期刊
SENSORS
卷 23, 期 14, 页码 -出版社
MDPI
DOI: 10.3390/s23146512
关键词
current measurement; power integrated circuits; gallium nitride; HEMTs; AC motor drives; three-phase DC-AC inverters; wide-bandgap semiconductors; current mirrors; brushless motors; equivalent circuits; substrates
A three-phase GaN-based motor inverter IC with integrated phase current mirror sensors, a temperature sensor, and an amplifier was presented and tested. The IC operated successfully with space-vector pulse width modulation, and a bidirectional measurement capability was verified. The capacitive coupling from the three switch-nodes to the substrate was analyzed and experimentally confirmed to have four discrete semi-floating substrate voltage levels.
A three-phase GaN-based motor inverter IC with three integrated phase current mirror sensors (sense-FETs or sense-HEMTs, 1200:1 ratio), a temperature sensor, and an amplifier is presented and experimentally operated. The three low-side currents are read out by virtual grounding transimpedance amplifiers. A modified summed DC current readout circuit using only one amplifier is also discussed. During continuous 24 V motor operation with space-vector pulse width modulation (SVPWM), the sensor signal is measured and a bidirectional measurement capability is verified. The measured risetime of the sensor signal is 51 ns, indicating around 7 MHz bandwidth (without intentional optimization for high bandwidth). The IC is operated up to 32 V on DC-biased semi-floating substrate to limit negative static back-gating of the high-side transistors to around -7% of the DC-link voltage. Analysis of the capacitive coupling from the three switch-nodes to the substrate is calculated for SVPWM based on capacitance measurement, resulting in four discrete semi-floating substrate voltage levels, which is experimentally verified. Integrated advanced power converter topologies with sensors improve the power density of power electronics applications, such as for low-voltage motor drive.
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