access icon free Study on high robustness and fast dynamic response synchronous rectifier buck converter

© The Institution of Engineering and Technology
Received 06/06/2017, Accepted 14/12/2017, Revised 26/11/2017, Published 22/01/2018

Here, a novel control strategy combined by constant-frequency V 2 control and H ∞ robust control is proposed and tested in a buck converter. The control strategy not only demonstrates the fast transient response of ordinary V 2 control, but also shows strong robustness with different input conditions. The main drawbacks of V 2 control, such as high interference susceptibility and low input perturbation stability margin, can be improved by introducing H ∞ robust strategy into the controller design. During the analysis and design process, the original controlled system based on the V 2 control is modelled at first, then the H ∞ weighting functions are calculated according to the small-signal analysis of V 2 controlled buck converter. After that, the H ∞ robust compensator parameters based on constant-frequency V 2 control are calculated. Finally, a buck converter controlled by the proposed control strategy is built and tested, with 48 V input voltage, 12 V output voltage, and 120 W output power. The experimental results demonstrate the effectiveness of the converter with the proposed control, which also proves the proposed method has great potential for high robustness and fast dynamic response applications.

Inspec keywords: H∞ control; compensation; robust control; transient response; rectifying circuits; control system synthesis; frequency control; power convertors

Other keywords: H∞ robust compensator parameters; voltage 48 V; high robustness fast dynamic response synchronous rectifier buck converter; constant-frequency V2 control; power 120 W; controller design; V2 controlled buck converter; small-signal analysis; fast transient response; voltage 12 V; control strategy; H∞ weighting functions; H∞ robust control

Subjects: Power electronics, supply and supervisory circuits; Frequency control; Optimal control; Stability in control theory; Control system analysis and synthesis methods; Control of electric power systems

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