| 摘要 |
<p>PURPOSE:To reduce the power consumption of a control circuit containing a relay contact by securing a low power mode with application of the 2nd constant voltage circuit at each part excluding a central processing unit and a read/write memory to deliver and cut off the constant voltage. CONSTITUTION:A battery power supply 12 of an automobile is connected to a voltage controller 13 of an electronic controller 11. Thus a current controlled to a fixed level of voltage is always supplied to a central processing unit CPU15 and a read/write memory RAM16 via the 1st constant voltage circuit 17. The CPU15 contains an interruption terminal (b), an input terminal (c) for low power mode and an output terminal (i) in addition to a power supply terminal (a). While the RAM16 contains an input terminal (e) for low power mode and is connected with a low power circuit 27. Furthermore a ROM31, an input/output device 32, an A/D converter 33, etc. are connected to the 2nd constant voltage circuit 30 branched out of the circuit 17. Then the circuit 30 is connected to a control circuit 35 having a contact 34 of a relay 23. Thus the CPU15 turns off the relay 23 when a main switch 18 is kept off. Then a low power mode is secured with an electronic controller.</p> |
