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Power Electronics Specialists Conference, 1996. PESC '96 Record., 27th Annual IEEE

Date 23-27 June 1996

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Displaying Results 1 - 25 of 158
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  • An experimental neural controller implementing a VSC for a DC/DC PWM converter with power factor corrector

    Page(s): 1488 - 1493 vol.2
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    An experimental neural controller implementing a variable structure control (VSC) algorithm is proposed for a power factor corrector. VSC control laws yield fast response and a robust behavior against large parameters variations. A multilayer perceptron learns through backpropagation to approximate the desired control function. An simple analog electronic realization of this neural network using discrete operational amplifiers is proposed. This implementation possesses all the good properties of sliding mode while avoiding the unnecessary discontinuities of the control input and thus eliminating chattering. A simple analog electronic implementation of this controller is proposed. Experimental results are summarized confirming the validity of the neural network approach View full abstract»

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  • Single stage high power factor converter using the Sheppard-Taylor topology

    Page(s): 1191 - 1197 vol.2
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    This paper describes a new usage of the DC/DC converter developed by D.I. Sheppard and B.E. Taylor in 1983, for achieving high power factor and output regulation. This converter may be viewed as a cascade of a modified boost stage and a buck stage, with the two stages sharing the same active switch. Two possible operation regimes are described. In the first regime, the converter's input part, which is a modified boost converter, operates in discontinuous mode, and the output part, which is a buck converter, operates in continuous mode. In this regime, high power factor is naturally achieved and the output voltage is regulated by duty cycle modulation via a simple output feedback. In the second regime, the input part operates in continuous mode and the output part operates in discontinuous mode, with duty cycle modulation maintaining a high power factor and frequency modulation regulating the output. Compared to the usual boost-buck cascade operating in the first regime, the proposed converter has a wider operating range. When operating in the second regime, the modified boost stage has the ability of producing a harmonic free input current, unlike the standard boost PFC whose current always suffers a cusp distortion View full abstract»

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  • Elimination of common mode voltage in three phase sinusoidal power converters

    Page(s): 1968 - 1972 vol.2
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    The paper describes the addition of a fourth leg to the bridge of a three-phase inverter for the purpose of eliminating the common mode voltage to ground. An appropriate four-phase filter is used to eliminate common mode currents due to modulation. With a suitable modulation strategy and a three-phase LC filter on three legs of the inverter, sinusoidal output line-to-line voltages are obtained. A simple modification of the modulation strategy is implemented for the four-phase inverter to achieve a three-phase star output neutral to ground voltage which is equal to zero at all times. The modulation strategy thereby completely eliminates the common mode potential produced by traditional modulation techniques with traditional inverter topologies View full abstract»

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  • An on-line trained neural network with an adaptive learning rate for a wide range of power electronic applications

    Page(s): 1499 - 1505 vol.2
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    Artificial neural networks (ANNs) are particularly useful to represent the input-output relationships of nonlinear time-varying systems; such applications in power electronics and adjustable speed drives have been reported in the recent literature. Continuous online training of such systems requires high speed signal processing. Commercially available ANN hardware is too slow for fast power electronic systems. This paper proposes a new fast online random weight change training algorithm which uses an adaptive learning rate and is suitable for very high speed VLSI implementation. It requires little or no input from the user and is self-commissioning View full abstract»

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  • Dynamic analysis of inverter-fed ultrasonic motors

    Page(s): 1780 - 1786 vol.2
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    A rotary traveling wave type ultrasonic motor powered by a resonant power converter is analyzed by simulation to optimize the overall drive performance and to develop suitable control strategies for the drive. Based on a detailed simulation model for the total electromechanical system of the drive, various phenomena such as the well known pull-out phenomenon are verified by individual modeling aspects and explained by simulation. As the total characteristics are reflected by the simulation model and verified by measurements, a general control scheme for speed variable ultrasonic drives is suggested ensuring optimal torque utilization and minimized losses View full abstract»

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  • A DSP based control for a symmetrical three-phase two-switch PFC-power supply for variable output voltage

