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Increasing LTCC inductance density by using inverse coupling technique and multi-permeability structure

1 Faculty of Electrical and Computer Engineering, Babol Noshirvani University of Technology, Iran
2 Faculty of Engineering, Architecture and Information Technology, University of Queensland, Australia

Topical Section: Power electronics and Power systems

Inductor size is one of the biggest challenges to reduce the size of the portable electronic devices. Several methods are presented for reducing inductor’s size, among which LTCC has a specific significance in low power converters. Given the fact that it does not need any additional control circuits and also by considering its structure and constituent materials, the value of this inductor and its efficiency increases. This paper investigates LTCC inductor with the inverse coupling method in form of a multi-permeability structure. First, the inverse coupling inductor is considered in vertical and lateral flux patterns in the single permeability state and then, these inductors’ behaviors are considered in a multi-permeability structure by optimizing inductor’s core. Ultimately, a new structure in multi-permeability lateral flux inductor is presented which leads to increasing inductance density that is more phenomenal in low currents. Then, the behavior of the proposed inductor is investigated in a buck converter with 1.5 MHz switching frequency. It is observed that power density increases up to 735 (w/in3). Performance accuracy of mentioned inductor is confirmed by simulation in MATLAB and FEA2D FLUX.
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1. Zhou L, Donati M, Amoroso L, et al. (2000) Improved light-load efficiency for synchronous rectifier voltage regulator module. IEEE T Power Electr 15: 826–834.    

2. Chen Y, Lee FC, Amoroso L, et al. (2004) A resonant MOSFET gate driver with efficient energy recovery. IEEE T Power Electr 19: 470–477.    

3. Wei J and Lee FC (2004) Two-stage voltage regulator for laptop computer CPUs and the corresponding advanced control schemes to improve light-load performance. Nineteenth Annual IEEE Applied Power Electronics Conference and Exposition 2: 1294–1300.    

4. Waffenschmidt E, Ackermann B and Ferreira JA (2005) Design method and material technologies for passives in printed circuit board embedded circuits. IEEE T Power Electr 20: 576–584.    

5. Dallago E, Passoni M and Venchi G (2007) Analysis of high-frequency IGBT soft switching buck converter with saturable inductors. IEEE T Power Electr 22: 407–416.    

6. Lim SF and Khambadkone AM (2009) Non linear inductor design for improving light load efficiency of boost PFC. 2009 IEEE Energy Conversion Congress and Exposition, 1339–1346.

7. Harada K and Sakamoto H (1990) Saturable inductor commutation for zero voltage switching in DC-DC converter. IEEE International Magnetics Conference 26: 2259–2261.

8. Wang L, Hu Z, Qiu Y, et al. (2014) A new model for designing multi-hole multi-permeability nonlinear LTCC inductors. 2014 IEEE Applied Power Electronics Conference and Exposition (APEC), 757–762.

9. Lim MH, Van Wyk J and Ngo KD (2007) Modeling of an LTCC inductor capable of improving converter light-load efficiency. APEC 2007-Twenty Second Annual IEEE Applied Power Electronics Conference, 85–89.

10. Su Y, Li Q, Mu M, et al. (2012) Low profile LTCC inductor substrate for multi-MHz integrated POL converter. 2012 Twenty-Seventh Annual IEEE Applied Power Electronics Conference and Exposition (APEC), 1331–1337.

11. Wang L, Pei Y, Yang X, et al. (2011) Design of ultrathin LTCC coupled inductors for compact DC/DC converters. IEEE T Power Electr 26: 2528–2541.    

12. Su Y, Li Q and Lee FC (2013) Design and evaluation of a high-frequency LTCC inductor substrate for a three-dimensional integrated DC/DC converter. IEEE T Power Electr 28: 4354–4364.    

13. Lim MHF, van Wyk JD and Liang Z (2009) Internal geometry variation of LTCC inductors to improve light-load efficiency of DC-DC converters. IEEE T Compon Pack T 32: 3–11.    

14. Li Q and Lee FC (2009) High inductance density low-profile inductor structure for integrated point-of-load converter. 2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition, 1011–1017.

15. Li Q, Dong Y, Lee FC, et al. (2001) High-density low-profile coupled inductor design for integrated point-of-load converters. IEEE T Power Electr 28: 547–554.

16. Wong PL (2001) Performance improvements of multi-channel interleaving voltage regulator modules with integrated coupling inductors.

17. Wang L, Hu Z, Liu YF, et al. (2013) Multipermeability inductors for increasing the inductance and improving the efficiency of high-frequency DC/DC converters. IEEE T Power Electr 28: 4402–4413.    

18. Wang L, Qiu Y, Wang H, et al. (2015) A New Model for Designing Multiwindow Multipermeability Nonlinear LTCC Inductors. IEEE T Ind Appl 51: 4677–4687.    

19. Wang L, Pei Y, Yang X, et al. (2012) A horizontal-winding multi-permeability distributed air-gap inductor," 2012 Twenty-Seventh Annual IEEE Applied Power Electronics Conference and Exposition (APEC), 994–1001.

20. Wang L, Hu Z, Liu YF, et al. (2012) Design of multi-permeability distributed air-gap inductors. 2012 IEEE Energy Conversion Congress and Exposition (ECCE), 3285–3292.

21. Wang L, Pei Y, Yang X, et al. (2012) Improving light and intermediate load efficiencies of buck converters with planar nonlinear inductors and variable on time control. IEEE T Power Electr 27: 342–353.    

© 2018 the Author(s), licensee AIMS Press. This is an open access article distributed under the terms of the Creative Commons Attribution Licese (http://creativecommons.org/licenses/by/4.0)

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