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In recent years, direct current power (DC) supply systems have been applied in various types of industrial equipment. As a common practice, an alternating current(AC)/DC converter will be introduced at the system front end to convert mains into DC power sources for system operation. However, when connecting to a power grid, under the influence of load-end characteristics, the phase difference between the voltage and current of the input AC power source will increase. This decreases the power factor (PF), reduces power quality, and affects the stability of system operation. In this paper, three types of circuit topologies (traditional, bridgeless, and interleaved boost) for power factor correction converters are compared and discussed. Moreover, features as well as pros and cons of these topologies are analysed. Finally, a prototype for each topology is studied and implemented. Further, the efficiency, PF, current harmonic distortion, and ripple are compared and examined based on experimental results.

To meet the requirements of planning and to improve accuracy and stability of traffic prediction model in the communication network for electric power, a traffic prediction method based on grey model optimized by buffer operator and particle swarm optimization (PSO) is proposed in this paper. Variable weights buffer operators are implemented for preprocessing traffic data to enhance the adaptability of gray prediction model. Taking the maximum grey correlation degree between prediction series and true series as objective function, based on the search ability of PSO, the fitness function is founded, which can determine the optimal parameters of gray model. Applying the improved model to traffic prediction in communication network for electric power, a new prediction result is drawn. The prediction result shows that the improved model has higher prediction accuracy compared with the traditional GM (1, N) model.

In this paper, a single-phase multilevel inverter with battery balancing is proposed. The input of each individual inverter is directly connected to a battery. The combination of batteries can be controlled according to the batteries' voltages to implement the battery-balancing function. The operational principle of the proposed system is first described, and then, the design equation is derived. Experiments show that the battery-balancing discharge function is achieved. Finally, a prototype is designed and implemented to verify the feasibility and excellent performance.

In this paper, the sinusoidal-ripple-current (SRC) charging strategy for a Li-ion battery is proposed. The ac-impedance analysis is used to explore the optimal charging frequency. Experiments indicate that the optimal charging performance can be achieved by the proposed SRC with the minimum-ac-impedance frequency fZmin. Compared with the conventional constant-current constant-voltage charging strategy, the charging time, the charging efficiency, the maximum rising temperature, and the lifetime of the Li-ion battery are improved by about 17%, 1.9%, 45.8%, and 16.1%, respectively.

Public building systems using mainly the roof and wall with semiconductor materials that generally a few hundred kilowatts to several megawatts, most of the power generation system, building their own electricity needs are met, excess electricity can be transmitted to the grid. The general annual solar radiation direction and the horizontal angle is the angle of inclination, and also based on the latitude of the installation area. A novel dual-axis tracking solar system is presented in this paper that can be simply manufactured , and the photovoltaic power generation is analysis from the system architecture. The mechanical and electrical characteristic is also analyzed and compared, and the proposed approach can be widely used in future wind-solar complementary system.

One of the key technologies of large-scale wind turbine composite blades developed, it relates to the aerodynamics, structural dynamics, structural testing of composite materials, process manufacturing, mold equipment technology, technical difficulty. The vast majority of the world leaves glass fiber reinforced plastic (FRP) composites manufacturing, the main consideration fiberglass / composite other materials do not have some advantages. Numerical results are presented in this paper to investigate the load pressure effect on the middle and the root of the blade. From the results of finite element analysis, leaves uneven force is very complex. The skin panels withstand normal stress caused by the bending of the left skin consider tensile strength under stress.

Since its introduction in the early 1960s, the inductive-loop detector has become the most utilized sensor in a traffic management system. It can obtain the data of traffic flow, occupancy and speed of the road. As a principal component, insulated loop wire is easy to be affected by pavement deformation and environment, so the health status and life of the equipment are easily affected. In order to study the health status of the lane detection devices, a single equipment health index model was proposed. The health status of the inductive loop wire is evaluated according to the results of health index calculation. So as to establish a set of management measures for the loop wire equipment. The health index is calculated by the basic data and the maintenance record of the lane detection equipment in the Beijing to Tibet freeway, so as to complete the health assessment of the loop wire, and make clear its actual operation. The results are in line with the actual situation of the equipment by the verification and evaluation.

