| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that output voltage exceeds a set value to a large extent when large voltage is applied to a constant-voltage power source from the outside. SOLUTION: In this constant-voltage power source 1 to output constant voltage from an output terminal 8, means 15 to 20 to lower output impedance by detecting inversion of a flowing direction of a current when voltage larger than the output voltage is inversely applied to the output terminal 8 from the outside are provided and the output voltage is controlled as constant even when the voltage larger than the constant voltage is inversely applied on the output terminal 8 from the outside.
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