| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a protection circuit of simple constitution which can protect a circuit without fail even in case that a DC current of reverse polarity is applied, in a power supply circuit. <P>SOLUTION: In a power supply circuit which is equipped with a power supply line for supplying DC power and a first switch element 3 which is provided on the power supply line so as to intermit the power supply line and is switched on by voltage, which has a potential difference at a specified value or over from the voltage of the first terminal connected to the power supply source side of DC power, being applied to the second terminal, there are provided with a connection path, which connects the first and second terminals with each other, and a second switch element 81, which is arranged on this connection path so as to intermit this connection path and is switched on by DC power of reverse polarity being applied to the power supply line. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
