Your browser does not support JavaScript!
http://iet.metastore.ingenta.com
1887

access icon free Step-charging technique for CC/CV mode battery charging with low-cost control components in IPT systems

© The Institution of Engineering and Technology
Received 23/05/2018, Accepted 04/10/2018, Revised 17/09/2018, Published 12/10/2018

In wireless power transfer technology, power control technique is required to realise constant current (CC) and constant voltage (CV) modes for battery charging. CC and CV modes are needed to effectively charge lithium (Li)-ion batteries to ensure long life span and maximum capacity utilisation. The use of additional battery charging circuitry reduces efficiency, increases volume, and increases circuit complexity. The frequency modulation method is a method that can control power without an additional charging circuit, but a high-resolution controller is needed to control the voltage and current for charging the battery by frequency modulation. This study proposes a system that controls current and voltage for CC and CV modes through a step-charging method using a battery hysteresis with a low-cost control system. The in-band communication circuit is analysed and used to link the primary and secondary sides of the inductive power transfer (IPT) coils, which enables effective feedback control without an additional wireless communication module. This method enables high-efficiency charging while minimising the overall size and cost of mobile IPT applications such as power tools. The proposed system shows 90.3% transfer efficiency with a 20.75 V, 4 Ah Li-ion battery at 7 mm distance.

Inspec keywords: feedback; inductive power transmission; power transmission control; secondary cells; power control

Other keywords: IPT systems; CC/CV mode battery; low-cost control system; power control technique; transfer efficiency; additional charging circuit; mobile IPT applications; battery charging circuitry; wireless power transfer technology; lithium-ion batteries; circuit complexity; power tools; in-band communication circuit; wireless communication module; voltage 20.75 V; high-efficiency charging; step-charging technique; current voltage; battery hysteresis; long life span; Li-ion battery; step-charging method; frequency modulation method; inductive power transfer coils; high-resolution controller; low-cost control components; maximum capacity utilisation; effective feedback control

Subjects: Wireless power transmission; Power and energy control; Secondary cells; Control of electric power systems

