Patent ID: 9738164
Date: 2017-08-22
CPC Classifications: B60L,Y02T

Claim:
1. A stable power supply device for a high voltage battery system in a vehicle, the stable power supply device comprising: a heat generating resistor portion connected to a high voltage battery through a power relay assembly constituted of two or more relays; a first branch circuit branched from a first wire between the high voltage battery and the power relay assembly to be connected to a second wire between the heat generating resistor portion and the power relay assembly; a precharge heat generating resistor installed in the first branch circuit, the precharge heat generating resistor preventing a sudden flow of current by delaying an increase in voltage at an initial stage of ignition; a high voltage component installed in a second branch circuit branched from an internal circuit of the power relay assembly, the high voltage component having a capacitor connected to the internal circuit of the power relay assembly; and a control unit connected to the power relay assembly to control an operation of each relay constituting the power relay assembly, wherein the power relay assembly includes: a first main relay connected to a positive electrode terminal of the high voltage battery, the first main relay controlling a power supply of the battery; a second main relay connected to a negative electrode terminal of the high voltage battery, the second main relay controlling the power supply of the battery; a precharge relay connected between the first main relay and the heat generating resistor portion, the precharge relay operating at the initial stage of ignition to prevent a sudden flow of current; and a temperature raising relay connected between the second main relay and the heat generating resistor portion, the temperature raising relay operating after ignition of the vehicle is off to induce the capacitor in the high voltage component to be discharged, and wherein one terminal of the second branch circuit is connected to a first connection between the first main relay and the precharge relay and the other terminal of the second branch circuit is connected to a second connection between the second main relay and the temperature raising relay.