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Power Electronics, IEEE Transactions on

Issue 1 • Date Jan 1999

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Displaying Results 1 - 24 of 24
  • A three-switch high-voltage converter

    Page(s): 177 - 183
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (376 KB)  

    A novel single active switch two-diodes high-voltage converter is presented. This converter can operate into a capacitor-diode voltage multiplier, which offers simpler structure and control, higher efficiency, reduced electromagnetic interference (EMI), and size and weight savings compared with traditional switched-mode regulated voltage multipliers. Two significant advantages are the continuous input current and easy isolation extension. The new converter is experimentally verified. Both the steady-state and dynamic theoretical models are correlated well with the experimental data View full abstract»

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  • An ultrasonic motor drive using a current-source parallel-resonant inverter with energy feedback

    Page(s): 31 - 42
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    An ultrasonic motor (USM) drive using a two-phase current-source parallel-resonant inverter is proposed in this study. A single-phase equivalent model of the USM is first described. Then, a detailed theory for the newly designed driving circuit for the USM, in which the inherent parasitic capacitances formed by the polarized piezoelectric ceramic of the USM are parts of the two parallel-resonant tanks, is introduced. Since the dynamic characteristics of the USM are greatly influenced by the variation in the quality factors of the parallel-resonant tanks, two transformers are added to feed the stored energy in the resonant tanks back to the DC source to reduce the quality factors. Detailed experimental results are provided to demonstrate the effectiveness of the proposed driving circuit View full abstract»

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  • Failure mechanisms of IGBTs under short-circuit and clamped inductive switching stress

    Page(s): 108 - 116
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (188 KB)  

    The application of insulated gate bipolar transistors (IGBTs) in high-power converters subjects them to high-transient electrical stress such as short-circuit switching and turn-off under clamped inductive load (CIL). Robustness of IGBTs under high-stress conditions is an important requirement. Due to package limitations and thermal parameters of the semiconductor, significant self-heating occurs under conditions of high-power dissipation, eventually leading to thermal breakdown of the device. The presence of a parasitic thyristor also affects the robustness of the device. In order to develop optimized IGBTs that can withstand high-circuit stress, it is important to first understand the mechanism of device failure under various stress conditions. In this paper, failure mechanisms during short-circuit and clamped inductive switching stress are investigated for latchup-free as well as latchup-prone punchthrough IGBTs. It is shown that short-circuit and clamped inductive switching cannot be considered equivalent in the evaluation of a device safe operating area (SOA). The location of thermal failure of latchup-free punchthrough IGBTs is shown to be different for the two switching stresses View full abstract»

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  • Induction motors' faults detection and localization using stator current advanced signal processing techniques

    Page(s): 14 - 22
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (328 KB)  

    The knowledge about fault mode behavior of an induction motor drive system is extremely important from the standpoint of improved system design, protection, and fault-tolerant control. This paper addresses the application of motor current spectral analysis for the detection and localization of abnormal electrical and mechanical conditions that indicate, or may lead to, a failure of induction motors. Intensive research effort has been for some time focused on the motor current signature analysis. This technique utilizes the results of spectral analysis of the stator current. Reliable interpretation of the spectra is difficult since distortions of the current waveform caused by the abnormalities in the induction motor are usually minute. This paper takes the initial step to investigate the efficiency of current monitoring for diagnostic purposes. The effects of stator current spectrum are described and the related frequencies determined. In the present investigation, the frequency signature of some asymmetrical motor faults are well identified using advanced signal processing techniques, such as high-resolution spectral analysis. This technique leads to a better interpretation of the motor current spectra. In fact, experimental results clearly illustrate that stator current high-resolution spectral analysis is very sensitive to induction motor faults modifying main spectral components, such as voltage unbalance and single-phasing effects View full abstract»

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  • Sensorless torque control of salient-pole synchronous motor at zero-speed operation

    Page(s): 202 - 208
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    A position and speed sensorless control using the counter electromotive force of a permanent-magnet motor (PM) debases the control performance at a low speed. We propose a controllable system at full speed, including a zero speed using saliency. At low speed, the sensorless control is made by observing a current ripple at a time when alternating voltage has been applied to a salient-pole motor. Also, for discriminating the S and N poles of the magnet, magnetic saturation is used. A device has been applied to the motor rotor to allow the magnetic saturation to come about easily. Furthermore, at a time of high speed, drive at a full-speed range has been accomplished by switching smoothly over to a sensorless driving system making use of counter electromotive force. All algorithms are implemented by software, and this system can operate successively from starting to high-speed operation. The paper discusses the operational principles at a low speed, analysis and experimental results, the control scheme, how to changeover the control mode at high speed, and the experimental results View full abstract»

