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Applied Power Electronics Conference and Exposition, 2002. APEC 2002. Seventeenth Annual IEEE

Date 10-14 March 2002

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  • Seventeenth Annual IEEE Applied Power Electronics Conference And Exposition [front matter]

    Page(s): i - xxxi
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    Freely Available from IEEE
  • Author index

    Page(s): 1221 - 1224
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    Freely Available from IEEE
  • Integrated magnetic full wave converter with flexible output inductor

    Page(s): 824 - 830 vol.2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (373 KB) |  | HTML iconHTML  

    A new integrated magnetic full wave DC/DC converter is introduced. This converter incorporates an independent output inductor winding within the traditional three-leg magnetic core structure. The inductor winding can be separately designed to control the output current ripple. The cross-sectional area of the inductor core leg can be reduced dramatically. The operation and performance of the proposed circuit were verified on a 100 W prototype converter View full abstract»

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  • Indirect field orientation for induction motors without speed sensor

    Page(s): 809 - 814 vol.2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (610 KB) |  | HTML iconHTML  

    This article investigates a modified indirect field oriented control strategy that employs a direct estimation of the frequency of the rotor flux vector. The estimate of the frequency of the rotor flux vector is obtained from the directly measurable stator currents and voltages, and is completely independent of the rotor resistance. The proposed scheme can be used in applications where there is no need for speed control or simply to insure the independency of rotor resistance. Experimental results are presented and demonstrate the performance, correctness and feasibility of the proposed methodology View full abstract»

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  • A digitally-controlled, low-cost driver for piezoceramic flight control surfaces in small unmanned aircraft and munitions

    Page(s): 1154 - 1160 vol.2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (685 KB) |  | HTML iconHTML  

    A digitally-controlled, low-cost driver for piezoceramic flight control surfaces in miniature aircraft and munitions has been developed. The piezoceramic material, being capacitive, requires ±DC voltages for bi-directional deflection. Accordingly, the driver is a variable output capacitor charger with bipolar output voltage. Output voltage slew rate is also variable, providing rate-of-closure adjustment. Overvoltage protection is elegantly provided without additional components while a microcontroller handles serial data transfers from a remote targeting system and gating of MOSFETs within the driver. Measured performance and mathematical predictions are in agreement and loss mechanism are identified and modeled View full abstract»

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  • Simplified input current waveshaping technique by using inductor voltage sensing for high power factor isolated Sepic, Cuk and flyback rectifiers

    Page(s): 1208 - 1214 vol.2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (547 KB) |  | HTML iconHTML  

    This paper, a new simple current waveshaping technique in CCM by using inductor voltage sensing for high power factor rectifier based on isolated Sepic, Cuk, and flyback converters is introduced and experimented. The duty ratio is obtained by comparing an integral signal of the rectified inductor voltage and a negative ramp carrier waveform. Using the proposed control technique, input voltage sensing, error amplifier in the current feedback loop, analog multiplier/divider, and current sensing are not required View full abstract»

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  • Improving the dynamic response of active power filters based on the synchronous reference frame method

    Page(s): 742 - 748 vol.2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (412 KB) |  | HTML iconHTML  

    This paper presents a new strategy for improving the dynamic response of active power filters that use the synchronous reference frame method (id-iq method). The strategy is based on the substitution of conventional filtering by a efficient, faster and simpler process requesting less computational burden. Such modification produces a faster transient response during compensation process that lasts 1/6 of the fundamental voltage period (or 1/3, if there is even order harmonics in the currents). Due to its fast response, the proposed modification makes it possible the application of the id-iq method to a single phase. With such a feature, this method becomes suitable for the harmonic compensation of unbalanced loads, still keeping a fast dynamic response. The paper describes the strategy and presents the simulations and the experimental results View full abstract»

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  • A ZVT PWM boost converter using an auxiliary resonant source

    Page(s): 1101 - 1107 vol.2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (571 KB) |  | HTML iconHTML  

