Hoffmann M, Schwanninger R, März M (2025)
Publication Status: Submitted
Publication Type: Unpublished / Preprint
Future Publication Type: Journal article
Publication year: 2025
Publisher: TechRxiv
DOI: 10.36227/techrxiv.176472799.99325875/v1
This paper presents a compact, measurement-calibrated framework to model and certify stability of voltage-sense current-cancellation (VSCC) active common-mode (CM) filters for direct-current (DC) grids. We develop a closed-loop description that includes a non-ideal operational amplifier with finite output resistance, a frequency-dependent line impedance stabilization network (LISN), and sensing and injection paths. The formulation unifies transfer function and one-port admittance views, so that stability can be judged at a single interconnection port. The proposed analytical model enables a detailed characterization of the system's dynamic behavior, allowing for targeted design optimizations prior to physical prototyping. We validate the model against hardware measurements from 100 Hz to 10 MHz using two network analyzers, observing close agreement. While pole-zero inspection can be employed for full system knowledge, typical methods for stability estimation with partial system knowledge are too conservative or inconclusive for this topology. Consequently, we have to deploy a Nyquist test on the measured total admittance as a necessary and sufficient bench procedure that certifies stability without a detailed analytical model and directly guides impedance shaping. The result is a traceable one-port measurement-based assessment that shortens design cycles and reduces the risk of electromagnetic-interference compliance in compact DC power systems.
APA:
Hoffmann, M., Schwanninger, R., & März, M. (2026). Stability Considerations of Voltage-Sense Current-Cancellation Active Common Mode Filters in DC Grids. (Unpublished, Submitted).
MLA:
Hoffmann, Madlen, Raffael Schwanninger, and Martin März. Stability Considerations of Voltage-Sense Current-Cancellation Active Common Mode Filters in DC Grids. Unpublished, Submitted. 2026.
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