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Input Current Ripple Reduction Approach for the Interleaved Boost Converter

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Input current and its ripple of the interleaved boost converter with arbitrary number of phases are analyzed in details and the formula of quantifying input current and its ripple are derived. As a result, a new control approach of adjusting the active phase number and switching frequency to achieve the low or even zero input current ripples in the interleaved boost converter is proposed. Therefore the input filter can be significantly decreased on size and cost or even not needed in steady-state. In addition, the practical factors that affect the input current ripple are presented. Simulation and experimental results show that the input current ripple can be greatly decreased with this approach. Moreover, the principle of this control approach is also valid for other common interleaved dc-dc topologies.
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Discontinuous Conduction Mode (DCM); Interleaved Boost Converter; Zero Input Ripple Current

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