The switch power supply high voltage constant current source circuit (1)

Published:2011/7/21 1:06:00 Author:Borg | Keyword: switch power supply, high voltage, constant current source | From:SeekIC

Researching instruments need a constant current source which can generate a 1MA current on the 0-3MΩ, and one is designed with UC3845 and 12V battery, the transformer is the color TV high voltage package, of which the L1 is winded for 24 turns with covered wire on the magnet core, L3 is a coil with the former high voltage package, L2 is the high voltage part of the high voltage package. L3 and LM393 compose the voltage limiting circuit, which limits the output current, by adjusting R10, the output voltage of the open circuit can be regulated.



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