x ray generator

Danko

Joined Nov 22, 2017
2,153
Good morning, I would like to know why in this schematic rectification is done only with diodes, there is no filtrating capacitor and voltage regulator.
At first tell us, for what voltage regulator and filtrating capacitor should be in this circuit?
 

Papabravo

Joined Feb 24, 2006
22,065
At first tell us, for what voltage regulator and filtrating capacitor should be in this circuit?
Alternatively tell us what the electrical equivalent circuit for an X-ray tube looks like. Hint: it looks like a gap between two electrodes with a potentially very large potential difference across it.
 

MisterBill2

Joined Jan 23, 2018
27,316
The reason was explained to me many years ago. First, the X-Ray tube has no requirement for filtered voltage, ansd second, because the x-ray intensity at the peak is what is needed and third, because a capacitor would render the exposure times inaccurate. And the additional reason is that such a high voltage capacitor would reduce the reliability, create a very high turn-on surge, cost a lot, and provide no benefit except for shortening the X-ray tube life.
 

Thread Starter

alitronic

Joined Jun 13, 2020
68
The reason was explained to me many years ago. First, the X-Ray tube has no requirement for filtered voltage, ansd second, because the x-ray intensity at the peak is what is needed and third, because a capacitor would render the exposure times inaccurate. And the additional reason is that such a high voltage capacitor would reduce the reliability, create a very high turn-on surge, cost a lot, and provide no benefit except for shortening the X-ray tube life.
Thank you very much, I think that is the reason for using high frequency techniques in today x ray generators.
 

MisterBill2

Joined Jan 23, 2018
27,316
The system was never designed to need or to use a higher constant voltage. That is not how those X-Ray devices were operated. SEE post #5 for the explanation.
Not every rectifier power supply needs to be filtered. The X-Ray machine is one of those instances.
 
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