| EPE 1999 - Topic 02: POWER ELECTRONICS CONVERTER CIRCUITS | ||
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| | EPE 1999 - Topic 02a: Soft Switching Converters (Resonant, ZVS, ZCS) | |
| In this category, the user will find the papers which were presented during the EPE 1999 Conference, related to "Soft Switching Converters (Resonant, ZVS, ZCS)" | ||
| | EPE 1999 - Topic 02b: Power Converter Circuits and Control | |
| In this category, the user will find the papers which were presented during the EPE 1999 Conference, related to "Power Converter Circuits and Control" | ||
| | EPE 1999 - Topic 02c: Multilevel and Matrix Converters | |
| In this category, the user will find the papers which were presented during the EPE 1999 Conference, related to "Multilevel and Matrix Converters" | ||
| | EPE 1999 - Topic 02d: Emerging Topologies | |
| In this category, the user will find the papers which were presented during the EPE 1999 Conference, related to "Emerging Topologies" | ||
 | A 1kW AC-to-DC Zero Voltage Transition Sepic Converter in a 1kW AC-to-DC Power Factor Correction Application
By M.Hernando; P.Villegas; J.Sebastián; A.Fernández; J.Cardesín | |
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Abstract: This paper shows an AC-to-DC SEPIC converter in a 1kW Power Factor Correction application. The
main transistor is an IGBT, so a soft-switching technique must be implemented in order to have high
frequency operation. The soft-switching technique selected was the Zero Voltage Transition. This
technique provides soft-switching in a wide range of input and output voltages without additional stress
in the semiconductors. The control method implemented was the Averaged Current Mode Control.
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| | Capacitor Voltages in the Imbricated Cell Topology: Generalization of the Variation Results
By C. Saudemont; J.P. Cambronne; C. Rombaut | |
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Abstract: Reduction of switch terminal voltage constraints is the main interest of imbricated cell converters. However, this advantage is effective if floating voltages are balanced around defined values. The interest of this work is to give a physical explanation of the capacitor charge, and to deduce a model dependent on the load, the topology and the control parameters.
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| | Comparison of Control Strategies for SR Full-Bridge Inverter for Induction Cookers
By F. Monterde; P. Hernánde; J. M. Burdío; J. R. Garcia; A. Martínez | |
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Abstract: Power inverters for induction cookers are generally controlled varying frequency to control output
power. This leads to acoustic noise in multiple-burner cookers when more than one inverter operates
at different frequencies. Suppression of audible noise requires fixed-frequency controls. This paper
compares fixed-frequency control strategies for series-resonant full-bridge inverter for induction
cookers.
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| | DC Voltage Ripple Suppression in Three-phase Buck Diode Rectifiers with Unity Power Factor
By J-H. Song; D-Y. Lee; Y-D. Kim; I. Choy; J-Y. Choi; G-S. Kim | |
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Abstract: A technique to suppress the low frequency ripple voltage of the dc output voltage in threephase
buck diode rectifiers is presented. A pulse frequency modulation method is employed to
regulate the output voltage of the rectifier and guarantee zero-current switching of the switch over the
wide operating region. The pulse frequency control method used in this paper shows generally good
performance such as low THD of the input line current and unity power factor. In addition, the pulse
frequency method can be effectively used to suppress the low frequency voltage ripple appeared in the
dc output voltage. The proposed technique illustrates its validity and effectiveness through the
respective simulations and experiments.
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| | DC-DC Converters for Two-Quadrant Operation with Controlled Output Voltage
By N. Schibli | |
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Abstract: A DC-DC converter is proposed with new modulation schemes for a voltage-controlled output. The
DC-DC converter is designed for a reversible current in order to feed DC current motors or four quadrant
converters, which need a galvanic separation from a DC source. The output voltage is stabilized
while the load current can change rapidly. The new modulation method reduces the losses by 50%.
Experimental tests have been made on a 20kW prototype.
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| | DC-link Voltage Balance in AC/DC/AC Multilevel Converters
By M. Marchesoni; M. Mazzucchelli; F. V. P. Robinson; P. Tenca | |
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Abstract: The DC-link capacitor voltage balancing problem in Multi Point Clamped (MPC) power converters is simplified when an MPC rectifier and an MPC inverter are used together. However, it is not widely appreciated that even than automatic capacitor voltage balancing is not achieved and a modified PWM strategy must be used. It is shown analytically that AC/DC/AC MPC converters, under the control of standard PWM modulation strategies, rarely give correct balance and that this may be reliably achieved by implementing a balancing strategy. The derived generalized model has been verified by comparing results with those for converters with specific numbers of output levels.
