| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power supply circuit solving the problem that a stable supply operation of output voltage cannot be maintained for long time when abnormality such as instantaneous drop and instantaneous interruption of input voltage occurs, and to provide a control method of the power supply circuit and electronic equipment having the power supply circuit. Ž<P>SOLUTION: The power supply circuit includes a transformer converting input voltage into output voltage and an input circuit part which supplies input voltage to the transformer when input voltage is in a prescribed voltage range, charges voltage higher than input voltage based on energy which excites and magnetically resets the transformer and supplies voltage based on charged charge voltage to the transformer as input voltage when input voltage is out of the voltage range. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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