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Energies 2015, 8(6), 6098-6113;

Current Mode Control for LLC Series Resonant DC-to-DC Converters

Power Electronics Team, LG Electronics, Pyungtaek-city, Kyungki-do 451-713, Korea
School of Electronics Engineering, Kyungpook National University, Daegu 702-701, Korea
This paper is an extended version of our paper published in 2011 IEEE Applied Power Electronics Conference, Fort Worth, TX, USA, 6–11 March 2011; pp. 21–27.
Author to whom correspondence should be addressed.
Academic Editor: Paul Stewart
Received: 23 April 2015 / Revised: 29 May 2015 / Accepted: 11 June 2015 / Published: 18 June 2015
Full-Text   |   PDF [1136 KB, uploaded 18 June 2015]


Conventional voltage mode control only offers limited performance for LLC series resonant DC-to-DC converters experiencing wide variations in operational conditions. When the existing voltage mode control is employed, the closed-loop performance of the converter is directly affected by unavoidable changes in power stage dynamics. Thus, a specific control design optimized at one particular operating point could become unacceptable when the operational condition is varied. This paper presents a new current mode control scheme which could consistently provide good closed-loop performance for LLC resonant converters for the entire operational range. The proposed control scheme employs an additional feedback from the current of the resonant tank network to overcome the limitation of the existing voltage mode control. The superiority of the proposed current mode control over the conventional voltage mode control is verified using an experimental 150 W LLC series resonant DC-to-DC converter. View Full-Text
Keywords: LLC series resonant DC-to-DC converters; current mode control; closed-loop performance; voltage mode control LLC series resonant DC-to-DC converters; current mode control; closed-loop performance; voltage mode control
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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MDPI and ACS Style

Jang, J.; Pidaparthy, S.K.; Choi, B. Current Mode Control for LLC Series Resonant DC-to-DC Converters. Energies 2015, 8, 6098-6113.

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