Transcription of Current Doubler Rectifier Offers Ripple Current …
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Current Doubler Rectifier Offers Ripple Current …
Application NoteSLUA323 September 20041 Current Doubler Rectifier Offers Ripple CurrentCancellationSteve MappusSystem PowerABSTRACTThe Current Doubler Rectifier is a popular alternate choice for the output stage of a buckderived power converter, which would otherwise use a conventional center-tappedtransformer with secondary-side, full-wave rectification. Power topologies within this classwould include the push pull, half bridge and full bridge. There are many advantages that canbe gained by using a Current Doubler Rectifier but by far the least mentioned is the ability tocancel Ripple Current seen at the output capacitor. Output Ripple Current cancellation reducesthe required output capacitance producing less noise at the power supply output. The degreeof Ripple Current cancellation is duty cycle dependent, so design specifications such as inputvoltage and transformer turns ratio need careful illustrated in Figure 1, the Current Doubler uses two output inductors, each carrying half thetotal load Current and operating at half the switching frequency.
SLUA323 − September 2004 Current Doubler Rectifier Offers Ripple Current Cancellation 3 2 Ripple Current Cancellation While all of these benefits are noteworthy, perhaps the greatest motivation for using the current
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