DEsign of bus Bar Structure in Power Converter Circuitto Obtain Optimized Switching Waveform

In a power converter circuit, it is well known that the bus bar structure affects both surge voltage anc However, the bus bar structure may be one of the causes for the oscillation waveform to induce electromagnetic interference (EMI) issues. This study proposes a design procedure of an optimized bus bar structure. Since the parasitic parameters of the bus bar geometory. such as inductance, capacitance, and resistance, are complicated in the hertz frequency range, the parasitic parameters that have frequency characteristics are analyzed by the finite ek method. The surge voltage and oscillation voltage under a turn-off operation are evaluated by using the bus bar mod-eled as S-parameters. It demonstrated that the optimal bus bar structure can reduce the surge voltage and oscillation. In accordance with the method to design an optimal bus bar. bus bar prototypes are designed, and the experimental results rated at 400 V. 30 A are presented to verify the analysis and simulation. © Institute of Electrical Engineers of Japan. All rights reserved