| 摘要 |
PURPOSE:To control remotely an illuminator at a high place to a desired position, by controlling a load current at a prescribed firing angle in every positive or negative half cycle. CONSTITUTION:Switches 2 and 2' are connected in series and are connected in parallel to a load current phase controlling circuit 3 which controls the load current at a prescribed firing angle in every positive or negative half cycle. When the switch 2 is turned off, the load current including a higher harmonic in the positive side is flowed. This current is supplied to a higher harmonic rectifying circuit 4, and higher harmonic components are taken out. Higher harmonic components are given to a controlling circuit 5, and a motor 50 is rotated clockwise to raise the illuminator including the rectifying circuit 4, the controlling circuit 5, and a lamp 6. When the switch 2' is turned off, the illuminator falls by a negative-side higher harmonic. Thus, the illuminator at a high place is controlled remotely to a desired position. |
