Patent ID: 8304125

Claim:
A power system disposed in a vehicle, comprising: a power supply unit; a first voltage boost unit configured to have one side connected to the power supply unit and the other side connected to an electric motor for driving the vehicle, and to boost an output voltage from the power supply unit and supply power with the boosted output voltage to the electric motor; a second voltage boost unit configured to have one side connected to the other side of the first voltage boost unit in parallel with the electric motor, and to further boost the output voltage boosted by the first voltage boost unit; an electric accumulator connected to the other side of the second voltage boost unit; a first power supply portion which is connected to one side of the first voltage boost unit in parallel with the power supply unit and capable of supplying power to the outside; a first temperature sensor configured to measure a temperature of the power supply unit; and a power supply controlling unit configured to: calculate an amount of power, wherein the calculated amount of power corresponds to a power needed to heat the power supply unit equal to or greater than a temperature threshold when the temperature of the power supply unit measured by the first temperature sensor drops lower than the temperature threshold, set a first discharge threshold, wherein the first discharge threshold corresponds to an addition of the calculated amount of power to a discharge threshold of the electric accumulator, and control the power supply from the power supply unit and the electric accumulator to the first power supply portion to be greater than the first discharge threshold.