Landscape eco-planning is an important approach to keep sustainable development, which can coordinate the relationship between man, nature and resource use. The landscape eco-planning in the future not only must meet the need of landscape's natural function and human, but also need to meet the need of sustainable use of the land. This article discusses the concept, the main principles, procedures and methods of landscape eco-planning, and clarifies the GIS technology in the use of landscape planning and design, in order to play a promote role in the landscape eco-planning in China.

In this paper, a novel photovoltaic (PV) maximum power point tracking (MPPT) based on biological swarm chasing behavior is proposed to increase the MPPT performance for a module-integrated PV power system. Each PV module is viewed as a particle, and as a result, the maximum power point is viewed as the moving target. Thus, every PV module can chase the maximum power point (MPP) automatically. A 525 W prototype constructed by three parallel-connected 175 W PV modules is implemented to assess the MPPT performance. Comparing with a typical perturb and observe (P & O) MPPT method, the MPPT efficiency ?MPPT is improved about 12.19% in transient state by the proposed MPPT as theoretical prediction.

In this paper, a resistance-compensated phase-locked battery charger (RC-PLBC) mathematical model is built, and its s-domain transfer function is also derived. The stable, safe, and nonovercharging conditions of the RC-PLBC are discussed, and many criteria are proposed. After that, a complete design procedure is presented for designing a fast and safe RC-PLBC. A prototype of RC-PLBC is designed and realized to verify the charging performance. Comparing with a typical PLBC, the charge speed of the proposed RC-PLBC is improved by 18%, and the safety is held on.

In this paper, a duty-varied voltage pulse-charge strategy (DVVPCS), that can detect and dynamically track the suitable duty of the charge pulse, is proposed to improve the battery-charge performance. To assess the system performance, a prototype of the duty-varied voltage pulse charger (DVVPC) is designed and implemented. Comparing with the standard constant-current and constant-voltage (CC-CV) charge strategy, the charge speed of the proposed DVVPCS is improved by about 14%, while the proposed DVVPCS is improved by about 5% in comparison with the conventional duty-fixed voltage pulse-charge strategy (DFVPCS). The charge efficiency of the proposed DVVPC has been improved by about 3.4% as compared with that of the general CC-CV. In comparison with conventional DFVPCS with D = 50%, the charge efficiency of the proposed DVVPCS is improved by about 1.5%. The results indicate that the DVVPCS can actually provide pulse with suitable duty to charge the battery, and the charge performance is improved.

In this paper, we consider an Li-ion battery as a grey system. The grey prediction technique is then used to develop a grey-predicted Li-ion battery charge system (GP-LBCS). The proposed GP-LBCS is designed to replace the general constant-voltage (CV) mode using the GP mode to improve the Li-ion battery charge behavior. A GP algorithm is built in GP-LBCS to make the charge trajectories faster and safer. A 3-D Y-mesh diagram for describing the charge trajectories of the proposed GP-LBCS is simulated. A GP-LBCS prototype is designed and implemented to assess the charge performance. Experiments show that the charge speed and the charge efficiency of the proposed GP-LBCS, compared with the general constant-current-CV charge system, are increased above 23% and 1.6%, respectively. The charge speed and efficiency in the proposed GP mode are improved above 34% and 7%, respectively, compared with that in the general CV mode.

Based on the environmental concern a novel central dimming system with magnetic ballast driven lighting system, Dimmable Magnetic Ballast System (DMBS), was presented to replace the electronic ballast driven lighting system. To make the DMBS work at a wide range of input voltages for dimming, an Adaptive Fluorescent Lamp Starter (AFLS) which can provide an adaptive preheating time and constant fire voltage for different operation voltage and environmental temperature is proposed in this paper. Experimental results show that features of an adaptive preheating time, a single-pulse ignition with constant fire voltage, and zero glow current can be achieved. Compared with conventional electronic starters, the proposed AFLS can stretch the lifetime and operating voltage range of the DMBS.

