Electronics > Projects, Designs, and Technical Stuff

Stable High Voltage (3kV) Photomultiplier Supply

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SiliconWizard:
Have you read "The boy electrician"? ;D

David Hess:

--- Quote from: Yansi on February 01, 2019, 03:38:58 pm ---Putting a non-regulated supply in series with a regulated one does not create a regulated high voltage supply. Or what did I miss?
--- End quote ---

Feedback from the combined high voltage is used to control the regulated supply.  In the designs I am thinking of, the regulated low voltage output was combined with the unregulated high voltage through a circuit much like a high voltage DC restorer.

ycui7:
https://www.spellmanhv.com/en/Products/PMT

very quite high voltage power supply. you can hardly measure the noise with a 1000:1 probe, as the noise is almost on the noise floor of typical digital oscilloscopes. That puts the noise upper limit to less than 1V.

Alternatively, you can go with Matsusada, or certain XP-EMCO module. Do not go with UltraVolt.

Yansi:
Why would you measure NOISE (AC) using a 1000:1 DC probe? Shouldn't that be measured with an AC COUPLED 1:1 probe instead?

Yansi:

--- Quote from: David Hess on February 02, 2019, 02:15:03 am ---
--- Quote from: Yansi on February 01, 2019, 03:38:58 pm ---Putting a non-regulated supply in series with a regulated one does not create a regulated high voltage supply. Or what did I miss?
--- End quote ---

Feedback from the combined high voltage is used to control the regulated supply.  In the designs I am thinking of, the regulated low voltage output was combined with the unregulated high voltage through a circuit much like a high voltage DC restorer.

--- End quote ---

Do you have any schematic on hand to give an example? I can't still think how one would regulate two supply voltages with just one series pass element. That seems impossible.

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