| 摘要 |
PROBLEM TO BE SOLVED: To preserve a direct-current power circuit, such as a DC-DC converter, from a rush current. SOLUTION: A FET switch 3 is installed between a direct-current power supply 1 and a DC-DC converter 11, which is a direct-current power circuit. The FET switch 3 is set such that it is turned on after a certain time delay, when a power switch 5 is turned on. A resistor 40 is installed in parallel with the FET switch 3. In addition, a transistor 7 that commands to turn on or off the direct-current power circuit 11 is installed. A comparator 12 and a peak- hold circuit 13 that use as an input the voltage across the resistor 40 are installed. When the FET switch 3 is broken, the comparator 12 and the peak- hold circuit 13 function to turn off the transistor 7, thus forcedly turning off the DC-DC converter 11 as the direct-current power circuit.
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