Abstract
The development of a DC-DC three-port converter (TPC) is proposed in this paper. Through the combination of a bidirectional Cuk converter and a high frequency transformer with a full-bridge (FB) rectifier circuit, two non-isolated energy ports and one isolated energy port are achieved. A LC series-resonant circuit is employed, resulting in soft-switching in the power switches. The bidirectional Cuk converter, controlled by pulse width modulation (PWM), and the tank resonant circuit, controlled by pulse frequency modulation (PFM) above the resonance frequency, allow two control variables for the topology. Furthermore, the power switches are shared for the operation of both circuits, reducing the number of active components. Voltage and current regulation are performed for applications with photovoltaic panel and bank of batteries. Operation modes, converter analysis and control strategy of the proposed TPC are presented. Experimental results are implemented to discuss the feasibility of the proposed TPC.
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