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
    Request permission for commercial reuse | PDF file iconPDF (525 KB)
    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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  • Regenerative power control for VVVF motor drive (critical braking method applied to the elevator)

    Publication Year: 1988, Page(s):97 - 105
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    A method for braking induction motors is described. The method, called critical braking, consumes the regenerative power within the rotor and stator windings of the induction motor itself. Critical braking is realized by maintaining the induction motor slip at a constant value at which the regenerative power and the consumed power in the windings balance. A practical control system is described th... 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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  • 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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  • Design of high-frequency hybrid power transformer

    Publication Year: 1988, Page(s):319 - 326
    Cited by:  Papers (33)  |  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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  • 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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  • Issues regarding the capacitance of 1-10 MHz transformers

    Publication Year: 1988, Page(s):352 - 359
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    Capacitive modeling issues are addressed, particularly with respect to minimizing leakage inductance. Reasonable assumptions about the winding configuration and the distribution of voltage around it are made. The total electrical energy stored in the winding when a voltage is applied is then calculated and partitioned into the differential and common-mode parts. A description of how the common-mod... 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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  • 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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  • Measurement techniques for the design of high-frequency SMPS transformers

    Publication Year: 1988, Page(s):341 - 351
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (768 KB)

    Measurement techniques to enhance the design process for SMPS (switched-mode power supply) magnetic components are described. Techniques for expanding and verifying the abbreviated core-loss data available from core manufacturers, and a method of evaluating conductive losses associated with the harmonic content of the current waveforms are presented. In-circuit, calorimetric verification of SMPS t... 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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  • Analysis and design of a novel 3-φ solid-state power factor compensator and harmonic suppressor system

    Publication Year: 1988, Page(s):267 - 277
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    A three-phase solid-state power-factor-compensation scheme is presented and analyzed. This scheme employs a PWM voltage-source inverter and has two important features: it can maintain a near-unity mains input power factor without sensing and computing the associated reactive power component, and it can substantially reduce any line current harmonics generated by nonlinear loads. The proposed schem... View full abstract»

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  • UPS systems: a review

    Publication Year: 1988, Page(s):151 - 154
    Cited by:  Papers (14)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    Available uninterruptible power supplies (UPS) are reviewed and some of the design criterion in their development is discussed. A 300 V DC output UPS is covered in detail. Its application to large systems such as mainframes is considered, and it is recommended that if connection problems can be overcome then UPS should be considered for PC power supply View full abstract»

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  • Aspects and considerations for power electronics and computer-aided simulation

    Publication Year: 1988, Page(s):59 - 63
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    Certain aspects of computer-aided simulation as applied to power electronics are considered. These include: needs and expectations; simulation program selection considerations; model libraries and modeling capabilities; computational considerations and convergence difficulties; behavioral models and desirable features and capabilities of simulators 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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  • 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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  • Magnetic snubber using amorphous saturable reactor-amorphous beads

    Publication Year: 1988, Page(s):334 - 340
    Cited by:  Papers (1)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    In switching regulators, a magnetic snubber connected to the output diode effectively suppresses spike voltage of the diode and output voltage noise. The principle theory is described and three types of magnetic snubbers are compared. The three types include snubbers incorporating ferrite beads, amorphous beads, and a high-rectangular reactor (spike killer). Newly developed amorphous beads are emp... 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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  • New insights affect power MOSFET ruggedness

    Publication Year: 1988, Page(s):290 - 298
    Cited by:  Papers (5)  |  Patents (1)
    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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  • Development of a multiple output resonant converter for space applications

    Publication Year: 1988, Page(s):167 - 181
    Cited by:  Papers (5)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (756 KB)

    The use of the series resonant converter, specifically the zero-current-switching type, for satellite component level power converter needs are explored. In an application such as this, each component is provided with conditioned power by a local DC/DC converter. These converters are required to operate from a low unregulated input bus such as 24 V to 38 V, to maintain primary and secondary isolat... 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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  • Feedback controller design for servo systems with dominant mechanical resonances

    Publication Year: 1988, Page(s):139 - 148
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (588 KB)

    An estimator-based linear discrete-time controller for a high-performance two-axis miniature wheelchair drive is presented. This drive has a dominant resonance at approximately half the Nyquist frequency of the controller. The controller actively damps this resonance while simultaneously achieving a higher closed-loop bandwidth than in conventional designs. The controller design methodology is bas... View full abstract»

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  • Duomode non-linear state space averaged SPICE model of a current mode buck converter

    Publication Year: 1988, Page(s):53 - 58
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    Although most current-programmed converters are designed for steady-state continuous mode operation, transient and fault analysis require dual-mode (continuous/discontinuous) models. The popularity of SPICE (Simulation Program with Integrated Circuits Emphasis) has created a demand for nonlinear state space averaged SPICE converter models because execution times of brute-force SPICE models are imp... View full abstract»

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