IEEE Transactions on Industrial Electronics
IEEE Transactions on Industrial Electronics
Special Section on EMC-EMI FIELDS of
ELECTROMAGNETIC TECHNOLOGIES
1. D. Gonzalez, J. Gago, J. Balcells, "New simplified method for the simulation of conducted EMI generated by switched power converters," IEEE Trans. on Industrial Electronics, vol. 50, no. 6, pp. 1078- 1084, Dec. 2003. Full Text Link
Abstract : A new simplified simulation method for the calculation of conducted electromagnetic interference (EMI) caused by switched power converters (SPCs) is presented. EMI simulation in real SPCs presents particular problems due to complex geometry and the wide range of time constants involved. This makes the computation of EMI a complex matter. The method presented here is based on a "source propagation path-derived disturbance" simulation process and is specially designed to simplify the mentioned computation problems. In the design of the proposed method, quick and robust simulations were preferred rather than very accurate results. The resulting models allow quite accurate predictions and sensitivity analysis when certain changes in components or layout are introduced. The paper presents two validation cases, where simulation and experimental results of conducted EMI generated by a general-purpose VSI, with different switching patterns and different layout, are compared.
2. N. Mutoh, J. Nakashima, M. Kanesaki, "Multilayer power printed structures suitable for controlling EMI noises generated in power converters," IEEE Trans. on Industrial Electronics, vol. 50, no. 6, pp. 1085- 1094, Dec. 2003. Full Text Link
Abstract : Electromagnetic interference (EMI) noises generated in power converters are diffused on the surface of conductors. This means influences occur from radiated EMI noises emitted from power transmission lines as well as conducted EMI noises transmitted from them. EMI noises diffusing on the surface of conductors are generally difficult to control using conventional concentrated constant theory. Thus, a new approach based on distributed constant circuit theory is needed in order to control EMI noises. A power converter structure to control EMI noises using multilayer power printed circuit technology is studied in this paper. A structure which can control EMI noises should simultaneously satisfy two conditions, i.e., one to shut down and one to attenuate EMI noises. The structure satisfying these conditions is studied through simulations using the Transmission-Line Modeling Method. The simulations show that the diffusion of EMI noises is controlled by dividing the flow of currents produced by EMI noises into the horizontal and perpendicular directions. That is, the horizontal current flow is controlled inside using the differences in the resistance produced from differences between inner and outer diameter of power transmission lines and the perpendicular current flow can be controlled by properly designing the thickness of the dielectric layer sandwiched between P-and N-power transmission lines with the symmetrical structure. Moreover, it is confirmed by simulations and experiments that the attenuation of EMI noises is affected by the width of the power transmission lines. It is expected that the results obtained in this paper can provide important rules when designing power converters with EMI noise control functions which use the multilayer power printed circuit technology.
3. M. Shoyama, Ge Li, T. Ninomiya, "Balanced switching converter to reduce common-mode conducted noise," IEEE Trans. on Industrial Electronics, vol. 50, no. 6, pp. 1095- 1099, Dec. 2003. Full Text Link
Abstract : Because conventional switching converters have usually used unbalanced circuit topologies, parasitic capacitance between the drain/collector of an active switch and the frame ground through its heat sink may generate the common-mode conducted noise. This paper proposes a balanced switching converter circuit, which is an effective way to reduce the common-mode conducted noise. As an example, a boost converter version of the balanced switching converter is presented, and the mechanism of the common-mode noise reduction is explained using an equivalent circuit. This good feature is confirmed by experimental results. The concept of the balanced switching converter is applied to some other types of switching converters.
4. V.A. Katic, J.M. Knezevic, D. Graovac, "Application-oriented comparison of the methods for AC/DC converter harmonics analysis," IEEE Trans. on Industrial Electronics, vol. 50, no. 6, pp. 1100- 1108, Dec. 2003. Full Text Link
Abstract : Fourier transform (FT) is the most widely used tool for voltage and current waveform analysis. Nevertheless, it has certain drawbacks for time-varying signals analysis. Therefore, a need for another analysis technique appears. windowed FT, wavelet transform, and modulated lapped transform were considered in this paper. Comparison based on practical application shows the advantages of the last one. As an example, it has been applied for ac/dc converter input current harmonics analysis.
