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Current-Mode and Voltage-Mode Control

D26.3 - Discrete-Time Multivariable PID Design in Voltage-Mode Boost Converters for Enhanced Performance and Stability

Thursday, March 26, 2026
12:00 PM - 1:45 PM CT
Location: Hemisfair Ballroom
Designing PID control for a voltage mode controlled (VMC) boost converter using linear small-signal models is inherently challenging due to the presence of right-half-plane (RHP) zero and complex poles in the control-to-output transfer function (TF), which restrict bandwidth (BW) and phase margin (PM), limiting performance across a wide load range. While digital VMC (DVMC) enables real-time optimization, however, sampling delays further degrade the stability margin. This digest presents a discrete-time (DT) multivariable-based PID tuning approach using an augmented DT small-signal model (SSM), which enables BW extension and ensures well-damped, load-invariant transient performance with improved PM. Thereafter, a hybrid multivariable PID tuning approach is introduced, incorporating time- and state-driven switching to enhance dynamic recovery during transients and start-up, while shaping the closed-loop output impedance. Comprehensive design guidelines are provided, with simulation and experimental results validating the technique’s superior transient performance and robustness across a wide load range.