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This paper proposes a novel single-phase ac to high voltage dc converter based on Cockcroft-Walton cascade rectifier with only adding one bi-directional switch and one boost inductor. This paper also derives a new method of circuit representation for Cockcroft-Walton cascade rectifier, which simplifies the equivalent circuit and is convenient for simulation. Compared with conventional Cockcroft-Walton...
This paper proposes an adaptive backstepping controller design for a position control system of permanent-magnet synchronous motors. The proposed system has been successfully used in a knitting machine with satisfactory performance, including fast transient responses, good steady-state responses, and good tracking ability. Based on properly selecting a Lyapunov function, an adaptive backstepping position...
Digital controller platforms for power electronic converters have typically been based on a single high performance digital processor, often coupled with a programmable logic gate array. The digital processor is usually a digital signal processor (DSP). Often, a highly optimized real-time operating system provides multitasking features for the controller code execution on a single processor core....
Design of DC power supply using half bridge LCC series-parallel resonant converter is proposed in this paper. The DC power supply input voltage is DC 24 V and output voltage is DC 3.3 V. The voltage regulation using variable frequency control is investigated for 3.3 V under different load condition. The performance of the system is first simulated by IsSpice. A 16-bit digital signal processor (DSP...
This paper presents a simplified space vector pulse width modulation (SVPWM) strategy with the optimized switching sequence for multilevel inverter. An n-level inverter will be equivalent to n-1 two-level inverters using the proposed concept of the equivalent inverter. Through the redistribution of the space vector plane and the establishment of vector decomposition rules, the space vector plane and...
This paper applies the selective harmonic elimination (SHE) technique to determine the switching angles for a multilevel inverter that cooperated with specially connected transformer, zig-zag connection. With the ability to direct controlling harmonics, SHE technique has the adaptability to associate with apparatus which are congenitally immune to specific harmonics, such as the zig-zag connection...
Primary-side sensing (PSS) technique can be used for the output voltage or current regulation by employing an auxiliary winding. However, the sensed voltage may be corrupted by switching noise due to leakage inductance, winding resistance, and nonlinearity of the magnetic core, therefore the sensed voltage can only achieve limited accuracy. With the advance of power control IC realization technology,...
This paper proposes an adaptive inverse controller design for a micro-permanent magnet synchronous motor control system. The adaptive inverse controller is constructed by using an adaptive model and an adaptive controller. The parameters of the adaptive model and adaptive controller are on-line tuned. By using a state estimator, the speed signal is obviously improved. In addition, the control system...
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