| 摘要 |
PROBLEM TO BE SOLVED: To prevent heating or breakage of a transistor by preventing the input of voltage extremely lower than the rated voltage to a self-excited power circuit. SOLUTION: In a self-excited power circuit, which obtains desired output voltage by supplying the primary coil of a transformer with input voltage and turning on or turning off the switching means provided on this primary side, according to the output voltage generated on the secondary coil side of the transformer, low-input voltage preventing, circuits Q2, r7, r4, ZD2, which prevent the on/off control of the above switching means when the above input voltage is smaller than the prescribed voltage, are provided.
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