| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To cyclically control the output power of an AC generator the frequency and output voltage of which fluctuate. <P>SOLUTION: A pair of thyristors 5 are connected antiparallel, and one AC switch 4 is constituted. A controller is constituted of the AC switch 4 connected between the output terminal of the AC generator 1 and a load 7 and an AC switching control means 9 adjusting power supplied from the AC generator 1 by controlling the switch operation of the AC switch 4. In the AC switch control means 9, a conduction command generating means 15 outputs a energization command (g) in synchronization with a zero-cross point, conducts the AC switch 4 and supplies power to the load 7 when a zero-cross detection circuit detects the zero-cross point of voltage. When power is supplied to the load 7, an output I<SB>11</SB>of a load current valid value integration circuit is increased. When the value becomes a first threshold Ia or larger, the conduction command generation means 15 stops the conduction command (g). The AC switch 4 goes into off state, and the supply of power is stopped. When an integral value becomes a second threshold Ib or lower, power supply is resumed. <P>COPYRIGHT: (C)2003,JPO</p> |
