PURPOSE: To prevent such possibility that many parts are damaged successively by interrupting all outputs when an output is at an excessive voltage level.
CONSTITUTION: When the load of each voltage output somehow develops voltage abnormality, each excessive voltage detecting circuit detects an excessive voltage, and each Zener diode generates an excessive voltage signal (high level voltage). The gate of an SCR 8 is triggered and an voltage output A is shorted. As a result, the voltage output A stops the oscillation of a switching element 3 under the control of a feedback circuit, and comes not to output an intermittent signal. Therefore, all the voltage outputs A to C are instantaneously turned off. The above-mentioned actions are carried out in a very short time. Thus, such possibility can be eliminated that terminal parts such as a capacitor and IC are damaged.
KOSEKI YASUFUMI
ASAKAWA MINORU
