To provide a phase control device which realizes low noise, prevention of element damage due to short circuit current, low cost, and small-sizing.
The CPU circuit 12 of the control section 1 establishes a current sensing period in which the current sensing action wherein IGBT Q4 is switched on for a short time at a low phase angle in the vicinity of zero cross of the AC power supply voltage is carried out for prescribed times from the operation start and until a prescribed time, and compares the detected value obtained by detecting by a shunt resistor R6 at the time of this current sensing with a plurality of the reference values established beforehand, and based on this comparison result, selects the conduction configuration of the IGBT Q4 and a triac Q1.
COPYRIGHT: (C)2005,JPO&NCIPI
Tsunehiro Kitamura
Norihiro Murata
Kenji Okada
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| JP61176614U |
Atsuo Mori