Author Topic: Are CW multiplier diode resistors needed?  (Read 2173 times)

Offline MRMILSTAR

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Are CW multiplier diode resistors needed?
« on: December 17, 2019, 09:52:40 PM »
Does anyone think that I need current-limiting resistors on the charging diode strings? My design specs are:

* 14 stages
* 1.7 nF doorknob capacitors rated for 30 KV
* Each charging diode string consists of three 20 KV diodes rated for 30 ma each
* 4.5 Mohm resistor string feeding the top load for HV current limiting
* Power supply consisting of 2 identical AC flyback transformers in parallel
* Flyback transformers driven by ZVS driver (Royer oscillator)
* Target peak HV power supply voltage of 15 KV
* Everything is in oil

I would like to avoid using current-limiting resistors on the diode strings because space is tight.
« Last Edit: December 17, 2019, 10:04:04 PM by MRMILSTAR »
Steve White
Cedar Rapids, Iowa
Retired electrical engineer

Offline klugesmith

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Re: Are CW multiplier diode resistors needed?
« Reply #1 on: December 18, 2019, 12:09:43 AM »
Maybe it's time for a schematic diagram, to avoid all ambiguity.

For compactness, you could define a "stage" with a dotted line around it, and omit some middle stages from the drawing.

Reference designators (e.g. C6, D7) make it much easier to discuss schematics using written words.
Their numbers don't need to be contiguous, so you could make the more significant digits match the stage number.

Offline davekni

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Re: Are CW multiplier diode resistors needed?
« Reply #2 on: December 18, 2019, 03:02:14 AM »
Steve,

My multiplier didn't include any resistors at the diodes, just the one long string at the output as you're planning.  The only reason that comes to mind for possibly using resistors is to protect diodes from a sudden cap discharge, as would occur if you didn't have the output resistor string.
David Knierim

High Voltage Forum

Re: Are CW multiplier diode resistors needed?
« Reply #2 on: December 18, 2019, 03:02:14 AM »

 


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