| 摘要 |
<p>The regulator can be adapted to the regulation of light intensity of both compensated and non compensated discharge lamps (L) connected to the alternating-current mains. Two two-way switch elements (S1,S2) and a control logic circuit (4) are provided for the switch elements. The circuit breaks the supply current at least once in each half-cycle in which current has been conducted from the zero-crossinq point to the moment corresponding to a set value. The switch element (S1) is connected in series with the load (L) and controlled on each half-cycle to break the current from the mains towards the load but to permit current flow in the opposite direction. The other two-way switch element (S2) is coupled parallel to the load (L) and controlled on each half-cycle to block current flow in the direction of the mains voltage but to permit the oppositely directed current flow therethrough. The regulator eliminates current peaks produced by voltage differences at switch-on and may include a current limiting arrangement (5).</p> |
