Re: 30 kV 10 mA power supply


booth wrote:
Hi All,
I need to design a 30 kV 10 mA capacitor Power Supply. Any Idea which
method is the best. How will it be isolated and what would it size be.
Many thanks for any hints.

Peter Baxandall devised his class-D oscillator in the first instance to

drive a nasty capacitative load. It looks quite like a Royer inverter,
but there is a capacitor across one of the transformer windings, which
-
with the inductance of the winding - forms an LC oscillator whose
resonant frequency determines the frequency of oscillation. The output
is a sine wave - more or less.

Jim Williams of Linear Technology rediscovered this circuit some years
ago, but - with a fine disregard for historical reality, describes it
as
Royer inverter. It is written up in Linear application notes AN49, AN55

and AN65

http://www.linear.com/pdf/an65f.pdf

His target application is back-lighting panels for the LCD screens of
portable computers, but his circuit generates the sort of voltage that
you want.

10mA at 30kV is 300 watt, so you may have to scale everything up a bit.

We've posted quite a lot on this circuit from time to time - search

http://groups.google.com/group/sci.electronics.design/

--
Bill Sloman, Nijmegen

.

Relevant Pages

  • Re: Help understanding circuits
    ... why isn't it on the bottom circuit? ... then that 1N4148 after the 4.7uF capacitor is a clamping diode. ... An oscillator by definition is an amplifier with feedback, ... it in effect puts the emitter at "ground" for AC signals, ...
    (sci.electronics.basics)
  • Re: PLL around Resonant LC Circuit
    ... >>> Are you sure that it is not better to put a capacitor across the primary ... >>> you have found a frequency better than the resonant frequency, ... I will do the same in the this circuit ... a LC oscillator will do that. ...
    (sci.electronics.design)
  • Re: Transmitter
    ... But with heat loss we do, I do not understand is HOW the C4 capacitor ... that is keeping a constant voltage for the oscillator. ... Although that tracker circuit shows an earth symbol connected to the ... It is an integral part of the oscillator. ...
    (sci.electronics.basics)
  • Re: Old Zenith safety caps.
    ... upon the other contact aspect to be the extensive area of foil that has ... Now getting to your special feature of the "safety capacitor". ... as compared to a circuit with out that aspect being present. ... you will find that the caps dual leads are ...
    (sci.electronics.repair)
  • Re: Ive got this problem with AC through capacitors (phase lag)
    ... > capacitor is a resistor having a fixed ohms value. ... of your circuit and via ... there's no such thing as an ideal capacitor anyway (and this fact ... you'd use a transient analysis. ...
    (sci.electronics.basics)