5. M. Bertoluzzo, G.S. Buja, S. Castellan, P. Fiorentin, "Neural network technique for the joint time-frequency analysis of distorted signal," IEEE Trans. on Industrial Electronics, vol. 50, no. 6, pp. 1109- 1115, Dec. 2003. Full Text Link
Abstract : Nonstationary distorted signals need to be analyzed in both the time and frequency domains to determine their characteristics. In this paper, a technique based on a neural network (NN) is presented which has the merit of providing such an analysis in real time. After arranging a suitable NN, the algorithm utilized to carry out the analysis is illustrated. Then, expressions assessing the dynamic behavior and the steady-state accuracy of the technique are derived. From the expressions, the influence of the NN parameters on the technique performance is readily recognized. As an example, the technique is applied to the analysis of the time evolution of the current harmonics absorbed by a diode rectifier and the results are compared with those obtained by the short-time Fourier transform.
6. M. Orabi, T. Ninomiya, "Nonlinear dynamics of power-factor-correction converter," IEEE Trans. on Industrial Electronics, vol. 50, no. 6, pp. 1116- 1125, Dec. 2003. Full Text Link
Abstract : The boost power-factor-correction (PFC) converter with average-current-mode control is a nonlinear system due to the effects of the multiplier and a large variation of the duty ratio. Although its stability analysis must be studied depending on a nonlinear model, most prior research attempted to make some assumptions to force this nonlinear system to be linear. As a result, the practical dynamics and the nonlinear phenomena were disregarded. In this paper, two kinds of nonlinear phenomena are detected under the conditions that are considered to be stable by the prior criteria: one is period-doubling bifurcation and the other is chaos. Stability maps and phase-plane trajectories are introduced at different loads to clarify the power factor and also the instability regions. It is clear that the output storage capacitor is a main contributing parameter on the system stability, therefore, bifurcation maps are developed to determine the accurate minimum output capacitance value that assures the system stability under all operating conditions. Also, PFC converter stability is explained and judged by comparing the consequence of charging and discharging energy in the output capacitor.
7. T. Ohnishi, M. Hojo, "AC line voltage harmonics compensator with excessive current control," IEEE Trans. on Industrial Electronics, vol. 50, no. 6, pp. 1126- 1133, Dec. 2003. Full Text Link
Abstract : We investigate an instantaneous common terminal voltage-controlled harmonics compensator constructed by a shunt active filter with an appropriate series inductance including the line impedance. This compensator can reduce or compensate both the ac line voltage distortion derived from the downstream utility source voltage harmonics and the upstream current harmonics by nonlinear loads at the same time. The control system can be easily constructed without directly detecting the common terminal voltage to be compensated. Therefore, the main circuit configuration and the control system are simple. The harmonics compensation level and the compensation current can be easily adjusted by changing the feedback gain for the sensing inductance voltage drop. In this paper, we describe the basic principle of the control method, the modified control method, the circuit construction by the pulsewidth-modulation-controlled shunt active filter and the control system of the compensator. Then, we show some operating waveforms for the cases of the downstream voltage distortion and the upstream harmonics current from the nonlinear loads by simulation analysis and experiments to verify the feasibility.
8. T. Takeshita, N. Matsui, "Current waveform control of PWM converter system for harmonic suppression on distribution system," IEEE Trans. on Industrial Electronics, vol. 50, no. 6, pp. 1134- 1139, Dec. 2003. Full Text Link
Abstract : The voltage waveform on the electric power distribution system is distorted by harmonic-producing loads. Regardless of the terminal voltage waveform with or without harmonics, the conventional current waveform of the pulsewidth-modulated converter systems connected to the power distribution system is always controlled to be sinusoidal. For harmonic suppression of the voltage and current on the distribution system, the authors propose the distorted current waveform whose harmonic components are in phase with the terminal voltage harmonics. The effectiveness of the proposed current waveform has been verified by experiments.