In this paper, a reflex charging strategy with the energy recovery function for a bidirectional converter (BC) is proposed to build a novel reflex-based BC (RBC) for increasing the battery charging efficiency in an uninterruptible power supply (UPS). The proposed RBC can provide a reflex charging current profile to charge the battery to obtain a high battery charging efficiency and prolong the battery life cycle. In particular, the negative pulse energy of the reflex charging current profile in the proposed RBC is recovered to reduce the battery charging dissipation. A soft transfer method is also developed in this paper to really erase the spike current in the RBC. A 400 W prototype is designed and implemented to verify the feasibility of the proposed RBC. Compared with a typical bidirectional converter, the battery charging efficiency, the battery charging speed, and the battery thermal deterioration effect are improved by about 10%, 8.8%, and 7%, respectively, with the proposed RBC.

A novel current-pumped battery charger (CPBC) is proposed in this paper to increase the Li-ion battery charging performance. A complete charging process, consisting of three subprocesses, namely: 1) the bulk current charging process; 2) the pulsed current charging process; and 3) the pulsed float charging process, can be automatically implemented by using the inherent characteristics of current-pumped phase-locked loop (CPLL). A design example for a 700-mA ldr h Li-ion battery is built to assess the CPBC's performance. In comparison with the conventional phase-locked battery charger, the battery available capacity and charging efficiency of the proposed CPBC are improved by about 6.9% and 1.5%, respectively. The results of the experiment show that a CPLL is really suitable for carrying out a Li-ion battery pulse charger.

In this paper, a linear model for describing the Li‐ion battery charging response is developed. Then a Phase‐Locked Battery Charger (PLBC) mathematical model is built, and its s‐domain transfer function is also derived. The stable, safe and fast charging conditions of the PLBC are discussed and many criteria are proposed. After that, a complete design procedure is presented for designing a fast and safe PLBC. Finally, a test example of the PLBC is designed and implemented for a 700 mAh Li‐ion battery in order to assess the performance of the presented Li‐ion battery model, PLBC mathematical model and design criteria. Experiments show that the computer simulation is close to the actual measurement. This means that the presented models of the Li‐ion battery and the PLBS are correct and can capture major electrical characteristics. Experiments also show that a stable, fast and non‐overcharging PLBC is successfully implemented as we wanted. This indicates that the presented PLBC design procedure is v...

In this paper, a Genetic Algorithm‐based Fuzzy Pulse Pump Controller (GA‐FPPC) is proposed to realize a Frequency‐Locked Servo system (FLS). In order to get a better convergence and a higher diversity in the genetic algorithm, a Mixed Elitist and Fuzzy Clustering (MEFC) selection strategy is proposed. A prototype of the GFC‐FLS is tested to assess the system performance. In comparison with the FPC and the SVDPC, the acquisition time of the GA‐FPPC is improved over than 18%. In particular, there is no overshoot in GA‐FPPC for any servo distances. In addition, the GA‐FPPC has the best tracking performance of these three controllers. These demonstrate that GA‐FPPC can actually provide an appropriate pump voltage to fast locking response without overshoot, meeting the theoretical prediction.

The inter-turn insulation of stator winding for wind turbine generator (WTG) usually suffers the repetitive impulse over-voltages when the converter is connected to the winding terminals. The long-term effect of repetitive impulse over-voltages may lead to the development of inter-turn insulation defects and/or the occurrence of inter-turn insulation fault due to partial discharge (PD) activity. In this paper, the detecting method of inter-turn PD in the stator winding of WTG under the induced impulse voltage was investigated. A typical form-wound winding specimen for simulating the inter-turn insulation system of WTG was prepared. An exciting system for inducing high impulse voltage was established. The induced impulse voltage on inter-turn insulations of specimen can be with the peak value up to 1200 V and rise time less than 0.5 μs. The high frequency current sensor with the band width of 1.5∼ 45 MHz was designed for detecting PD activity in inter-turn insulation. The numerically simulating model for this test system was also provided. A series of tests under the different induced impulse voltage levels were carried out in the laboratory. Corresponding to the different induced inter-turn voltages, the output signal of the current sensors were recorded and analyzed. The presently test results indicate that the inducted impulse voltage can excite the PD activity in the inter-turn insulation of specimen.

