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|Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 447.|
A methodology is described for the development of field-based, geometry-dependent circuit models which enable coupled field/circuit simulation of circuits containing magnetic components with hysteresis. Saber templates are developed for the field equivalent subcircuits representing the dynamic electromagnetic fields in the magnetic (ferrite), conductive (copper), and insulating elements, as well as for an interface network. Hysteresis models are included in the finite-element formulation of the ferrite model. Transient electromagnetic and circuit phenomena within and outside the magnetic components can be simulated simultaneously for a wide range of circuit topologies and excitation waveforms, using existing circuit simulators.
 S. Y. R. Hui and S. Sathiakumar, "Optimization of microprocessor-based random pwm schemes for power inverters with low switching frequencies," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 214.
The low switching frequency performance of the logical RPWM methods is examined under various modulation indexes and sampling frequencies. The optimal operating conditions for each logical RPWM scheme are highlighted. The RPWM schemes provide near ideal harmonic-free voltage waveforms and are suitable for both Mosfet and IGBT inverters.
 G. Ivensky, I. Zeltser, A. Kats, and S. Ben-Yaakov, "Reducing igbt losses in zcs series resonant converters," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 475.
The fundamental operational parameter that controls the losses in series resonant converters was found to be the (reflected) DC voltage transfer ratio. Losses which are a function of the average current (such as conduction losses of IGBTs and diodes) are independent of the switching frequency. Losses which are associated with the rms current are a function of both the (reflected) DC voltage ratio and the switching frequency ratio. Universal and normalized graphs, derived in this study, can be conveniently used to assess the expected rms and average current conduction losses under any given operational conditions. The residual switching losses in `ZCS' series resonant converters operating in Continuous Current Mode, can be reduced by simple current snubbers placed in the commutation circuits. The experimental results of this study confirm the theoretical predictions and demonstrate that the turn on snubbers can reduce switching losses by about 1.5% at a switching frequency of 65 kHz.
 P. Jain, D. Vincenti, and H. Jin, "Optimized single-phase ac power supply with dc bus synchronization," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 905.
In this paper, a new control technique for a single-phase ac power supply system is presented. By synchronizing the ac output with the dc bus ripple, only a very small dc bus capacitor is required. This improves the power factor and the quality of the input current. In addition, a simple integral control technique is introduced to control the PWM inverter. The performance of the system is analyzed and results are verified through experimental setup.
 Y. Jang and R. W. Erickson, "Design and experimental results of a 6 kw single-switch three-phase high power factor rectifier using multi-resonant zero current switching," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 524.
The design and breadboard implementation of a single-switch three-phase high power factor multi-resonant rectifier delivering 147 V (DC) at 6 kW from a 3φ 240 V (L-L, rms) AC input is described. This rectifier has continuous input and output currents. By the use of a multi-resonant scheme, the transistor operates with zero current switching and the diodes operate with zero voltage switching. This paper focuses on the design, implementation, and performance of the rectifier. High quality input current waveforms at nearly unity power factor, wide load range, and low stresses on the semiconductor devices are attained. The total harmonic distortion (THD) of the line current is less than 5% and the system efficiency is about 94% at full load.
 M. M. Jovanovic and D. E. Crow, "Merits and limitations of full-bridge rectifier with lc filter in meeting iec 1000-3-2 harmonic-limit specifications," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 354.
The feasibility of the single-phase, full-bridge rectifier with an LC filter to meet the IEC 1000-3-2, class D specifications is assessed. It is found that this passive LC-filter approach can meet the required specifications if a proper inductance value of the filter choke is selected. Choke design considerations and performance evaluation results that include the power loss, volume, and weight estimates for applications with power levels between 75 W and 600 W are presented.
 A. Julian, D. M. Divan, T. A. Lipo, F. Nozari, and P. A. Mezs, "Double bridge resonant dc link converter with variable input and output frequency," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 181.