9. S.-I. Hamasaki, M. Cao, A. Kawamura, "Experimental verification of disturbance-observer-based active filter for resonance suppression," IEEE Trans. on Industrial Electronics, vol. 50, no. 6, pp. 1140- 1147, Dec. 2003. Full Text Link
Abstract : In the case of harmonic compensation based on the detection of the line current, a problem of the resonance between the active filter (AF) and an LC filter often arises if an LC filter is connected parallel to the AF Thus, the disturbance observer is introduced to solve this problem. By the estimation of the harmonics disturbance using the proposed disturbance observer, the compensation characteristics of the AF are improved and the resonant current can be compensated. In this paper, the theoretical analyses of resonance, a design of the disturbance-observer-based AF, and the experimental results are presented.
10. M. Saito, T. Takeshita, N. Matsui, "Modeling and harmonic suppression for power distribution systems," IEEE Trans. on Industrial Electronics, vol. 50, no. 6, pp. 1148- 1158, Dec. 2003. Full Text Link
Abstract : Expansion of voltage distortions along power distribution systems, which is referred to as the harmonic propagation, is pointed out. This is caused by the LC resonances between the distribution line inductances and the power capacitors. This paper presents a modeling and harmonic suppression procedure for power distribution systems. In our proposal, the power distribution system is analyzed based on the modal analysis and it is represented by a reduced-order model. For the harmonic suppression, a series active filter is used and its controller is designed based on the reduced-order model so as to cancel the dominant LC resonances in the power distribution system. Some significant characteristics are verified by experiments using a single-phase power distribution system.
11. H. Ukai, K. Nakamura, N. Matsui, "DSP- and GPS-based synchronized measurement system of harmonics in wide-area distribution system," IEEE Trans. on Industrial Electronics, vol. 50, no. 6, pp. 1159- 1164, Dec. 2003. Full Text Link
Abstract : With the recent progress in power electronics devices, harmonic pollution in the power system becomes a significant problem. Therefore, a great deal of attention has been paid to harmonic regulations and suppression technologies. As the utility power distribution system becomes broader and more complex, advanced harmonic measurement and analysis technologies are required. This paper presents the advanced measurement system of harmonics in a wide-area distribution system. The proposed measurement system has the following features. The measurement unit at each point in the distribution system consists of a digital signal processor as a high-speed processor and a global positioning system as a synchronization measurement. These units as terminals at multipoints in the distribution system are connected to the central monitoring station by the Internet. By using this system, the harmonic flows in the distribution system are measured and, hence, harmonic modeling can be realized in real time.
12. R. Dhaouadi, F.H. Ghorbel, P.S. Gandhi, "A new dynamic model of hysteresis in harmonic drives," IEEE Trans. on Industrial Electronics, vol. 50, no. 6, pp. 1165- 1171, Dec. 2003. Full Text Link
Abstract : In this paper, we propose a new dynamic model to describe the hysteresis phenomenon in harmonic drives. The experimental observation of the dynamic torque-displacement relationship for a harmonic drive shows a hysteresis characteristic indicating the simultaneous presence of energy storage and energy dissipation mechanisms. To completely characterize these mechanisms and yet have a simple representation for control, we develop a new hysteresis model using the heredity concept of dynamic systems. This model represents the hysteresis phenomenon by a combination of a nonlinear stiffness component and a nonlinear damping component leading to a mathematically well-posed nonlinear differential equation. The parameters of the model are identified using optimization techniques. We present some important mathematical properties of the model that give insight into model behavior and thus establish a mathematical basis for control. Numerical simulations in comparison with experimental data using our Harmonic Drive Test Apparatus verify the accuracy of the proposed model to represent the complex hysteresis dynamics of harmonic drives.
