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In an AC-DC-AC motor drive system, a beat phenomenon of the motor current occurs, especially in the over-modulation range with DC-link voltage ripple and low frequency carrier. We analyze this beat phenomenon and propose two beatless control methods. One modifies the carrier frequency in accordance with the motor speed within a narrow range, and as a result, the beat frequency can be shifted to a...
Almost every public transport vehicle includes the battery pack. For it's charging is necessary that the vehicle dispose with charger. These vehicles are usually operated in different parts of the world and in many areas there are extreme conditions. To ensure operational reliability and a long operating time without maintenance. The charger was designed and created with natural cooling for extreme...
In modern portable devices, multiple power sources with wide voltage range could be used while a stable supply voltage is required. In order to extend battery lifetime or supply source from energy harvester, boost regulator is needed to support certain analog functions like precision analog circuit or LED driver. In such applications, a switch-cap boost regulator is usually used. In this paper, mechanism...
For humanoid robot applications in nuclear radiation environments, not only the electronic and mechanical parts, but also the servo system in robots could be damaged by large dose of radiation. In this paper we study the radiation induced degradation to the brushless DC (BLDC) motor in the robot servo systems and analyze how its performance changes due to radiation induced demagnetization. The radiation...
This paper presents a Sparse Indirect Matrix Converter (SIMC) topology, which can be proposed as an alternative to the direct matrix converter. This double stage converter configuration consists of a combination of two conventional converters through a fictitious intermediate floor without capacitive storage element. The first floor is a controlled rectifier directly connected to a second floor, which...
Switched Reluctance Motor (SRM), which has many advantages like Induction machine exhibits very nonlinear characteristics and high torque ripple, the only disadvantages of this machine. Its torque ripple is dependent on the current profile and also on the turn on and turns off angle of phase excitation and the speed is dependent on the current command. This work presents one of the Heuristic approaches...
In the context of environmental pollution and energy resources in the growing tension, solar energy as a new type of green and renewable energy has been paid for more and more attention. The most attention focuses on photovoltaic. But the stability of PV (photovoltaic) system output is poor, the grid will seriously affect the power quality. To ensure the normal operation of photovoltaic power generation...
The paper deals with a wind power generation system which consists in wind turbines driving an asynchronous Doubly-Fed Induction Generator — DFIG connected to a 0.4 kV three-phase network. The wind turbines which use DFIG generators provide a constant frequency although the rotor operates with variable speed, by means of the converter with IGBT AC-DC-AC transistors based on PWM control. There are...
A mechatronic system for neurorehabilitation of motion system of the human lower limbs is presented. Moreover, the structure of the complex and its components — feet training device with acupressure effect on feet, half-bed standing frame (verticalizer), lower limbs exoskeleton to operate them in case of loss of mobility or for active workouts are presented. The complex is designed to help patients...
In light condition, switches of Phase Shift-Full Bridge (PB-FB) DC/DC converter cannot satisfy the condition of Zero Voltage Switch (ZVS). Based on field-programmable gate array (FPGA), PWM and PS control method are used according to different load condition. In addition, switching loss of converter is explained, and design process is presented in detail. Experiment results indicate the mutual combination...
In this paper, the method of the realization of a MHz level switching frequency DC-DC converter for high power-density is presented. For high power-density, Gallium Nitride field effect transistor (GaN-FET) and current-mode resonant DC-DC converter are adopted. In addition, the proposed pulse width modulation (PWM) control method which is suitable for the isolated current-mode resonant DC-DC converter...
DC Motor controller is the most important issue in many applications. There are trade-off between the performance and the final cost. Most of the proposed controllers in the territory of artificial intelligence have complicated computations that make them inapplicable. In this paper particle swarm optimization is used for identification of the DC motor and then adaptive neuro-fuzzy inference system...
Home automation and smart grid development is motivated by many advantageous situations that include the demands on renewable energy and the advantages provided by power line communications technology (PLC). The integration of solar energy into conventional grid implies the control of different modules included in the system. Remote control seems to be the control mode by excellence, in which communication...
Industrial and residential appliances which use DC power often require regulated power supply. If the input supply is DC, then the usual way is to use Pulse Width Modulated (PWM) DC-DC converters. This paper presents a hybrid regulator which has been designed especially for a Brushless DC fan requiring very robust control on the input voltage. The hybrid regulator requires a novel isolation circuit...
Ever increasing energy consumption and pollution caused by burning of fossil fuels to meet our energy requirements have led researchers to focus on alternate forms of energy which are clean. Solar, wind and fuel cells are the areas in which research is going on with fast pace. Solar and wind have their drawbacks since electricity is generated only when sun shines or wind blows while fuel cells can...
This paper proposes a feedback control method for a Linear Resonant Actuator (LRA), in which an external load estimated from two signals of the back-EMF is used as the target voltage in PID control. From the estimated load, it becomes possible to obtain an arbitrary amplitude of the mover. The effectiveness of this method was verified through FEM analysis and measurement.
This paper presents a simple unipolar excitation strategy by using PWM current control for switched reluctance (SR) motors. In this technique, SR motors are non-sequentially excited by half sine-wave (HSW) currents which generate no negative torque. The implementation of this technique is simple and straightforward because SR motors are driven by adjusting only the peak value of the HSW current. Additionally,...
Power Line Communication (PLC) is a communication method where the existing Power Line carries data. The home automation associates the usual electrical cabling to the renewable plants for smart home, smart grid. The use of PLC technology permits the use of the existing electrical network for data transfer. The use of renewable energy helps to reduce the electrical energy consumption. The user can...
The dual active bridge (DAB) topology has great advantages for high power dc-dc conversion, especially in applications that bidirectional power transfer is required. Characteristics of dual active bridge are studied while approximating the power transfer by considering the fundamental components. Switching modes for each working mode of DAB are confirmed base on the criteria that extending the soft...
Regular Sampling is the state of the art when employing digital discrete-time control to pulse width-modulated systems. However, the fact that the dynamics of discrete-time control is below that of an analog continuous-time control is often not being aware. The paper shows that digital control dynamics can be improved with oversampling, i.e. employing a higher rate for sampling and controller updating...
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