| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a silent phase controller of reduced noise by displacing a mode without changing a control singal generator by converting a control signal for TRIAC-type phase controller into a control signal providing OFF at an arbitrary phase angle by switching-on of an antiphase controller using power MOSFET by a specific voltage providing OFF after an ON width command signal is switched on with an arbitrary AC voltage phase. SOLUTION: A TRIAC gate signal 14 of a control signal capable of being switched on with an arbitrary AC voltage phase and off by 0 V voltage, gains the pulse for clock width by a time width extraction gate 16, and inputs the same to an up-counter 17. The number of pulses stored therein is input and stored in a down-counter 18, and counted down as the initial value in synchronization with the power 0 V signal generated in the next, and an ON signal of MOSFET7 activated in advance is reversed at a time when the value becomes 0. By repeating this operation, the TRIAC phase control signal is converted into a phase control signal capable of generating an ON signal from a 0 V point with the same ON width, and providing OFF at a predetermined time.</p> |