In this paper, an Adjustable Fuzzy Pulse Pump Controller (AFPPC) is proposed for use in a Frequency‐Locked Servo system (FLS). The defuzzification used in the AFPPC is the α‐cut based Adjustable Defuzzification Method (α‐ADM). By use of the α‐ADM, the behavior of the AFPPC can be easily and effectively modified and therefore a proper motion profile of the AFPPC can be easily obtained without tuning the membership functions and fuzzy control rules. Besides these points , the proposed AFPPC is able to overcome drawbacks inherent in the traditional FLS (e.g., slow locking process and overshoot) such that a fast and stable response without overshoot and containing zero steady‐state error is obtained. In this paper, the mathematical model for the AFPPC‐based FLS (AF‐FLS) is derived as well. Based on this model, computer simulation is conducted to determine the α value of the AFPPC, and the system stability is discussed to determine the sampling period T. To justify the proposed approach, a position se...

In this paper, a Fuzzy Pulse Pump Controller (FPPC) is proposed to realize a Fuzzy‐Controlled Frequency‐Locked Servo system (FC‐FLS) for getting a fast locking response without overshoot. A prototype FC‐FLS is designed and built to assess the system performance. In comparison with the Frequency Pump Controller‐based FLS (FPC‐FLS) and Variable Slope Pulse Pump Controller‐based FLS (VSPPC‐FLS), the acquisition times of the FC‐FLS are improved over 40%. In particular, there is no overshoot in the FC‐FLS for any servo distance. This means that a fast‐locking FLS, without overshoot, has been successfully implemented as theoretical prediction.

A fuzzy-controlled active state-of-charge controller (FC-ASCC) for improving the charging behavior of a lithium-ion (Li-ion) battery is proposed. The proposed FC-ASCC is designed to replace the general constant-voltage charging mode by two kinds of modes: sense and charge. A fuzzy-controlled algorithm is built with the predicted charger performance to program the charging trajectory faster and to keep the charge operation in a proposed safe-charge area (SCA). A modeling work is conducted for analyzing and describing the Li-ion battery in charging process. A three-dimensional Y-mesh diagram for describing the charging trajectories of the proposed FC charger is simulated. A prototype of a Li-ion battery charger with FC-ASCC is simulated and realized to assess the predicted charging performance. Experiment shows that the charging speed of the proposed FC charger compared with the general one increases about 23% and the charger can safely work in the SCA.

A microprocessor‐based adaptive pulse‐pump controller (μP‐APPC) for X‐Y mode frequency‐locked stepping position servo control system (XY‐FLSPS) is proposed. A control strategy in μP‐APPC for fasting the system locking process is developed. A discrete frequency set is built to represent the servo position so as to raise the accuracy of position lock and reduce the conversion error in the signal processing. The μP‐APPC can respectively provide proper X's and Y's motion profiles for guiding their movements according to the detected position errors. An X‐Y pulse rate identifier (XY‐RI) is built to prescribe the instant X‐axis and Y‐axis motion speeds so that both X and Y motors can reach the target at approximately the same time. System modeling for analysis and computer simulation is constructed. A prototype of the XY‐FLSPS with μP‐APPC controller is developed for assessing system performance, and the X‐Y position and speed responses are described by three‐dimensional display.

In this paper, a phase-locked battery charger (PLBC) is proposed to show that a phase-locked loop (PLL) is a perfect circuit topology for battery charging. The circuit topology of the PLBC is almost the same as that of the PLL and it inherits the merits of the PLL, such as autotracking, autolocking, and high accuracy. A complete charging process, consisting of three subprocesses: constant current charge, variable current charge, and float charge, can be automatically implemented by using the above inherent characteristics of the PLL. Experimental results show that the PLL is really suitable for carrying out a battery charge controller.

In this paper, a cascaded multilevel inverter with selective harmonic elimination and battery-balanced discharge function (CMI-SHE & BBD) is proposed. The input of each level of cascaded multilevel inverter circuit is directly connected to a battery. Duty cycle of switch of each level is controlled to contain the ac output voltage with minimize total harmonic distortion. Additionally, the battery-balanced discharge function is also achieved. Finally, an equivalent model block diagram of the proposed system to verify the feasibility and advantage by using simulate software MATLAB. The simulation system results show that the proposed multilevel inverter with selective harmonic elimination and battery-balanced discharge function can eliminate harmonic and improve the cascaded battery-imbalanced problem effectively as we wanted.

