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Digital current balancing for an interleaved boost PFC

Authored on: Apr 1, 2013 by Bosheng Sun

Technical Paper / Application Note

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This paper discusses three different digital-control methods of balancing inductor currents. The first method senses the inductor current on each switching cycle, compares the current difference between the two phases, then adjusts the duty ratio of one phase cycle-by-cycle. The second method only adjusts the duty ratio in each half AC cycle. The third method uses two independent current loops to control each phase individually. Since these loops share the same current reference, the current is balanced automatically.
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