Switched-inductor technique is a duality counterpart of the conventional switched-capacitor technique. On the other hand, the duality principle is also a useful technique for power converter topology study that is now illustrated by a duality between conventional switched-capacitor and the switched-inductor. The basic switched-inductor converters with current conversions 2, 1/2 and −1 are derived using the duality principle to basic switched-capacitor converters. The operation principle and conversion method have been illustrated in detail. High order of current conversion is also illustrated using the switched-inductor concept. For high step-down version, only two transistors are needed. For high step-up version, the number of transistors is equal to the step-up conversion ratio. Simulation and experimental tests have confirmed the proposed new concept of power conversion. This study presents a useful study guideline to the switching techniques, current sharing and the duality principle for the converters. The converters find applications to power up current-based loads such as light-emitting diode in a digitised manner. The circuits can also be used to provide conversion for current source such as photovoltaic to give multiple or fractional current output. Current mode controlled electrical machine can also be realised easily by the proposed circuit.

References

1. 1)
  - A. Ioinovici . Switched-capacitor power electronics circuits. IEEE Proc. Circuits Syst. Mag. , 3 , 37 - 42
2. 2)
  - 20. Wei, K., Lixia, Z., Yansong, W.: ‘Study on output characteristic of bi-direction current source converters’, IET Power Electron., 2012, 5, (7), pp. 929–934 (doi: 10.1049/iet-pel.2011.0267).
3. 3)
  - 3. Cheng, K.W.E., Evans, P.D.: ‘Parallel-mode extended-period quasi resonant convertor’, IEE Proc. B, 1991, 138, (5), pp. 243–251.
4. 4)
  - 19. Makowski, M.S.: ‘On topological assumptions on PWM converters – a reexamination’. IEEE Power Electronics Specialists Conf., 1993, pp. 141–147.
5. 5)
  - 28. Cuk, S., Middlebrook, R.D.: ‘Advances in switched-mode power conversion Part II’, IEEE Trans. Ind. Electron., 1983, IE-30, (1), pp. 19–29 (doi: 10.1109/TIE.1983.356698).
6. 6)
  - 2. Abramovitz, A.: ‘An approach to average modeling and simulation of switch-mode systems’, IEEE Trans. Educ., 2011, 54, (3), pp. 509–517 (doi: 10.1109/TE.2011.2146784).
7. 7)
  - 23. Wu, M.-T., Lin, C.-L., Lin, C.-C., Chung, L.-P.: ‘Stabilising current driver for high-voltage light-emitting diodes’, IET Power Electron., 2014, 7, (4), p. 1024 (doi: 10.1049/iet-pel.2013.0480).
8. 8)
  - 18. Cheng, K.W.E.: ‘Overview of the DC power conversion and distribution’, Asian Power Electron. J., 2008, 2, (2), pp. 75–82.
9. 9)
  - 14. Yuanmao, Y., Cheng, K.W.E.: ‘Level-shifting multiple-input switched-capacitor voltage copier’, IEEE Trans. Power Electron., 2012, 27, (2), pp. 828–837 (doi: 10.1109/TPEL.2011.2155672).
10. 10)
  - B. Axelrod , Y. Berkovich , A. Ioinovici . A cascade boost-switched-capacitor-converter – two level inverter with an optimized multilevel output waveform. IEEE Trans. Circuits Syst. I , 12 , 2763 - 2770
11. 11)
  - B. Axerlrod , Y. Berkovich , S. Tapuchi , A. Ioinovici . Single-stage single-switch switched-capacitor buck/buck-boost-type converter. IEEE Trans. Aerosp. Electron. Syst. , 2 , 419 - 430
