Abstract
Bi-directional DC-DC converter is widely used in more and more areas. The paper proposed a novel type of bi-directional DC-DC converter topologies-forward-flyback bi-directional DC-DC converters. The converter has the following merits: 1) The spike on the switches is much smaller than the current-fed type converter, the energy that cause the spike is much smaller than that in the current-fed converter; 2) The current of one side of the bi-directional DC-DC converter is continuous, the current ripple is small; 3) There is no the start-up problem in the forward-flyback bi-directional DC-DC converter; 4) It is easy to realize soft switching; and 5) The hybrid structure of forward and flyback converter makes it suit for high power situation. The paper analyzed the steady state operation principles in detail. The experimental results verify the analysis. Based on the principle of active clamp forward-flyback bi-directional DC-DC converter, a family of bi-directional DC-DC converter is proposed.
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