In this paper, an instantaneous maximum power point tracking (MPPT) control is first adopted to achieve fast tracking response for the photovoltaic (PV) power generation system. Then an instantaneous real power tracking control is proposed to overcome the dilemma of the inherent double line frequency ripple without adding an additional circuit so that one can replace the large electrolytic capacitor with small bipolar film-type capacitors to achieve longer lifetime of the single-phase grid-tied inverter. Furthermore, the mathematical model of the PV system is derived and the minimum capacitance for a specified allowable DC-link capacitor voltage swing is obtained. Finally, simulation results are given for verifying the feasibility of the proposed control strategy.

This paper proposed a novel inductive coupling power transfer (ICPT) topology to improve the power factor, output voltage regulation and efficiency. The proposed ICPT is mainly constructed by a voltage controllable power factor corrector (VC-PFC) and a LLC resonant circuit. Additionally, the series compensation and series-parallel compensation are used in the primary and the secondary sides of the coupling transformer to increase the coupling efficiency and the load range. Finally, the circuit simulation of the proposed ICPT is presented to verify the performance. Simulation results show that under the 10 mm coupling distance, the power factor correction and output voltage regulation can be achieved at the same time.

Negative ions technology has been widely used to deal with air pollution problems in recent years. In this paper, a negative ions generating circuit is designed for dealing with the exhaust gas from vehicles. In the high electric field, the air is ionized. The number of active particles increases in the air. These particles react with the exhaust gas, and clean the air. The circuit analysis and simulation are presented in this paper.

A high efficiency wind power converter, mainly constructed by the proposed duty boundary condition boost converter (DBC-BC) is proposed in this paper. It can work in the high efficiency duty cycle to effectively increase the efficiency of wind power converter. A 3kW prototype is designed and implemented to assess the performance of the proposed DBC-BC. Experimental results show that a wind power converter with high efficiency 95% can be obtained by using the proposed DBC-BC.

A novel high efficiency Current-Shared Photovoltaic Power System (CS-PPS), mainly constructed by the Maximum Power Point Tracking and Power Conditioning System (MPPT-PC), is proposed in this paper. The proposed MPPT-PC can track the MPPT and regulate the load energy condition at the same time for increasing the circuit efficiency and providing stable power to critical loads. A 200W prototype is designed and implemented to assess the performance of the proposed CS-PPSS. Experimental results show that the proposed CS-PPSS can track the maximum power point of the PV panel, regulate the load energy, increase the circuit efficiency, and reduce the circuit cost as we wanted.

In this paper, a sinusoidal current charger (Sin-CC) with optimal frequency tracker is proposed for Li-ion battery. The proposed optimal frequency tracker is mainly constructed by the phase-lock-loop so that the features of detecting, tracking and locking in the optimal charging frequency can be achieved. The experimental results show that the charging speed charging efficiency and increasing surface temperature of the proposed Sin-CC are improved about 5%, 5.5% and 51.5%compared with that of the conventional constant current charge system.

a new fault line selection method based on the elimination of unbalanced current of zero-sequence active power is proposed by analyzing the principle of active power method and its inaccuracy. The amplitude and phase of real zero-sequence currents can be calculated by the method and the effect of unbalanced current is eliminated. Besides, the difference of active power between fault line and non-fault lines is enlarged. So the accuracy of line selection is improved. The correctness of the method is proved by theory analysis and simulation.

After researching the steady and transient characteristics of single-phase-to-earth faults in small current grounded system, systematically comparing the advantages and disadvantages of existed methods about fault line detection and location, this paper presents a method of fault location by coordinating transient traveling wave method with artificial pulse signal injection method. According to the different phase of the fault phase, a reasonable choice to use line own information or injection signal be made. According to intervals of adjacent traveling wave wavelet transform modulus maximum, propagation time between fault and measuring points can be identified, in order to achieve location. A large number of simulation results show that the method proposed can give exact location results for single-phase-to-earth faults in small current grounded system, and overcome the deficiency of only one location method be used could easily lead to an inaccurate result.