    Page(s): 1588 - 1594 vol.2
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    Power factor corrected rectifiers are new tendency in the development of power supplies. The present paper proposes a new simplified topology for three-phase applications, with only two active switches, which is able to generate symmetrical currents in the line. The power circuit and DSP control circuit are presented. Complete system modelization and simulation results with closed loop operation are given, as well as the results of an experimental verification View full abstract»

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  • Analytical estimation and reduction of conducted EMI emissions in high power PWM inverter drives

    Page(s): 1169 - 1175 vol.2
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    Analytical estimation of conducted electromagnetic interference (EMI) from a PWM drive system is presented. Analysis of transient behavior based on a simplified circuit model of components in a drive system is performed in both the time domain and the frequency domain. The basic models of the main circuit components responding to the switching action by power devices are described. A set of EMI suppression techniques for high power drives are proposed which have been confirmed by experiment to meet the CISPR standard limits at low cost View full abstract»

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  • Switching disturbance due to source inductance for a power MOSFET: analysis and solutions

    Page(s): 1743 - 1747 vol.2
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    In this paper some technological rules are given, in order to help the designer to choose correct parameter values (such as gate resistance), avoiding MOSFET switching disturbance due to common impedance coupling. The switching process is modeled, and the good understanding of switching disturbance leads to the desired technological rules, taking into account the MOSFET implementation (source inductance Ls) View full abstract»

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  • Accurate simulation of conducted interferences in isolated DC to DC converters regarding to EMI standards

    Page(s): 1973 - 1978 vol.2
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    The study presented in this paper concerns an accurate method of simulation of conducted EMI generated by DC-DC power converters (SMPS), in the frequency range and supplying conditions of European standards (10 kHz to 30 MHz). The aim is to develop a “circuit oriented” CAD tool for EMI problems study. Original models of semiconductors and magnetic components are proposed. Experimental results confirm, with a good accuracy, all simulations on a large frequency range. This method allows to optimise the design and cost of power converters and filters View full abstract»

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  • Highly dynamic torque control of synchronous reluctance motor

    Page(s): 1793 - 1797 vol.2
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    This paper presents a direct torque controller of a synchronous reluctance motor based on the stator current vector. The stator direct and quadrature voltages which can generate the desired torque are directly calculated from the machine model. A simple model without the core loss and a modified model which includes the core loss are considered in the proposed method. The results show that the fast and highly dynamic torque response can be obtained by the proposed method. The simulation and experimental results are presented to show the validity of the proposed method using the test synchronous reluctance motor View full abstract»

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  • Multilevel three-phase rectifier with sinusoidal input currents

    Page(s): 1595 - 1600 vol.2
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    A multilevel three-phase PWM rectifier absorbing sinusoidal and in phase mains currents is proposed in this paper. The article deals with this new structure, its control and the way to balance the voltage of the output capacitors in order to optimize its characteristics without disturbing the current waveform View full abstract»

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  • Experimental investigation of feedback linearization controller for switched reluctance motor

    Page(s): 1804 - 1810 vol.2
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    In this paper we propose a low cost implementable nonlinear controller for high performance speed regulation control of the SRM for direct-drive servo applications. We then present design of a feedback linearization controller for the SRM. Instead of decoupled control as proposed by previous researchers, we propose to use only one voltage regulator to feed all the four phases of the motor. This will result in an affordable drive system. Hardware implementation of the nonlinear controller has been achieved using Texas Instrument's TMS320C50 Digital Signal Processor. Experimental results obtained are also presented View full abstract»

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  • High-efficiency regenerative electronic load using capacitive idling converter for power sources testing

    Page(s): 969 - 974 vol.2
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    This paper presents a regenerative electronic load developed for testing in a didactic electrical machines laboratory, and which is also suitable for burn-in test of power supplies. The basic topology is a capacitive idling Cuk converter. This converter allows independent control of the input current and permits provision of a sinusoidal output current, while assuring the power balance. An appropriate gate command allows some soft-commutation without the use of any auxiliary circuit. Design criteria and experimental results of a 1 kW prototype are presented View full abstract»

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  • Input inductor current for unity power factor operation

