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.
Highlights
LLC series resonant converters [1,2] are widely adapted to consumer or industrial electronics due to their inherent advantages over contending topologies
This paper proposes a new current mode control scheme for LLC series resonant converters, which offers good closed-loop performance for the entire operational region, thereby resolving the problem of the conventional voltage mode control
This paper proposed a new current mode control scheme for LLC series resonant DC-to-DC
Summary
LLC series resonant converters [1,2] are widely adapted to consumer or industrial electronics due to their inherent advantages over contending topologies. The LLC resonant converters were largely employed as an energy-efficient power supply for consumer electronics, such as large-screen TV sets and home appliances [1,3]. The LLC resonant converters find ever increasing applications to more sophisticated and bigger energy conversion systems, primarily due to the high efficiency of the converter. The dynamic analysis and control design of the LLC resonant converters have received increasing research attentions [10,11,12,13,14] because modern energy conversion systems demand good dynamic performance and high reliability for DC-to-DC converters. The purpose of this paper is to develop a new control scheme that could enhance the dynamic performance and reliability of LLC series resonant converters adopted to modern energy conversion systems
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