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Motivated by the method to analyze the impact of dead time in hard-switching converters, this paper, for the first time, analyzes the impact of zero-voltage notches on the outputs of soft-switching pulsewidth modulation (PWM) converters. It proves that the output distortion of soft-switching converters due to their deviation voltage is independent of the direction of their output current. Hence, their...
This paper presents an excellent PWM method for power conversion circuits. The proposed method is called a vector frequency modulation (VFM). VFM does not belong to any conventional PWM methods. Although an idea of space voltage vectors is employed, any traditional equations to calculate the periods of the voltage vectors are not used. The voltage vectors are classified into two groups, zero vectors...
This paper presents a dynamic boost converter as input stage for a high efficient double 120deg flattop modulation based three-phase inverter. The boost converter can be regulated with hysteresis control or predictive PWM. The objective of the input stage is to provide a dynamic and accurate current into a pulsating DC-link. The algorithms are verified with simulations and experiments using a prototype...
This paper presents a digital implementation of two-axis position control of microstepping bipolar drive with the controlled current, depending on the load torque applied. The topology of power converter for each motor is the conventional three-phase inverter, using space-vector pulse-width-modulation (PWM) technique. It is well known that the microstepping technique allows the stepping motor rotating...
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