| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a power supply control method that allows power supply to a load to be continued without interruption of the power supply when power supply from one of a plurality of AC power supplies connected to the load is stopped. <P>SOLUTION: During a normal state in which a first AC power supply and a second AC power supply, connected in parallel to a load, are in an operating state, power is supplied to the load as follows. The first AC power supply supplies power to the load via a first semiconductor switch composed of a pair of semiconductor elements mutually having opposite conduction directions and connected in parallel. In parallel with the power supply to the load from the first AC power supply, the second AC power supply supplies power to the load via a second semiconductor switch composed of a pair of semiconductor elements mutually having opposite conduction directions and connected in parallel. When it is changed from the normal state to the abnormal state in which the operation of the first AC power supply is stopped, both conduction directions of the first semiconductor switch are put into a non-conductive state while continuing the power supply from the second AC power supply to the load via the second semiconductor switch. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
