| Abstract |
The electric power control of thermal houshold appliances must be brought into accord with IEC 555 (low voltage fluctuations, harmonics and direct currents) which is difficult for halogen heaters because of their high starting currents. A computational analysis was made including the thermal time behaviour of incandescent lamps, their dynamical electric loads and their influence on the flickermeter output. A solution is presented using three triacs for the synchronous multicycle control of two halogen lamps. Besides the well known basic power steps in series, diodes antiparallel, and parallel the time management of half wave control enables additional power steps between with low voltage fluctuations and fundamental frequencies of 16 2/3 Hz. As a result quasicontinuous control is possible between 5% and full power (2-3 kW). |