This paper presents a real-time voltage sag monitoring system. Discrete wavelet transform (DWT) is implemented by using an embedded chipset in order to monitor initial and ending points of voltage sag. A flywheel energy storage system (FESS) is designed for voltage sag compensation, and proof-of-principle experiment is presented.

The paper introduced a three-phase five-column arc suppression coil (TPFCASC) and discussed its autotracking compensation theory, namely, extremum method. Then the authors briefly analyzed the single phase to ground fault of a neutral point grounded by arc suppression coil (ASC) system. Using symmetrical-component method and complex sequence network, the paper detailedly deduced the voltage variation of the distribution network when happening the open phase at the TPFCASC. The author draw a conclusion that in both single and double open phase fault the zero-sequence voltage of the network would appear. The magnitude of the zero-sequence voltage had relation to the out-of-resonance degree of the ASC and the damping rate of the distribution network. Last, the paper designed the protection scheme for the open phase fault at the TPFCASC by using both the zero-sequence voltage of the network and the phase current of the TPFCASC.

This paper presents a design and simulation for the voltage sag monitoring technique that intends to apply to multi-point measurement in a power transmission system. The purpose of this research is to fabricate a mixed-signal processing unit especially for power quality monitoring. The system modeling shows the framing discrete wavelet transform proves that the decision making for the voltage monitoring can be faster than the root-mean-square calculations. Also, analog integrated circuit for the data acquisition and digital integrated circuit for the discrete wavelet transform are designed and simulated in this paper. The voltage sag waveforms tested in this research project are obtained from IEEE P1159.2. They are categorized into two different cases: voltage sag caused by a single line-to-ground fault and interruption preceded by voltage sag.

In this paper, a reflex charging strategy with the energy recovery function for a bidirectional converter (BC) is proposed to build a novel reflex-based BC (RBC) for increasing the battery charging efficiency in an uninterruptible power supply (UPS). The proposed RBC can provide a reflex charging current profile to charge the battery to obtain a high battery charging efficiency and prolong the battery life cycle. Specially, negative pulse energy of the reflex charging current profile in the proposed RBC is recovered to reduce the battery charging dissipation. A 400 W prototype is design and implemented to verify the feasibility of the proposed RBC. Compared with a typical bidirectional converter, the battery charging efficiency and the battery charging speed are improved about 10% and 8.8% by the proposed RBC, respectively.

In this paper, a duty-varied pulse charge strategy (DVPCS), that can detect and dynamically track the optimal duty of the charge pulse, is proposed to improve the battery charge performance. To assess the system performance, a prototype of the duty-varied pulse charger (DVPC) is designed and implemented. Comparing with the standard constant-current and constant-voltage charge strategy, the charge speed of the proposed DVPCS is improved about 14%, while the proposed DVPCS is improved about 5% comparing with the conventional duty-fixed pulse charge strategy (DFPCS). The results indicate that the DVPCS can actually provide pulse with optimal duty to charge the battery and the charge response is improved.

The resistance-compensated phase-locked battery charger (RC-PLBC) proposes as a new and fast charging circuit topology for Li-ion battery in this paper. The circuit topology of the proposed RC-PLBC is not only the same as that of a phase-locked loop (PLL) but also can compensate the pack resistance of Li-ion batteries. Therefore, a complete charging process, consisting of three sub-processes: bulk current charge, variable current charge and float charge, can be automatically implemented with fast charging behavior. The mathematical model of the proposed RC-PLBC is driven, and then the stability of the RC-PLBC is discussed. After that, a complete circuit design procedure is presented to guild the engineer to design a desired RC-PLBC. Finally, a prototype of RC-PLBC is designed according the presented design procedure and realized to verify the charging performance. Comparing with a typical phase-locked battery charger, the charge speed of the proposed RC-PLBC is improved by 18% as well as the safety is held on.

