A buck-boost full-bridge topology is preferred for low-input voltage, high gain, high-power battery fed front-end converter of an all-electric motor drive system. Variants of this topology feature high direct current (DC)-gain, soft switching, continuous input and output currents with a phase modulation/asymmetrical pulse width modulation (PWM) scheme. These variants exhibit a high-magnitude DC-current in the transformer primary winding for low-input voltage, high-power application leading to poor core utilisation and low-power density of the system. The operation and analysis of the converter are presented to highlight the DC-current in the transformer and to mitigate this, a hybrid control scheme (HCS) is proposed. The proposed HCS consists of a DC-current compensation (DCCC) loop to mitigate the DC-current in the transformer without altering the DC-gain with no additional components and output regulation (REG) loop to regulate the output. The output REG and DCCC loops are independent of each other. Soft switching is retained with this proposed scheme. The necessity to mitigate the DC-current, analysis, and implementation of the HCS is discussed. The verification of the proposed HCS scheme in simulation and the experimental prototype is presented.

References

1. 1)
  - 2. Schutten, M.J., Torrey, D.A.: ‘Improved small-signal analysis for the phase-shifted PWM power converter’, IEEE Trans. Power Electron., 2003, 18, (2), pp. 659–669.
2. 2)
  - 22. Romaneli, E.F., Barbi, I.: ‘A new DC-DC converter with low current ripple characteristics’. Telecommunications Energy Conf., INTELEC, Phoenix, AZ, USA, 2000, pp. 560–566.
3. 3)
  - 14. Jalbrzykowski, S., Citko, T.: ‘Current-fed resonant full-bridge boost DC/AC/DC converter’, IEEE Trans. Ind. Electron., 2008, 55, (3), pp. 1198–1205.
4. 4)
  - 15. Kong, X., Choi, L.T., Khambadkone, A.M.: ‘Analysis and control of isolated current-fed full bridge converter in fuel cell system’. Industrial Electronics Society, IECON 2004, 30th Annual Conf. of IEEE, Busan, South Korea, South Korea, 2004, vol. 3, pp. 2825–2830.
5. 5)
  - 24. Mira, M.C., Zhang, Z., Knott, A., et al: ‘Analysis, design, modeling, and control of an interleaved-boost full-bridge three-port converter for hybrid renewable energy systems’, IEEE Trans. Power Electron., 2017, 32, (2), pp. 1138–1155.
6. 6)
  - 27. Swaminathan, N., Lakshminarasamma, N.: ‘The steady-state DC gain loss model, efficiency model and the design guidelines for high power, high gain, low input voltage DC-DC converter’, IEEE Trans. Ind. Appl., 2018, 54, (99), p. 1.
7. 7)
  - 1. Sabate, J.A., Vlatkovic, V., Ridley, R.B., et al: ‘Design considerations for high-voltage high-power full-bridge zero-voltage-switched PWM converter’. Proc. IEEE APEC, Los Angeles, CA, USA, 1990, pp. 275–284.
8. 8)
  - 9. Zhao, L., Li, H., Hou, Y., et al: ‘Operation analysis of a phase-shifted full-bridge converter during the dead-time interval’, IET Power Electron., 2016, 9, (9), pp. 1777–1783.
9. 9)
  - 25. Cha, W.J., Kwon, J.M., Kwon, B.H.: ‘Highly efficient asymmetrical PWM full-bridge converter for renewable energy sources’, IEEE Trans. Ind. Electron., 2016, 63, (5), pp. 2945–2953.
10. 10)
  - 23. Romaneli, E.F., Barbi, I.: ‘An isolated ZVS-PWM active clamping nonpulsating input and output current DC-DC converter’. Power Electronics Specialists Conf., Galway, 2000, vol. 1, pp. 205–210.
11. 11)
  - 18. Mousavi, A., Das, P., Moschopoulos, G.: ‘A comparative study of a new ZCS DC-DC full-bridge boost converter with a ZVS active-clamp converter’, IEEE Trans. Power Electron., 2012, 27, (3), pp. 1347–1358.
