| 摘要 |
PROBLEM TO BE SOLVED: To improve the operational reliability of a device by turning on a switch, when the on-board power source of another unit malfunctions, turning on the switch after a prescribed delay time when its own unit malfunctions, or turning off the switch when its own unit short-circuits. SOLUTION: When only an input signal Ai is active in a prescribed one of a plurality of unit 1-n, power is supplied to the defective unit by turning on a switch 1-i, because the power supply circuit of the unit is defective. When input signal A-i and B-i are active and an input signal C-i is inactive, the switch 1-i is turned on after a prescribed delay time, because the power supply circuit 3-i of its own unit is detective. When the input signal C-i is active, the switch 1-i is turned off, because the functional circuit 5-i of its own unit is short- circuited. Therefore, the operational reliability of a device can be improved by breaking the power supply to the functional circuit section and making stable state the qualities of supplied power to the unit, where no short circuit occurs when an on-board power source becomes malfunctioned. |
