Abstract
It has always been an important and difficult problem for the designer of an intense current Cockcroft-Walton high voltage power supply to quantitatively select appropriate protective resistance so that not only can the power supply be protected reliably once the high voltage output terminal is short circuited but also the negative influence of the protective resistors to the load characteristics of the power supply and the significant but unnecessary power loss on the protective resistors when the power supply runs normally may be reduced to a minimum. In this article, thorough analyses are made to the equivalent circuits in each stage of the short circuit transient process of Cockcroft-Walton circuit. The results indicate that in this process, significant overcurrent only occurs in the rectifiers situated in the locations of the highest and lowest potentials of the voltage multiplier, but there is no significant overvoltage in any component. In order to quantitatively estimate the most possible maximum ∫0∞i2(t)dt value of the rectifiers corresponding to a certain protective resistance, a simplified equivalent circuit based on some reasonable assumptions is given and some formulas, which may enough be reasonably used as a basis of quantitative estimation in engineering design, are deducted.
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