Electric pulse field methods are powerful tools for cell characterization and manipulation and are wildly used in biotechnology and medical applications. A pulse generator (PG) is the device which provides the desired electric pulse field. In this paper, a low cost AC-Powered Bipolar PG (AC-BPG), directly powered by normal AC power (i.e., utility power), is proposed. Since there is no high-voltage DC power supply in the proposed AC-BPG, the circuit complexity and cost is effectively reduced. Furthermore, the voltage of the generated bipolar pulse of the AC-BPG can easily be controlled to match specific applications. This function is not easy to be implemented in conventional pulse generators after a fixed high-voltage DC power supply is selected. In order to assess the performance of the proposed AC-BPG, a prototype is designed, realized and tested. Experimental results show that the AC-BPG can actually generate a 0-1, 300V pulse with 56 ?s duration, without overshoot and ringing. Using a 1-4 mm standard commercial cuvette, the AC-BPG can provide electric pulse fields of 0-13 KV/cm to be used in bioelectronics, medical and industrial applications.

In this paper, a method to obtain the optimal parameters of PID(proportional, integral and derivative) controllers for the twin rotor multi-input multi-output system (TRMS) by using the optimal method , combined with the model reduced method, is proposed. The fuzzy control method with the multi-section gains and derivatives is also presented for the improvement of the tracking performance and the disturbance problem from the air flow. Both methods are implemented by the new real-time control system. The simulation results and the experiment verification show the effectiveness of the proposed methods

In this paper, a digital frequency-locked battery charger (DFLBC) for Li-ion battery is proposed. The circuit topology of the proposed DFLBC is same as that of the phase/frequency-locked loop, which means that the proposed DFLBC has lots of inherently abilities as those of phase/frequency-locked loops, such as auto-tracking, auto-locking, and high accuracy. Using the above-mentioned abilities, a complete charging process, consisting of three sub-processes: bulk current charge process, variable current charge process and float charge process can be inherently implemented. In the proposed DFLBC, the charge trajectory can be digitally programmed according to the behaviors of the Li-ion battery to achieve a better charge performance. Experimental results show that the charge speed of the proposed DFLBC compared with that of a typical frequency-locked battery charger (FLBC) is improved about 16%.

A cost competitive circuit of a fluorescent lamp electronic starter that can provide a single-pulse ignition, adaptive preheating time, fast reset and lower voltage working ability is proposed in this paper. In order to analyze the proposed electronic starter, circuit topologies in each working state are derived. A prototype for 20 W fluorescent lamps is also designed and implemented to access the performance. Experimental results show that features of a single-pulse ignition, adaptive preheating time, fast reset and lower voltage working ability can be achieved what we have predicted.

In this study, an integrated embedded system architecture for in-vehicle telematics and infotainment system (IVTIS) is proposed. A wireless communication network is utilized to provide the location-based and emergency services to the in-vehicle users, while the in- vehicle network is established to provide applications in communications and entertainment. The prototype of the system is demonstrated as well.

Test for complying with electromagnetic interference (EMI) emission limits is usually carried out during the product design. A PC-based EMI automatic measurement and filter design system for telecommunications power supplies is proposed. The effort of suppressing EMI emission is greatly reduced by the fast computing speed and the friendly man-machine interface of the PC. The developed system can be an effective noise diagnosis and filter design tool. Not only the design process is speeded up, but also the acceptability of the designers can be enhanced.

In distribution systems the following grounding ways, i.e. non grounding, arc-suppression coil grounding and arc suppression coil via small resistance grounding, are often applied. Because each grounding way has its own features, therefore, it is necessary to carry out technical economical comparison before select ion for the particular case. In 6 kV coalmine power system, the transmission lines mostly are cables, the grounding current is almost capacitive current, so arc-suppression coil grounding is widely used in coalmine power system. This paper presents a new type of arc-suppression coil, then focus on study of the compensatory principle of arc-suppression coil with three phases and five columns. The structure of this arc-suppression coil is different from the traditional mode, and it is the integration of the traditional grounding transformer and arc-suppression coil. The arc-suppression coil with three phases and five columns can realize automatic trace and compensation for grounded fault capacitive current of power system by the method of regulate the thyristor triggering angle to control the inductive current of second winding. The wave shape of the arc-suppression coil with three phases and five columns is also analyzed and calculated in this paper