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1 Low-Common Mode Voltage H-Bridge Converter with Additional Switch Legs Abstract: H-bridge converter with additional switch legs (HA converter) and its offspring circuit are proposed in this paper with the intent to reduce the common mode noise. The proposed topology connects grounds of the input and output terminals, which gives zero common mode current in the ideal case. The operation of the proposed circuit is flexible and allows for the circuit to be capable of both ac-dc and dc-ac conversions. The proposed topology is especially advantageous when it is applied to the photovoltaic power conditioning system in dc distribution system or stand-alone power system because they include large stray capacitances and are prone to common mode EMI. In this paper, a 4-switch HA (HA4S) converter for both ac-dc rectification and dc-ac inversion is derived from the proposed HA converter as the implementation example. The experimental results based on the proposed and the conventional prototype circuits prove that the HA4S converter outperforms the conventional counterparts. INTRODUCTION: E days due to the fossil fuel depletion, energy demand increase, and carbon dioxide gas NERGY shortage and environmental problems are gathering global concerns in these emission. Renewable energy sources such as photovoltaic (PV) panels and wind turbines are highlighted as solutions to reduce the fossil fuel consumption and greenhouse gas emission, and dc distribution is considered as an emerging candidate of the new power distribution system [1]-[3]. The dc distribution system has many advantages such as high efficiency [4] and compatibility to the renewable energy sources. The dc distribution system shows better accessibility to the renewable energy sources than ac distribution counterpart by reducing the number of power conversion stages which interface the renewable energy source to the dc bus. To stabilize the dc distribution system against the fluctuating outputs of the renewable energy sources and achieve proper cooperation with the conventional ac utility grid, various power conversion technologies are employed. The power converters in the dc distribution system such as ac-dc rectifiers and Manuscript received March 31, 2012; revised June 26, 2012; accepted August 6, 2012. Date of current version October 26, 2012. Recommended for publication by Associate Editor T. Shimizu. www.frontlinetechnologies.org [email protected] +91 7200247247 2 Architecture Diagram: CONCLUSION: HA converter and its subset circuit HA4S converter have been presented. The proposed converters generate negligible common mode voltage because they fix the voltage level of the common mode stray capacitance by connecting the grounds input and output terminal. Due to its flexibility and expandability, the HA converter is capable of both ac-dc rectification and dc-ac inversion by properly selecting the switching states. The operation analysis and dedicated control algorithm for line current shaping and control have been illustrated. The experimental results verify that the proposed HA4S converter shows lower common mode EMI than the conventional counterpart, while demonstrating comparable efficiency in both ac-dc and dc-ac conversion. References: 1. J. M. Carrasco, L. G. Franquelo, J. T. Bialasiewicz, E. Galvan, R. C. Portillo Guisado, M. A. M. Prats, J. I. Leon, and N. Moreno-Alfonso, “Power- electronic systems for the grid integration of renewable energy sources: A survey,” IEEE Trans. Ind. Electron., vol. 53, no. 4, pp. 1002-1016, Jun. 2006. 2. H. Kakigano, Y. Miura, and T. Ise, “Low voltage bipolar type DC microgrid for super high quality distribution,” IEEE Trans. PowerElectron., vol. 25, no. 12, pp. 30663075, Nov./Dec. 2010. 3. A. Kwasinski, “Quantitative evaluation of dc micro-grids availability: effects of system architecture and converter topology design choices,” IEEE Trans. PowerElectron., vol. 26, no. 3, pp. 835-851, Mar. 2011. www.frontlinetechnologies.org [email protected] +91 7200247247 3 4. A. Pratt, P. Kumar, and T. V. Aldridge, “Evaluation of 400 V DC distribution in telco and data centers to improve energy efficiency,” in Proc. IEEE 29th Int. Telecommun. 5. 6. Energy Conf., 2007-2010, pp. 32-39. H. Ott, Electromagnetic Compatibility Engineering. Hoboken, NJ: Wiley, 2009. A. F. Souza and I. Barbi, “High power factor rectifier with reduced conduction and commutation losses,” in Proc. Int. Telecommun. Energy Conf., Jun. 1999, pp. 8.1.1— 8.1.5. 7. P. Kong, S. Wang, and F. C. Lee, “Common mode EMI noise suppression for bridgeless PFC converters,” IEEE Trans. Power Electron., vol. 23, no. 1, pp. 291-297, Jan. 2008. 8. K. Mainali and R. Oruganti, “Conducted EMI mitigation techniques for switch-mode power converters: A survey,” IEEE Trans. ., vol. 25, no. 9, pp. 2344-2356, Sep. 2010. 9. L. Huber, Y. Jang, and M. M. Jovanovic, “Performance evaluation of bridgeless PFC boost rectifiers,” IEEE Trans. Power Electron., vol. 23, no. 3, pp. 1381-1390, May 2008. 10. P. Kong, S. Wang, F. C. Lee, and C. Wang, “Common-mode EMI study and reduction technique for the interleaved multichannel PFC converter,” IEEE Trans. PowerElectron., vol. 23, no. 5, pp. 2576-2584, Sep. 2008. www.frontlinetechnologies.org [email protected] +91 7200247247