A) This reference design reduces system cost and enables a compact design for isolated phase current and DC-Link voltage measurement in three-phase inverters, while achieving high bandwidth and sensing accuracy. The output of the isolated amplifiers is interfaced to the internal ADC of the MCU using a differential-to-single-ended circuit.
Set up the hardware as outlined in Figure 16. On the powerSUITE page, select Closed Voltage and Current Loop under Project Options. Select AC for output. Select SDFM for sensing if available on the design. Enter 60 Hz for frequency for the AC waveform. This will be the frequency of the inverter output.
Key System Specifications A typical inverter comprises of a full bridge that is constructed with four switches, which can be modulated using pulse width modulation (PWM), and a filter for the high-frequency switching of the bridge, as shown in Figure 1.
The full scale that can be measure is 1026 V. The measurement is done by applying a DC-Link voltage between 50 V to 1000 V. During this test, the inverter is running and the motor is disconnected, which brings a switching frequency of 16 kHz. The uncalibrated error is observed to be ±1% throughout the measurement range. Figure 16.
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