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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]

    Publication Year: 2002 , Page(s): i - xxxi
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    Freely Available from IEEE
  • Author index

    Publication Year: 2002 , Page(s): 1221 - 1224
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    Freely Available from IEEE
  • Phase angle balance control for harmonic filtering of a three phase shunt active filter system

    Publication Year: 2002 , Page(s): 1087 - 1093 vol.2
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1120 KB) |  | HTML iconHTML  

    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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  • 20V MOSFETs for DC-DC converters in desktop computers and servers

    Publication Year: 2002 , Page(s): 872 - 877 vol.2
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (616 KB) |  | HTML iconHTML  

    The challenge for distributed power supply engineers is to design a fast switching DC-DC power converter with improved transient response, while still maintaining or increasing efficiency. This has to be achieved in the tight thermal envelope required for reliable system operation and at minimal cost. This paper discusses the use of 20V MOSFETs for the economical design of high efficiency DC-DC power converters, replacing more expensive 30V MOSFETs in desktop computers and servers View full abstract»

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  • A new ZVCS resonant push-pull DC/DC converter topology

    Publication Year: 2002 , Page(s): 1097 - 1100 vol.2
    Cited by:  Papers (16)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (767 KB) |  | HTML iconHTML  

    A new ZVCS resonant DC/DC converter is presented in which the resonant circuit is located at the secondary side of the transformer and using the secondary leakage inductance as the resonant inductor. The proposed converter topology is suitable for unregulated low-voltage to high-voltage power conversion, as in battery-powered systems. The MOSFET primary switches and the output rectifiers turn-on and turn-off operate under zero-voltage and zero-current switching conditions. The measured efficiency is more than 94.5% from 20% loaded to full loaded View full abstract»

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  • Practical solutions to the design of current-driven synchronous rectifier with energy recovery from current sensing

    Publication Year: 2002 , Page(s): 878 - 884 vol.2
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (548 KB) |  | HTML iconHTML  

    A current-driven synchronous rectifier with current sensing energy recovery has been proved to be suitable for almost all high frequency switching topologies. The synchronous rectifier can be driven on and off automatically according to the current direction. In fact it can be taken as an active diode with very low power dissipation. Some theoretical analysis and experimental results have been shown in the previous work. This paper presents an extended analysis to some practical considerations when applying this current-driven synchronous rectifier in switching power converter design View full abstract»

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  • A ZVT PWM boost converter using an auxiliary resonant source

    Publication Year: 2002 , Page(s): 1101 - 1107 vol.2
    Cited by:  Papers (20)  |  Patents (1)
    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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  • Single magnetic push-pull forward converter featuring built-in input filter and coupled-inductor current doubler for 48 V VRM

    Publication Year: 2002 , Page(s): 843 - 849 vol.2
    Cited by:  Papers (17)
    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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  • LLC resonant converter for front end DC/DC conversion

    Publication Year: 2002 , Page(s): 1108 - 1112 vol.2
    Cited by:  Papers (220)  |  Patents (5)
    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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  • Piezoelectric-transformer inverter with maximum-efficiency tracking and dimming control

    Publication Year: 2002 , Page(s): 918 - 923 vol.2
    Cited by:  Papers (13)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (209 KB) |  | HTML iconHTML  

    This paper provides a solution for the problem of efficiency decrease caused by load variation and environmental temperature change. A novel control scheme of tracking the PT's operation frequency for the maximum efficiency is proposed. As a result, a high efficiency of over 80% has been achieved even under the output current decrease down to 10% of the maximum, and under the resonant-frequency variation by environmental temperature change of -10 to +70 centigrade View full abstract»

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  • Switching action delays in voltage regulator modules

    Publication Year: 2002 , Page(s): 675 - 678 vol.2
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (294 KB) |  | HTML iconHTML  

    Switching actions in voltage regulator modules (VRMs) cause delays in transient responses. The transient voltage variances due to the switching action delays cannot be neglected. This paper analyzes the relationship between the time instant of the load transient and the transient voltage spikes. The worst case is identified. The switching action delays in the "step up" and "step down" transients are different. The delay also depends on modulation methods. In trailing edge modulation, the delays in "step up" transients are more severe than those in "step down" transients. In leading edge modulation, the cases are opposite. In multi-channel interleaving VRMs, there are more worst-case points in a switching cycle. However, the delays at the worst cases are reduced. Analytic formulae are provided to describe the worst-case delays in different cases View full abstract»

