Power Electronics Specialists Conference, 1991. PESC '91 Record., 22nd Annual IEEE

24-27 June 1991

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  • PESC '91 Record. 22nd Annual IEEE Power Electronics Specialists Conference (Cat. No.91CH3008-0)

    Publication Year: 1991
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    Freely Available from IEEE
  • Series-type solid-state static VAR compensator

    Publication Year: 1991, Page(s):3 - 9
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (475 KB)

    A fast response, electronically controlled, continuously variable, equivalent capacitive reactance for series compensation of a utility transmission line is described. Unlike compensation by series dielectric capacitors, there is no fear of subsynchronous resonance (SSR) instability. A high level of compensation is possible because there is no danger of forced resonance by the supply frequency. Ex... View full abstract»

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  • An experimentally verified IGBT model implemented in the Saber circuit simulator

    Publication Year: 1991, Page(s):10 - 19
    Cited by:  Papers (47)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (941 KB)

    A physics-based insulated gate bipolar transistor (IGBT) model is implemented in the general-purpose circuit simulator Saber. The IGBT model includes all of the physical effects that have been shown to be important for describing IGBTs, and the model is valid for general external circuit conditions. The Saber IGBT model is evaluated for the range of static and dynamic conditions in which the devic... View full abstract»

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  • A new planar microtransformer for use in macro-switching-converters

    Publication Year: 1991, Page(s):20 - 26
    Cited by:  Papers (12)  |  Patents (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    A novel planar microtransformer for use in micro-switching converters of portable equipment is described. This microtransformer, consisting of planar coils and CoZrRe amorphous magnetic layers on a Si substrate, is fabricated by a dry process. It is approximately 0.3 mm thick and 4*4 mm/sup 2/. The coils have relatively high inductance of 50 nH/mm/sup 2/. This microtransformer is used in a primary... View full abstract»

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  • Capacitively coupled converter (C/sup 3/) for high power DC-DC conversion

    Publication Year: 1991, Page(s):27 - 30
    Cited by:  Papers (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (279 KB)

    The capacitive coupled converter for high-power voltage source DC-DC applications is described. Its steady-state and dynamic behavior are analyzed theoretically and by computer simulation. Factors affecting its operation and control are discussed and some design rules are presented. A proof-of-principle model of the capacitive coupled converter was constructed, and its waveforms were recorded.<... View full abstract»

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  • Soft switching AC/DC/AC converter with current freewheeling circuit

    Publication Year: 1991, Page(s):31 - 38
    Cited by:  Papers (4)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (431 KB)

    The modified DC-link (MDCL) converter generating sinusoidal output voltage solved the drawbacks of soft switching converters, such as high voltage stresses of devices and/or many device counts. However, it also has problems such as the high peak device current and a wide variation of switching cycle interval. An improved soft-switching AC/DC/AC converter based on a high-frequency link is proposed ... View full abstract»

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  • Drive of a high torque, low speed switched reluctance machine

    Publication Year: 1991, Page(s):39 - 42
    Cited by:  Papers (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (231 KB)

    A version of a motor belonging to the class of rolling rotor motors is described. An efficient power converter for controlling the freewheeling energy in its rotor coils, requiring only a low number of switches, is also presented. Tests on an experimental model are compared with theoretical calculations. Attention is drawn to the motor's robustness and simplicity, so that it can be considered for ... View full abstract»

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  • Analysis and comparison of real-time sine-wave generation for PWM circuits

    Publication Year: 1991, Page(s):43 - 48
    Cited by:  Papers (4)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    Four methods for the hardware and software generation of real-time sine-waves suitable for PWM circuits are presented. The sine-waves are derived from: a truncated modified cosine Taylor series, x( pi -x) function, a digitally filtered trapezoid, and a second-order differential equation. Triplen injection is incorporated by the addition of a defined magnitude triangular waveform of three times the... View full abstract»

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  • Parameter estimation algorithm for performance fine tuning of switching DC power supplies