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  • Simple analytical and graphical methods for carrier-based PWM-VSI drives

    Page(s): 49 - 61
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (484 KB)  

    This paper provides analytical and graphical methods for the study, performance evaluation and design of the modern carrier-based pulse width modulators (PWMs), which are widely employed in PWM voltage-source inverter (VSI) drives. Simple techniques for generating the modulation waves of the high-performance PWM methods are described. The two most important modulator characteristics-the current ripple and the switching losses-are analytically modeled. The graphical illustration of these often complex multivariable functions accelerate the learning process and help one understand the microscopic (per-carrier cycle) and macroscopic (per fundamental cycle) behavior of all the modern PWM methods. The analytical formulae and graphics are valuable educational tools. They also aid the design and implementation of the high-performance PWM methods View full abstract»

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  • A dual-bridge inverter approach to eliminating common-mode voltages and bearing and leakage currents

    Page(s): 43 - 48
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (148 KB)  

    This paper presents a dual-bridge inverter approach to eliminate the motor common-mode voltage and resulting bearing and leakage currents. The novel dual-bridge inverter is controlled to generate balanced excitation of the induction motor under pulsewidth modulation (PWM) inverter operation. Theoretical analysis, simulation results, and experimental results are presented to verify this concept View full abstract»

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  • A boost DC-AC converter: analysis, design, and experimentation

    Page(s): 134 - 141
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (276 KB)  

    This paper proposes a new voltage source inverter (VSI) referred to as a boost inverter or boost DC-AC converter. The main attribute of the new inverter topology is the fact that it generates an AC output voltage larger than the DC input one, depending on the instantaneous duty cycle. This property is not found in the classical VSI, which produces an AC output instantaneous voltage always lower than the DC input one. For the purpose of optimizing the boost inverter dynamics, while ensuring correct operation in any working condition, a sliding mode controller is proposed. The main advantage of the sliding mode control over the classical control schemes is its robustness for plant parameter variations, which leads to invariant dynamics and steady-state response in the ideal case. Operation, analysis, control strategy, and experimental results are included in this paper. The new inverter is intended to be used in uninterruptible power supply (UPS) and AC driver systems design whenever an AC voltage larger than the DC link voltage is needed, with no need of a second power conversion stage View full abstract»

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  • Predicting the transient effects of PWM voltage waveform on the stator windings of random wound induction motors

    Page(s): 23 - 30
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (136 KB)  

    In this paper, the effect of pulsewidth modulation (PWM) voltage waveform on the voltage distribution among the stator windings of random wound cage induction motors is studied. First, a method of estimating the high-frequency distributed-circuit parameters of the motor using finite-element analysis is described. From these parameters, an equivalent circuit is formed with the windings represented by partially distributed and partially lumped parameters. Using this equivalent circuit, the voltage distribution among the turns and coils of the motor are simulated using the SABER simulation package. Through simulation, the effect of rise time of the PWM wavefront on the voltage distribution is studied, and it is shown that the rise time of the wavefront has influence on the additional voltage stress on the line-end coil. In order to validate the simulation procedure adapted, the simulation results are compared with experimental results View full abstract»

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  • A new PWM controller with one-cycle response

    Page(s): 142 - 150
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (288 KB)  

    This paper proposes a new nonlinear control technique that has one-cycle response, does not need a resetable integrator in the control path, and has nearly constant switching frequency. It obtains one-cycle response by forcing the error between the switched variable and the control reference to zero each cycle, while the on and off pulses of the controller are adjusted each cycle to ensure near constant switching frequency. The small switching frequency variation due to changes in the reference signal and supply voltage and delays in the circuit are quantified. Using double-edge modulation, the switching frequency variation is further reduced, thus, the associated signal distortion is minimized. An experimental 0-20 kHz bandwidth 95 W RMS power audio amplifier using the control method demonstrates the applicability of this control technique for high-fidelity audio applications. The amplifier has a power supply ripple rejection (PSRR) of 63 dB at 120 Hz. Additionally, the total harmonic distortion plus noise (THD+N) is less than 0.07% measured with a power supply ripple of 15% View full abstract»

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  • Bandwidth considerations for multilevel converters

    Page(s): 74 - 81
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (220 KB)  

