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In this paper, two cascaded electrodynamic shakers are supplied by the three-leg inverter. The conventional comparator-based pulse width modulation (PWM) has limited output voltage region due to the common leg. To enlarge the output voltage region and improve the inverter efficiency, the novel multi-dimensional feedback quantized modulation (MDFQM) is used. All the control algorithms are implemented...
The bridgeless power-factor-correction (PFC) converter possesses higher efficiency than the conventional boost-type PFC converter due to its reduced conduction voltage drop and conduction loss. The conventional multiloop control needs to sense the input current to yield the desired sinusoidal current waveform. This paper presents a control method for bridgeless PFC converter to provide sinusoidal...
In a six-switch three-phase inverter, the conventional pulsewidth modulation (PWM) has six switching times in every switching period based on the average concept. The used multidimensional feedback quantized modulation (MDFQM) strategy selects one switching state and keeps it in every sampling period based on the minimization of filtered voltage errors between the desired voltage commands and the...
Recently, the advantage of multiphase drive (>3) is demonstrated by a novel system composed of series-connected five-phase induction motors (IMs) and single inverter where their IM windings are connected in series. Due to the additional degree of freedom provided by five-phase AC motors, two IM speeds can be regulated independently. In this paper, high-efficiency series-connected five-phase permanent...
Compared to the conventional analog-circuit control and linear power amplifier for permanent-magnet electrodynamic shaker (PMEDS), a DSP-based digital current control with switched-mode power amplifier is proposed in this paper. A full-bridge converter is connected directly to PMEDS without LC filter in order to directly regulate the shaker current and simplify the digital current control. To meet...
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