    Page(s): 1177 - 1183 vol.2
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    A fixed frequency, fixed duty cycle boost converter with continuous input inductor current for unity power factor operation is introduced in this paper. The proposed boost converter has the same “voltage follower” (unity power factor) property as the conventional boost converter operating with discontinuous inductor current mode, but with continuous input inductor current. Thus, the proposed topology has much lower input harmonics and much better EMI performance than the conventional boost converter. By using the coupled inductor technique, the input inductor current ripple can be even dumped into another winding. Ripple free input inductor current is thus achieved. Therefore, the high frequency harmonic distortion can be avoided. The low frequency input current waveform distortion is analyzed. Simulation results are presented and compared with the conventional boost converter operating in discontinuous conduction mode. Compared to the well known Cuk and Sepic converters, the proposed boost topology has the advantages of lower switch voltage stress, lower switch current stress and lower voltage stress on capacitor Cs. The theoretical prediction is verified experimentally View full abstract»

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  • Optimized switching sequence for snubberless operation of bilateral MCT switches in AC resonant link converters

    Page(s): 1724 - 1730 vol.2
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    This paper revisits a discrete form of a bilateral switch that is used in AC resonant link power converters (ACRLCs). The active power device used is the MOS-controlled thyristor (MCT). The switch topology offers high levels of component integration, and increases the modular design of ACRLCs. However, the topology can cause problems due to the nonidealities of the solid-state devices. A simple solution to these problems is presented in the form of a switching sequence that allows all switches to theoretically commutate current at zero-voltage. Also, the proposed sequencing of the devices eliminates the need for snubber components. Simulation and experimental results are presented and discussed View full abstract»

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  • High power AC/DC converter for arc heater application: modelling and digital control design

    Page(s): 1613 - 1619 vol.2
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    The paper presents a practical experience on the design of a large power converter for an arc heater application. A dedicated model of the very complex structure of the plant has been realised and applied for the control development. The control development process is described and some simulation results are discussed View full abstract»

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  • PT-IGBT PSpice model with new parameter extraction for life-time and epy dependent behaviour simulation

    Page(s): 1682 - 1688 vol.2
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    IGBT PSpice models recently proposed do not give satisfactory simulation results of the behaviour of punch-through (PT) IGBTs. The reason can be attributed to the incorrect modelling of the particular epitaxial structure of the intrinsic PNP of the IGBT. In particular, the most critical behaviour to simulate accurately is the turn-off since such a transient is strongly influenced by the lifetime of the minority carriers and the reapplied voltage on the collector of the bipolar part of the IGBT. An improved IGBT PSpice model is presented aiming at overcoming the incompleteness of other models. A detailed procedure describing the parameter extraction of the model by new methods is also developed. The proposed model is validated by comparing several simulation runs with experimental traces on both static and dynamic conditions for both fast and slow IGBTs at different working conditions View full abstract»

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  • Control strategy for the double-boost converter in continuous conduction mode applied to power factor correction

    Page(s): 1066 - 1072 vol.2
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    This paper deals with the control strategy for the double boost converter in power factor correction (PFC) application, working in continuous conduction mode (CCM). This converter is based on the classic boost converter split into two parallel modules of power processing; each one of these modules process half of the nominal power of the converter. Technical literature concerning this converter does not analyze in detail some very important control aspects and it seems that it is still lacking a general control strategy for such converter. This subject is developed in the present paper. This is done by converter modeling based upon the PWM switch model. The model obtained, verified by simulations, points to a multivariable control system, since the converter output voltages and the control variables (duty cycle of the two active switches) are strongly coupled. The dynamic uncoupling technique is applied in order to overcome this undesirable characteristic and to design the voltage and current compensation loops. Each module of power processing has a current mode controlled PFC circuit with a current-regulation inner loop and a voltage-regulation outer loop and the dynamic uncoupling is performed over the former. Numerical simulation results of the behavior of the double-boost converter for power factor correction application are presented View full abstract»

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  • A new direct digital PWM technique for microprocessor-based PWM inverters

    Page(s): 1300 - 1304 vol.2
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    This paper describes a new pulse width modulation (PWM) scheme suitable for a microprocessor-based PWM inverter. Optimal switching patterns (i.e., width and position of the pulses) minimizing a performance index can be generated in real time by numerical calculation using the microprocessor-based control system. The switching patterns and harmonics of the output waveforms have been investigated by simulation. This PWM method is compared with conventional methods, such as the natural PWM and the direct PWM. The simulation results show that the proposed scheme has much less low-order harmonics than the other methods. Finally, the microprocessor-based implementation of the scheme is presented. The validity of the proposed method is verified by experiments using a microprocessor-based control system View full abstract»

