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|Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 932.|
In this paper, a new technique for shaping the line current and reducing the total harmonic distortion in a three-phase bridge rectifier, feeding a capacitive load, is presented. Using the topology proposed by Ewaldo et al , a new control technique has been implemented. The main objective here is to minimize the THD of the line current under different load conditions (20% to 100% of full load). A review of the problems inherent in a bridge rectifier feeding a capacitive load and the possible solutions are first presented. Subsequently, the analysis of the new circuit, and the control technique used are described along with simulation results. Finally the experimental results on a 1.6 kW prototype are presented.
 P. A. Davis, "Approach to power supply market segmentation (or finding the common ground)," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 41.
Market segmentation can go a long way toward making standardized building blocks possible. By analyzing the specifications which come with RFQs market segments can be found. An overview of this process will be presented in this paper.
 P. A. Davis, "Marketing for engineers: Great devices are not the same things as great products," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 7.
Engineering and Marketing don't always work in harmony with one another. Frequently this is due to the lack of understanding of what it takes to make a successful product in the market. This paper highlights for the engineer some of the basic tenants required for a successful product.
 E. P. de Paiva, L. C. de Freitas, V. J. Farias, E. Antonio, A. Coelho, and J. B. J. Vieira, "Quasi-resonant zero-current-switching buck pwm converter using a non-linear resonant inductor," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 318.
This paper shows a lossless commutation cell that uses a non-linear resonant inductor. The principle of the nonlinear resonant inductor is applied to a QRC-ZCS-PWM buck converter with the objective of reducing the peak current in the main switch, maintaining the ZCS characteristics of the QRC-ZCS-PWM buck converter. This is achieved by unsaturating the core of the non-linear resonant inductor limiting its peak value. The proposed converter has the following advantages: (1) lower current stress in the main switch; (2) the current peak value stays almost fixed with the load increase; (3) it operates with fixed frequency; (4) it has lossless commutation.
 D. A. Deib and J. M. S. Kim, "Modelling and control of a new dc-side shunt-type nonlinear switching filter," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 121.
This paper presents the design, modelling, and control of a new dc-side shunt-type, current-source, voltage-hysteresis-controlled, high-frequency switching filter. The concept and principle of operation of the new switching filter are described. System design equations are developed to model the relationship among circuit variables. A multi-loop closed system is proposed to regulate the load current and maintain the switching filter dc link current at fixed level. The salient features of the proposed filter type are the reduced filter converter rating, reduced size of passive elements, and the elimination of the auxiliary power supply that has been used for the dc link of active filters. System analysis and control design are verified with simulation.
 D. Diamantidis, R. Krishnan, and S. Lee, "Design and development of a low cost inverter drive for induction motors," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 771.
Low cost inverters and their accompanying controllers were developed for one horsepower variable speed induction motor drives. The issues addressed to achieve low cost and ease of operation are: specifications, control circuit design and layout in printed circuit boards, power circuit layout, switching and conduction losses, tuning, development of compact cooling arrangement, ease of manufacturability and packaging.
 J. W. Dixon and J. N. Rivarola, "Improved method to measure speed in induction motors, based on induced irregularities," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 399.
This work presents a method of speed estimation for induction motors, based on the introduction of dynamic irregularities in the rotor. The method allows to increase the amplitude of the speed signals more than ten times with respect to normal eccentricities, without affecting the normal operation of the machine. With this method, and using only one eccentricity per pole, it has been shown that it is possible to measure speeds as low as 11 rpm. Adding more than one eccentricity per pole, it is possible to measure even lower speeds. Simulations and experimental results permit to compare this new method, with methods which use only normal eccentricities.
 A. Elasser, V. Parthasarathy, and D. A. Torrey, "Study of the internal device dynamics of punch-through and non punch-through igbts under zero-current switching," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 250.
The effective use of IGBTs requires a good understanding of their internal device physics. This understanding is essential for the optimal interaction between the IGBTs and their snubber elements. As switching frequencies are pushed to higher values, switching loss reduction becomes an essential part of the design and optimization process. Soft switching techniques (ZVS and ZCS) are widely used for this purpose. This study provides insight into the internal dynamic behavior of IGBTs under zero-current switching. This is accomplished through mixed mode simulation, providing the necessary insight for the improvement of circuit and device performance. In particular, we have analyzed the behavior of the negative current in the non punch-through device after the first zero-current crossing and the effect of the turn-off delay on the tail current.
 M. S. Elmore, "Input current ripple cancellation in synchronized, parallel connected critically continuous boost converters," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 152.
In high power factor AC-to-DC applications boost converters operating on the boundary of continuous mode and discontinuous mode switch with variable frequency and draw high peak input currents. A method is presented to parallel two or more of these converters to reduce the high peak input currents. Each converter continues to operate on the boundary of continuous mode and discontinuous mode and maintains the benefits of zero-voltage switching.
 H. Ertl, J. W. Kolar, and F. C. Zach, "Basic considerations and topologies of switched-mode assisted linear power amplifiers," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 207.
The paper presents a combined power amplifier system consisting of a linear amplifier unit with a switched-mode (class D) current dumping stage arranged in parallel. With this topology the fundamental drawback of conventional linear power amplifiers - the high loss - is avoided. Compared to a pure class D (switching) amplifier the presented system needs no output filter to reduce the switching frequency harmonics. This filter (usually of multi-stage type) generally deteriorates the transient response of the system and impairs the feedback loop design. Furthermore, the low-frequency distortions of switching amplifiers caused by the interlock delay of their power transistors are avoided with the presented switched-mode assisted linear amplifier system. This can be considered as a master-slave system with a guiding linear amplifier and a supporting class D slave unit. The paper describes the operating principle of the system, analyzes the fundamental relationships for the circuit design and presents simulation results. Finally, various further topologies of switched-mode assisted linear amplifiers are given.