    Multilevel converters can achieve an overall effective switch frequency multiplication and consequent ripple reduction through the cancellation of the lowest order switch frequency terms. This paper investigates the harmonic content and the frequency response of these multimodulator converters. It is shown that the transfer function of uniformly sampled modulators is a bessel function associated with the inherent sampling process. Naturally sampled modulators have a flat transfer function, but multiple switchings per switch cycle will occur unless the input is slew-rate limited. Lower sideband harmonics of the effective carrier frequency and, in uniform converters, harmonics of the input signal also limit the useful bandwidth. Observations about the effect of the number of converters, their type (naturally or uniformly sampled), and the ratio of modulating frequency and switch frequency are made View full abstract»

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  • A 3-kW unity-power-factor rectifier based on a two-cell boost converter using a new parallel-connection technique

    Page(s): 209 - 217
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (284 KB)  

    This paper applies a recently introduced parallel connection technique to a unity power-factor preregulator based on a boost power converter incontinuous inductor-current mode. By means of a small extra inductance, two MOSFET pulsewidth modulation (PWM) cells are safely associated in parallel, which allows an increased output power being processed by two half-rated semiconductor devices. The new technique overcomes the existent alternatives, leading to a reliable switched power converter along with simplified layout requirements. This paper also presents a theoretical analysis accompanied by digital simulation cases. Results from a 3 kW prototype, based on the Unitrdae's UC3854 strategy, show that the present technique is very useful in revealing a natural balance among device currents. The laboratory circuit works at a 70 kHz switching frequency and also employs a soft-commutation network. This feature points to a high-efficiency converter and negligible device stresses, which have been verified in the laboratory View full abstract»

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  • New charge pump power-factor-correction electronic ballast with a wide range of line input voltage

    Page(s): 193 - 201
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (196 KB)  

    A new charge pump power-factor-correction (CPPFC) electronic ballast with a wide range of line input voltage is proposed in this paper. Circuit derivation and DC-bus voltage stress at start-up mode are discussed. The average lamp current control with switching frequency modulation is developed to achieve constant lamp power operation and low-crest factor. The proposed CPPFC electronic ballast is analyzed, implemented, and evaluated. It features continuous line input current, low total harmonic distortion (THD), constant lamp power operation, low-crest factor, and less switching current stress with low-DC-bus voltage stress for the line voltages from 180 to 265 V View full abstract»

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  • Parametric description of the effect of electron irradiation on recombination lifetime in silicon layers: an experimental approach

    Page(s): 117 - 123
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    The aim of this paper is to perform an experimental investigation on the effects of electron beam irradiation on the recombination lifetime of both p-type and n-type silicon layers in order to provide a set of parameters useful to model the recombination effects in semiconductor computer simulation package. To this goal, the authors propose to use a proper three-terminal test structure in order to extract these parameters directly from lifetime measurements along the silicon layers at different temperatures and at different injection levels by using the same silicon samples before and after the electron irradiation process in order to highlight the effects of the irradiation itself on the lifetime. The experimental results indicate that the electron irradiation is more effective for controlling the high-injection lifetime in p-type silicon than in an n-type one. The effect of the irradiation on lifetime can be basically taken into account by means of one energy level placed at 0.27 eV below the conduction band edge for both n-type and p-type material, with σ p≅10 σn View full abstract»

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  • High-efficiency low-stress electronic dimming ballast for multiple fluorescent lamps

    Page(s): 160 - 167
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (292 KB)  

    An electronic dimming ballast with a lead-lag tank operation (LLTO) having the properties of high efficiency and low stress is introduced in this paper. The ballast is configured with a voltage-fed half-bridge series-resonant parallel-loaded inverter (SRPLI) acting as a lamp driver. It is loaded with resonant tanks which are designed and operated to be capacitive and inductive to theoretically achieve both zero-voltage switching (ZVS) and zero current switching (ZCS) and to eliminate the reactive current circulating through the switches, resulting in low switching and conduction losses. Moreover, the merit of a successive lamp ignition can be attained with the proposed operation scheme so that current stress imposed on the switches can be reduced. With the plasma model of fluorescent lamps, the analysis, operating principle, and dimming control strategy of the electronic ballast are described in detail. On the other hand, the limitations of the proposed scheme are pointed out. Computer simulation results and experimental measurements are used to verify the theoretical prediction and analytical discussion View full abstract»

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  • Forward-flyback converter with current-doubler rectifier: analysis, design, and evaluation results

    Page(s): 184 - 192
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (308 KB)  

    Complete design-oriented steady-state analysis of the forward-flyback converter, with the current-doubler rectifier is provided. Advantages and disadvantages of this topology compared to the conventional forward converter are discussed. In particular, the transformer-secondary copper losses are evaluated. In addition, a step-by-step design procedure is given, Finally, experimental evaluation results obtained on a 3.3 V/50 A DC/DC converter prototype for the 40-60 V input-voltage range are presented View full abstract»

