| 摘要 |
PURPOSE:To assure stable working of a load controller, by stopping the driving of the load in the case of a dangerous state where a commercial power supply has a service interruption or a voltage drop less than the working assurance level of the load. CONSTITUTION:A signal is immediately fed to a microcomputer 18 even if a commercial power supply 2 has a voltage drop by some reason down to a level less than the working assurance voltage of an AC magnet 16 serving as a load 5 since a voltage comparator 21 monitors the voltage of a non-stabilized DC power supply 1 which works approximately in accordance with the voltage of the power supply 2. The signal supplied to the computer 18 drives a rectifying element 17 for control of the bilateral three-terminal to discontinue the power conduction to the magnet 16 to prevent a dangerous state. In addition, the consumption is reduced for the power supply 1 and a DC stabilized power supply 3 since no load exists. Thus the tolerance is increased to an instant service interruption to assure stable working of a load controller. |
