Shashidhar Mathapati

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—The switching frequency of an inverter under direct torque control is mainly decided by the flux-and torque-controller output switching counts. It is known that, with fixed hysteresis bands, the switching frequency varies as the operating point changes. It is possible, however, to keep the switching frequency constant by the adaptation of hysteresis bands.(More)
A delta-sigma modulator converts an analog input signal into a high-frequency stream of single bits with out-off band noise. A high-resolution signal is extracted from the bit-stream with an appropriate low pass filter. The paper emphasizes on the utilization of SincK-filters as low pass filter and proposes a sampling method that is synchronized with the(More)
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