13. M. Iwasaki, H. Takei, N. Matsui, "GMDH-based modeling and feedforward compensation for nonlinear friction in table drive systems," IEEE Trans. on Industrial Electronics, vol. 50, no. 6, pp. 1172- 1178, Dec. 2003. Full Text Link
Abstract : This paper presents a novel mathematical model-based feedforward compensator design for the nonlinear friction in table drive systems using the Group Method of Data Handling (GMDH). In the proposed approach, the nonlinear friction can be autonomously modeled as a polynomial expression for appropriate control state variables according to the process of GMDH and, as a result, the complicated structural modeling and its parameterization, indispensable to conventional model-based strategies, can be completely eliminated. In addition, since the proposed GMDH-based model can achieve the generalization ability for table drive conditions, the robust compensation for friction can be attained against the change of drive conditions. Experimental verifications using a table drive system of actual machine tools show the significant performance improvement of the proposed algorithm in the trajectory control with velocity reversal motion.
14. Daowei Wu, Guoxiao Guo, Tow C Chong, "Comparative analysis on resonance compensation in HDD dual-stage actuation systems," IEEE Trans. on Industrial Electronics, vol. 50, no. 6, pp. 1179- 1186, Dec. 2003. Full Text Link
Abstract : Dual-stage actuation using a milli/microactuator is expected to be adopted in hard disk drives (HDDs) to meet the servo bandwidth requirement for higher recording density in the near future. Milli/microactuator resonance and its uncertainty deteriorate the stability of HDD dual-stage control loop and thus restrict the extension of servo bandwidth. In this paper, three resonance compensation approaches for the milli/microactuator, i.e., notch filtering, indirect adaptive compensation, and structurally parallel compensation are analyzed and compared in terms of the capability of resonance suppression, the robustness to resonance shift, and the complexity of implementation. Experimental results are scrutinized to illustrate the merits and drawbacks of each method for a better understanding of resonance compensation in HDD dual-stage actuation systems to support ultrahigh tracking accuracy.
15. K.K. Mohapatra, K. Gopakumar, V.T. Somasekhar, L. Umanand, "A harmonic elimination and suppression scheme for an open-end winding induction motor drive," IEEE Trans. on Industrial Electronics, vol. 50, no. 6, pp. 1187- 1198, Dec. 2003. Full Text Link
Abstract : In this paper, a harmonic elimination and suppression scheme for a dual-inverter-fed open-end winding induction motor drive is presented. Two isolated dc-link sources with voltage ratio of approximately 1 : 0.366 are required for the present drive. These two isolated do links feeding two inverters to drive the open-end winding induction motor eliminate the triplen harmonic currents from the motor phase. The pulsewidth-modulation scheme proposed enables the cancellation of all the 5th- and 7th-order (6n /spl plusmn/ 1, where n = 1, 3, 5, 7, etc.) harmonic voltages and suppresses the 11th- and 13th-order harmonic voltage amplitudes in the motor phase voltage, in all modulation ranges. The next higher order harmonics present in the motor phase voltages are 23rd, 25th, 35th, 37th etc. (6n /spl plusmn/ 1, n = 4, 6, etc.). By using triangular carrier wave and proper modulating waves for each inverter, the open-end winding induction motor can be operated in the entire modulation range, eliminating all the 6n /spl plusmn/ 1 harmonics (n = 1, 3, 5, 7, etc.) coupled with 11th and 13th harmonic suppression. The proposed scheme also gives a smooth transition to the overmodulation region.
