| 摘要 |
PURPOSE:To detect the state of a load and to put the circuit in its original state automatically after load abnormality is removed by detecting the load abnormality and restarting intermittently electric power supply which is interrupted temporarily. CONSTITUTION:If one of load circuits Z1-Zn becomes abnormal and its terminal voltage drops below a reference value, this is detected by a comparator 4 to start a timer circuit 6 through an NAND circuit 5, and a stabilizing circuit is turned on only in a short pulse period T to supply electric power to a load and also check voltages of the load circuits simultaneously; when the terminal voltage still drops below the reference voltage, the supply to the load is cut off again. When the abnormality disappears during the short pulse period, the timer circuit 6 and a control circuit stop operating and electric power is supplied to the load continuously without turning off the stabilizing circuit. |
