| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power supply circuit capable of executing a protection operation for only original protection against overvoltage while preventing generation of a malfunction caused by impulse noise. <P>SOLUTION: The power supply circuit 100, converting alternating current into a predetermined direct current, comprises: an overvoltage prevention circuit 70 for preventing generation of an overvoltage in a DC transmission line Ldc and an overcurrent protection circuit 30 for electrically cutting off an AC transmission line Lac when the overvoltage prevention circuit 70 detects an overvoltage, and further includes a low pass filter circuit 80 interposed between the DC transmission line Ldc and the overvoltage prevention circuit 70. <P>COPYRIGHT: (C)2012,JPO&INPIT |