16. S.R. Munasinghe, M. Nakamura, S. Goto, N. Kyura, "Pole selection of feedforward compensators considering bounded control input of industrial mechatronic systems," IEEE Trans. on Industrial Electronics, vol. 50, no. 6, pp. 1199- 1206, Dec. 2003. Full Text Link
Abstract : A new pole selection method for feedforward compensators of mechatronic servo systems is presented in this paper. It is necessary to have the system poles located at desirable positions on the s-plane in order to realize better servoing performance. However, selection of new poles is not a straightforward problem and in most industrial mechatronic systems, it has been a mere cut-and-dry procedure. In this research, feedforward compensator poles are related to the control input, and a criterion was developed to determine the desirable poles that improve the control input within its limits. This method was developed for the second-order model and it was simulated and experiments were performed with the Performer MK3s articulated industrial robot manipulator. Some attractive results have been obtained with the new method.
17. Bong Keun Kim, Wan Kyun Chung, "Advanced disturbance observer design for mechanical positioning systems," IEEE Trans. on Industrial Electronics, vol. 50, no. 6, pp. 1207- 1216, Dec. 2003. Full Text Link
Abstract : Disturbance-observer (DOB)-based controller design is one of the most popular methods in the field of motion control. In this paper, the generalized disturbance compensation framework, named the robust internal-loop compensator (RIC) is introduced and an advanced design method of a DOB is proposed based on the RIC. The mixed sensitivity optimization problem, which is the main issue of DOB design, is also solved through the parametrization of the DOB in the RIC framework. Differently from conventional methods, the Q-filter is separated from the mixed sensitivity optimization problem and a systematic design law for the DOB is proposed. This guarantees the robustness and optimality of the DOB and enables the design for unstable plants.
18. Zhongming Ye, Bin Wu, A. Sadeghian, "Current signature analysis of induction motor mechanical faults by wavelet packet decomposition," IEEE Trans. on Industrial Electronics, vol. 50, no. 6, pp. 1217- 1228, Dec. 2003. Full Text Link
Abstract : This paper presents a novel approach to induction motor current signature analysis based on wavelet packet decomposition (WPD) of the stator current. The novelty of the proposed method lies in the fact that by using WPD method the inherent nonstationary nature of stator current can be accurately considered. The key characteristics of the proposed method are its ability to provide feature representations of multiple frequency resolutions for faulty modes, ability to clearly differentiate between healthy and faulty conditions, and its applicability to nonstationary signals. Successful implementation of the system for two types of faults, i.e., rotor bar breakage and air-gap eccentricity is demonstrated here. The results are validated based on both simulation and experiments of a 5-hp induction motor.
Power Electronics
19. P.M. Hunter, A.H. Anbuky, "VRLA battery rapid charging under stress management," IEEE Trans. on Industrial Electronics, vol. 50, no. 6, pp. 1229- 1237, Dec. 2003. Full Text Link
Abstract : This paper discusses an approach for closed-loop charge control of valve-regulated lead-acid (VRLA) batteries used in telecommunication standby power applications. This is an alternative to conventional preprogrammed, configuration-driven charge control. The developed approach uses the battery's response to the supplied charge to control the recharge process. In this way, only the energy that can be absorbed by the battery in the desired recharge operation is dealt with. Hence, excessive energy that causes battery stress, or lack of energy that slows the charging process is avoided. Two main sources of recharge stress are identified: (a) thermal stress, and (b) charge saturation stress. A charge control algorithm based on thermal management and charge saturation avoidance is suggested. The algorithm utilizes a fuzzy state-of-charge estimation model that derives the state of charge from real-time parameters. This in turn calculates the maximum recharge rate that maintains the battery's thermal rise within permissible limits.
20. Hong-Seok Song, In-Won Joo, Kwanghee Nam, "Source voltage sensorless estimation scheme for PWM rectifiers under unbalanced conditions," IEEE Trans. on Industrial Electronics, vol. 50, no. 6, pp. 1238- 1245, Dec. 2003. Full Text Link
Abstract : A source voltage sensorless estimation scheme is proposed for a pulsewidth-modulation (PWM) rectifier in unbalanced circumstances. The negative sequence is accompanied by the unbalance among phases, and acts as an ac disturbance to a normal-mode estimator and controller. Hence, without considering voltage unbalance, a PWM rectifier yields a voltage ripple in the dc-link voltage and large reactive currents. With the proposed sensorless scheme, both positive and negative components are estimated separately by using a full- (or reduced-) order estimator. The feasibility of the proposed sensorless scheme is confirmed through computer simulation and experiment.
