Ignition control apparatus for internal combustion engine

An ignition control apparatus, which controls a flow of a coil current through an ignition coil of an internal combustion engine, comprising:

• a switching circuit including;
• a first switching device switching a main current constituting the most portion of the coil current,
• a second switching device switching a sensing current constituting the coil current together with the main current, and
• a temperature sensor detecting a temperature of the first switching device and a temperature of the second switching device, and
• a control circuit heat-isolated from the switching circuit and including;
• a current limiting circuit operating the first switching device and the second switching device to adjust the coil current to a predetermined value based on the sensing current, and
• a thermal shutoff circuit turning off both the first switching device and the second switching device when the temperature detected by the temperature sensor exceeds a predetermined threshold value.