Control apparatus

A control apparatus comprising:

• an H-bridge circuit including
• a high potential node having a predetermined potential,
• a low potential node having a potential lower than the high potential node,
• a first switch located between the high potential node and the low potential node,
• a second switch located between the first switch and the low potential node,
• a third switch located between the high potential node and the low potential node, and
• a fourth switch located between the third switch and the low potential node;
• a wire connected to an electrical load in series between a first common connection terminal and a second common connection terminal, the first common connection terminal being a terminal to which the first switch and the second switch are commonly connected, the second common connection terminal being a terminal to which the third switch and the fourth switch are commonly connected;
• and
• a control circuit configured to
• execute a first operation in which the first switch and the fourth switch are turned on to pass a first current from the high potential node to the low potential node through the first switch, the electrical load, and the fourth switch,
• execute a second operation in which the second switch and the third switch are turned on to pass a second current from the high potential node to the low potential node through the third switch, the electrical load, and the second switch,
• calculate a first temperature rise amount of the wire based on the first current, the first temperature rise amount corresponding to a temperature rise of the wire in conjunction with the first operation,
• calculate a second temperature rise amount of the wire based on the second current, the second temperature rise amount corresponding to a temperature rise of the wire in conjunction with the second operation, and
• calculate a temperature of the wire based on the first temperature rise amount and the second temperature rise amount.