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schematic power supply 0-150 VDC

Discussion in 'Electronic Design' started by Shahram, Feb 28, 2007.

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  1. Shahram

    Shahram Guest

    I need a schematic diagram for variable regulated power supply 0-150
    VDC and 2A
  2. rwmoekoe


    Feb 23, 2007
    hi ram,

    i'll try to draw 4 u 1 that'll work.
    plz gimme some additional info i need:

    what is the source? (220vac, or what?)
    have u tried the convensional bipolar power transistor (with a 723 or that kind) to build one yet?
    what're the obstacles?
    if not, why haven't u?

    thx alot!
  3. Rich Grise

    Rich Grise Guest

  4. Ken Smith

    Ken Smith Guest

    Some values are left as TBD. If you like the idea, I'll help you work out
    the values.

    I'll break it into 3 parts.

    Part 1: You need some small fixed voltage supply to runt the control
    electronics from. This is just a bridge and a transformer. The only
    special requirements are that it makes enough 5V as Vcc to run the
    electronics and has a connection to the transformer secondary brought out
    as a signal I'll call "CROSS"

    You will also need on/off switches and a pot to set the voltage with. The
    POT can simply use the Vcc as a reference.

    Part 2 the controller ascii art:

    Vcc Vcc
    ! Vcc !
    O 1N5304 ! -----
    --- ----- ---!THR !
    10K ! ! ! ! ! Q!--/\/\--!!--A
    Cross -/\/\--+-+-------------! !----+---!TRG !
    ! FB-----! ! ----- CMOS-555
    O POT----! ! !
    --- 1N5304 ----- PIC GND
    ! !

    Part 3 the power section:

    V SCR
    / ! 10R
    A----- --- +-----/\/\--------+-----+---- Vout
    )!!( ! ! !
    )!!( ! --- \
    GND--- ------- --- /
    ! \
    GND !
    +-- Vfb
  5. John Barrett

    John Barrett Guest

    a small boost regulator based on the IR1150 chip to get you a bus voltage in
    the 200-300 volt range, followed by a small adjustable buck to give your
    target output with current limiting -- you are looking at a couple of chips,
    a coupla big MOSFETs, a few resistors and capacitors, and a couple of
    inductors that may have to be hand wound :) (no different in essence than
    the 200v 40amp boost-buck design that I'm working on right now, except you
    want voltage mode regulaton. I run my bus at 400 volts, and use multiple
    boosts and bucks to share the load :)

    International rectifier has a designer for the boost converter on their
    website that will hand you the schematics on a platter along with all the
    component values

    then all you need to do is design the buck -- which should be fairly easy
    with all the online resources for buck converters.
  6. Wim Ton

    Wim Ton Guest

    A Variac, a bridge rectifier and some big capacitors? And maybe an
    insulation transformer!

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