21. P. D'Abramo, R. Roncella, R. Saletti, "A CMOS integrated driver for incandescent lamps with output power control," IEEE Trans. on Industrial Electronics, vol. 50, no. 6, pp. 1246- 1252, Dec. 2003. Full Text Link
Abstract : An integrated protection circuit to be used as a part of an intelligent power switch is presented in this paper. The circuit is designed to address the overcurrent solicitation due to incandescent lamp loads, typical in industrial and automotive environment. The circuit realizes, with a nonlinear feedback loop, an on-off switching of the load voltage as a function of the value of the load current, with the aim of keeping its mean value constant. This mechanism allows an efficient power transfer to the load, by minimizing the power dissipated on the MOS switch. Simulations and experimental measurements, carried out on a prototype chip fabricated with a 2-/spl mu/m CMOS high-voltage (50 V) process, are also shown.
22. Feng-Tian Han, Zhong-Yu Gao, Yong-Liang Wang, "Performance of a high-voltage DC amplifier for electrostatic levitation applications," IEEE Trans. on Industrial Electronics, vol. 50, no. 6, pp. 1253- 1258, Dec. 2003. Full Text Link
Abstract : High-voltage amplifiers as a means of amplifying the low-output voltage signals of the feedback controllers to the suspension voltages typically in the kilovolts range are often required for electrostatic force generation in electrostatic levitation. This paper proposes a high-voltage do amplifier including an amplitude modulator, a power amplifier, a step-up transformer, a pair of peak detectors, and a voltage feedback channel to stabilize the amplifier outputs in an effort to provide high suspension voltage and fast dynamic response. Since the various carrier frequencies have virtually no effect on the power consumption of the do amplifier by filtering out the high-frequency carrier components with peak detectors while keeping the input signal unaffected, satisfactory dynamic performance can be achieved by choosing a sufficiently high carrier frequency. The operating principle of the dc amplifier is analyzed, followed by an experimental performance evaluation and discussion for electrostatic levitation applications. The experimental results demonstrate the superiority of the high-voltage do amplifier over classical ac amplifiers in terms of dynamic response, force-voltage coefficient, voltage ripple, power consumption, and long-time stability using a carrier frequency of 30 kHz and the closed-loop control scheme.
23. Hyun-Lark Do, Bong-Hwan Kwon, "Single-stage line-coupled half-bridge ballast with unity power factor and ripple-free input current using a coupled inductor," IEEE Trans. on Industrial Electronics, vol. 50, no. 6, pp. 1259- 1266, Dec. 2003. Full Text Link
Abstract : A single-stage line-coupled half-bridge ballast with unity power factor and ripple-free input current using a coupled inductor is proposed. The proposed power-factor-correction circuit can achieve unity power factor and ripple-free input current using a coupled inductor. A saturable transformer constituting the self-oscillating drive limits the lamp current and dominates the switching frequency of the ballast. The proposed ballast has high energy efficiency, low cost, and high reliability compared to the conventional high-power-factor electronic ballasts. Experimental results obtained on a 30-W fluorescent lamp is discussed.
24. A.R. Seidel, F.E. Bisogno, H. Pinheiro, R.N. do Prado, "Self-oscillating dimmable electronic ballast," IEEE Trans. on Industrial Electronics, vol. 50, no. 6, pp. 1267- 1274, Dec. 2003. Full Text Link
Abstract : This paper presents a simple alternative for an electronic ballast operating in self-sustained oscillating mode with dimming capability for fluorescent lamps. A simple modification in one of the gate drivers side circuit allows the lamp to dim without compromising the simplicity, reliability, and low cost which characterize the self-oscillating electronic ballast (SOEB). A qualitative analysis is presented to explain the behavior of the proposed self-oscillating electronic ballast with dimming feature. In addition, the stability and the key equations for the design are derived using the extended Nyquist criterion and describing function method. Experimental results from two 40-W electronic ballasts are presented to demonstrate the performance and to validate the analysis carried out.
