high voltage smps

Discussion in 'The Projects Forum' started by tonyben, Jul 20, 2006.

  1. tonyben

    Thread Starter New Member

    Jul 20, 2006
    Hello evry one, pls i need some hlp on smps. the power section of my ocsiloscope got bad, and i thought of building another for it. the voltages are + & - 8.6v , 30v , 100v and 2kv for the CRT.
    i used sg3524 pwm ic for the controller. I discovered that without the 2kv winding on the the transformer all other out puts will be generated. But once i put the 2kv winding, all other outputs will be halfed and the switching device will be very hot(max duty cyc). I dont know y dis is so can any one hlp?. The sullpy voltage is 42v. the 2kv winding is 670T frequecy is 85khz. the primary is 14T.
    I need help on how to get all outputs or design for a seperate 2kv source.
  2. mrmeval

    AAC Fanatic!

    Jun 30, 2006
    Can you retype this in English and provide a schematic?
  3. thingmaker3

    Retired Moderator

    May 16, 2005
    Does the 2Kv really need to be switched mode? Or do you want 42v chopped at at 85KHz to feed the transformer?