Ignition system of internal combustion engine

摘要

An ignition circuit is formed in one chip comprising an insulated gate bipolar transistor (2) for controlling the flow of a primary current, a current limiting circuit (4) for limiting the current flowing into the transistor (2), and a thermal shut-off circuit (5) capable of forcibly shutting off the primary current in case of a trouble. In the ignition circuit (11) a power supply GND terminal (10) and an ignition control signal positive terminal (8) are divided.