Simple light-operated street lamp circuit diagram(3)

Published:2011/6/27 21:57:00 Author:Ecco | Keyword: Simple , light-operated , street lamp | From:SeekIC

VDP is the photodiode and it has low resistance in the day, and resistance ≤ 1kΩ, then transistor VT2 is turned off, then thyristor VT1 is in the off-state as the gate has no trigger current, and E can not be lit. In the night, VL shows a high resistance as no light exposure, and the resistance ≥ 100kΩ, then VT2 is turned on, and the emitter can output positive trigger current whcih is flowing through the gate of VT1, the opening of VT1, then E is lit. Adjusting RP can turn on EL when the lighting circuit needs to be lit. The regulator VS is set in the circuit to make it work more stable and reliable.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Control_Circuit/Simple_light_operated__street_lamp_circuit_diagram3.html

Print this Page | Comments | Reading(3)