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  • A study on DVR control for unbalanced voltage compensation

    Publication Year: 2002 , Page(s): 1068 - 1073 vol.2
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (377 KB) |  | HTML iconHTML  

    This paper presents a new control scheme for a DVR (dynamic voltage restorer) system consisting of series voltage source PWM converters. To control the negative sequence components of the source, it is necessary to detect the negative sequence components. Generally, a filtering process is used which has some undesirable effects. This paper suggests a new method for separating positive and negative sequences components. This control system is designed using differential controllers and digital filters. The positive and negative sequences are extracted and controlled individually. The performance of the presented controller and scheme are confirmed through simulation and actual experiment with a 2.5 kVA prototype DVR system View full abstract»

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  • An LCLC resonant DC-DC converter with PWM control-analysis, simulation, and implementation

    Publication Year: 2002 , Page(s): 1113 - 1119 vol.2
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1357 KB) |  | HTML iconHTML  

    A four-element (LCLC) resonant DC-DC power converter is presented. Equal ratios of resonant inductors and capacitors seem to provide overall optimum performance. The steady state characteristics using simple AC circuit analysis shows that the four-element resonant converter exhibits load-independent operation at two switching frequencies. The performance characteristics are obtained for a given set of design parameters. Closed-loop control of output voltage is explained with a block diagram. The converter is implemented close to a switching frequency of 100 kHz with the output voltage varied by pulse width modulation (PWM). The experimental results agree well with the Saber simulation results View full abstract»

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  • A comparative study of resonant inverter topologies used in induction cookers

    Publication Year: 2002 , Page(s): 1168 - 1174 vol.2
    Cited by:  Papers (33)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (616 KB) |  | HTML iconHTML  

    In this paper, a comparison is performed between four inverter topologies commonly used in induction cookers. The considered topologies are the full-bridge inverter, the half-bridge inverter, and two single-switch inverters. All of them are designed for the same specifications and they are compared in aspects such as power device stresses, efficiency, frequency control and electromagnetic emissions View full abstract»

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  • CWDC strategy for paralleled multi-inverter systems achieving a weighted output current distribution

    Publication Year: 2002 , Page(s): 1018 - 1023 vol.2
    Cited by:  Papers (11)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (306 KB) |  | HTML iconHTML  

    A current-weighting-distribution-control (CWDC) strategy for paralleled multi-inverter systems is presented in this paper. With a CWDC strategy, the inverters in the systems can have different power ratings and they can be connected in parallel to achieve a weighted output current distribution by only adding weighted distribution circuits to each inverter. In such systems, each inverter has an outer-loop voltage controller to govern system stability, an inner-loop current controller to improve the system response and a weighted current distribution controller to achieve a weighted output current distribution. Simulation results and hardware measurements from a two-inverter system, and simulation results from a three-inverter system have demonstrated the feasibility of the proposed strategy in weighted current distribution and fast regulation View full abstract»

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

    Publication Year: 2002 , Page(s): 850 - 856 vol.2
    Cited by:  Papers (8)  |  Patents (1)
    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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  • Novel passive soft switching schemes for high power single phase PFC rectifiers

    Publication Year: 2002 , 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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  • A novel control concept for operating a two-stage a-rectifier-based telecommunications power supply module under heavily unbalanced mains voltage conditions

    Publication Year: 2002 , 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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  • Indirect field orientation for induction motors without speed sensor

    Publication Year: 2002 , Page(s): 809 - 814 vol.2
    Cited by:  Papers (5)
    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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  • Ultra high efficiency of 95 percent for DC/DC converter - considering theoretical limitation of efficiency

    Publication Year: 2002 , Page(s): 735 - 741 vol.2
    Cited by:  Papers (13)  |  Patents (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (387 KB) |  | HTML iconHTML  

    The authors have considered the theoretical limitations in the efficiency of DC/DC power converters used in telecommunication applications. The theoretical limitation of efficiency in a single-stage topology and a two-stage topology is compared. As a result, they have selected a two-stage converter consisting of a buck+half bridge topology. This topology is suitable for high output current and low output voltage DC/DC converters. The prototype using a buck+half bridge topology has been made (3.3 V 60 A). The efficiency of the overall converter was 92% at full load, and an ultra high efficiency of 95% at half load was successfully achieved View full abstract»

