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

Claim 1:
2. The power supply device according to claim 1, wherein
the control circuit comprises a storage part and a counter, and, if determining that the pre-charge is necessary, controls the storage part to store the voltage of the capacitor as a capacitor voltage initial value and store the voltage of the battery as a battery voltage initial value, and controls the counter to measure a predetermined time during which a maximum load continues on the pre-charge resistor and a pre-charge period during which the pre-charge current is supplied to the capacitor after start of the pre-charge;
whether the voltage of the capacitor at a moment when the predetermined time has elapsed after the start of the pre-charge period is equal to or greater than a threshold obtained by multiplying a predicated value of the voltage of the capacitor by a tolerance, the predicated value being expressed by (the battery voltage initial value—the capacitor voltage initial value)×natural logarithm (—the predetermined time / capacitance value of the capacitor×resistance value of the pre-charge resistor)+the battery voltage initial value.