    This paper proposes a zero-voltage transition (ZVT) PWM boost converter with a resonant auxiliary circuit. It enables the main switch to be turned on and off with zero voltage and the auxiliary switch to be turned on and off with zero current. Additionally, all diodes commutate under soft conditions. The soft-switching conditions are achieved without penalizing the converter conduction losses and they can be maintained for a wide line and load ranges. The converter operation is explained and analyzed, and its feasibility is confirmed by experimental results obtained from a 1 kW, 100 kHz laboratory prototype. It is demonstrate a gain in efficiency about 1.4% higher than the conventional ZVT PWM boost converter View full abstract»

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  • A family of compound active-clamping DC-DC converters

    Page(s): 850 - 856 vol.2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (548 KB) |  | HTML iconHTML  

    A family of compound active-clamping (CAC) DC-DC power converters is proposed. Both main switches and auxiliary switches in the converters can achieve zero-voltage-switching (ZVS), and their voltage stresses are low. There is no parasitic voltage ringing across the diodes of the converters. Operation principle and analysis of the CAC boost converter are explained. A CAC boost converter rated at 1 kW is built to verify the operation and the analysis View full abstract»

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  • Performance prediction of distributed power systems based on small-scale prototypes

    Page(s): 1161 - 1167 vol.2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (501 KB) |  | HTML iconHTML  

    A method to quantitatively predict performance of distributed power systems (DPS) is presented. A small-scale prototype system is proposed that can be used to predict the performance of the large full-scale DPS. Two experimental implementations of the design procedure are discussed, each with different accuracy and complexity. Experiments verify that the small-scale prototypes provide performance benchmarks for the full-scale DPS View full abstract»

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  • Multiphase voltage-mode hysteretic controlled VRM with DSP control and novel current sharing

    Page(s): 663 - 669 vol.2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (748 KB) |  | HTML iconHTML  

    Applying the voltage-mode hysteretic control to multiphase voltage regulator modules (VRMs) can satisfy many of the new and future generation of microprocessors and IC powering requirements. This is because of the numerous advantages that can be obtained when both techniques are used. However, several challenges arise that include current sharing, multiphase control signals distribution, high-speed comparators noise sensitivity, hysteretic band accuracy and stability, VRM operation startup, and the stability of the controller operation at large load transients. Addressing these challenges cannot be easily achieved using analog and discrete components but rather DSP can be used to solve these problems. In this paper, multiphase voltage-mode hysteretic controlled VRM with DSP control and novel current sharing is proposed View full abstract»

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  • An advanced low-cost sensorless induction motor drive

    Page(s): 802 - 808 vol.2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1955 KB) |  | HTML iconHTML  

    An advanced solution for the implementation of sensorless vector control of induction motors is presented in the paper. The proposed system is based on new variables of an induction motor model. The system works using vector coordinates in a stationary αβ frame of reference. A phase locked loop was used to control the angle between the flux vector and stator current vector. The model variables and rotor velocity are calculated from simple equations based on steady state relationships for active and reactive powers. A current controller for a current regulated PWM (CRPWM) inverter based on the simplified load model is presented. The proposed controller is based on back-EMF calculation. The developed sensorless system was investigated both in simulations and experiments. The overall system was implemented using a simple ADMC330 microcontroller View full abstract»

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  • LLC resonant converter for front end DC/DC conversion

    Page(s): 1108 - 1112 vol.2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (903 KB) |  | HTML iconHTML  

    A new LLC resonant converter is proposed for front end DC/DC conversion in a distributed power system. Three advantages are achieved with this resonant converter. First, ZVS turn on and low turn off current of MOSFETs are achieved. The switching loss is reduced so we can operate the converter at higher switching frequency. The second advantage is that with this topology, we can optimize the converter at high input voltage. Finally, with this topology, we can eliminate the secondary filter inductor, so the voltage stress on the secondary rectifier will be limited to two times the output voltage, better rectifier diodes can be used and secondary conduction loss can be reduced. The converter utilizes leakage and magnetizing inductance of a transformer. With magnetic integration concept, all the magnetic components can be built in one magnetic core. The operation and characteristic of this converter is introduced and efficiency comparison between this converter and a conventional PWM converter is given which shows a great improvement by using this topology View full abstract»

