Analysis and Design of a New High-Efficiency Bidirectional Integrated ZVT PWM Converter for DC-Bus and Battery-Bank Interface

• Published in: IEEE transactions on industry applications Vol. 42; no. 5; pp. 1321 - 1332
• Main Authors: Schuch, L., Rech, C., Hey, H.L., Grundling, H.A., Pinheiro, H., Pinheiro, J.R.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-09-2006; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Batteries; Battery; Battery chargers; Bidirectional; Circuits; Converters; Costs; Design engineering; Efficiency; Electric batteries; IEC standards; Power electronics; Power system modeling; Pulse duration modulation; Pulse width modulation; Pulse width modulation converters; Soft switching; Switching circuits; uninterruptible power supply; Uninterruptible power systems; Voltage; zero-voltage transition (ZVT)
• ISSN: 0093-9994; 1939-9367
• DOI: 10.1109/TIA.2006.880847

This paper proposes a high-efficiency bidirectional integrated zero-voltage transition (iZVT) pulsewidth-modulation (PWM) converter for dc-bus and battery-bank interface. The proposed converter can operate as battery charger when the utility is within its acceptable voltage range and can supply energy to critical loads when the utility fails. The converter practically eliminates both low- and high-frequency current ripple on the batteries, thus maximizing battery life without penalizing the volume of the converter. Moreover, soft switching of all switches is achieved using the proposed integrated auxiliary commutation circuit (iACC). Just one iACC is used to provide soft-switching conditions for the three converters that compose the system: the preregulator (boost), the battery charger (bidirectional converter operating as a buck), and the backup converter (bidirectional converter operating as a boost). This auxiliary circuit has few components and low reactive energy, increasing the system's overall efficiency. Experimental results based on a 580-W prototype are presented to validate the analysis and the proposed design procedure and to demonstrate the performance of the proposed approach