| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem where, in a system that needs a battery to be charged, the incorporation of a charger adds to the volume and weight of the system.SOLUTION: A charger includes a three-phase inverter circuit, a battery for supplying a DC current, a first smoothing capacitor for smoothing the DC current, and a step-up/down converter circuit. The step-up/down converter circuit is so configured that an input of a step-up converter is connected to an output of a step-down converter. An input of the step-down converter of the step-up/down converter circuit can be connected to a commercial power supply through a rectification circuit. One end of an output of the step-up converter of the step-up/down converter circuit is connected to an output of any one of three phases of the three-phase inverter circuit, and the other end of the output of the step-up converter of the step-up/down converter circuit is connected to an input of the three-phase inverter circuit. A second smoothing capacitor used in the step-up converter is the first smoothing capacitor shared. |
