| 摘要 |
<p>PURPOSE:To avoid the influence of inrush current by detection of the phase of the voltage that makes minimum that inrush current and applying the voltage of an electric power to a load by the timing of this detection. CONSTITUTION:A switching device 2 is constituted with a phase detection circuit as a detecting means to detect the phase of the voltage of a commercial A/C power source, triac 5 as a switching means to connect or disconnect circuit and an operating switch 6. The operating switch 6 is a two-pole change-over switch and this switch is changed over and the gate of the triac 5 is triggered by the detection timing of a phase detection circuit 4 to pass current through the triac 5 and the circuit is closed and voltage is applied to the load 3. In this case the phase detection circuit 4 detects the phase at which the voltage of the power source 1 is the peak value. The influence of the inrush current can be eliminated by actuating the triac 5 at the timing of this phase detection.</p> |
