| 摘要 |
A three-switch step-down converter provides efficiency, size, cost and other performance advantages over the conventional two-switch buck converter and other step-down converters, over the entire duty ratio operating range. Unlike buck converter which uses only inductive energy transfer, the three-switch step-down converter employs the capacitive energy transfer in addition to inductive energy transfer to result in much reduced losses and better utilization of the switches resulting in reduced cost of the silicon needed for given efficiency performance. The present invention also introduces a new hybrid switching method, which implements for the first time use of odd number of switches, such as three in this case, which is strictly excluded from use in conventional Square-wave, Resonant and Quasi-resonant switching converters, which all require an even number of switches (2, 4, 6 etc.), operating as complementary pairs.
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