Power supply control apparatus

A power supply control apparatus including a power supply control unit that, by turning a switch provided on an electrical wire on/off, controls power supplied via the electrical wire, and a calculation unit that calculates a temperature difference between an ambient temperature of the electrical wire and an electrical wire temperature in time series, based on a value of current flowing through the electrical wire,

• the calculation unit being configured to calculate the temperature difference based on a previous temperature difference calculated previously and the value of the current, and to suspend time-series calculation of the temperature difference in a state in which the power supply control unit has turned the switch off,
• the apparatus comprising:
• a clocking unit that clocks elapsed time from suspension to resumption of the calculation by the calculation unit;
• and
• a setting unit that, in the case where the calculation is resumed by the calculation unit, sets an initial temperature difference to be used as the previous temperature difference in an initial calculation after resumption, based on the elapsed time clocked by the clocking unit, and
• the calculation unit being configured to suspend the calculation in a case where the calculated temperature difference is less than a predetermined temperature difference.