A bi-directional resonant DC link (RDCL) converter is presented for use as a variable frequency to variable frequency (VF-VF) sinusoidal three phase power converter for aerospace applications. Three phase sinusoidal input up to 750 Hz and sinusoidal output up to 400 Hz is achieved using second order filters on the input and output of the converter. The results demonstrate active damping of the input and output resonance conditions. Input and output conducted current emissions, which contribute to inductively coupled EMI, are shown to be low. High efficiency, high power density, small DC bus capacitance and unity input power factor are some of the attributes of this converter topology.
 G. Jurasek, G. Levin, P. Sisson, and S. Repplinger, "High efficiency automotive power supply with hysteretic current mode controller," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 861.
A Switched Mode Power Supply for an Automotive Power Control Module with novel Hysteretic Current Mode Control (HCMC) controller is presented. The HCMC operation principle is described and a method of reducing switching frequency variation is analyzed. Experimental results and critical waveforms of the Power Switching Regulator are shown. Several monitoring and indication functions are designed into the controller to interface with the rest of the system. The controller includes a linear regulator to provide power for memory registers while the system is in the `Key-Off' state.
 V. Kaura and V. Blasko, "Operation of a phase locked loop system under distorted utility conditions," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 703.
Operation of a three phase - Phase Locked Loop-system under distorted utility conditions is presented. A control model of the PLL system is developed and recommendations are made on tuning of this model specially for operation under common utility distortions as: line notching, voltage unbalance/loss, frequency variations. The PLL is completely implemented in software. All analytical results are experimentally verified.
 E.-S. Kim, K.-Y. Joe, M.-H. Kye, and H.-H. Koo, "13 kw high frequency fb zvs dc-dc converter with additional capacitors," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 487.
The conventional phase-shifted zero-voltage-switching (ZVS) DC-DC converter is applied to the many power supplies in order to reduce the voltage and current stresses of the main switching devices. The ZVS method needs fairly large leakage inductance in the primary side of the high frequency power transformer to get good ZVS characteristics. Large leakage inductance results in several defects - small effective duty, high primary current and low efficiency etc. The proposed ZVS topology can get almost same ZVS characteristics even though the circuit has small leakage inductance. The proposed ZVS full - bridge(FB) DC-DC converter unit of 13 KW (125 V, 100 A) / 30 KHz for battery charger was designed, verified experimentally, and applied to real unit. This paper includes its operating sequence, simulation and experimental results.
 M. Kirschvink, L. Halbach, and M. Louges, "Interference suppression on motor connection cables for frequency converters," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 593.
It is a fact that frequency converters that operate asynchronous AC-motors are an inherent source of conducted and radiated interference. This attributes to the short pulse rise time of the modulated output voltage of the converter. Because the converter itself cannot be changed, the suppression of the interference is possible only through external means. For this reason, broadband inductive filtering is generally used to suppress the voltage peaks on the motor.
 M. Kneifel, D. Silber, and R. Held, "Predictive modeling of sic-device power schottky diode for investigations in power electronics," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 239.
A predictive electrical-thermal model for a silicon carbide (SiC) Power Schottky Diode based on semiconductor device equations and measured results has been developed for prospective behavior investigations of this device in different power electronic circuits. The model has been implanted in the circuit simulator SABER and is suitable to simulate static and switching power dissipation, EMI effects and several device failure modes.
 J. W. Kolar, H. Ertl, and F. C. Zach, "Design and experimental investigation of a three-phase high power density high efficiency unity power factor pwm (vienna) rectifier employing a novel integrated power semiconductor module," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 514.
Guidelines are developed for the practical application of a new power module (IXYS VUM25-E) realizing a bridge leg of a three-phase/switch/level PWM (VIENNA) rectifier system with low effects on the mains. The inner circuit structure of the power module is formed by a bidirectional bipolar switch (power MOSFET connected across the DC terminals of a diode bridge) and two free-wheeling diodes. An overview of the power loss contribution of the semiconductor elements is given, while the reduction of the efficiency caused by the total semiconductor losses is determined.