    Publication Year: 1991, Page(s):51 - 56
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    A parameter estimation algorithm to aid power converter designers in fine-tuning the performance of switching DC power supplies is described. This algorithm identifies the optimal parameter values which satisfy the design specifications. The estimation algorithm is incorporated with a fast time-domain circuit simulator to form a user-friendly design environment. Numerical results are provided. The... View full abstract»

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  • Parameter and state estimation in power electronic circuits

    Publication Year: 1991, Page(s):57 - 61
    Cited by:  Papers (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (327 KB)

    Techniques for reconstructing or estimating unmeasured circuit variables and parameters in power electronic circuits are investigated. In numerous applications in power electronic systems, measurements of circuit variables (currents and voltages) are required for closed-loop control purposes or for diagnostic purposes, but are expensive or impossible to obtain directly. Examples are certain induct... View full abstract»

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  • Computer-aided identification of the small-signal model of power-electronics systems

    Publication Year: 1991, Page(s):62 - 66
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (230 KB)

    Since the exact model of switching circuits can be achieved by a recently described CAD tool, the possibility of automatic identification of the system small-signal model opens up. The connections of the circuits constituting a time-variant or time-invariant system have to be described by matricial relationships in the state space. The overall matrices relevant to the condition of all the feedback... View full abstract»

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  • Modelling of periodically switching networks

    Publication Year: 1991, Page(s):67 - 73
    Cited by:  Papers (36)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (449 KB)

    Two time-domain analysis methods for periodically switched systems, like converters, are presented. The first method analyzes the steady-state periodic behavior of the system, while the second describes the transient behavior. In contrast with state-space averaging, the methods do not use approximations, so exact results are obtained. The methods give more insight into the dynamical behavior of th... View full abstract»

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  • Small-signal analysis using harmonic balance methods

    Publication Year: 1991, Page(s):74 - 79
    Cited by:  Papers (25)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    A small-signal analysis method is described for piecewise-linear circuits that have periodic operating trajectories. The approach is general and accurate up through one-half the switching frequency. The method is oriented toward use in general computer simulation tools, and is demonstrated by comparisons with measurements from several circuits.<<ETX>> View full abstract»

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  • Application of the time varying transfer function for exact small-signal analysis

    Publication Year: 1991, Page(s):80 - 87
    Cited by:  Papers (15)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (526 KB)

    An analysis method for determining the control-to-output linearized describing function of time-interval-modulated switched networks using time-varying system theory was previously proposed by the author. A simplification which eases the analysis considerably is presented. Use of the simplified approach is demonstrated in the derivation of the control-to-output frequency response of pulsewidth-mod... View full abstract»

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  • Variable capacitor filter for smoothing rectifier output

    Publication Year: 1991, Page(s):91 - 95
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    A novel technique for smoothing rectifier output using variable characteristics filters is proposed. A major advantage of this technique is that it can eliminate a range of harmonics using a single switched-capacitor circuit. Principles of operation, methods of control, the analysis, and the design, supported by computer simulation and experimental work, are presented for a three-phase rectifier c... View full abstract»

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  • A general circuit topology of multilevel inverter

    Publication Year: 1991, Page(s):96 - 103
    Cited by:  Papers (193)  |  Patents (8)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (510 KB)

    A generalized circuit topology of multilevel voltage source inverters which is based on a direct extension of the three-level inverter to higher level is proposed. The circuit topologies up to five-level are presented. The proposed multilevel inverter can realize any multilevel pulsewidth modulation (PWM) scheme which leads to harmonic reduction and provides full utilization of semiconductor devic... View full abstract»

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  • Snubbers in PWM-VSI-inverter

    Publication Year: 1991, Page(s):104 - 111
    Cited by:  Papers (15)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (618 KB)

    Three snubbers intended for pulsewidth modulated (PWM)-VSI inverter applications are investigated. The snubbers have some common components and reduce space and cost. Useful, simple expressions for design of the three snubbers are given. The snubbers are simulated for one phase-leg using the circuit simulator PSPICE. Simple component models are used. The simulations are compared with measurements ... View full abstract»

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  • A three-phase current-fed active power filter by PWM injection method

