This study proposes an input-voltage-sharing control scheme for use in input-series-output-series (ISOS) systems. An ISOS system consists of a set of closed-loop DC/DC converters. Each converter has a metal–oxide–semiconductor field-effect transistor (MOSFET) connected in parallel on the input side that is controlled by an input-voltage-sharing loop. The MOSFET works in the linear region to adjust the input power equilibrium. The proposed control scheme makes the closed-loop converters function as power devices that can be combined quickly and flexibly according to the specific voltage conversion requirements, which greatly shortens the time required to develop an ISOS system. The design principle of the input-voltage-sharing loop and the time and frequency domain simulation results are also provided in this study. A 600 W prototype composed of two DC/DC converters was built and employed to verify the steady state and dynamic characteristics of the proposed control scheme.

References

1. 1)
  - 2. Giri, R., Choudhary, V., Ayyanar, R., et al: ‘Common-duty-ratio control of input-series connected modular DC-DC converters with active input voltage and load-current sharing’, IEEE Trans. Ind. Appl., 2006, 42, (4), pp. 1101–1111.
2. 2)
  - 14. Kim, J.W., Yon, J.S., Cho, B.H.: ‘Modeling, control, and design of input-series-output-parallel-connected converter for high-speed-train power system’, IEEE Trans. Ind. Electron., 2001, 48, (3), pp. 536–544.
3. 3)
  - 5. Pagliosa, M.A., Faust, R.G., Lazzarin, T.B., et al: ‘Input-series and output-series connected modular single-switch flyback converter operating in the discontinuous conduction mode’, IET Power Electron., 2016, 9, (9), pp. 1962–1970.
4. 4)
  - 15. Grbovic, P.J.: ‘Master/slave control of input-series- and output-parallel-connected converters: concept for low-cost high-voltage auxiliary power supplies’, IEEE Trans. Power Electron., 2009, 24, (2), pp. 316–328.
5. 5)
  - 8. Chen, W., Wang, G., Ruan, X., et al: ‘Wireless input-voltage-sharing control strategy for input-series output-parallel (ISOP) system based on positive output-voltage gradient method’, IEEE Trans. Ind. Electron., 2014, 61, (11), pp. 6022–6030.
6. 6)
  - 6. Bottion, A.J.B., Barbi, I.: ‘Input-series and output-series connected modular output capacitor full-bridge PWM DC-DC converter’, IEEE Trans. Ind. Electron., 2015, 62, (10), pp. 6213–6221.
7. 7)
  - 20. Ahmadi, R., Paschedag, D., Ferdowsi, M.: ‘Closed-loop input and output impedances of DC-DC switching converters operating in voltage and current mode control’. Proc. IECON 2010-36th Annual Conf. IEEE Industrial Electronics Society, November 2010, pp. 2311–2316.
8. 8)
  - 4. Pagliosa, M.A., Lazzarin, T.B., Barbi, I.: ‘Input-series and output-series connected modular two-switch flyback converters operating in ccm’. Proc. IEEE 25th Int. Symp. Conf., June 2016, pp. 493–497.
9. 9)
  - 10. Ayyanar, R., Giri, R., Mohan, N.: ‘Active input-voltage and load-current sharing in input-series and output-parallel connected modular DC–DC converters using dynamic input-voltage reference scheme’, IEEE Trans. Power Electron., 2004, 19, (6), pp. 1462–1473.
10. 10)
  - 16. Wei, Q., Wu, B., Xu, D., et al: ‘Model predictive control of capacitor voltage balancing for cascaded modular DC-DC converters’, IEEE Trans. Power Electron., 2017, 32, (1), pp. 752–761.
11. 11)
  - 18. Sha, D., Guo, Z., Luo, T., et al: ‘A general control strategy for input-series–output-series modular DC–DC converters’, IEEE Trans. Power Electron., 2014, 29, (7), pp. 3766–3775.
12. 12)
  - 3. Shi, J., Luo, J., He, X.: ‘Common-duty-ratio control of input-series output-parallel connected phase-shift full-bridge DC-DC converter modules’, IEEE Trans. Power Electron., 2011, 26, (11), pp. 3318–3329.
13. 13)
  - 17. Sha, D., Guo, Z., Liao, X.: ‘Cross-feedback output-current-sharing control for input-series-output-parallel modular DC-DC converters’, IEEE Trans. Power Electron., 2010, 25, (11), pp. 2762–2771.
14. 14)
  - 12. Huang, Y., Tse, C.K., Ruan, X.: ‘General control considerations for input-series connected DC/DC converters’, IEEE Trans. Power Circuit Syst. I, Regul. Pap., 2009, 56, (6), pp. 1286–1296.
15. 15)
  - 1. Choudhary, V., Ledezma, E., Ayyanar, R., et al: ‘Fault tolerant circuit topology and control method for input-series and output-parallel modular DC-DC converters’, IEEE Trans. Power Electron., 2008, 23, (1), pp. 402–411.
16. 16)
  - 21. Liu, M., Zhang, D., Zhou, Z.: ‘Linear regulator design consideration of the serial linear assisted switching converter used as envelope amplifier’, IEEE Trans. Power Electron., 2016, 31, (5), pp. 3673–3689.
17. 17)
  - 7. Chen, W., Wang, G.: ‘Decentralized voltage-sharing control strategy for fully modular input-series–output-series system with improved voltage regulation’, IEEE Trans. Ind. Electron., 2015, 62, (5), pp. 2777–2787.
18. 18)
  - 11. Chen, W., Ruan, X., Yan, H., et al: ‘DC/DC conversion systems consisting of multiple converter modules: stability, control, and experimental verifications’, IEEE Trans. Power Electron., 2009, 24, (6), pp. 1463–1474.
19. 19)
  - 9. Xu, G., Sha, D., Liao, X.: ‘Decentralized inverse-droop control for input-series-output-parallel DC-DC converters’, IEEE Trans. Power Electron., 2015, 30, (9), pp. 4621–4625.
20. 20)
  - 13. Siri, K., Will holl, M., Conner, K.: ‘Uniform voltage distribution control for series connected DC-DC converters’, IEEE Trans. Power Electron., 2007, 22, (4), pp. 1269–1279.
21. 21)
  - 19. Schlecht, M.F.: ‘2004 Input System Instability. SynQor Application Note: PQ-00-05-1. Available at: http://www.synqor.com/documents/appnotes/appnt_System_Instability.pdf.

Input voltage sharing control scheme for input series and output series DC/DC converters using paralleled MOSFETs

References

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