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A stable power supply device for a high voltage battery system in a vehicle enables the voltage of a capacitor in a high voltage component to be gradually increased at an initial stage of ignition, using a heat generating resistor of a temperature raising system mounted to raise the temperature of a

A stable power supply device for a high voltage battery system in a vehicle enables the voltage of a capacitor in a high voltage component to be gradually increased at an initial stage of ignition, using a heat generating resistor of a temperature raising system mounted to raise the temperature of a battery in the vehicle. Further, the stable power supply device enables a capacitor in a high voltage component to be discharged using a heat generating resistor of a temperature raising system after the ignition of the vehicle is off, thereby ensuring the stability of the system.

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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 fi

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; anda 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; anda 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, andwherein 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. 2. The stable power supply device of claim 1, wherein the power relay assembly has a temperature raising fuse installed between the second main relay and the temperature raising relay to cut off a flow of overcurrent. 3. The stable power supply device of claim 1, wherein the heat generating resistor portion is configured with a plurality of heat generating resistors connected in series to one another. 4. The stable power supply device of claim 3, wherein each of the plurality of heat generating resistors is disposed in each battery module constituting the high voltage battery. 5. The stable power supply device of claim 3, wherein each of the heat generating resistors is a positive temperature coefficient (PTC) resistor. 6. The stable power supply device of claim 3, wherein each of the heat generating resistors is disposed to surround each battery module constituting the high voltage battery, thereby performing a heating function of a temperature raising heater. 7. The stable power supply device of claim 1, wherein the control unit performs precharging of the capacitor in the high voltage component by operating only the precharge relay and the second main relay among the relays constituting the power relay assembly at the initial stage of ignition. 8. The stable power supply device of claim 7, wherein the control unit removes a resistive element and allows power to be supplied to the high voltage component by operating only the first and second main relays among the relays constituting the power relay assembly after the precharging of the capacitor in the high voltage component is completed. 9. The stable power supply device of claim 1, wherein the control unit allows remaining power of the capacitor in the high voltage component to be consumed through the heat generating resistor portion by operating only the precharge relay and the temperature raising relay among the relays constituting the power relay assembly after ignition of the vehicle is off. 10. The stable power supply device of claim 1, wherein the heat generating resistor portion is connected to the high voltage battery through the first branch circuit. 11. The stable power supply device of claim 1, wherein the precharge heat generating resistor is disposed together with the heat generating resistor portion to surround a battery module of the high voltage battery, thereby performing the heating function as a heater for raising the temperature of the battery. 12. 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 connection between the high voltage battery and the power relay assembly to be connected to a second connection 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; anda 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;a second main relay connected to a negative electrode terminal of the high voltage battery;a precharge relay connected between the first main relay and the heat generating resistor portion; anda temperature raising relay connected between the second main relay and the heat generating resistor portion,wherein the heat generating resistor portion is connected to a circuit between the precharge heat generating resistor and the precharge relay.