| 摘要 |
<p>PURPOSE: To fire all triacs simultaneously when a plurality of triacs are used by firing the triacs such that the electric load of a low voltage switching element matches the tiring load of each triac at the time firing. CONSTITUTION: After zero-cross of AC voltage is determined by a zero-cross detector 5, a microprocessor 24 is switched on. The microprocessor 24 delivers a uniform start pulse as shown by 24=. The start pulse passes through signal lines 25, 25= and arrives at a timer 28 in a pulse shaper 26. The timer 28 is activated by a calculator 27 being triggered by the microprocessor through connecting lines 31, 31=. Consequently, the pulses being delivered from the calculator 27 is transmitted such that they are not superposed at different moments of time t0 , t1 , as shown at 32.</p> |