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  • Intelligent transformer

    Page(s): 1337 - 1341 vol.2
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    A new concept of an intelligent power transformer is presented in this paper, where the size of a power transformer of commercial frequency is miniaturized by introducing a modulator. In this circuit, various functions, such as constant voltage, constant power and power factor correction are realized by a phase control system View full abstract»

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  • A hybrid PWM strategy combining modified space vector and triangle comparison methods

    Page(s): 1872 - 1878 vol.2
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    Classical space vector PWM with equal duration of application of zero state vectors V0 and V7 was modified. The time of application of vector V7 (and V0) was made changeable from 0 to 100% over the time T 0 for their combined application. The ratio of the duration of application of vector V0 vs. V7 can be kept constant or changed on a sample by sample basis with a significant impact on the characteristics of the PWM. Correlation between modified space vector and triangle comparison methods was established. It was proved in the paper that modified space vector PWM (with a classical space vector PWM as a special case) can be implemented as a triangle comparison method with added zero sequence. A new algorithm suitable for implementation of modified space vector method on digital or analog hardware for triangle comparison PWM was proposed. Because the algorithm combines the theory of space vector PWM with ease of implementation of a triangle comparison PWM it was named “hybrid” PWM (HPWM) View full abstract»

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  • IGBTs designed for automotive ignition systems

    Page(s): 1907 - 1912 vol.2
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    In recent years the IGBT has become the device of choice for driving ignition coils. The IGBT is a high-voltage, high-current device that is well suited to ignition applications which require 400 volts and 10 amps. Polysilicon diodes are integrated with the IGBT to form a high-voltage, gate-collector clamp for switching an inductive load. Second generation ignition IGBTs have been designed that meet ignition system requirements while using 40% less silicon than the previous generation View full abstract»

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  • New transformation for efficient DSP control of active power-line conditioners

    Page(s): 1317 - 1322 vol.2
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    This paper presents a new transformation scheme for the control of an active power-line conditioner, a power electronic device which is designed to suppress the power-line distortions caused by the nonlinear loads. Currently, the method of instantaneous power transformation is the most popular one for the active power-line conditioning control. This method uses the measurements of the power-line voltage and current to estimate the required harmonic compensation. The method requires much hardware for the measurements and many computations. The high accuracy hardware for measurements are costly and many computations can introduce truncation errors. Also, this method is sensitive to the power-line voltage measurements and may introduce control errors. A new simple transformation method is developed to overcome these difficulties. This control computes the correct harmonic compensation using the power-line current measurement only. This requires less hardware for the power-line voltages measurements and simplifies the computational processes. Unlike the traditional method, the accuracy of the new control method is not affected by the line voltage measurements, therefore, it is reliable under any power-line condition. An active power-line conditioner has been successfully developed to validate the accuracy and efficiency of the new control method. Typical test results are given in the paper View full abstract»

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  • A novel converter topology for switched reluctance motor drives

    Page(s): 1811 - 1816 vol.2
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    A new converter topology for switched reluctance motor drives is proposed in this paper. It has the advantages of minimum number of power switching devices, same voltage rating for all of them, variable DC link voltage for application to the motor windings to reduce the switching frequency of the phase switches and hence the switching and core losses but higher and fixed DC link voltage for faster commutation of phase currents. The converter provides a full four quadrant operation with the advantageous and important control features of independent energization and commutation of each phase winding. Further it requires no snubbing for its phase switches and only a minimum set of logic power supplies as all the phase switches have the same common. It has the disadvantages of requiring a chopper section with its attendant passive filter for reducing the DC link voltage for motor winding application. It is found that it is superior to many other (m+1) switch configurations, where m is the number of machine phases, due to the advantages described earlier. The principle of operation, modes of operation, design of the chopper stage, performance constraints and evaluation of the commutation time and rise in the source capacitor voltage for design of the machine side converter, merits and demerits of the proposed converter topology for the switched reluctance motor drives are systematically developed in this paper View full abstract»

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