| 摘要 |
<p>A switching circuit, method and control unit ( 1 ) for controlling electric power supply for lighting fixtures. The switching circuit has a control unit ( 1 ) with a sensor ( 11 ) for detecting intensity of light reaching the sensor, and a control circuit ( 2 ) for transmitting at least two different switching signals ( 21 - 23 ) at different times in response to the detected light intensity falling below a predetermined twilight value. The circuit further has switching devices ( 34 - 36 ), with a receiver ( 31 - 33 ) for receiving switching signals coming from the output circuit and for selectively generating a switching command for switching on the power supply in response to receiving a switching signal specifically intended for the relevant switching device; and a switching assembly ( 37 - 39 ) connected to the receiver for switching the electric power supply in response to a switching command coming from the receiver.</p> |
