Switching power supply type high voltage constant current source circuit diagram

Published:2011/11/14 1:58:00 Author:May | Keyword: Switching power supply, high voltage, constant current source | From:SeekIC

To develop a device instrument, we need a constant current source which can generate 1MA current on the resistor with the resistance value of0~3MΩ. We designed one by using UC3845 and 12V storage battery. Transformer adopts color TV high voltage package. L1 uses enameled wire to go around 24 turns on original high voltage package magnetic core. L3 gets help from one turn of original high voltage package. L2 gets help from high-voltage parts of high voltage package. Voltage limiting circuit consists of L3 and LM393. It can limit the output voltage and make it not too high. It can adjust the voltage of open circuit by adjusting R10.



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