| 摘要 |
PURPOSE:To enable to continue the generation of a constant voltage even when a normal feedback signal is failed by leading a sub feedback signal separately from a normal feedback signal from the output of a generator by a control power source. CONSTITUTION:When a generator is in a normal operation state and the output voltage of the generator is fed back, a Zener diode ZD is excited, and a transistor Q1 is turned. ON. Accordingly, a sub feedback signal from a control power source is grounded, and the normal feedback voltage is inputted to a comparison amplifier 9. When the voltage feedback signal is failed due to certain defect, the conduction of the diode ZD is interrupted, and the transistor Q1 is switched from ON to OFF. As a result, the sub feedback signal from the control power source 8 is inputted to the amplifier 9.
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