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Technical Lecture

Single and Multi-Phase Inverters

T34.4 - Modified Space Vector Modulation with Low Bandwidth Sensor to Reduce Losses in Soft Switching Three-Phase Inverters

Thursday, March 20, 2025
11:10 AM – 11:30 AM ET
Location: Level Three, A311
Existing Space Vector Modulation Zero Voltage Switching Topology (SVM-ZVS) offers simple control for DC-link resonant three phase converters but suffers from lower efficiency due to hard switching when one of the phase currents becomes zero or close to zero. Moreover, SVM-ZVS topology does not correctly address the delay issues that come from the controller implementation and sensors, which are critical for maintaining soft-switching. This paper proposes a Modified Space Vector Modulation Zero Voltage Switching (MSVM-ZVS) to reduce the losses due to the small phase current levels. Moreover, the proposed MSVM-ZVS also properly addresses the delay issues and can maintain soft-switching even if zero-crossing current is not properly detected, which enables the use of low bandwidth, low cost sensors. The MSVM-ZVS has been verified in simulation, and it is observed that the proposed topology works better than SVM-ZVS in terms of efficiency and the current stress of the switches. Simulation results shows the efficacy of the proposed modulation scheme.