12. 12)
  - 4. Cheung, C.-K., Tan, S.-C., Tse, C.K., Ioinovici, A.: ‘On energy efficiency of switched-capacitor converter’, IEEE Trans. Power Electron., 2013, 28, (2), pp. 862–876 (doi: 10.1109/TPEL.2012.2204903).
13. 13)
  - F.L. Luo , H. Ye . Positive output multiple-lift push–pull switched-capacitor Luo-converters. IEEE Trans. Ind. Electron. , 3 , 594 - 602
14. 14)
  - 6. Cid-Pastor, A., Martínez-Salamero, L., Leyva, R., Calvente, J., Giral, R.: ‘Design of photovoltaic-based current sources for maximum power transfer by means of power gyrators’, IET Power Electron., 2011, 4, (6), pp. 674–682 (doi: 10.1049/iet-pel.2010.0190).
15. 15)
  - 27. Kim, M.-Y., Kim, C.-H., Kim, J.-H., Moon, G.-W.: ‘A chain structure of switched capacitor for improved cell balancing speed of lithium-ion batteries’, IEEE Trans. Ind. Electron., 2014, 61, (8), pp. 3989–3999 (doi: 10.1109/TIE.2013.2288195).
16. 16)
  - Y.P. Yeung , K.W.E. Cheng , D. Sutanto , S.L. Ho . Zero-current switching switched-capacitor quasi-resonant step-down converter. IEE Proc. Electr. Power Appl. , 2 , 111 - 121
17. 17)
  - 21. Noguchi, T.: ‘Common-emitter topology of multilevel current-source pulse width modulation inverter with chopper-based dc current sources’, IET Power Electron., 2011, 4, (7), pp. 759–766 (doi: 10.1049/iet-pel.2010.0008).
18. 18)
  - K.K. Law , K.W.E. Cheng , Y.P.B. Yeung . Design and analysis of switched-capacitor based step-up resonant converters. IEEE Trans. Circuit Syst. I , 4 , 943 - 945
19. 19)
  - Y.P. Yeung , K.W.E. Cheng , D. Sutanto . Investigation of multiple output operation for switched-capacitor resonant converters. Int. J. Circuits Theory Appl. , 4 , 411 - 423
20. 20)
  - B. Axelrod , Y. Berkovich , A. Ioinovici . Switched-capacitor/switched-inductor structures for getting transformerless hybrid DC–DC PWM converters. IEEE Trans. Circuits Syst. I , 2 , 687 - 696
21. 21)
  - K.W.E. Cheng . Zero-current-switching switched-capacitor converters. IEE Proc. Electr. Power Appl. , 403 - 409
22. 22)
  - K.W.E. Cheng , P.D. Evans . Unified theory of extended-period quasi-resonant converters. IEE Proc. Electr. Appl. , 2 , 119 - 130
23. 23)
  - R.L. Steigerwald . A comparison of half-bridge resonant converter topologies. IEEE Trans. Power Electron. , 2
24. 24)
  - K.H. Liu , O. Ramesh , F.C.Y. Lee . Quasi-resonant converters topology and characteristics. IEEE Trans. Power Electron. , 1 , 62 - 71
25. 25)
  - K.K. Law , K.W.E. Cheng . Examination of the frequency modulation and lifting techniques for the generalized power factor correction switched-capacitor resonant converter. Int. J. Circuit Theory Appl. , 7 , 839 - 855
26. 26)
  - 7. Tan, S.-C., Kiratipongvoot, S., Bronstein, S., Ioinovici, A., Lai, Y.M., Tse, C.K.: ‘Adaptive mixed on-time and switching frequency control of a system of interleaved switched-capacitor converters’, IEEE Trans. Power Electron., 2011, 26, (2), pp. 364–380 (doi: 10.1109/TPEL.2010.2060497).
27. 27)
  - 15. Ye, Y., Cheng, K.W.: ‘Multi-port voltage-subtracting circuit based on resonant switched-capacitor’, IET Power Electron., 2012, 5, (6), pp. 693–701 (doi: 10.1049/iet-pel.2011.0049).

Duality approach to the study of switched-inductor power converters and its higher-order variations

References

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