CONTROL METHOD FOR POWER SUPPLY

A control method for a power supply, in which a link capacitor is connected between an external load and a power relay assembly (PRA) that includes a precharge resistor to control a power flow between a battery and the external load, the control method including: initiating precharge; after the initiating of the precharge, measuring voltages of the link capacitor by measuring a first voltage V of the link capacitor at a first time T, measuring a second voltage V of the link capacitor at a second time T, and measuring a third voltage V of the link capacitor at a third time T, the first time T, the second time T, and the third time T each being different times; calculating a capacitance C of the link capacitor using the first voltage V, the second voltage V, and the third voltage V; and terminating the precharge.