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Applied Power Electronics Conference and Exposition, 1991. APEC '91. Conference Proceedings, 1991., Sixth Annual

Date 10-15 March 1991

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Displaying Results 1 - 25 of 86
  • APEC '91. Sixth Annual Applied Power Electronics Conference and Exposition. Conference Proceedings (Cat. No.91CH2992-6)

    Publication Year: 1991
    Request permission for commercial reuse | PDF file iconPDF (32 KB)
    Freely Available from IEEE
  • High frequency high power DC-DC full bridge converter with zero-current zero-voltage commutation

    Publication Year: 1991, Page(s):71 - 77
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    The full bridge pulse-width-modulated (PWM) converter proposed has functions under nearly zero-current-zero-voltage switching conditions, thus minimizing switching losses. This is achieved by using a DC bus switch and a lossless DC bus snubber circuit, comprising an inductor and two capacitors. The DC bus switch can also be used to isolate the inverter under adverse system operation conditions. A ... View full abstract»

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  • Effects of resistances and leakage inductances on cross regulation in SRC

    Publication Year: 1991, Page(s):65 - 70
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    The authors analyze the effect of parasitic resistances on the cross regulation performance of multi-output series resonant converter (SRC) topologies. The steady state cross regulation characteristics are derived for the example of a two-output SRC. A comparison is given of the characteristic curves of the SRC with parasitic resistances and the SRC with leakage inductances. The results show that ... View full abstract»

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  • An automated reverse-bias second-breakdown transistor tester

    Publication Year: 1991, Page(s):339 - 346
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (564 KB)

    An automated instrument for generating curves for the reverse bias, safe operating area of transistors nondestructively is described. A technique for detecting second breakdown that makes automation possible is highlighted. Methods to reduce stress to the device under test are discussed, as are several other innovations that enhance automation. Measurements using the tester are described, and limi... View full abstract»

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  • Phase-shifted PWM control-a new integrated controller eases the design of efficient high-frequency bridge power switching

    Publication Year: 1991, Page(s):263 - 268
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    An integrated controller which is optimised for zero-voltage resonant switching of a square-wave bridge power topology is introduced. By modulating the power with phase control high efficiency can be achieved at high frequencies with the added benefit of constant frequency operation. Adaptable to both voltage and current mode control, this IC provides both regulating intelligence and fault protect... View full abstract»

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  • 150 W resonant converter with T-type tank circuit

    Publication Year: 1991, Page(s):58 - 64
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    The authors describe a half-bridge resonant converter with a T-type tank circuit, in which output voltage is insensitive to load variations, and only a very narrow range of switching frequency variation is required for output control. The output impedance reduction effect due to the T-type tank circuit was demonstrated through both simulation and experiment. A prototype resonant converter with a T... View full abstract»

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  • Magamp post regulators for symmetrical topologies with emphasis on half-bridge configuration

    Publication Year: 1991, Page(s):380 - 384
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    The major differences between symmetrical topology magamps and the forward power converter magamp are discussed. In a forward power converter, a small portion of the magnetizing current of the power transformer is diverted to the secondary for reset of the magamp's saturable reactor. In symmetrical topologies, the transformer's magnetizing current is not used for reset of the saturable reactor(s).... View full abstract»

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  • Unbalance supply and its effect on rectifier input filter kVA ratings

    Publication Year: 1991, Page(s):333 - 336
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (172 KB)

    A properly designed input filter traps one or more undesirable input current harmonic components. The effects of these various current harmonics on the filter kVA are evaluated for various operating conditions such as balanced and unbalanced supply voltage, constant DC load current, and with varying delay angles. An electrical circuit simulator software package is used to simulate the rectifier, a... View full abstract»

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  • Real-time median filtering with a fast hardware sorter

    Publication Year: 1991, Page(s):254 - 260
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    The authors describe a fast hardware implementation of a median filter with emphasis on possible applications to power electronics. The authors focus on the median filter as a relatively easily understood example which illustrates the potential of nonlinear filtering in power electronics. To show the power of the median filter, a review of offline results first presented by W. C. Karl et al. (1990... View full abstract»

