Patent ID: 9696380
Date: 2017-07-04
CPC Classifications: G01R,H01M,Y02E

Claim:
1. A relay control system comprising: a battery pack comprising a positive terminal and a negative terminal; a first main relay comprising both terminals connected between the positive terminal of the battery pack and a first node which is one end of a load; a second main relay comprising both terminals connected between the negative terminal of the battery pack and a second node which is the other end of the load; a first pre-charge unit connected to the second main relay in parallel and comprising a series circuit configured with a first pre-charge resistor and a first pre-charge relay; a second pre-charge unit connected to the first main relay in parallel and comprising a series circuit configured with a second pre-charge resistor and a second pre-charge relay; and an operational amplifier having both terminals connected to the first and second nodes and outputting a voltage applied to the load to an output terminal, wherein, prior to a pre-charging period before at least one of the first and second main relays is turned on, the first pre-charge relay is turned on and whether the first main relay and the second pre-charge relay are fused is determined according to a voltage value output from the operational amplifier, or the second pre-charge relay is turned on and whether the second main relay and the first pre-charge relay are fused is determined according to a voltage value output from the operational amplifier.