| 摘要 |
A protection circuit 10 provided with a current regulating section 14 with a first end connected to a power source line VDD and a second end connected to an input terminal 116A of an inverter 116. The current regulating section 14 applies a voltage of less than a threshold value voltage to the input terminal 116A when a surge current having predetermined frequency characteristics flows from the first end in a particular flow path, by generating induced electromotive force so as to generate a magnetic field to cancel out the magnetic field occurring due to the surge current, thereby impeding flow of the surge current. The current regulating section 14 applies a voltage of the threshold value voltage or greater to the input terminal 116A when a driving current not having the frequency characteristics flows in from the first end.
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