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This paper presents a modular multilevel dc-dc converter (MMC) with zero-current switching (ZCS) feature and its analysis for medium-voltage direct current (MVDC) applications. The main focus of this paper is analyzing the overall efficiency of the proposed MMC and experimentally verifying the theoretical analysis on operating principle. Furthermore, in order to achieve high efficiency, the proposed...
Wide bandgap (WBG) semiconductor devices allow power electronic converters to achieve higher efficiency, higher power density and potentially higher reliability. However, the design challenges accompanied by applying the new WBG devices have risen accordingly. In this paper, a non-isolated bidirectional DC-DC converter equipped with Gallium Nitride (GaN) semiconductor transistors is presented. The...
Direct bypass of DC-DC boost converter in traction inverter has many advantages including increased efficiency and pass-through capability. This paper explains different practical aspects of direct bypass of the boost stage of traction inverter using diode. Bypass diode enters into the linear operating region (DC Q-point) when the battery discharges through the bypass diode to drive the electric motors...
An online method of measuring battery AC impedance spectrum is presented in this paper. By adding a square wave perturbation to the steady-state value of the duty cycle of a boost power converter, AC impendence values can be devised from the responses of the battery voltage and current at the odd harmonics of the perturbation frequency. FFT analysis is applied to battery voltage and current to obtain...
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