12. 12)
  - 21. Li, C., Zhang, Y., Cao, Z., et al: ‘Single-phase single-stage isolated ZCS current-fed full-bridge converter for high power AC/DC applications’, IEEE Trans. Power Electron., 2017, 32, (9), pp. 6800–6812.
13. 13)
  - 19. Baei, M., Moschopoulos, G.: ‘A ZVS-PWM full-bridge boost converter for applications needing high step-up voltage ratio’. IEEE Applied Power Electronics Conf. and Exposition (APEC), Orlando, FL, USA, 2012, pp. 2213–2217.
14. 14)
  - 13. Lin, B.R.: ‘Analysis and implementation of wide zero-voltage switching dual full-bridge converters’, IET Power Electron., 2016, 9, (4), pp. 751–760.
15. 15)
  - 16. Nymand, M.: ‘High efficiency power converter for low voltage high power applications’. PhD thesis, Department of Electrical Engineering, Technical University of Denmark, 2010.
16. 16)
  - 4. Yadav, G.N.B., Lakshminarasamma, N.: ‘An active soft switched phase-shifted full-bridge DC-DC converter: analysis, modeling, design, and implementation’, IEEE Trans. Power Electron., 2014, 29, (9), pp. 4538–4550.
17. 17)
  - 10. Lin, B.R., Chu, C.W.: ‘Hybrid full-bridge and LLC converter with wide ZVS range and less output inductance’, IET Power Electron., 2016, 9, (2), pp. 377–384.
18. 18)
  - 26. Romaneli, E.F., Barbi, N.: ‘New isolated phase-shift controlled non-pulsating input and output converter’. Power Electronics Specialists Conf., Vancouver, BC, 2001, vol. 1, pp. 237–242.
19. 19)
  - 8. Woo-Young, C.: ‘High-efficiency duty-cycle controlled full-bridge converter for ultracapacitor chargers’, IET Power Electron., 2016, 9, (6), pp. 1111–1119.
20. 20)
  - 12. Chen, Z., Liu, S., Shi, L.: ‘Improved zero-voltage-switching pulse width modulation full bridge converter with self-regulating auxiliary current’, IET Power Electron., 2013, 6, (2), pp. 287–296.
21. 21)
  - 17. Zhu, L.: ‘A novel soft-commutating isolated boost full-bridge ZVS-PWM DC-DC converter for bidirectional high power applications’, IEEE Trans. Power Electron., 2006, 21, (2), pp. 422–429.
22. 22)
  - 28. Gertsman, A., Ben-Yaakov, S.: ‘Zeroing transformer's DC-current in resonant converters with no series capacitors’. IEEE Energy Conversion Congress and Exposition, Atlanta, GA, 2010, pp. 4028–4034.
23. 23)
  - 11. Karimi, R., Adib, E., Farzanehfard, H.: ‘Resonance based zero-voltage zero-current switching full bridge converter’, IET Power Electron., 2014, 7, (7), pp. 1685–1690.
24. 24)
  - 6. Pahlevaninezhad, M., Das, P., Drobnik, J., et al: ‘A novel ZVZCS full-bridge DC/DC converter used for electric vehicles’, IEEE Trans. Power Electron., 2012, 27, (6), pp. 2752–2769.
25. 25)
  - 3. Rajapandian, A.: ‘A Constant Frequency Resonant Transition Converter’. M.Sc. (Engg) thesis, Department of Electrical Engineering, Indian Institute of Science, Bangalore, 1995.
26. 26)
  - 20. Tsai, C.T., Chen, S.H.: ‘PV power-generation system with a phase-shift PWM technique for high step-up voltage applications’, Int. J. Photoenergy, 2012.
27. 27)
  - 5. Jang, Y., Jovanovic, M.M.: ‘A new family of full-bridge ZVS converters’, IEEE Trans. Power Electron., 2004, 19, (3), pp. 701–708.
28. 28)
  - 7. Safaee, A., Jain, P.K., Bakhshai, A.: ‘An adaptive ZVS full-bridge DC-DC converter with reduced conduction losses and frequency variation range’, IEEE Trans. Power Electron., 2015, 30, (8), pp. 4107–4118.

Hybrid control scheme for mitigating the inherent DC-current in the transformer in buck-boost full-bridge converter for an all-electric motor drive system

References

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