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| | Design Problems and Real Characteristics of Practical ZVS-QRCs
By E.C. Tatakis; N.P. Polyzos | |
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Abstract: Measurements that were performed on breadboarded Zero-Voltage Switching Quasi-Resonant Converters
(ZVS-QRCs) demonstrate an important deviation between the theoretical output characteristics which are
obtained from the theoretical analysis, that is based on the assumption of ideal components, and the
experimental ones. The aim of this work is to present a detailed study, based on measurements and
simulations, of different ZVS-QR topologies (Buck, Boost, Buck-Boost and Flyback) and investigate their
real behavioural characteristics. For this purpose a simulation program was developed, in order to evaluate
the losses on each converter component and estimate their influence at the efficiency of the converter.
Moreover, some critical problems concerning the design and the implementation of this kind of converters
are pointed out and analytically discussed, aiming to their easier implementation.
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| | Dynamic Analysis and Control Design of the LCL Type Resonant Converter
By S. Zouggar; H. Nait Chrif; G. Roja; M. Azizi | |
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Abstract: This paper presents a method for the analysis of the LCL type resonant converter in
dynamic regime. Using the large signal model, small signal model of this converter is obtained around the
operating point. The open loop small signal model is embedded within a feedback control loop. A closed
loop is analyzed using symbolic computation software
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| | Energy-Efficient Alternative Current Electrical Drives with ZC/DC/AC Converters
By R. T. Schreiner; A. A. Efimov; A. M. Zinoviev; A. M. Smekhnov; A. I. Kalygin | |
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Abstract: Presented are the functional diagrams of the alternate current electric drives with asynchronous and hysteresis electric motors with frequency converters which contain active rectifiers. Mathematical models of the active voltage and current rectifiers as well as the voltage source inverter-asynchronous motor and a current source inverter-hysteresis electric motor systems were developed. A unique PWM algorithm for the active current rectifiers was proposed, and a vector control system for the active voltage rectifier was developed.
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| | High Voltage Test Amplifier for Ozone Production
By O. Arnaud | |
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Abstract: As part of its research into ozone production, EDF’s Research and Development Division needed a
power supply to enable testing of different waveforms. This resulted in the signing of a contract with
CIRTEM for development of a high-voltage test amplifier.
This amplifier, controlled by a programmable signal generator, is capable of generating a wide range
of waveforms (sinusoidal, triangular, square, pulse, plus a possible DC component) at different
frequencies.
To comply with the technical specifications, the amplifier developed by CIRTEM comprises 16
inverters in series. The control law for the inverters enables multi-level pulse width modulation
(PWM).
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| | Internal Model Control for DC/DC Converters
By I. Gadoura; T. Suntio; K. Zenger; P. Vallittu | |
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Abstract: In this paper, the internal model control (IMC) method is applied to DC/DC converters. IMC scheme
is used to improve the dynamic performance of a converter to achieve the desired output voltage
despite load disturbances. The ac small-signal model is derived to obtain the transfer functions of
IMC structure. The simulation results show good dynamic performance of the IMC controller.
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| | Modular Power Converter (MPC) IGBT-Converter Series for High Power Applications in Electrical Traction
By T. Lüttin; I. Herbst; U. Meyer | |
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Abstract: This paper expands on the use of high blocking snubberless IGBT technology in a new generation of
high power traction converters. The features and the application spectrum of the Modular Power
Converter (MPC) are described in detail. The modular concept, as determined by the mechanical
design including the cooling system, are explained.
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| | Modular Power Converter Topology allows Induction Heater to Draw Three-Phase Input Current with High Power Factor and Low Utility Current Distortion
By H.I. Sewell; D. A. Stone | |
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Abstract: The paper describes the investigation of a modular pulse width modulation controlled induction heater system, designed to draw sinusoidal currents from a multi-phase utility supply system. The development of the model will be described together with practical verification of the results produced.
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| | Multilevel Converters Industrial Interest
By J. Courault; O. Lapierre; J. L. Pouliquen | |
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Abstract: Medium voltage converters with overlapped cells, imagined by professors Foch and Meynard, come under a particularly innovative topology. This article refers to the aroused industrial interest, towards the supplied loads (mainly motors) and the particularly simple commissioning which leads to a high reliability.
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| | Multiple-Output Series-Resonant Inverter for Induction Cookers
By F. Monterde; P. Hernández; J. M. Burdío; J. R. García; A. Martínez | |
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Abstract: Generally induction cookers have one inverter per burner. This paper introduces a novel seriesresonant
multiple-output topology, allowing output power to be controlled up to rated power
independently for every burner. Furthermore, all of the installed power can be applied to only one
burner, obtaining a quick heating function in order to speed-up cooking times. It uses the new
unipolar voltage-cancellation control, minimising the risk of ZVS loss.
