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

Jinhaeng Jang, Syam Kumar Pidaparthy and Byungcho Choi
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Jinhaeng Jang: Power Electronics Team, LG Electronics, Pyungtaek-city, Kyungki-do 451-713, Korea
Syam Kumar Pidaparthy: School of Electronics Engineering, Kyungpook National University, Daegu 702-701, Korea
Byungcho Choi: School of Electronics Engineering, Kyungpook National University, Daegu 702-701, Korea

Energies, 2015, vol. 8, issue 6, 1-16

Abstract: 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.

Keywords: LLC series resonant DC-to-DC converters; current mode control; closed-loop performance; voltage mode control (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2015
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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