access icon free Discrete pulse frequency modulation control with sliding-mode implementation on LLC resonant DC/DC converter via input–output linearisation

© The Institution of Engineering and Technology
Received 22/05/2013, Accepted 21/09/2013, Revised 22/08/2013, Published 06/01/2014

In this study, a novel discrete pulse frequency modulation with sliding-mode control (SMC) implementation of LLC resonant converter is proposed. SMC is employed to cope with the variable dynamic characteristics of LLC resonant converter. The control-oriented dynamic model is first developed by extended describing function method. In order to achieve an optimised output voltage dynamic response, the sliding surface is derived based on the input–output linearisation concept. The proposed sliding-mode controller provides inherent strong robustness against the dynamic drift issues. Meanwhile, the digital SMC signal is insensitive to the non-linear parasitic capacitor of optocoupler. Furthermore, the dynamic performances are significantly improved for the applications of strict dynamic requirements. The theoretical analysis and the attractive dynamic performance are verified by simulation and experimental results.

Inspec keywords: pulse frequency modulation; power capacitors; linearisation techniques; variable structure systems; DC-DC power convertors; resonant power convertors; dynamic response

Other keywords: control-oriented dynamic model; input-output linearisation; extended describing function method; dynamic drift issues; discrete pulse frequency modulation control; input-output linearisation concept; output voltage dynamic response optimization; digital SMC signal; SMC; sliding-mode control implementation; LLC resonant DC-DC converter; strong robustness; variable dynamic characteristics; optocoupler nonlinear parasitic capacitor

Subjects: Control system analysis and synthesis methods; Power electronics, supply and supervisory circuits; Multivariable control systems; Control of electric power systems; Nonlinear network analysis and design; Modulation and coding methods; Capacitors

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