Design Of Switching Current Sensor For Three-Phase Sic Inverter
2021 THIRTY-SIXTH ANNUAL IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION (APEC 2021)(2021)
Abstract
This paper proposes an offset compensation method of the switching current sensor for the current control of the three-phase SiC inverter. Switching current sensors with Rogowski coils, which have analog signal processing circuits implemented with the operational amplifier (op amp), are integrated into the four-layer PCB gate drive board; in the end, the phase currents are reconstructed with the op amp subtractor. To eliminate the op amp offset voltage and bias current effect on the sensor output, an offset compensation S/W algorithm is proposed. A three-phase SiC inverter prototype was built and tested with the three-phase load to verify the feasibility of the method.
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Key words
Rogowski coil, Switching current sensor, SiC inverter, op amp, Offset voltage, Bias current
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