To provide a load control device for correctly controlling an opening/closing timing, while reducing the number of switching elements.
After receiving a charging completion signal of a buffer capacitor 29 from a voltage detecting part 18, a control part 13 outputs a first pulse so as to make a main opening/closing part 11 conductive only for a first predetermined time. After a zero-cross detecting part 19 detects the zero-cross point of a load current, the control part 13 outputs a second pulse so as to restrict the opening state of the main opening/closing part 11 for a second predetermined time which is less than the half period of the load current. A main opening/closing control part 25 calculates the logical AND of the first and second pulses, and outputs the result of the logical AND to the main opening/closing part 11. Consequently, the main opening/closing part 11 closes and is made conductive only during a period in which the first predetermined time when the first pulse is rising overlaps the second predetermined time when the second pulse is rising.
COPYRIGHT: (C)2010,JPO&INPIT
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Katsumi Taguchi
Shinichi Mizuta
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