    Publication Year: 1991, Page(s):112 - 116
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (313 KB)

    An improved pulsewidth modulated (PWM) control technique for three-phase active power filters is proposed which can control both the fundamental and the harmonic components in the AC current of the power electronic loads. A novel configuration of the current-fed filters to significantly reduce the filter capacity is described. Several theoretical characteristics of the current-fed filter are discu... View full abstract»

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  • Large capacity 3-phase UPS with IGBT PWM inverter

    Publication Year: 1991, Page(s):117 - 122
    Cited by:  Papers (8)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    A large-capacity pulsewidth modulated (PWM)-controlled uninterruptible power supply (UPS) with insulated gate bipolar transistors (IGBTs) in parallel in the inverter units is described. The proposed repetitive learning and current feedforward control system provides two to ten times better steady-state and transient characteristics than a conventional instantaneous control alone.<<ETX>>... View full abstract»

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  • A high performance current source inverter

    Publication Year: 1991, Page(s):123 - 130
    Cited by:  Papers (14)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (486 KB)

    A recent innovation in current source inverter (CSI) drives has been introduction of pulsewidth modulation (PWM) for the purpose of improving the quality of the load currents and voltages. However, the typical six-switch CSI circuit is not compatible with all standard PWM techniques, thus limiting the number of schemes that can be used. The modified CSI circuit discussed removes most of the restri... View full abstract»

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  • A power conditioner for 3-phase integral starter/alternator used in automobiles

    Publication Year: 1991, Page(s):131 - 135
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    A novel AC/DC drive for starting vehicles driven by internal-combustion engines, and for supplying energy to the ever-increasing electrical loads is described. The system consists of a three-phase squirrel-cage induction machine which operates in both motoring and generating modes, and a power conditioner capable of inverting, rectifying, and providing excitation to the machine, depending on wheth... View full abstract»

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  • A 1.6 kW, 110 kHz DC-DC converter optimized for IGBTs

    Publication Year: 1991, Page(s):139 - 147
    Cited by:  Papers (15)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (526 KB)

    A full-bridge DC-DC converter using zero-current and zero-voltage switching techniques is described. This circuit utilizes the characteristics of the IGBT to achieve power and frequency combinations that are much higher than previously reported for this device. Experimental results are included for a 1.6 kW, 110 kHz converter with 95% efficiency.<<ETX>> View full abstract»

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  • High power and high switching frequency DC-to-DC converter using saturable inductor commutation and switched snubber

    Publication Year: 1991, Page(s):148 - 154
    Cited by:  Papers (5)  |  Patents (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (475 KB)

    A novel method for high-power and high-frequency switching using the combined circuit of a switched snubber and a saturable inductor commutation is presented. Zero-voltage switching is realized and switching surges due to the parasitic inductance and the parasitic capacitance are decisively suppressed without increasing the conduction loss and switch stress. Using the technique of zero-voltage swi... View full abstract»

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  • Analysis and design of a saturable reactor assisted soft-switching full-bridge DC-DC converter

    Publication Year: 1991, Page(s):155 - 162
    Cited by:  Papers (11)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (370 KB)

    The analysis and design of a saturable reactor-assisted soft-switching full-bridge DC-DC converter are presented. The converter has advantages such as low switching losses (with no substantial increase in conduction losses), wide load range, and constant switching frequency. In order to show how to utilize the analysis results in designing, a 350 W 500 kHz converter is chosen as an example. The re... View full abstract»

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  • A novel self-oscillating synchronously-rectified DC-DC converter

    Publication Year: 1991, Page(s):163 - 170
    Cited by:  Papers (6)  |  Patents (5)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (429 KB)

    A self-oscillating synchronously rectified DC-DC converter (SOSYRC) is proposed and examined analytically and experimentally. The converter is composed of an autonomous high-frequency push-pull oscillator, a synchronous pulsewidth modulated (PWM) controller/driver, a synchronous rectifier, and an output filter. The synchronous controller is built around a conventional PWM controller. Its function ... View full abstract»

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