| 摘要 |
The invention refers to a photo-relay for the individual automatic control of light sources, depending on the environmental illumination level. The photo-relay feeds directly from the 220 V/50 Hz voltage supplied by the network and is equipped with a capacitive voltage divider (C3) and a DC power supply (Pr-1, Dz-1, C2), which ensures the 24 Vcc voltage necessary to feed the radio components and the switch. The photo-relay is mounted directly onto the body of the lamp and is protected from dust and dampness by its enclosed mushroom-shaped design. The photo-relay can control the switching on/off of mercury or sodium lamps with powers up to 300 W. The photo-relay can adjust the light sensitivity level within the 1...20 lx range, by changing the value of a fixed barrier resistor (R2) that is mounted at the input of an integrated timer circuit (CI-1), and has a detachable construction. The use of the capacitive divider (C3) enables an important weight and size reduction, as well as a price cut for the photo-relay, and helps to improve the power factor within the network.
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