| 摘要 |
PURPOSE:To supply stable power from an AC power supply to a plurality of loads, by performing phase control so that conductive phase angles can not be overlapped with each other. CONSTITUTION:An on-timing of a transistor Q1 is synchronized with a zero cross point of a power supply voltage for off-timing control and the conduction phase control for the 1st half of each AC half wave can be obtained for a load L1. On the other hand, the off-timing of a transistor Q2 is synchronized with the zero cross point of the power supply for the on-timing control and the conductive phase control of the latter half of each AC half wave can be obtained for a load L2. Thus, the power conduction period can be averaged, no distortion is given to the waveform of total load current and power can efficiently be supplied to the loads L1 and L2. |
