (3) controls the switch section (21) and charges the smoothing capacitor (13) through the current-limiting capacitor (22). Since the current-limiting capacitor (22) does not consume power except power consumption by the equivalent DC resistor, the power consumption is smaller than that of when the smoothing capacitor is charged through the current-limiting resistor.