Walton Cockroft Example PDF

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Example 6.1: A Cockcroft-Walton type voltage multiplier has eight stages with capacitances,all equal to 0.05uF. The supply transformer secondary voltage is 125kV* at a frequency of 150Hz. If the load current to be supplied is 5 mA, find (a) the percentage ripple, (b) the regulation, and (c) the optimum number of stages for minimum regulation or voltage drop. Example 6.1 Naidu A Cockcroft-Walton type voltage multiplier has eight stages with capacitances C. Supply transformer secondary voltage Vs and frequency f. Load Current is I. C  0.05F Vs 

125

kV

...Transformer voltage should have been given as rmsLQWKHWH[WERRN DO NOT divide by square root of 2 in other examples.

2 f  150Hz I  5mA n  8

V 

I

[n  ( n  1 ) ]

f C

2

V  24 kV

%ripple 

V100 2  n 2 Vs

%ripple  1.2 % V 

2   I    2 n 3  n  n  2 6  f C   3

V  248 kV %regulation 

V 2  n  2  Vs

100 %

%regulation  12.4 % n optimum 

2  2  Vs

n optimum  19.365 (Use 20 stages)

f C I...