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  • A behavioral SPICE compatible model of an electrodeless fluorescent lamp

    Page(s): 948 - 954 vol.2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (750 KB) |  | HTML iconHTML  

    A behavioral, SPICE compatible, model was developed for an electrodeless fluorescent lamp (OSRAM SYLVANIA ICETRON/ENDURA 150W). The model emulates the static and dynamic behavior of the lamp when driven at high frequency. The model was tested under various experimental conditions: at steady state for different power levels, with an AM modulated drive, and under transient changes. Good agreement was found between the simulation runs and experimental results. However, the effect of temperature on the lamp's behavior may require a tighter fit of the model to the temperature dependence in cases where large changes in operating condition need to be simulated View full abstract»

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  • Digitally addressable DALI dimming ballast

    Page(s): 936 - 942 vol.2
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    A digitally addressable digital dimming ballast has been developed. It conforms to DALI standard requiring very few parts and operates at very low power. Applications include building management or studio lighting where it is desired to control single or groups of lamps for conserving energy, performing lamp maintenance or creating prefect light quality. The design includes the digital dimming ballast, the code of the microcontroller and a platform to control the ballast by PC View full abstract»

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  • A high efficiency HPF-ZCS-PWM Sepic for electronic ballast with multiple tubular fluorescent lamps

    Page(s): 924 - 930 vol.2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (687 KB) |  | HTML iconHTML  

    This paper presents a high efficiency Sepic rectifier for an electronic ballast application with multiple fluorescent lamps. The proposed Sepic rectifier is based on a zero-current-switching (ZCS) pulse-width-modulated (PWM) soft-commutation cell. The high power-factor of this structure is obtained using the instantaneous average-current control technique, in order to properly meet IEC61000-3-2 standards. The inverting stage of this new electronic ballast is a classical zero-voltage-switching (ZVS) half-bridge inverter. A proper design methodology is developed for this new electronic ballast, and a design example is presented for an application with five fluorescent lamps 40 W-T12 (200 W output power), 220 Vrms input voltage, 130 Vdc dc link voltage, with rectifier and inverter stages operating at 50 kHz. Experimental results are also presented. The THD at input current is equal to 6.41%, for an input voltage THD equal to 2.14%, and the measured overall efficiency is about 92.8%, at rated load View full abstract»

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  • High efficiency flyback converter using synchronous rectification

    Page(s): 867 - 871 vol.2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (736 KB) |  | HTML iconHTML  

    This paper presents a method of driving a synchronous rectifier in a flyback topology. For optimum driving of the synchronous rectifier in a flyback converter, the primary side gate signal has to be transferred to the secondary with minimum delay. This paper presents a method of signal transfer through a power transformer without interference with the main power train. In this concept, the main transformer of the flyback converter is used to store and transfer energy to the secondary and, at the same time, to transfer the gate signal from the primary side to the secondary side with minimum delay. Both the power winding and the signal transfer winding are incorporated in a multilayer PCB, reducing the labor cost. Incorporating the signal winding and the power winding on the same magnetic core decreases the cost and increases the power density, which is a very important feature for the latest generation of DC-DC power converters. This technology is implemented in a 15 W 3.3 V@ 4.5A DC-DC converter, with an efficiency reaching 90% at full load. The power density of the converter reaches 40 W/in3 View full abstract»

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  • High-frequency link inverter based on multiple-carrier PWM

    Page(s): 997 - 1003 vol.2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (300 KB) |  | HTML iconHTML  

    High-frequency AC link conversion offers a possible way to produce reduced-cost inverters for low-voltage DC sources such as fuel cells. The control complexity can be addressed by adapting pulse-width modulation (PWM) techniques. Here, a multi-carrier pulse-width modulation (PWM) approach is introduced as a convenient way to implement a high-frequency link inverter. The approach is a direct extension of conventional PWM, and supports square-wave cycloconversion methods that have appeared in prior literature. Simulation and experimental results are developed for a simple low-voltage AC link inverter View full abstract»

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  • Novel passive soft switching schemes for high power single phase PFC rectifiers

