| 摘要 |
PURPOSE:To promote the improvement of economical efficiency and reliability of a power supply circuit, by providing a power supply, which feeds power to a microprocessor, and a switching means, which disconnects the power when an engine is started, in the case of a power supply control circuit in an automobile. CONSTITUTION:An ignition switch 2 is placed in a position of start in an automobile when its engine is started, and voltage of a battery 1 is supplied to terminals IG, ST, R through a terminal B, actuating a starter motor. The driver, if he finishes to start the engine, turns the ignition switch 2 to an on-position. Then the voltage is supplied to a microprocessor 4 through a regulated power supply 3 by connecting a terminal ACC to the battery 1. In this way, any necessity for using a complicated additional circuit is eliminated because the ignition switch disconnects the power supply to the microprocessor 4 and releases it from disconnection. |