References

    1. 1)
      • 18. Bosshard, R., Kolar, J.W., Wunsch, B.: ‘Control method for inductive power transfer with high partial-load efficiency and resonance tracking’. Proc. Int. Power Electronics Conf., Hiroshima, Japan, 18–21 May 2014, pp. 2167–2174.
    2. 2)
      • 15. Mai, R., Chen, Y., Li, Y., et al: ‘Inductive power transfer for massive electric bicycles charging based on hybrid topology switching with a single inverter’, IEEE Trans. Power Electron., 2017, 32, (8), pp. 5897–5906.
    3. 3)
      • 7. Na, K., Jang, H., Ma, H., et al: ‘Tracking optimal efficiency of magnetic resonance wireless power transfer system for biomedical capsule endoscopy’, IEEE Trans. Microw. Theory Tech., 2015, 63, (1), pp. 295–304.
    4. 4)
      • 9. Li, Q., Liang, Y.C.: ‘An inductive power transfer system with high-Q resonant tank for mobile device charging’, IEEE Trans. Power Electron., 2015, 30, (11), pp. 6203–6212.
    5. 5)
      • 20. Huang, Z., Wong, S., Tse, C.K.: ‘Design of a single-stage inductive-power-transfer converter for efficient EV battery charging’, IEEE Trans. Veh. Technol., 2015, 66, (7), pp. 5808–5821.
    6. 6)
      • 1. Li, S., Chris, C.: ‘Wireless power transfer for electric vehicle applications’, IEEE J. Emerg. Sel. Top. Power Electron., 2018, 3, (1), pp. 4–17.
    7. 7)
      • 19. Ahn, D., Hong, S.: ‘Wireless power transfer resonance coupling amplification by load-modulation switching controller’, IEEE Trans. Ind. Electron., 2015, 62, (2), pp. 898–909.
    8. 8)
      • 10. Galizzi, M., Caldara, M., Re, V., et al: ‘A novel Qi-standard compliant full-bridge wireless power charger for low power devices’. Proc. IEEE Wireless Power Transfer (WPT), Perugia, Italy, May 2013, pp. 44–47.
    9. 9)
      • 6. Si, P., Hu, A.P., Malpas, S., et al: ‘A frequency control method for regulating wireless power to implantable devices’, IEEE Trans. Biomed. Circuits Syst., 2008, 2, (1), pp. 22–29.
    10. 10)
      • 14. Qu, X., Han, H., Wong, S., et al: ‘Hybrid IPT topologies with constant current or constant voltage output for battery charging applications’, IEEE Trans. Power Electron., 2015, 30, (11), pp. 6329–6337.
    11. 11)
      • 21. Li, X., Tsui, C.Y., Ki, W.H.: ‘Wireless power transfer system using primary equalizer for coupling- and load-range extension in bio-implant application’. IEEE Int. Solid-State Circuits Conf. (ISSCC), San Francisco, CA, USA, 22–26 February 2015, pp. 210–228.
    12. 12)
      • 13. ‘WPC v1.2 wireless power transmitter manager with 15 W power delivery, bq501210’. Available at http://www.ti.com/lit/ds/symlink/bq501210.pdf, accessed 21 May 2018.
    13. 13)
      • 11. Buja, G., Bertoluzzo, M., Mude, K.N.: ‘Design and experimentation of WPT charger for electric city car’, IEEE Trans. Ind. Electron., 2015, 62, (12), pp. 7436–7447.
    14. 14)
      • 17. Chen, R., Zheng, C., Zahid, Z.U., et al: ‘Analysis and parameters optimization of a contactless IPT system for EV charger’. Proc. IEEE Applied Power Electronics Conf. Exposition, Fort Worth, TX, USA, 16–20 March 2014, pp. 1654–1661.
    15. 15)
      • 5. Tang, S.C., Lun, T.L.T., Guo, Z., et al: ‘Intermediate range wireless power transfer with segmented coil transmitters for implantable heart pumps’, IEEE Trans. Power Electron., 2017, 32, (5), pp. 3844–3857.
    16. 16)
      • 16. Steigerwald, R.L.: ‘A comparison of half-bridge resonant converter topologies’, IEEE Trans. Ind. Electron., 1988, 3, (2), pp. 174–182.
    17. 17)
      • 8. Jang, Y., Jovanovic, M.M.: ‘A contactless electrical energy transmission system for portable-telephone battery chargers’, IEEE Trans. Ind. Electron., 2003, 50, (3), pp. 520–527.
    18. 18)
      • 12. Hwang, J.T., Lee, D.S., Lee, J.H., et al: ‘An all-in-one (Qi, PMA and A4WP) 2.5 W fully integrated wireless battery charger IC for wearable applications’. IEEE Int. Solid-State Circuits Conf. (ISSCC), San Francisco, CA, USA, 31 January–4 February 2016, pp. 378–380.
    19. 19)
      • 4. Li, W., Zhao, H., Li, S., et al: ‘Integrated LCC compensation topology for wireless charger in electric and plug-in electric vehicles’, IEEE Trans. Ind. Electron., 2015, 62, (7), pp. 4215–4225.
    20. 20)
      • 2. Sallan, J., Villa, J.L., Llombart, A., et al: ‘Optimal design of ICPT systems applied to electric vehicle battery charge’, IEEE Trans. Ind. Electron., 2009, 56, (6), pp. 2140–2149.
    21. 21)
      • 3. Zheng, C., Lai, J., Chen, R., et al: ‘High-efficiency contactless power transfer system for electric vehicle battery charging application’, IEEE J. Emerg. Sel. Top. Power Electron., 2015, 3, (1), pp. 65–74.
http://iet.metastore.ingenta.com/content/journals/10.1049/iet-pel.2018.5450
Loading

Related content

content/journals/10.1049/iet-pel.2018.5450
pub_keyword,iet_inspecKeyword,pub_concept
6
6
Loading
Print this page
This is a required field
Please enter a valid email address