    Page(s): 957 - 961 vol.2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (381 KB) |  | HTML iconHTML  

    Two novel passive soft switching schemes are presented in this paper for the two-lower-switch boost type single-phase PFC rectifier. Neither additional active means nor any lossy components are employed in both schemes. Topology consideration, commutation analysis, mathematical descriptions are given along with simulated and experimental confirmation View full abstract»

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  • Series-parallel resonant forward inverter as a cold cathode fluorescent lamp (CCFL) driver

    Page(s): 943 - 947 vol.2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (397 KB) |  | HTML iconHTML  

    A square wave, produced by two switches that operate complementarily, is applied to a series-parallel resonant forward inverter, which is composed of leakage inductors, a magnetizing inductor, an external series capacitor and the parasitic parallel capacitor, and filtered into a sinusoid waveform to drive a cold cathode fluorescent lamp (CCFL). The complete operation principle and characteristics of this resonant circuit are discussed in detail in this paper. Complete hardware implementation with the UCC3975 controller and system efficiency are presented too View full abstract»

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  • Phase angle balance control for harmonic filtering of a three phase shunt active filter system

    Page(s): 1087 - 1093 vol.2
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    This paper proposes a new strategy for harmonic filtering of a three-phase shunt active filter system. The shunt harmonic filter's control objective is defined as: balance the phase angle of the input current with the phase angle of the line frequency component of the load current. This objective is achieved in discreet implementation without sensing the input voltages. The controller uses a phase shifting method on the sensed input current and then applies the resistor emulator type input current shaping strategy on the phase-shifted current. In implementation Texas Instrument's DSP based unit TMS320F240 EVM is used as the digital hardware platform. The control algorithm is computationally simple yet the harmonic filtering performance is high. The analysis, simulation and experimental results of a three-phase shunt active filter prototype on a 25A nonlinear load are presented View full abstract»

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  • A multiphase DC/DC converter with hysteretic voltage control and current sharing

    Page(s): 670 - 674 vol.2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (368 KB) |  | HTML iconHTML  

    An interleaving technique and hysteretic voltage control are suitable for low-voltage, high-current, fast-response power supplies. In this paper, a multiphase DC/DC power converter employing interleave and hysteretic control techniques and current sharing is proposed. The design considerations are discussed. Simulation and experimental results are reported View full abstract»

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  • Dynamic analysis of loss limited switching full bridge DC-DC converter with multimodal control

    Page(s): 617 - 623 vol.2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (526 KB) |  | HTML iconHTML  

    This paper presents a new variable frequency multimodal control strategy for loss-limited full bridge DC-DC power converters. This controller extends converter operating region and lowers magnetic component core loss. Steady state and dynamic analyses of the converter operation in the various modes are presented View full abstract»

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  • A novel control concept for operating a two-stage a-rectifier-based telecommunications power supply module under heavily unbalanced mains voltage conditions

    Page(s): 716 - 721 vol.2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (739 KB) |  | HTML iconHTML  

    In this paper, a novel control concept for a unity power factor three-phase AC/DC two-stage telecommunications power supply system is proposed. The system is formed by an input-side delta-connection of three single-phase modules with parallel connected DC outputs. The control concept features output voltage control, module load sharing and mains voltage proportional guidance of the input currents and does allow to continue in operation also in case of heavily unbalanced mains voltage condition like those given for a missing mains phase or in case of an earth-fault of a mains phase or for a short circuit between two mains phases View full abstract»

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  • Single magnetic push-pull forward converter featuring built-in input filter and coupled-inductor current doubler for 48 V VRM

    Page(s): 843 - 849 vol.2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (713 KB) |  | HTML iconHTML  

    This paper proposes an improved push-pull forward converter with a single EI or EE core for all the magnetic components including the input inductor, the stepdown transformer and the output inductors. This topology is essentially the modified push-pull converter with the built-in input filter and the coupled-inductor current doubler rectifier. The proposed integrated magnetics features minimized leakage inductance and an air gap in only the center leg; its winding and core losses are both lower than those of conventional integrated magnetic structures View full abstract»

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