Abstract
A DC converter with the benefits of reverse power capability, less switching loss and wide voltage operation is presented and implemented for wide input voltage applications such as fuel cell energy, photovoltaic (PV) system and DC wind power. Two full bridge resonant circuits are used in the presented converter to achieve bidirectional power flow capability and reduce switching losses on active devices. To overcome the wide input DC voltage variation problem for fuel cell energy and PV solar panel, the topology morphing between the half bridge circuit and full bridge circuit is adopted on the primary side to obtain low (or high) voltage gain under a high (or low) input voltage condition. Therefore, the stable DC voltage is controlled at the load side by using the variable switching frequency modulation. The studied hybrid CLLC converter is tested by a 1 kW prototype and the performance is verified and confirmed by experiments.
Highlights
DC and AC renewable power conversions with power converters [1,2] have been studied and presented to lessen the effect of global warming
Bidirectional converters have been presented and used in electric vehicle systems [4] or energy storage systems based on battery stacks
Three power converters are used in this circuit topology to implement a 500 W
Summary
DC and AC renewable power conversions with power converters [1,2] have been studied and presented to lessen the effect of global warming. In [9], a half bridge converter with the pulsewidth modulation plus phase-shift control was presented to achieve bidirectional power operation. This circuit topology is a two-stage DC/DC converter. Bidirectional resonant converters with two half bridge circuits were presented in [13] to achieve bidirectional power operation for electric vehicle applications. A new resonant converter is studied and presented to realize wide input voltage operation, low switching loss and bidirectional power flow operation. The adopted bidirectional resonant converter can be used in renewable power conversion with a wide voltage variation characteristic such as DC wind power, fuel cell power, solar power and a battery charger/discharger system.
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