| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power supply control device in which power supply to an electric device may be stopped when the electric device is not grounded or is connected to a power source with incorrect polarity and which is minimally deteriorated over time. <P>SOLUTION: A power supply control device 1 comprises a pair of transformers 2a and 2b different from each other in turn ratios of primary coils 21 and secondary coils 22. A primary coil group 210 is connected to power supply lines 40 and 41. A point between a pair of primary coils 21a and 21b is connected to a ground line 42 of an electric device 4. A secondary coil group 220 is connected to a control circuit 3 controlling power supply to the electric device 4. The control circuit 3 detects, in accordance with an induced voltage caused in the secondary coil group 220, whether or not the electric device 4 is connected to an AC power supply 7 (commercial power supply) with incorrect polarity and whether or not the electric device 4 is grounded. <P>COPYRIGHT: (C)2012,JPO&INPIT |
