Pulse width modulation (PWM) converters generate switching common-mode voltages (CMVs) across the load terminals. These voltages cause common-mode currents, leading to bearing failure in motor loads and electromagnetic interference problems. This paper presents a generalized carrier-based PWM technique for open-end winding motor drives that completely eliminates switching CMV. The proposed method is applicable to both dual two-level voltage source inverter and dual matrix converterbased open-end winding drives. Detailed analysis shows that the carrier-based method requires significantly less computation compared to the corresponding space vector implementation. This paper also outlines the relationship between the two implementations. The carrier-based method is shown to achieve superior performance in terms of resource requirements and execution time when implemented on a field-programmable gate array-based real-time control platform. Simulation and experimental results have been presented to validate the proposed method.Index Terms-AC motor drive, carrier-based modulation, common-mode voltage (CMV), dual two-level inverter, dual matrix converter (MC), open-end winding drive, pulse width modulation (PWM).

In vehicle-to-grid applications, the battery charger of the electric vehicle (EV) needs to have a bidirectional power flow capability. Galvanic isolation is necessary for safety. An ac-dc bidirectional power converter with high-frequency isolation results in high power density, a key requirement for an on-board charger of an EV. Dual-active-bridge (DAB) converters are preferred in medium power and high voltage isolated dc-dc converters due to high power density and better efficiency. This paper presents a DAB-based three-phase ac-dc isolated converter with a novel modulation strategy that results in: 1) single-stage power conversion with no electrolytic capacitor, improving the reliability and power density; 2) open-loop power factor correction; 3) soft-switching of all semiconductor devices; and 4) a simple linear relationship between the control variable and the transferred active power. This paper presents a detailed analysis of the proposed operation, along with simulation results and experimental verification.

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This paper presents a carrier based implementation of Space Vector Pulse Width Modulation (SVPWM) of dual matrix converters (MCs) using synchronously rotating vectors. Usage of only synchronously rotating vectors ensures the elimination of differential and average common mode voltages which lead to circulating currents and electromagnetic interference (EMI) problems respectively. The proposed strategy is an alternative way to achieve SVPWM, but it doesn't involve the knowledge of space vectors once it is derived. Also, it avoids any trigonometric and division operations that could be needed to implement the SVPWM using the general space vector approach.