| 摘要 |
A voltage regulator circuit for an AC generator is disclosed which comprises a holding circuit for holding the power transistor, which is coupled in series with the field winding of the generator, in the non-conductive state after the Zener diode of the voltage detecting circuit is turned off, and a releasing circuit for releasing the holding action of the holding circuit periodically at a predetermined interval. The holding circuit includes a pair of transistors turned on and off in phase and in antiphase with the power transistor, respectively, the transistor in antiphase, when conductive, holding the power transistor in the non-conductive state. The releasing circuit, on the other hand, includes a pulse generator for generating trigger pulses periodically at a predetermined interval, and a transistor which is turned on by these trigger pulses to turn off the transistor in antiphase holding the power transistor in the non-conductive state. The interruption frequency of the excitation current, i.e., the frequency of turning on and off of the power transistor, is equal to the frequency of releasing actions of the releasing circuit occurring at said predetermined interval.
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