25. E.P. Wiechmann, R.P. Burgos, J. Holtz, "Active front-end converter for medium-voltage current-source drives using sequential-sampling synchronous space-vector modulation," IEEE Trans. on Industrial Electronics, vol. 50, no. 6, pp. 1275- 1289, Dec. 2003. Full Text Link
Abstract : This paper presents an active front-end converter for medium-voltage current-source drives. It comprises two series-connected pulsewidth-modulation (PWM) rectifiers fed from a delta-wye isolation transformer. These employ sequential-sampling synchronous space-vector modulation (SVM), and operate at a switching frequency of 100 Hz, thus reducing the switching losses by 66% compared to previous PWM approaches. Digital processing requirements of this technique are minimized by using decision-making SVM. This online modulation technique ensures full harmonic current cancellation through the magnetic interface, and minimizes the sampling/control-action delay. Therefore it enables the use of advanced control strategies notwithstanding the low sampling frequency of the control system. Exploiting this fact, the proposed converter is controlled using a nonlinear strategy in the synchronous frame. The strategy employs input-output and feedback linearization, and is derived from the complex-signal flow diagram of the converter. The proposed strategy linearizes and partially decouples the converter d-q-axes dynamics, ensuring a dynamic response totally independent from the operating point, even under regeneration. This is a highly desirable feature for high-performance drives presenting continuous transitions from motoring to regeneration. Moreover, the converter presents an independent active and reactive power flow, which enables it to operate as a reactive power compensator if desired. Computer analysis and experimental work with a TMS320C32 digital-signal-processor-based 5-kVA laboratory prototype validate the excellent results attained by the proposed converter.
26. G. Moschopoulos, "A simple AC-DC PWM full-bridge converter with integrated power-factor correction," IEEE Trans. on Industrial Electronics, vol. 50, no. 6, pp. 1290- 1297, Dec. 2003. Full Text Link
Abstract : A simple ac-dc pulsewidth-modulation (PWM) converter that can perform isolated dc-dc conversion while shaping the input current to improve power factor is proposed in this paper. The converter is almost the same as a standard PWM full-bridge converter with a diode rectifier/LC low-pass filter input except for some slight modifications. The converter topology is, therefore, very simple, as is the method of control used to achieve both power-factor correction and dc-dc conversion. In the paper, the operation of the converter is explained and analyzed, and the converter's steady-state characteristics are discussed. A design procedure for the selection of components is presented, and then demonstrated with an example. The feasibility of the converter, and its ability to meet EN61000-3-2 Class D standards for electrical equipment is shown with results obtained from an experimental prototype.
27. Byeong-Mook Chung, "Knowledge-based control for RGB convergence in deflection yoke of CDT," IEEE Trans. on Industrial Electronics, vol. 50, no. 6, pp. 1298- 1304, Dec. 2003. Full Text Link
Abstract : The color display tube used in computer monitors consists of many components. The deflection yoke (DY) among them supplies the vertical and horizontal magnetic fields so that the spatial trajectories of electron beams can be deflected according to the synchronization signals. If the magnetic fields are not correctly formed, color blurring or blooming where the color image on screen may not be clear will occur. It is misconvergence. In the manufacture of the DY, its quality is strictly controlled to achieve the desired convergence. If the misconvergence happens it has to be cured by sticking the ferrite sheets on the inner part of DY. However, the adjustment is not easy because this process requires an expert's knowledge and experience. A knowledge-based intelligent controller using a neuro-fuzzy model will be introduced in this paper.
