An Enhanced Ultra Capacitor Interface Circuit Based Bidirectional Soft Switching Converter

B. Stalin(1*), T. S. Sivakumaran(2)

(1) Department of Electrical and Electronics Engineering at Sri Krishna Engineering College, Chennai, India
(2) Department of Electrical and Electronics Engineering, Arunai College of Engineering, Tiruvannamlai, India
(*) Corresponding author


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Abstract


Nowadays the bidirectional PWM DC-DC converter connected with the storage system has a prominent option of the electrical appliances. In this soft switching techniques are used, because the soft switching PWM converter is defined as the combination of converter topologies and switching strategies that result in Zero Voltage Switching (ZVS) and Zero Current Switching (ZCS). In soft switching based storage system, the efficiency of system is depends on the size and cost; it can be increased by a combination of batteries and ultra capacitors. The ultra capacitor voltage changes during charge and discharge modes, therefore an interface circuit is required between the ultra capacitor and the battery. Also, the leakage current of ultra capacitor is high so the voltage imbalance problem has to be occurred. This paper describes an enhanced ultra capacitor interface circuit based bidirectional soft switching converter. The circuit of the proposed topology will be enhanced which will be based on the bidirectional conversion efficiency. The proposed circuit topology will be preferred for maintaining the conversion efficiency during static and dynamic working condition. Also, the working mode of both buck and boost conversion will be analyzed by the equivalent circuit model. The ultra capacitor leakage current will be reduced by the interface circuit which will utilize the resistance circuit. The soft switching condition of the proposed circuit topology will be maintained by the auxiliary circuit. So, the auxiliary circuit will be improved the conversion efficiency and the conduction loss will be reduced. The proposed bidirectional converter topology will be implemented in MATLAB working platform and the output performance will be analyzed
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Keywords


Ultra Capacitor; Zero Voltage Switching (ZVS); Zero Current Switching (ZCS); PWM DC-DC Converter

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