Protection control device and current control method using same

A protection control device for protecting a power electrical component electrically connected to a battery from over-temperature, the protection control device comprising:

• a reference temperature acquisition unit configured to acquire temperature measured with respect to a first component to which heat generated in the power electrical component due to current flowing through the power electrical component is transferred, as a reference temperature, the first component being the battery;
• a first temperature estimation unit configured to estimate temperature of the power electrical component as protection target component temperature;
• and
• a current control unit configured to control current flowing through the power electrical component, based on the estimated protection target component temperature,
• wherein the first temperature estimation unit estimates the protection target component temperature, based on an accumulated value of a temporal temperature change amount of a difference between an amount of heat generation of the power electrical component, the amount of heat generation being calculated based on the current and an amount of heat dissipation of the power electrical component, the amount of heat dissipation being calculated based on the reference temperature, in accordance with a first temperature estimation function.