Applied Power Electronics Conference and Exposition, 1988. APEC '88. Conference Proceedings 1988., Third Annual IEEE

1-5 Feb. 1988

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  • APEC '88: Third Annual IEEE Applied Power Electronics Conference and Exposition. Conference Proceedings 1988 (Cat. No.88CH2504-9)

    Publication Year: 1988
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    Freely Available from IEEE
  • Variable speed induction motor with integral ultrasonic PWM inverter

    Publication Year: 1988, Page(s):92 - 96
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    A variable-speed motor made by integrating an inverter into the end cowling of a modified induction motor is described. The inverter strategy is PWM, based on a 20 kHz asynchronous carrier and uses FREDFET (fast recovery epitaxial diode FET) power switches. Other characteristics are the addition of a third harmonic for greater output voltage and a novel technique for smooth reversing.<> View full abstract»

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  • Limitations of the magamp regulator and an improved magamp choke design procedure

    Publication Year: 1988, Page(s):109 - 117
    Cited by:  Papers (13)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (489 KB)

    Some inherent limitations of the magamp regulator are examined, and their effect on square-loop choke design is explained. One effect is that the commonly used area product design and method may not produce a core which will regulate properly. A core design procedure that includes these factors and utilizes the core volume as well as the area product for optimizing core size and core loss is devel... View full abstract»

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  • Design of high-frequency hybrid power transformer

    Publication Year: 1988, Page(s):319 - 326
    Cited by:  Papers (34)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    Fabrication of a high-frequency power transformer/inductor using multilayer thick-film hybrid technology is presented. An experimental 6 MHz, 40 W miniature transformer is fabricated with windings printed on the ferrite substrate. Half of a conventional low-profile pot core is used to close the magnetic path. Issues related to power density, thermal management, and efficiency of this hybrid power-... View full abstract»

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  • High field properties of nickel-zinc ferrites at 1-10 MHz

    Publication Year: 1988, Page(s):311 - 318
    Cited by:  Papers (23)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    The design of compact and efficient magnetic components for 1-10 MHz power conversion has been hindered by the lack of permeability and loss data for nickel-zinc ferrites. A technique for measuring permeability and loss density in magnetic materials at high-frequency and high-flux levels is described. Data is presented for eight commercially available nickel-zinc ferrites at 25°C, operating at... View full abstract»

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  • UC1860-new IC controls resonant mode power circuits

    Publication Year: 1988, Page(s):299 - 307
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    A novel integrated circuit, the UC1860, is introduced. Its prime purpose is to provide the control function in resonant mode power supplies operating at frequencies up to 3 MHz. A frequency-modulated, fixed on-time control scheme is implemented. Additional features include a programmable under-voltage lockout circuit and a programmable soft-start/hiccup circuit View full abstract»

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  • Integrated AC line monitoring in large computer power systems

    Publication Year: 1988, Page(s):377 - 382
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    A line motor card (LMC) which satisfies the need for a cost-effective high-performance monitoring device has been designed and integrated into the computer power supply system for large computers. A summary of the power-line-transient environment, and a description of the operation of the LMC are presented View full abstract»

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  • A new 200 A, 500 V cascade BIMOS power module for high power and high frequency inverter applications

    Publication Year: 1988, Page(s):226 - 235
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (604 KB)

    The development of a high-power cascade BIMOS module is reported. A cascade BIMOS is a Darlington configuration of a high-voltage MOSFET and a bipolar transistor of equal voltage rating, where the MOSFET constitutes the input stage and drives the output-stage bipolar transistor. The module is rated at 500 V, 200 A and is designed for high-power and high-frequency operation. The merits of the modul... View full abstract»

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  • PWM induction motor drive using the INMOS transputer parallel processor

    Publication Year: 1988, Page(s):121 - 129
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (468 KB)

