| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a controller capable of determining a true zero-cross point by utilizing only half waves of a commercial power supply. <P>SOLUTION: A controller includes: a zero-cross detection part which is connected to a commercial power supply and detects the vicinity of a zero-cross point by utilizing half waves of the commercial power supply; a zero-cross detection control part which processes a zero-cross signal detected by the zero-cross detection part to determine a true zero-cross point; and a load control part which controls power supply to a load which operates by the commercial power source by being synchronized with the true zero-cross point processed by the zero-cross detection control part, in which the zero-cross detection control part determines the true zero-cross point by calculating an interval between a rising edge of a zero-cross signal in the first period detected by the zero-cross detection part and a rising edge of a zero-cross signal in the second period, and a preset constant showing delay time until the zero-cross detection part detects the rising edge from the true zero-cross point. <P>COPYRIGHT: (C)2013,JPO&INPIT |