 R. Kollman, G. Collins, and D. Plumton, "10 mhz pwm converters with gaas vfets," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 264.
Switching speeds of currently available power switches have limited pulsewidth modulation (PWM) techniques to 1 to 2 MHz. High-speed (<2 ns switching) GaAs vertical field-effect transistors (VFETs) have overcome the limitation. These devices have been incorporated in 10 MHz, PWM, boost and buck 5 W power stages that have demonstrated good efficiencies (gt;85%) and very high power densities (500 W/in.3).
 R. Krishnan, S. Lee, and R. Monajemy, "Modeling, dynamic simulation and analysis of a c-dump brushless dc motor drive," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 745.
The novel application of the C-dump converter topology to the PM Brushless DC motor has recently been introduced. The converter requires minimum number of devices, and therefore, it is a very attractive choice for the emerging high volume variable speed drives. A comprehensive dynamic analysis of the drive system is necessary before such a product can be introduced to the market. The complete dynamic model of this drive system, along with analysis and experimental verification of key modes of operations, are systematically developed and introduced in this paper. Experimental verification is performed on a 4 quadrant 1 horsepower laboratory prototype PM brushless motor drive. The study enables sizing of the required components of the drive system, and estimation of the maximum commutation torque ripple, and hence, the suitability of the drive system for a desired application.
 C. C. Kuo, M. Y. Kuo, and M. S. Kuo, "Modeling and analysis of wideband power transmission line transformers," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 441.
The modeling and analysis of wideband transmission line transformers (TLTs) are presented in this paper. The innovative transmission-line impedance-based methodologies are proposed to evaluate the significant parameters of the transmission line first. The complete equivalent models of the basic 1:1 isolating TLT and high turns ratio TLTs are presented and the validity of this proposed models is confirmed by the excellent match between the simulated results and experimental data. Some important characteristics of high turns ratio isolating TLTs are discovered and discussed in this paper.
 Z. Lai, K. M. Smedley, and Y. Ma, "Time quantity one-cycle control for power factor correctors," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 821.
Time quantity one-cycle control method is proposed in this paper for unity power factor AC-DC converters. Converters controlled by this method operate at constant switching frequency, require no current sensing, have a simple control circuit, and exhibit purely resistive input impedance at the ac side. Feedback loop design method is provided to minimize the current distortion when the output voltage ripple is not negligible. Experimental results confirmed the theoretical prediction.
 J. A. Lambert, J. B. Vieira, Jr., L. C. de Freitas, M. S. Vilela, and V. J. Farias, "Boost pwm soft-single-switched converter without high stresses of voltage and current," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 469.
This paper presents a new Boost PWM soft-single-switched converter which, having only a single active switch, is able to operate with soft switching in a pulse with modulation way without high voltage and current stresses. In addition such converter can work in high switching frequencies for wide range of load. In order to illustrate the operating principle of this new converter a detailed study, including simulations and experimental test is carried out. The validity of this new converter is guaranteed by the obtained results.
 J. Lazar and S. Cuk, "Feedback loop analysis of ac/dc rectifiers operating in discontinuous conduction mode," in Proceedings of IEEE Applied Power Electronics Conference and Exposition, 1996, pp. 797.
High power factor rectifiers employing converters operating in discontinuous conduction mode (dcm) exhibit `automatic' current shaping and use output voltage feedback to regulate the output voltage. Analysis of this feedback control loop requires derivation of the control-to-output transfer function in the presence of the rectified ac source voltage. In this paper, linear, line frequency averaged control-to-output transfer functions are derived for some common dcm converter based rectifier topologies. Also, a new control scheme is analyzed which provides open loop correction for the nonideal input current of the dcm boost converter, giving it unity power factor. Finally, a simple method of providing `fast' output voltage regulation under transient conditions is introduced.
 B. K. Lee, S. B. Yoo, B. S. Suh, and D. S. Hyun, "New class-d voltage source series-loaded resonant inverter topology considering stray inductance influences," in