Light control energy-saving lamp (1) circuit

Published:2013/2/17 20:42:00 Author:Ecco | Keyword: Light control, energy-saving lamp | From:SeekIC

The working principle of the circuit is shown as figure, it is composed of the photoelectric conversion part, NAND gate, differential circuit and control circuit. When there is light, the photosensitive diode VD1 gets conduction, the potential of point A reaches the NAND gate YF1 door level, the output terminal of point b shows low potential, YF2 outputs the high potential, C1 and R5 form a differential circuit which outputs positive spikes at the point C, so BG1 gets conduction, J1 is instantaneously pulled ( then release ). Normally closed contact J1-1 is disconnected, CJ1 loses power and releases, the self-protection contact CJ1-1 disconnects, then the light is off.



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