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  • A novel ZVS DC/DC converter for high power applications

    Publication Year: 2002 , Page(s): 635 - 640 vol.2
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (299 KB) |  | HTML iconHTML  

    This paper presents a novel ZVS PWM DC/DC power converter for high power applications. By using two active switches on the secondary side of a transformer, the proposed converter achieves not only ZVS of the active switches in the entire load range, but also soft commutation of the output rectifier diodes. Simulation results and experimental results of a 2.8 kW 200 kHz DC/DC converter are presented View full abstract»

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  • Induction machines performance evaluator 'torque speed estimation and rotor fault diagnostic'

    Publication Year: 2002 , Page(s): 764 - 769 vol.2
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (452 KB) |  | HTML iconHTML  

    This paper proposes a new DSP based tool for evaluating the performance of induction motors based on the data extracted from the stator current. In the proposed algorithm, a pattern recognition technique according to Bayes minimum error classifier is developed to detect incipient rotor faults such as broken rotor bars and static eccentricity in induction motors. Also, part of the algorithm is based on the acceleration method presented in the IEEE Std. 112. It helps to calculate the motor's torque using two line currents and voltages. The use of linear and quadratic time-frequency representations is investigated as a viable solution to the task at hand. Speed information is vital in this approach, so an algorithm to track the speed related saliency induced harmonics from the machine's line current spectrogram is presented. Capturing the harmonics gives the rotor speed that can also be used to extract the feature vector for diagnostic. The implementation of the algorithm on TMS320C6000 family of DSP chips is currently underway. The complete algorithm is then be used to obtain the induction motor's performance curves. This is a complete stand-alone panel mounted induction motor diagnostic tool currently being developed in their lab. This package will be used in conjunction with a drive system (inverter) for online performance monitoring and preventing unwanted shutdown of the induction motor. The difficulties encountered, including a limited dynamic range and the presence of cross terms, are addressed and the suggested solution is provided. Experimental results corroborating the proposed algorithm are presented, and a discussion of the advantages and disadvantages of such an approach is touched upon View full abstract»

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  • A switched mode converter suitable for superconductive magnetic energy storage (SMES) systems

    Publication Year: 2002 , Page(s): 630 - 634 vol.2
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (337 KB) |  | HTML iconHTML  

    A power converter suitable for stiff current-type sources that provides regulated output voltage is presented and theoretically analyzed. Experimental results of a 200 W prototype show voltage regulation within 1% of output voltage and efficiency of up to 94% View full abstract»

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  • Coupled-inductor design optimization for fast-response low-voltage DC-DC converters

    Publication Year: 2002 , Page(s): 817 - 823 vol.2
    Cited by:  Papers (54)  |  Patents (15)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (510 KB) |  | HTML iconHTML  

    Multiphase voltage regulator modules (VRMs) for microprocessor power delivery with coupled output inductors are discussed. Strong coupling is shown to be feasible and effective at reducing ripple if the correct magnetic topology is used. For more than two phases, this can be a "ladder" core with windings around each rung. Typical ripple reduction is better than a factor of six with no effect on response time. One can also chose to improve response time while still significantly reducing ripple. A simultaneous numerical optimization of the magnetics and the circuit is used to minimize loss in a fast-response 100 A design View full abstract»

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  • Large-signal modelling of the PRC-LCC resonant topology with a capacitor as output filter

    Publication Year: 2002 , Page(s): 1120 - 1126 vol.2
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1174 KB) |  | HTML iconHTML  

    In this paper, two mathematical models are presented to approximate, accurately enough, the large signal dynamical behaviour and the steady state behaviour of the PRC-LCC resonant topology with a capacitor as output filter. The method used to obtain these models is based on applying the extended describing function and the generalised averaging modelling techniques. Therefore, the evolution of the topology waveforms, most of them sinusoidal, is approximated by their corresponding envelope. These envelopes are expressed by a set of nonlinear differential equations which are solved numerically with the help of a computer. The resulting algorithm is faster than a straight PSpice simulation and free of convergence problems. Finally, the good concordance between the models and the practice is verified with a wide set of experimental results View full abstract»

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