    An initial experience of using the INMOS transputer in achieving a user-interactive open-loop controller for an induction motor drive is described. A single 32-bit transputer, the T414, was found to be adequate for the purpose of time/synchronization, host interaction and the real-time generation of pulse-width modulation (PWM) waveforms required for the drive's power electronics. A user-interacti... View full abstract»

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  • New insights affect power MOSFET ruggedness

    Publication Year: 1988, Page(s):290 - 298
    Cited by:  Papers (5)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    Issues affecting unclamped inductive switching (UIS) and diode recovery stress (DRS) failure modes of power MOSFET devices are discussed in terms of a modified device equivalent circuit. Test methods for both UIS and DRS are described; a useful format for device DRS capability is also described. The effect on switching efficiency of stored minority carrier charge in the MOSFET source-drain diode i... View full abstract»

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  • Magamp post regulators-practical design considerations to allow operation under extreme loading conditions

    Publication Year: 1988, Page(s):368 - 376
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    Practical design equations and guidelines to allow magamp operation under extreme loading conditions are established. Three conditions are considered: shutdown of output, foldback of the output current, and operation under discontinuous-inductor-current mode. Several numerical examples are used to illustrate design considerations and the use of the design equations View full abstract»

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  • Modeling of thyristor circuits in computer-aided analysis and design

    Publication Year: 1988, Page(s):219 - 225
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    A transistor-free model for a thyristor is presented. It contains only passive circuit components and current voltage sources. This model effectively simulates a thyristor for the study and design of power-electronics circuits using a SPICE program. Gate-triggering and controllable reverse-recovery time are possible using the proposed model. These aspects are important for high-frequency high-powe... View full abstract»

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  • Computer-aided electrical design of power processing systems

    Publication Year: 1988, Page(s):72 - 81
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    A computer-based approach to power supply design is presented and illustrated with a high-power forward converter example. The approach demonstrates a highly effective method of using computers to achieve design optimization while reducing design time and cost. A system-level simulation tool, based on generalized averaged models, is also presented and its use is illustrated with hardware measureme... View full abstract»

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  • A new family of resonant rectifier circuits for high frequency DC-DC converter applications

    Publication Year: 1988, Page(s):12 - 22
    Cited by:  Papers (59)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (732 KB)

    A family of rectifiers suitable for operation at high frequencies is presented. These rectifiers use naturally occurring component parasitics to control diode switching thereby minimizing parasitic ringing and improving rectification efficiency by reducing the flow of harmonic currents. The input impedance of the resonant rectifier is linear, which makes possible an accurate adjustment of the rect... View full abstract»

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  • SPICE models for power MOSFETs: an update

    Publication Year: 1988, Page(s):281 - 289
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    Five existing power MOSFET models intended for use with SPICE simulations are reviewed and compared. Methods used for simulating the gate-drain capacitance are evaluated. The internal JFET employed in two of the models is found to be usually unnecessary. A simple two-value capacitance model is recommended. The performance of this model is demonstrated with data obtained from 200 kHz forward conver... View full abstract»

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  • Coupled-inductor rectification and cycloconversion

    Publication Year: 1988, Page(s):258 - 266
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    AC-to-DC rectifiers and polyphase AC-to-DC cycloconverters are derived from the basic DC-to-DC converters by the addition of negatively coupled inductors with a minimal number of switching devices. The circuits also use space and time-multiplexed magnetics to handle the multiple inputs and outputs. The application of current-programming linearizes the duty ratio control, improves the output and in... View full abstract»

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  • Comparison of capacitive and inductive coupled parallel resonant converter

    Publication Year: 1988, Page(s):157 - 166
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    Capacitive-and inductive-coupled paralleled-resonant converters are analyzed by means of the state-plane technique. Based on the results of these analyses, a set of characteristic curves for the converters, operated in the continuous conduction mode, are presented. These curves can be used to facilitate both the analysis and the design of power converters. A general procedure for the construction ... View full abstract»

