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Proceedings, Fourth Annual IEEE Applied Power Electronics Conference and Exposition

13-17 March 1989

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  • APEC 89. Fourth Annual IEEE Applied Power and Electronics Conference and Exposition. Conference Proceedings 1989 (Cat. No.89CH2719-3)

    Publication Year: 1989
    Request permission for commercial reuse | PDF file iconPDF (31 KB)
    Freely Available from IEEE
  • Use of current injected control in solenoid focusing coil power supplies

    Publication Year: 1989, Page(s):125 - 135
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (596 KB)

    The use of current-injected control in the design of solenoid power supplies is discussed. Such a supply is required to provide a constant current to a large inductive load. The control to output (power stage) transfer characteristics are worked out for a generalized load. The location of the poles and zeros and the effect of load inductance on the inner current loop are investigated. This control... View full abstract»

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  • Chaos: a real phenomenon in power electronics

    Publication Year: 1989, Page(s):115 - 124
    Cited by:  Papers (41)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (580 KB)

    An introductory tutorial on chaotic behavior in DC-DC convertors is presented. Chaos is characterized by an emipirical spectrum which has a continuous component, and may even have no discrete components. Chaotic behavior frequently occurs when a power converter operates in a protective mode such as in a short-circuit or overload condition. Chaotic behavior in power converters is described in terms... View full abstract»

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  • Device level simulation for power converters

    Publication Year: 1989, Page(s):335 - 343
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    The objective of device-level simulation of power converters is to obtain detailed performance information such as device voltage and current waveforms and power dissipations. The resulting model can also be used in the course of design to help optimize component choices. Issues involved in device-level simulation such as applications, problems, limitations and advantages are discussed. An example... View full abstract»

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  • Rectifier design for minimum line current harmonics and maximum power factor

    Publication Year: 1989, Page(s):13 - 22
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (848 KB)

    A current quantitative computer simulation-based analysis is presented for single- and three-phase rectifier line current harmonics and power factors as a function of the output filter inductor. A finite-output filter inductor is shown to produce minimum single-phase rectifier line-current harmonics and, if used with an input displacement power factor correction capacitor, to produce maximum overa... View full abstract»

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  • A novel magnetic-attraction positioning actuator

    Publication Year: 1989, Page(s):109 - 111
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    A positioning actuator based on the principles of magnetic attraction and elastic repulsion is presented. The principle of operation of the actuator is simple and resembles that of a caterpillar. Three electromagnets are arranged in line and placed on a ferromagnetic surface. When energized, the two outer electromagnets, E1 and E2, adhere to the surface, anchoring the assembly. The central electro... View full abstract»

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  • Integrated current regulation for a brushless ECM drive

    Publication Year: 1989, Page(s):81 - 90
    Cited by:  Papers (5)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    A method is described for regulating phase currents in a brushless electronically commutated motor (ECM) without the use of any discrete current sensors such as shunts or current transformers. Current feedback information is provided by current sensors integrated into MOS-gated power switches (i.e. MOSFETs and IGFETs), and the current regulation is performed by smart-power gate drive integrated ci... View full abstract»

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  • Characterizing high-frequency effects in transformer windings-a guide to several significant articles

    Publication Year: 1989, Page(s):373 - 385
    Cited by:  Papers (74)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1056 KB)

    Several papers pertaining to the design and modeling of high-frequency transformer windings are reviewed. Each paper is summarized, stressing its significant contributions and its relationship to the others. The emphases and relative merits of each are discussed, and the understandability and applicability are evaluated View full abstract»

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  • Using CAE/CAT tools to evaluate power supply parasitics

    Publication Year: 1989, Page(s):56 - 63
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    Computer-based techniques are developed for determining the values of the parasitic components which influence the transfer function of most power processing circuits. The techniques are straightforward and numerical examples are given. While a magamp post-regulator is used as an example, the general function is similar for most types of power converters, and the techniques developed for determini... View full abstract»

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  • Performance of low loss synchronous rectifiers in a series-parallel resonant DC-DC converter

    Publication Year: 1989, Page(s):240 - 246
    Cited by:  Papers (26)  |  Patents (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    The functionality of efficient synchronous rectifier components, specially developed for resonant DC-DC converter topologies designed to operate at high frequency, has been demonstrated in a series-parallel converter circuit operating at 420 kHz and 85 W. Conduction losses for these components are three times lower than for Schottky diodes. Switching conditions for efficient operation have been id... View full abstract»

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  • Evaluating power supply designs with CAE models

    Publication Year: 1989, Page(s):323 - 334
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (744 KB)

    Advanced simulation tools and analog computer-aided engineering (CAE) modeling are considered. Techniques for evaluating CAE models are presented and the advantages of using CAE models over breadboard models are explained. To demonstrate the power and advantages of the modeling approach a 1 kW, half-bridge, off-line converter is described. The design of the secondary, the input filter, and the tra... View full abstract»

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  • Combining new, high-power packages with high-power ICs answers need for hermetic, military motor control electronics

    Publication Year: 1989, Page(s):188 - 194
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (508 KB)

    Two high-power hermetic packages have been tooled that offer the combination of increased lead-count and thermal ratings needed to provide military-grade power ICs. This work concerns the two package styles, and the initial high-power motor ICs that utilize them. The first is a 15-lead TO-204 style (formerly called the TO-3), that uses conventional materials, form factor, and manufacturing techniq... View full abstract»

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  • The effect of duty cycle on SMPS common mode emissions: theory and experiment

