Abstract
A novel
bidirectional dc-dc converter is presented in
this paper. The circuit configuration of the
proposed converter is very simple. The proposed converter employs a coupled
inductor with same winding turns in the primary and
secondary sides. In step-up mode, the primary and
secondary windings of the coupled inductor are
operated in parallel charge and series discharge to
achieve high step-up voltage gain. In step-down mode, the primary and secondary windings of the
coupled inductor are operated in series charge and
parallel discharge to achieve high step-down voltage gain. Thus, the proposed converter has higher step-up and
step-down voltage gains than the conventional bidirectional
dc-dc boost/buck converter. Under same electric specifications for the
proposed converter and
the conventional bidirectional boost/buck converter, the average value of
the switch current in the proposed converter is less
than the conventional bidirectional boost/buck converter. The operating principle and
steady-state analysis are discussed in detail.
Finally, a 14/42-V prototype circuit is implemented
to verify the performance for the automobile dual-battery system.
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