Einstein International Journal Organization(EIJO)

Abstract  

In this paper, a high-conversion-ratio bidirectional dc-dc converter with coupled inductor is proposed. In the boost mode, two capacitors are parallel charged and series discharged by the coupled inductor. Thus, high step-up voltage gain can be achieved with an appropriate duty ratio. The voltage stress on the main switch is reduced by a passive clamp circuit. Therefore, the low resistance RDS (ON) of the main switch can be adopted to reduce conduction loss. In the buck mode, two capacitors are series charged and parallel discharged by the coupled inductor. The bidirectional converter can have high step-down gain. Aside from that, all of the switches achieve zero voltage-switching turn-on, and the switching loss can be improved. Due to two active clamp circuits, the energy of the leakage inductor of the coupled inductor is recycled. The efficiency can be further improved. The operating principle and the steady-state analyses of the voltage gain are discussed. Finally, a 24-V-input-voltage, 400-V-output-voltage, and 200-W-output-power prototype circuit is implemented in the laboratory to verify the performance.

Keywords: DC, Coupled Inductor, RDS, I/O-Put Voltage.

[1] R. Gules, J. D. P. Pacheco, H. L. Hey, and J. Imhoff, “A maximum power point tracking system with parallel connection for PV stand-alone applications,” IEEE Trans. Ind. Electron., vol. 55, no. 7, pp. 2674–2683, Jul. 2008.

[2] R. J. Wai, R. Y. Duan, and K. H. Jheng, “High-efficiency bidirectional dc–dc converter with high-voltage gain,” IET Power Electron., vol. 5, no. 2, pp. 173–184, Feb. 2012.

[3] R. Y. Duan and J. D. Lee, “High-efficiency bidirectional dc–dc converter with coupled inductor,” IET Power Electron., vol. 5, no. 1, pp. 115–123, Jan. 2012.

[4] R. J. Wai and R. Y. Duan, “High-efficiency bidirectional converter for power sources with great voltage diversity,” IEEE Trans. Power Electron., vol. 22, no. 5, pp. 1986–1996, Sep. 2007.

[5] M. Jang and V. G. Agelidis, “A minimum power-processing-stage fuelcell energy system based on a boost-inverter with a bidirectional backup battery storage,” IEEE Trans. Power Electron., vol. 26, no. 5, pp. 1568– 1577, May 2011.

[6] G. Ma, W. Qu, G. Yu, Y. Liu, N. Liang, and W. Li, “A zero-voltages witching bidirectional dc–dc converter with state analysis and soft switching- oriented design consideration,” IEEE Trans. Ind. Electron., vol. 56, no. 6, pp. 2174–2184, Jun. 2009.

[7] F. Z. Peng, H. Li, G. J. Su, and J. S. Lawler, “A new ZVS bidirectional dc–dc converter for fuel cell and battery application,” IEEE Trans. Power Electron., vol. 19, no. 1, pp. 54–65, Jan. 2004.

[8] H. Li, F. Z. Peng, and J. S. Lawler, “A natural ZVS medium-power bidirectional dc–dc converter with minimum number of devices,” IEEE Trans. Ind. Appl., vol. 39, no. 2, pp. 525–535, Mar./Apr. 2003.

[9] B. R. Lin, C. L. Huang, and Y. E. Lee, “Asymmetrical pulse-width modulation bidirectional dc–dc converter,” IET Power Electron., vol. 1, no. 3, pp. 336–347, Sep. 2008.

[10] K. Wu, C. W. de Silva, and W. G. Dunford, “Stability analysis of isolated bidirectional dual active full -bridge dc–dc converter with triple phase-shift control,” IEEE Trans. Power Electron., vol. 27, no. 4, pp. 2007–2017, Apr. 2012.

[11] Z.Wang and H. Li, “A soft switching three-phase current-fed bidirectional dc–dc converter with high efficiency over a wide input voltage range,” IEEE Trans. Ind. Electron., vol. 27, no. 2, pp. 669–684, Feb. 2012.

[12] F. Zhang and Y. Yan, “Novel forward-fly back hybrid bidirectional dc–dc converter,” IEEE Trans. Ind. Electron., vol. 56, no. 5, pp. 1578–1584, May 2009.

[13] S. Jalbrzykowski, A. Bogdan, and T. Citko, “A dual full-bridge resonant class-E bidirectional dc–dc converter,” IEEE Trans. Ind. Electron.,vol. 58, no. 9, pp. 3879–3883, Sep. 2011.