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| | Pulse Modulated Vertical Deflection Amplifier in TV-sets
By T. M. Frederiksen; N. B. Larsen; M. A. E. Andersen | |
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Abstract: This paper addresses power loss reduction in the power amplifier driving the vertical deflection coil
in TV-sets making use of PWM switch mode technology newly introduced with success in audio
power amplifiers driving loudspeakers. It will be shown that efficiency in the output stage of the
vertical deflection amplifier can be increased from 48% to 63% on a 2.3W output.
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| | Resonant Inverters with Improved Output Characteristics in Application for Corona Discharge Treatment
By J. Mucko; R. Strzelecki; J. Kozakiewicz; S. Lutomirski | |
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Abstract: In ths paper the topology of the inverters with resonant circuits, which make possible to realise systems with stable output characteristics has been represented. These systems are characterised by properties of the current source or voltage sources. They also effectivily filter out higher harmonics. Befor we go on to obtain results presented in the paper, we experimentally investigated a series resonant inverter with the parallel load. It is applied for activation of the polyethylene film. The corona discharge treatment unit being in serialised production of installed power 4kW and frequency in the range of 10...40kHz has been used in the experiment.
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| | Series Load-Resonant Converter with an Auxiliary Resonant Commutated Pole Circuit for Controlled-Current Arc Welding Power Supply
By F. X. Fifatin; S. Pierfederici; B. Davat | |
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Abstract: An arc welding power supply requires the ability to easily adapt output voltage under output current to
maintain a good arc for welding. The high frequency operation of the converter minimizes the size of
the magnetic components and reduces output current ripples. This paper presents a new method to
control arc welding power supply. Contrarily to the classical proposed methods [1, 5, 6, 12], a nondissipative
snubber is added to the inverter and a control scheme based on the relationship between the
chosen materials and its voltage-current characteristic is implemented. This helps to control burnback
and the quantity of welding wire, which is deposited. The power converter used is a serial resonant
inverter and the power control is realized by a variation of the duty cycle at the resonance frequency
(phase shift control). The systematic control of the power output and the locking to the resonant
frequency are realized by a DSP.
A converter with an output voltage of 25 V and output current of 200 A operating at 80 kHz has been
designed and constructed. Simulated and experimental results of the converter are presented.
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| | Sliding Mode Control of Space Vector Modulated Matrix Converter with Sinusoidal Input/Output Waveforms and near Unity Input Power Factor
By S. Ferreira Pinto; J. Fernando Silva | |
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Abstract: The modelling of a three-phase ac-ac matrix converter with an input 'LC' filter is presented and sliding mode controllers are designed in order to guarantee sinusoidal input and output waveforms at near unity input power factor. First, the matrix converter model, considering the high frequency input filter is obtained in 'aB' coordinates, using the Concordia transformation. The sliding mode controllers are designed based on this model, together with the state-space vectors modulation technique, which allows a more efficient choice of the switching strategy. The sliding mode guarantees a robust on-line control of the matrix converter output voltages and input currents, with near unity input power factor. In order to confirm the expected performance, simulation results are obtained and discussed.
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| | Three Self-Resonant PWM Forward Converter Presented in a Comparat...
By C. P. Dias; A. A. Pereira; J. B. Vieira Jr; V. J. Farias; L. C. de Freitas | |
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Abstract: This paper presents a comparison of efficiency between three Self Resonant PWM Forward
converter. This structures are the association of the dissipative two transistors PWM Forward
converter with a non-dissipative cell in three distinct way. The complete operating principle,
relevant equations, simulation, experimental results and efficiency of the three structures are
presented.
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| | Use of the Transformer Polygon Equivalent Circuit in Analysis of the Input Converter in AC Traction Drives
By G. Skarpetowski | |
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Abstract: A closed analytical description of the AC supplied traction drive input circuit, including model of the
single phase, multi-winding traction transformer and a model of the line side 4 quadrant converter is
presented. The main attention is directed to the mathematical model of the multi-winding traction
transformer. The polygon network model of the “N” windings traction transformer is based on
0.5*(N-1)*N short circuit impedance measurements. The short circuit impedance is represented as a
serial connection of frequency dependent resistors and frequency dependent inductors. The described
transformer model is limited to the frequency range applied in short circuit measurements. The
presented method, applied by the author, increases the accuracy of traction converter input circuit and
harmonic filter dimensioning, allows for more exact calculation of current distortion and line
converter components stresses.
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