Е-Публикации
Технически университет - София

Abstract: This study investigates the sensitivity of the Zeta DC-DC converter to variations in the coupling capacitance, a critical component that directly influences energy transfer, transient behavior, and electromagnetic compatibility (EMC). Through a simulation-based approach in MATLAB/Simulink, the impact of realistic manufacturing deviations in the coupling capacitor is evaluated. A series of frequency-domain analyses are conducted by injecting single current pulses at key nodes of the circuit and observing the resulting voltage responses. The variations in the coupling capacitance, modeled within a commercial tolerance step above and below the nominal value, reveal significant changes in resonant peaks, output ripple, and overall system stability. The findings highlight that even small parameter deviations can induce pronounced shifts in dynamic behavior, necessitating conservative component selection and sensitivity-aware design practices. This work emphasizes the importance of small-signal analysis and node-based spectral evaluation in enhancing the robustness and EMI performance of Zeta converter implementations.

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