Abstract
Abstract—A three-port triple-half-bridge bidirectional dc–dc
converter topology is proposed in this paper. The topology comprises
a high-frequency three-winding transformer and three
half-bridges, one of which is a boost half-bridge interfacing a
power port with a wide operating voltage. The three half-bridges
are coupled by the transformer, thereby providing galvanic isolation
for all the power ports. The converter is controlled by
phase shift, which achieves the primary power flow control, in
combination with pulsewidth modulation (PWM). Because of
the particular structure of the boost half-bridge, voltage variations
at the port can be compensated for by operating the boost
half-bridge, together with the other two half-bridges, at an appropriate
duty cycle to keep a constant voltage across the half-bridge.
The resulting waveforms applied to the transformer windings are
asymmetrical due to the automatic volt-seconds balancing of the
half-bridges. With the PWM control it is possible to reduce the
rms loss and to extend the zero-voltage switching operating range
to the entire phase shift region. A fuel cell and supercapacitor
generation system is presented as an embodiment of the proposed
multiport topology. The theoretical considerations are verified by
simulation and with experimental results from a 1 kW prototype.
Original language | English |
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Pages (from-to) | 782-792 |
Number of pages | 11 |
Journal | IEEE Transactions on Power Electronics |
Volume | 23 |
Issue number | 2 |
DOIs | |
Publication status | Published - 2008 |