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1887

access icon free Robust integral controllers for high-order class-D power amplifiers

© The Institution of Engineering and Technology
Received 15/06/2017, Accepted 22/11/2017, Revised 24/10/2017, Published 29/11/2017

This study presents variable structure system theory based robust integral controllers for class-D power amplifiers. These amplifiers are highly efficient switching type power amplifiers with negligible losses. Sensorless and current feedback based integral controllers with sliding modes are designed to provide robust tracking performance with negligible phase delays and distortions. The methods are capable of providing high-quality outputs by maximising gain and minimising the tracking error and phase shifts. The validity, feasibility and robustness performance of the controllers are investigated through circuit realisations.

Inspec keywords: power amplifiers; control system synthesis; electric current control; variable structure systems; power control; robust control

Other keywords: phase shift minimization; variable structure system theory; high-order class-D power amplifier; robust tracking performance; robust integral controller; current feedback based integral controller; tracking error minimization; switching type power amplifier; sensorless based integral controller

Subjects: Current control; Amplifiers; Multivariable control systems; Stability in control theory; Control system analysis and synthesis methods; Power and energy control

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