Emerging Technology
28. S.H. Ling, F.H.F. Leung, H.K. Lam, P.K.S. Tam, "Short-term electric load forecasting based on a neural fuzzy network," IEEE Trans. on Industrial Electronics, vol. 50, no. 6, pp. 1305- 1316, Dec. 2003. Full Text Link
Abstract : Electric load forecasting is essential to improve the reliability of the ac power line data network and provide optimal load scheduling in an intelligent home system. In this paper, a short-term load forecasting realized by a neural fuzzy network (NFN) and a modified genetic algorithm (GA) is proposed. It can forecast the hourly load accurately with respect to different day types and weather information. By introducing new genetic operators, the modified GA performs better than the traditional GA under some benchmark test functions. The optimal network structure can be found by the modified GA when switches in the links of the network are introduced. The membership functions and the number of rules of the NFN can be obtained automatically. Results for a short-term load forecasting will be given.
29. Rong-Jong Wai, Jia-Ming Chang, "Implementation of robust wavelet-neural-network sliding-mode control for induction servo motor drive," IEEE Trans. on Industrial Electronics, vol. 50, no. 6, pp. 1317- 1334, Dec. 2003. Full Text Link
Abstract : This paper presents the design and properties of a robust wavelet-neural-network sliding-mode control (RWSC) system for an indirect field-oriented induction servo motor drive to track periodic commands. First, a total sliding-mode control (TSC) system with an integral-operation-switching surface, which is insensitive to uncertainties in the whole control process, is introduced. In the TSC system the controlled system has a total sliding motion without a reaching phase. Moreover, to relax the requirement for the bound of uncertainties, a wavelet-neural-network sliding-mode control (WSC) system is investigated to control the induction servo motor. In the WSC system, a wavelet neural network (WNN) is utilized to estimate the bound of uncertainties on line. In addition, an RWSC system is proposed to alleviate the chattering phenomena in the control effort. In the RWSC system, a boundary layer is introduced into the TSC system, and a WNN is used to estimate the width of the boundary layer and the uncertainty bound. Numerical simulation and experimental results due to periodic commands show that the dynamic behaviors of the proposed control systems are robust with regard to uncertainties. Furthermore, the advantages of the proposed RWSC system are indicated in comparison with the TSC and WSC systems.
30. S.T.S. Lee, H.S.H. Chung, S.Y.R. Hui, "An electrode power control scheme for dimmable electronic ballasts," IEEE Trans. on Industrial Electronics, vol. 50, no. 6, pp. 1335- 1337, Dec. 2003. Full Text Link
Abstract : A novel electrode power control scheme for dimmable ballasts is proposed. Dimming of the fluorescent lamp and control of electrode power are achieved by simultaneously adjusting the dc-link voltage and the switching frequency of the output inverter. The electrode power is derived by considering the near-orthogonal property of the lamp current and the resonant tank circuit current.
Letter to the Editor
31. Tao Zhao, Yung C Liang, "New actuation method for push-pull electrostatic MEMS comb drive," IEEE Trans. on Industrial Electronics, vol. 50, no. 6, pp. 1337- 1339, Dec. 2003. Full Text Link
Abstract : In this paper, a new actuation scheme for the push-pull electrostatic microelectromechanical systems comb drive actuators is proposed. The displacement amplitude excited by the new form of driving voltages can be more than three times as large as that which is achievable using the conventional form for the same applied system voltage.
32. O. Vainio, S.J. Ovaska, M. Polla, "Adaptive filtering using multiplicative general parameters for zero-crossing detection," IEEE Trans. on Industrial Electronics, vol. 50, no. 6, pp. 1340- 1342, Dec. 2003. Full Text Link
Abstract : An adaptive, robust, and computationally efficient disturbance reduction method for line-frequency zero-crossing detectors is proposed. Our adaptive system consists of a fixed finite-impulse response filter block and two multiplicative general parameters. The predictive filter is able to handle wide variations in the line frequency without harmfully adapting to the harmonic components.