 B. Fatemizadeh, G. Tchouangue, and D. Silber, "User-optimized electro-thermal igbt model for power electronic circuit simulation in the circuit simulator eldo," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 81.
We present a user-optimized electro-thermal IGBT model for power electronic circuit simulation. The proposed model has been efficiently implemented in the circuit simulator ELDO in the purpose of reaching low simulation time and high convergence safety. The relevant physical effects are considered as well as different device design structures. The number of model parameter is reduced to a minimum since some of them are internally calculated.
 T. Faucett, "Benchmarking: A comparison of electronic manufacturing techniques of ten major manufacturing organizations," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 69.
This paper describes a comparison of the manufacturing techniques of ten major electronic equipment manufacturers. A broad cross section of companies performing analog and power component assembly was used. These companies were geographically distributed across the United States and one in Mexico. Each manufacturing plant was toured and-manufacturing engineers interviewed.
 K. Fischer and K. Shenai, "Ultra-high performance rugged scaled power mosfets for high-frequency power conversion," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 270.
The ruggedness and performance of ultra-high density low-voltage power MOSFETs are reported. It is shown that rugged power MOSFETs with ultrahigh static and switching performance can be developed using scaled silicon technologies. The experimental results are supported with extensive numerical simulations which clearly show important physical effects as the technology is scaled.
 J. Garcia, G. Dauphin-Tanguy, and C. Rombaut, "Electrothermal bond graph model for semiconductor switching devices," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 258.
A methodology for modeling and simulating the electrothermal behavior of power semiconductor switching devices is illustrated and validated. The electrothermal model is constructed using the bond graph formalism. This bond graph model is centered around the idea of having a single model regardless of the switch state. The electrothermal model describes the dynamic temperature distribution of the device from the chip surface through the package and heatsink, and the influence of the chip temperature variation on the electrical characteristics of the device.
 M. Ghassemzadeh, A. M. Trzynadlowski, and S. F. Legowski, "Detection of speed oscillation in induction motor drives using the instantaneous stator power," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 394.
Oscillation of speed in an induction motor drive indicates mechanical imperfections and/or vibration in the drive system. For the purpose of non-invasive diagnostics, analysis of the power spectrum of stator current is usually employed for the detection of speed oscillation. In this paper, another medium, namely the instantaneous stator power, is investigated. It is shown that the power spectrum of instantaneous stator power contains the so-called characteristic component directly at the frequency of oscillation. Theoretical analysis and supporting results of laboratory experiments are presented.
 L. Gilbert, "Alternate sourcing of custom power supplies. Is it a responsible investment of valuable resources?" in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 61.
This presentation will focus on alternate source issues to be considered with custom power supplies AFTER a product has been released to production by an OEM from the suppliers' point of view.
 Y. Haiqing, S. K. Panda, and L. Y. Chii, "Performance comparison of feedback linearization control with pi control for four-quadrant operation of switched reluctance motors," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 956.
In this paper we present a performance comparison of conventional PI control and feedback linearization control (FBLC) for switched reluctance motors (SRMs). A feasible low cost nonlinear controller is then suggested for high performance speed regulation control of the SRM for direct-drive servo applications. We present the design of a robust FBL controller based on a nonlinear mathematical model (which takes magnetic saturation into account) of the SRM. Instead of decoupled control as proposed by previous researchers which requires m voltage regulators (choppers) for a m-phase motor, we propose to use only one voltage regulator in this work. This will reduce the cost of the drive system significantly. Multiphase-excitation scheme is adopted in our controller design for the purpose of exploiting higher power as well as minimizing torque ripple. Simulations for the drive system have been carried out. Robustness is tested against the most critical parameter uncertainties such as phase resistance. A robust ripple-free nonlinear controller is achieved for the SRM drives, whose performance outweighs that of PI controller.
 X. He, S. J. Finney, B. W. Williams, and Z. Qian, "Novel passive lossless soft-clamped snubber for voltage source inverters," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 200.
A novel passive lossless soft-clamped snubber circuit for voltage source inverters is proposed. The energy trapped in the inductive turn-on snubber is recovered into the DC supply and load, without any active devices, associated control circuitry or resistors. The overshoot voltage on the main power switches is clamped and the peak switch current is low. This snubber circuit is suitable for use in high power Insulated Gate Bipolar Transistor (IGBT) inverters.
 L. Heinemann, "Simulation and design of high frequency magnetics including the skin effect, nonlinear core properties and thermal effects," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 461.
Simultaneous consideration of electrical high frequency multiwinding transformer and inductor models, thermal models and nonlinear core models during network simulation is discussed and presented. Simulations of a switched mode power supply and comparisons with measurements demonstrate the accuracy of the method proposed.
 W. Hofmann, "Practical design of the current error trajectory control for pwm ac-drives," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 782.
A simplified method of predictive current control used for ac-drives fed by PWM-inverters is proposed, which works with a fixed pulse frequency. Going out from a reduced equivalent network describing the stator circuit for a field oriented machine the linear array of mathematical equations is given to determine the pulse-times of the switched voltage space vectors. The gradients of the current error vector determined before leave its mark on the parameters of the array just as the initial and final points do it. Some variants are compared with another for the trajectories with regard to the maximum and the rms-value of the control error. The control principles are modified for the special control ranges including the speed zero and have been used in an industrial drive system with a medium power range.
 J. T. Hsu and K. D. T. Ngo, "Field-based finite-element circuit models for magnetic components with hysteresis," in