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  • Analysis and design methods for broadband power systems

    Page(s): 151 - 159
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (212 KB)  

    As more distributed approaches like those employed in broadband replace traditional methods of powering telecommunication networks, maintaining the present high levels of reliability and availability while minimizing cost requires that a thorough network analysis be conducted as an integral part of the design process. We present an analysis methodology for broadband power network design and illustrate it using examples. We also demonstrate how such analyses can be very useful, especially in the early planning and architecture determination stages, by providing comparisons between powering voltages with different waveforms View full abstract»

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  • Sliding mode input-output linearization and field orientation for real-time control of induction motors

    Page(s): 3 - 13
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (468 KB)  

    This paper deals with real-time control of an induction motor based on a digital signal processor (DSP) TMS320C31/40-MHz-based system. A sliding mode controller (SMC) is presented and compared with the well-known field orientation and input-output linearization techniques. To estimate the rotor flux, a sliding mode observer is used. Experimental results are given to highlight the performances and disadvantages of these methods with respect to rotor resistance variations View full abstract»

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  • Linear parameter estimation for induction machines considering the operating conditions

    Page(s): 62 - 73
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (428 KB)  

    The use of linear parameter estimation techniques to determine the stator resistance, self-inductance of the stator winding, transient inductance, rotor time constant, as well as the angular shaft speed of a three-phase induction machine is investigated in this paper. In order to obtain results with maximum accuracy, some specific procedures to reduce the effect of the operating conditions on the quality of the estimates are investigated. Both computer and experimental results are used to anchor the main conclusions issued from this study View full abstract»

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  • Multifrequency averaging of DC/DC converters

    Page(s): 124 - 133
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (388 KB)  

    This paper presents some of the issues involved in applying frequency-selective averaging to modeling the dynamic behavior of pulsewidth-modulated (PWM) DC-DC converters. We use the boost converter as an example to show the details involved in deriving some novel extended averaged models, and we use simulations to highlight the accuracy of the models even when traditional small-ripple conditions are not satisfied View full abstract»

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  • A new high-power-factor three-phase AC-DC converter: analysis, design, and experimentation

    Page(s): 90 - 97
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (216 KB)  

    This paper proposes a new high-power factor three-phase AC-DC power converter, which is composed of a line interphase transformer (LIT) and two three-phase diode rectifiers, followed by a pulsewidth modulation (PWM) DC-DC boost power converter. The active switch of the boost converter is gated at a constant frequency such that the AC input current is discontinuous. This procedure provides an input current shaping without the third, fifth and seventh harmonics. The currents that flow through the LIT and boost inductors have such a high-switching frequency that ferrite cores with a small size can be utilized. In addition, the output voltage is regulated by PWM to compensate for line voltage variations and load change. Theoretical analysis, design procedure and example, along with experimental results taken from a 6 kW laboratory prototype are given View full abstract»

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  • Coupled magnetic amplifiers in forward converter topologies

    Page(s): 168 - 176
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    A voltage and current analysis of magnetic amplifiers in switch mode power supply applications is presented, and results are compared with those predicted by the analysis. The application of coupled magnetic amplifiers to power supplies with coupled inductors in their auxiliary outputs is given. Favorable results are obtained when control of the magnetic amplifiers is taken from the aggregate auxiliary output voltages View full abstract»

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  • PWM series resonant DC-link converter with current clamping by the use of saturable core

    Page(s): 82 - 89
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    A series resonant DC link power converter with pulsewidth modulation (PWM) capability and current peak limiting is proposed. When desired, a resonant transition creates notches in the DC link current, allowing the switches of the power converter to synchronize with external PWM strategy. For that, it requires only an additional bidirectional switch. A saturable core (SC) achieves current peak limiting of which the clamping level is automatically adjusted by the current load. Analysis and design procedure are presented for the proposed topology, which does not use any dedicated devices for startup. Simulated and experimental results corroborate the theoretical studies View full abstract»

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  • A new analytical IGBT model with improved electrical characteristics

    Page(s): 98 - 107
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (352 KB)  

    A new analytical insulated gate bipolar transistor (IGBT) model for improved on-state characteristics prediction is proposed. Two-dimensional (2-D) effects in the forward conduction of an IGBT are studied analytically. These effects significantly in8uence the on-state characteristics of the device and must be accounted for when IGBT modeling. Dynamic characteristics and temperature effects are included in the model. Both three-dimensional (3-D) numerical simulation and experimental results support the theoretical analysis View full abstract»

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Aims & Scope

IEEE Transactions on Power Electronics covers fundamental technologies used in the control and conversion of electric power.

Full Aims & Scope