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The high voltage steady circuit of photoelectric couplers

2014-11-10 09:00  
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The high voltage steady circuit of photoelectric couplers
As is indicated in the figure, common drive pipes are high voltage transistors( in the figure, the drive pipe is 9013). When the output voltage increases, the bias voltage of VT55 is stepping up, which makes the positive current of the LED in B5 increase and the voltages between light dependent pipes reduce, and the bias voltage on the adjusting pipe reduces but the internal resistance increases, so the output voltage reduces; on the contrary, the output voltage steps up, so that the output voltage is kept steady.