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  • Zero-voltage switching in a constant frequency digitally controller resonant DC-DC power converter

    Publication Year: 1988, Page(s):360 - 367
    Cited by:  Papers (13)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    A series-resonant DC-DC converter operating at a constant frequency above its resonant frequency is analyzed and experimentally tested. Using a state-plane analysis, the range of load for a given set of circuit parameters over which zero-voltage zero-current turn-on and zero-voltage turn-off (using lossless capacitive snubbers) are calculated and verified on a test circuit. A digital controller, d... View full abstract»

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  • 60 to 600 volt input DC to DC converter

    Publication Year: 1988, Page(s):212 - 216
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (148 KB)

    A DC to DC converter that converts an unregulated field excitation voltage to a regulated DC voltage (40 V, 1.8 A) with 10 kV isolation is described. The output of this DC to DC converter powers the rotor mounted electronics of a continuous-measurement monitor. The environment is 25-65°C and 50-300 Gs (steady state) resulting from centrifugal forces View full abstract»

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  • Power supply circuit development estimating aid: an expert system application

    Publication Year: 1988, Page(s):64 - 71
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (612 KB)

    A power supply circuit development estimating aid has been developed using an expert-system shell. The aid uses a detailed work-plan method to generate its estimate. Applications include training in the power-supply circuit development process, providing templates for a disciplined approach to power-supply circuit development, and producing a tool for exploring methods of reducing the cost of powe... View full abstract»

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  • A high resonant frequency multilayer ceramic capacitor for use in SMPS applications

    Publication Year: 1988, Page(s):327 - 334
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    Multilayer ceramic (MLC) capacitor designs which demonstrate high resonant frequency, exceptionally low effective series resistance, and high retention of effective capacitance up to resonance have been implemented and tested. These characteristics indicate that MLC capacitors can be used in small high switch frequency, modular power supplies. Properly designed and manufactured, MLC capacitors dem... View full abstract»

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  • IGT-gated bipolar MOS hybrid cascode switch

    Publication Year: 1988, Page(s):236 - 245
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    A three-terminal combinational switch which employs an insulated gate transistor (IGT) as a driver for a bipolar transistor in cascode with a low-voltage MOSFET is proposed. The desirable and limiting characteristics of IGT and IGT/bipolar cascode connection are reviewed. The operation details, advantages and device selection criteria of the proposed switch are discussed. The hybrid switch has imp... View full abstract»

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  • MODADEC: a VLSI circuit adapted to any kind of 2 levels PWM modulation

    Publication Year: 1988, Page(s):130 - 138
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    A new VLSI circuit which was developed to drive inverter-fed AC motors is described. It has been conceived as a peripheral of a microprocessor and offers a wide choice of PWM modes and strategies. The steady-state PWM waveforms are generated with high precision on the instant of commutation. The IC has high-frequency performances and can handle different optimizations of transients when changing P... View full abstract»

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  • A resonant DC-to-DC converter operating at 22 megahertz

    Publication Year: 1988, Page(s):3 - 11
    Cited by:  Papers (55)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    An experimental DC-to-DC converter prototype based on a zero-voltage switching, resonant circuit topology is described. The converter is suitable for mounting directly on a circuit card. The unit provides a regulated 5 V output at power levels up to 50 W with an input between 40 and 60 V. The switching frequency is between 20 and 24 MHz, depending on the input voltage and load. Differential input ... View full abstract»

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  • A SPICE model of a 2-phase permanent magnet step motor

    Publication Year: 1988, Page(s):85 - 91
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    A SPICE model of a two-phase, permanent magnet, step-motor is presented by the authors. It is capable of predicting, with reasonable accuracy, the electrical and electromechanical dynamics associated with a step-motor system. Central to the modeling process is the use of reference-frame theory to eliminate the time-varying inductances associated with the stator voltage equations, and the SPICE rea... View full abstract»

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