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vacon • 25
BASIC VARIANTS
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The maximum value for the ripple of the choke is obtained when d = 1/2
For the output current ripple there are three segments. When d < 1/3, two switches are always at
low state and one switch is either low or high. When 1/3 < d < 2/3, one switch is low, one high and
one is either low or high. And when d > 2/3, two switches are always high and one either low or high.
With d = 1/3 and d = 2/3, output ripple is in theory cancelled. In practice simultaneous switching
prohibit causes some ripple. Disabling simultaneous switching prohibit logic will reduce fluctuation
near d = 2/3 and d = 1/3 considerably.
The maximum value is obtained with three different duty cycles:
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