Electronics > Projects, Designs, and Technical Stuff
High Voltage Power Supply for Multiplier Tube
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Kleinstein:
Needing some 2000 V for a PMT is quite high - the ones I have seen usually only need 800-1000V and max. out at some 1200 V.

Most of the current is usually needed not for the PMT itself, but for the divider to generate some 10 intermediate voltages. If at all the lower 1 or 2 stages may need a little more current. So the divider chain could be made higher impedance, and if really needed on could supply separate 100 V for the last  step.

A 0.5 W main supply and some 200 mW for the lower ones could be easier than 4 W total.
Marco:

--- Quote from: Yansi on June 15, 2019, 07:49:36 am ---Also, the appnote states clearly, the output is "miliampere level", so where did you get your 10mW bullshit?

--- End quote ---

Maximum power transfer theorem. The 820 Ohm limiting resistor limits it to around 8 mW at 5V supply with 100% efficiency. Two orders of magnitude more power makes a big difference, you can blow up a lot of transistors prototyping Royers. If even if all the power gets dissipated in the transistors doesn't matter, the circuit is obviously a bit more forgiving.
Yansi:
Then MODIFY the circuit to fit the purpose and stop complaining if you present yourself that smart enough.

And, btw, the 820 resistor feeds the BASE circuit of the transistors, not the collector tank circuit.  :palm:

You can blow many components if you will be incompetent. Designing a small resonant royer converter is actually quite easy, I do not see a reason why one would need to blow things up when designing a 2kV 4W converter.



Marco:

--- Quote from: Yansi on June 15, 2019, 11:18:16 am ---And, btw, the 820 resistor feeds the BASE circuit of the transistors, not the collector tank circuit.  :palm:

--- End quote ---

Oops.
Tomsik:
OK, when I decide I modify a schematic from shared "Analog document".
1. I must recalculate feedback,
2. choose new filtration capacitors (for 2200V)
3. consider other power transistor
4. Tranformer is problem, because how can i choose and calculate parameters of the transformer for 2200V and 2mA? 

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