Self-Synchronized Multifrequency Plant Measurement of a Boost Converter

Conference: PCIM Conference 2025 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
05/06/2025 - 05/08/2025 at Nürnberg, Germany

doi:10.30420/566541412

Proceedings: PCIM Conference 2025

Pages: Language: englishTyp: PDF

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Authors:
Roesel, Sophia; Breidenstein, Daniel; Duerbaum, Thomas

Abstract:
The design of analog controllers for DC-DC converters requires their small-signal plant. It is commonly measured by a gain-phase analyzer, performing a time-consuming frequency sweep. To reduce measurement time, this paper proposes a faster, self-synchronized multifrequency excitation method. A microcontroller detects the edges of the PWM-signal and – in each period – injects a new perturbation bit to the feedback-path. Measurement of the output voltage and control signal in time domain deliver the transfer function when compensating the aliasing effects. The measurement results for a boost converter, performed with multiple common binary excitation signals, show excellent agreements with the conventional sine sweep.