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Small-Signal Modeling and Dynamic Analysis of a Novel ZVZCS Three-Level Converter

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3 Author(s)
Sanzhong Bai ; Sch. of Electr., Electron. & Commun. Eng., Holon Inst. of Technol. ; Nianci Huang ; Ioinovici, A.

The cyclically switching operation of a novel zero-voltage-zero-current-switching three-level converter is briefly presented. Based on a steady-state time-domain analysis of each equivalent switching topology, an average model is obtained. Small-signal open-loop ac line-to-output, control-to-output, and output-current-to-output-voltage transfer functions are deducted. The stability, gain margin, and phase margin of the open-loop transfer functions are studied. After designing the closed loop, the study of the audiosusceptibility and closed-loop output impedance allows for a dynamic analysis: the transient responses to changes in the input voltage and load current are obtained. The results got from the small-signal modeling are compared and confirmed by those obtained by PSPICE simulation and those measured in the laboratory, on an experimental converter of 4.5 kW

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Circuits and Systems I: Regular Papers, IEEE Transactions on  (Volume:53 ,  Issue: 9 )