| 摘要 |
A series type d.c. power source circuit having a comparator for comparing a voltage detected by a current detector with a reference voltage and generating an overcurrent detection signal; and a controller connected in series with a power source line for controlling a d.c. output and executing an overcurrent protection operation, wherein one of a d.c. output division voltage and an output voltage and an oscillator circuit is mainly used as the reference voltage of the comparator, and the output voltage of the oscillator circuit is used during the overcurrent protection operation.
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