Patent ID: 11949326
Assignee: MITSUBA CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A power supply device, comprising:
a capacitor, connected in series with a contactor that is connected between an inverter driving a motor and a battery and that switches on or off power supply from the battery to the inverter, and connected in parallel with the inverter;
a pre-charge circuit pre-charging the capacitor, connected in parallel with the contactor and configured to comprise a pre-charge resistor that supplies a pre-charge current to the capacitor; and
a control circuit, controlling the pre-charge circuit and the contactor, wherein
the control circuit comprises a sensor that measures a voltage of the battery and a voltage of the capacitor, and, after determining whether the voltage of the capacitor is less than a voltage value obtained by adding a predetermined voltage value to the voltage of the battery, determines whether the pre-charge is necessary according to whether a ratio of the voltage of the capacitor to the voltage of the battery is equal to or less than a target value.