Solar light control switch composed of silicon photocell

Published:2011/3/29 21:16:00 Author:Nicole | Keyword: Solar light control switch, silicon photocell | From:SeekIC

The circuit consists of crystalline silicon solar cell (photovoltaic cell), relay, variable resistor, transistor, 9V DC power supply, manual switches and so on. The main contacts 1, 2 of relay is the coil contacts, 3, 4 connect normally closed contact, 3, 5 connect normally opened contact, the 3, 4, 5 connect to the load circuit. When the light is greater than 220lm, S will be closed, power supply make the transistor forward bias, relay closed, then normally closed contacts 3, 4 of the control load disconnected, normally opened contact 3, 5 closed, street light or lighthouse loop disconnected, and then went out. In rainy days, the light is just below 220lm, and the light is off, it should cut off the switch S, relay releases, then the circuit to restore original state. The components can be selected: amorphous silicon cell with six conduction units, 37.82cm2, leading to positive and negative. VT selects 3DG6 models. Relay adopts highly sensitive, the operation voltage is 9V, the internal resistance is in the range of 300Ω ~ 2kΩ.



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