    Publication Year: 1989, Page(s):3 - 12
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    The theoretical time- and frequency-domain waveforms of common-mode conducted emissions for an arbitrary SMPS duty cycle is derived. It is shown that the magnitude of common-mode emissions is independent of collector voltage rise time. Experimental data is presented for model validation. Common mode emissions are shown to be independent of switching transistor rise time. The model predicts the var... View full abstract»

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  • Simulation of thermal effects in electrical systems

    Publication Year: 1989, Page(s):353 - 356
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (228 KB)

    Simulators based on the SPI CE program have one major limitation in that every device in a system must operate at the same temperature. A discussion is presented of modifications implemented in SPICE such that each device's operating temperature can be set independently by operating-point power dissipation and/or user input, and can vary during a transient analysis controlled by a user-defined par... View full abstract»

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  • Applied power board testing

    Publication Year: 1989, Page(s):34 - 39
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    A description is given of some approaches implemented in both hardware and software to reduce production test and test development costs for power supply circuits. Opportunities for cost savings during production power board testing are emphasized. Analog testability issues are discussed with a power board emphasis. Various fixturing methods are presented along with their advantages and disadvanta... View full abstract»

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  • Harmonic reduction in single-phase inverter using a parallel operation technique

    Publication Year: 1989, Page(s):101 - 108
    Cited by:  Papers (13)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    A technique is presented for harmonic reduction in inverters using sinusoidal pulse-width modulation (PWM). A modified circuit based on parallel operation of MOS-based inverter sets using interphase reactors as harmonic reducing elements and making use of a specific phase shift between the modulating and carrier waveforms is investigated as a means to economically and efficiently reduce the harmon... View full abstract»

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  • Driving three-phase brushless DC motors-a new low loss linear solution

    Publication Year: 1989, Page(s):75 - 80
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    A linear driver for small brushless DC motors has been developed that has the capability of maximizing the voltage delivered to the motor while providing commutation logic and full control. by using discrete p-n-p high-side transistor switches in conjunction with integrated saturable n-p-n low-side drivers, a total loss of under 1 V can be achieved at currents up to 2 A and complete motor control ... View full abstract»

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  • MLC capacitors for switch mode power supply and related large signal applications

    Publication Year: 1989, Page(s):365 - 372
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    The construction and characteristics of a multilayer ceramic (MLC) capacitor are reported. Results are presented from studies of MLC capacitors used in several power supply (large-signal) applications. These are described along with measurement techniques suited to large-signal devices. A variety of device ratings have been attained for both X7R and COG dielectrics. Capacitance values up to severa... View full abstract»

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  • A two-stage two-phase double-forward converter for pulsed-load applications

    Publication Year: 1989, Page(s):46 - 55
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    Design of the two-stage two-phase double-forward converter for pulsed-load radar applications is presented. This topology provides an optimum combination of fast output-current buildup time and low RMS current in the switching transistors. An equivalent small-signal circuit of this multiphase converter based on the single-stage model is developed. Results of the converter simulation under dynamic ... View full abstract»

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  • A resonant converter suitable for 650 V DC bus operation

    Publication Year: 1989, Page(s):231 - 239
    Cited by:  Papers (13)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    A high-frequency resonant converter configuration suitable for operation on a 650 V (nominal value) DC bus is described. Selection of the high-frequency switch and an appropriate resonant converter configuration are discussed. A series-parallel resonant converter using insulated-gate bipolar transistor-gated bipolar/MOSFET (BiMOS) cascode switches and operating above resonance is chosen for the ap... View full abstract»

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  • High density surface mounting power supply

    Publication Year: 1989, Page(s):265 - 271
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    The various stages in the design of a high-density surface-mounted power supply are described, including the development of the passive power components, power chip carrier package, and interconnection substrate. Emphasis is on the design and minimization of the power ceramic capacitor, quadrupole capacitor, and transformer components. The construction of a 16-60 V/5 V 20 A DC-DC converter using t... View full abstract»

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  • Off-line application of the fixed frequency clamped mode series-resonant converter

    Publication Year: 1989, Page(s):213 - 220
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (452 KB)

    The performance of the clamped-mode series-resonant converter is studied for various applications. Prototypes designed for operation below and above resonant frequency and zero-current turn-off or zero-voltage turn-on switching conditions are described. Theoretical characteristics were used for the circuit's design in each operating mode; the corresponding region of operation is defined and verifi... View full abstract»

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  • Computer-based design of optimal efficiency series-resonant converters above resonance

    Publication Year: 1989, Page(s):315 - 322
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB)

    Power losses in series-resonant converters (SRCs) operated above resonance are examined to develop design guidelines for producing SRCs with high operating efficiencies. Expressions are developed as functions of the design variables for losses in the transistor switches, antiparallel diodes, and the resonant capacitor. Using these independent design variables as arguments, performance functions (s... View full abstract»

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  • Novel high force-density PM linear oscillating motors and their controllers

    Publication Year: 1989, Page(s):183 - 187
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    A DC permanent-magnet (PM) linear oscillating motor/controller system is discussed. The device described uses a novel manufacturing technique that results in a high force-density device. The mechanism of static force production and the effects of airgap leakage flux on the force are treated theoretically. Emphasis is on the exact determination of electromagnetic fields and forces for the resulting... View full abstract»

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  • A new linear regulator features switch mode overcurrent protection [for power supplies]

    Publication Year: 1989, Page(s):159 - 164
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    A linear regulator control circuit for power supply applications is presented which, in addition to offering benefits such as low input-output differential and a precise reference voltage, features a unique and innovative approach to overload protection. By using duty-ratio, switch-mode protection, this circuit eliminates both the high internal dissipation of constant current limiting and the latc... View full abstract»

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