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In this paper, analysis and design for a dual-boost single-phase active power factor corrector with one cycle control (OCC) is presented. The dual boost topology combines rectification and power factor correction (PFC) together. Only one of the two power switches is operated respectively during each positive or negative half line cycles. The controller employs the one-cycle-control strategy, which...
To reduce the stray inductance, consequently the turn-off voltage spike is a key factor for the implementation of high power switching converter. A structure of low/noninductive bus bar with two conductive layers (positive and negative pole of the DC bus), piled together with one high-level insulating epoxy layer, several connection and support parts, and easy to machining is studied in detail. The...
Two novel methods, digital calculation based on Callahan algorithm and dynamic simulation based on MATLAB/SIMULINK software, are proposed in this paper to study the electromagnetic transient process caused by asynchronous energization of electric power transformer while taking non-linearity into consideration. The effectiveness and accuracy of the results are verified by each other. Then regularity...
In this paper, analytical functions for output torque and rotor flux of indirect vector controlled induction motor are defined and analyzed. According to the defined functions, the effect of parameter variations over outputs of vector controller can be determined. Matlab/simulink based simulations is carried out to confirm the results of the analytical functions
As bearingless motors have all advantages of magnetic bearings, they play an important role in solving difficult problems of special electric drives. The simplest and most versatile form of bearingless motor is the bearingless slice rotor motor. This kind of motor with centrifugal pump has a wide range of applications in life science, chemical processing industry, semiconductor manufacturing industry,...
Based on the characteristics of transverse flux permanent magnet machine (TFPM), a novel multi-pole and multi-phase TFPM topology with assembled stator and concentrated flux rotor is presented in this paper. The associated electromagnetic fields of the prototype are investigated by means of three dimension equivalent magnetic network method (3DEMNM). It is shown the unique multi-phase structure of...
An improved boost DC-DC converter meeting the requirements of intrinsic safety is presented. The maximum values of output short-circuit discharged energy (OSDE) in CCM and DCM are analyzed, respectively. It is pointed out that the OSDE of a boost converter is the summation of the energy from the source and the inductor and the energy stored in the capacitor. It is proved that the maximal value of...
A new modeling approach for the metal halide (abbrev. MH) lamp has been put forward in this paper. Our works focus on the followings: (1) Based on the low frequency behaviors of MH lamp, a new model for the MH lamp has been proposed. This model is simple but very useful; (2) The voltage waveform of the lamp is not sinusoid but looks like a square waveform, a method for estimating the voltage value...
An Hinfin robust controller based on local feedback recurrent neural network (RNN) is proposed for the position tracking control of the permanent magnet linear synchronous motor (PMLSM). The proposed local feedback RNN with a simple-architecture is employed to estimate dynamic mapping of lumped element uncertainty. Based on the result of RNN, the quadric form function of the Hinfin robust controller...
In this paper, a small signal model of a novel ZVZCS FB-PWM DC/DC converter is built and analyzed. A double closed loop controller is employed: the inner loop is a PI controller and the outer loop is a fuzzy logic with integrator controller. The novel control strategy improves the performance of the converter greatly, such as stability, control precision and dynamic response. The dramatic feature...
A new GTO structure called the injection efficiency controlled GTO (IEC-GTO) is proposed, and its anode injection efficiency can be controlled via an additional thin oxide layer located in short anode contact region of short anode GTO(SA-GTO). The operation mechanism is analyzed, and the conducting, blocking and switching characteristics are simulated by MEDICI simulator. The results show that injection...
This paper presents the design of a digital programmable control IC which is intended for controlling thyristors to produce a constant current source via a single- phase controlled rectifier. The architecture of the control IC consists of three major parts: a single-phase controlled triggering circuit, an inverse cosine look-up table, and a proportional-integral current controller. All the three parts...
The PWM current-source rectifier (CSR) is becoming a preferred choice to provide a DC current source for DC loads or current source fed drives. However the control of the resonance of the input LC filter is one of the main challenges. To dampen the LC resonance with minimum control and implementation efforts, a two-step Posicast controller for modulation signal shaping is first examined, which can...
Based on proximity gettering of platinum by vacancy defects which are induced by proton irradiation, local platinum doping is obtained. It is used as a local lifetime control technology in high-power diodes. The theoretical dependence of electrical active Pt concentration Cpts on irradiation induced defects concentration Cv is also studied. The diodes' reverse performance parameters are measured....
Permanent magnet synchronous machines (PMSM) are used in x-by-wire systems, because of the high efficiency and its good dynamic properties. To investigate the performance of the machine at fault situations, a 3-phase, 16-pole prototype (rated state torque 1.7 Nm, overload torque 20 Nm for impulse torque actuation) with tooth coils was built with the possibility for measuring different kinds of winding...
This paper presented the motion control algorithm based on quaternion rotation for a permanent magnet spherical stepper motor (PMSSM) designed by Gregory S. Chirikjian and David Stein et al. The movement of the rotor was achieved by controlling the current states of the stator coils with relays. While one arbitrary point on the surface of the rotor was expected to move to another appointed one, combining...
This paper presents a novel counter-rotating permanent magnet BLDCM (CRBLDCM) for underwater propulsion. This kind of motor is different from the traditional BLDCM in that both the rotor and the armature are rotating in the opposite directions, which is particularly suitable for underwater propulsion system. In this paper, the mathematical model of CRBLDCM is established based on its operation principle,...
The permanent magnet linear synchronous motor (PMLSM) direct thrust control (DTC) systems using space vector modulation (SVM) and sliding mode variable-structure are presented and analyzed. Firstly, simulation results of the classical DTC system and the system based on SVM and predictive PI controller are compared. Both systems based on SVM can keep the fast response characteristics of the conventional...
Purposely generating chaos-chaotifying control, when it is useful or beneficial, becomes one of the focuses in chaos engineering. In this paper, the direct time delay feedback is proposed for chaotifying control of permanent magnet synchronous motor (PMSM). The direct-axis or quadrature-axis stator voltage is used as manipulated variable, and the direct-axis or quadrature-axis current is used as time...
A novel PWM technique for single-switch three-phase AC-DC buck converter is proposed to reject input voltage fluctuation, obtain high quality output voltage and realize open-loop operation mode. By controlling the duty cycle of the switch which tracks the change of input voltage, the energy supplied by AC mains and the energy consumed in load can keep invariable in every switching cycle. So the output...
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