Abstract
In this paper, a novel critical-conduction-mode (CRM)-based soft-switching modulation technique for three-phase inverters is extended from unity to non-unity power factor operating conditions. Zero-voltage-switch (ZVS) soft switching is still achievable with this modulation at non-unity power factor operating conditions, which is especially beneficial for silicon-carbide (SiC)-based systems at high switching frequency operation in order to achieve both high power density and high efficiency. Differences in operation modes between unity and non-unity power factor operating conditions are analyzed and a generalized modulation concept is summarized which covers both unity and non-unity power factor operating conditions. All the control functions are implemented digitally with one low-cost microcontroller (MCU). This modulation concept is verified in simulations and also experimentally implemented on a 25-kW SiC-based three-phase inverter prototype with 127 W/in3 power density.
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