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  • Constant frequency PWM capacitor voltage clamped series resonant power supply

    Publication Year: 1991, Page(s):52 - 57
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    The authors propose a capacitor voltage clamped series resonant converter, regulated at constant frequency by pulse-width modulation, (PWM-CVC-SRC), suitable for an offline isolated multiple output power supply. The principle of operation, theoretical analysis, the simulation, design procedure, and a design example are provided, along with experimental results. The validity of the theoretical anal... View full abstract»

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  • Evaluation and selection of forward rectifiers for mag amp secondary post regulators

    Publication Year: 1991, Page(s):373 - 379
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    The selection of forward rectifiers for a magnetic amplifier used in post secondary voltage regulation plays a key role in the effective control of the saturable reactor switches. The author examines four types of rectifiers which could be employed in a design and discusses the limiting factors for each type. The rectifiers evaluated are the ultra-fast, fast, Schottky, and power MOSFET synchronous... View full abstract»

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  • A unity power factor multiple isolated outputs switching mode power supply using a single switch

    Publication Year: 1991, Page(s):430 - 436
    Cited by:  Papers (49)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    The authors present an offline switching power supply with multiple isolated outputs and unity power factor with the use of only one power processing stage, based on the DC-DC SEPIC (single ended primary inductance converter) modulated by variable hysteresis current control. The principle of operation, the theoretical analysis, the design procedure, an example, and simulation results are presented... View full abstract»

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  • A passive input current waveshaping method for three-phase diode rectifiers

    Publication Year: 1991, Page(s):319 - 330
    Cited by:  Papers (11)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    A passive waveshaping method for a three-phase diode rectifier is presented. It is shown that application of the proposed passive method yields significantly higher input power factor, lower input current distortion factor, lower input RMS current, and a lower total volt-ampere (VA) rating of the reactive components than the conventional three-phase diode rectifier. Relevant input and output curre... View full abstract»

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  • High-voltage light-weight DC/DC converter

    Publication Year: 1991, Page(s):601 - 607
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    The authors present a DC/DC converter which operates at 100 kHz and uses the principle of the Cockraft Walton voltage multiplier circuit. The novel concept is in the multiplier circuit, where the diodes are replaced by MOSFETs and the sinusoidal input is replaced by a square wave voltage. This permits high-frequency operation and improves operation parameters. The circuit consists of two modules: ... View full abstract»

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  • Improved transient performance of a 3-phase controlled rectifier using predictive control

    Publication Year: 1991, Page(s):247 - 253
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    A simple ride-through control strategy, referred to as open loop predictive control, is presented. First, a model is proposed for the commonly used three-phase controlled rectifier, and the corresponding circuit equations are derived, such that the transient response can be accurately predicted for a given sequence of firing angles and for given initial conditions. Next, an algorithm is presented ... View full abstract»

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  • Economic single phase to three phase converter topologies for fixed frequency output

    Publication Year: 1991, Page(s):88 - 94
    Cited by:  Papers (11)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    Several component-minimized circuit topologies for single-phase to three-phase conversion are proposed. The proposed topologies employ fewer semiconductors devices and generate high-quality output voltages. A suitable modification to achieve an active input current shaping feature is illustrated in detail. Analysis and simulation of the proposed schemes are carried out to show the high-performance... View full abstract»

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  • A multi-simulator environment for power supply simulation

    Publication Year: 1991, Page(s):278 - 284
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    An integration of SPICE and a piecewise-linear systems simulator into a multisimulator environment for power supply design is presented. The seamless integration of these complementary simulators allows designers to easily select the simulator best suited to the problem at hand. The resulting design environment allows the designer to take advantage of the speed and ease of use of the piecewise-lin... View full abstract»

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  • Integrated-magnetic pre-converter networks for switchmode power converter circuits

    Publication Year: 1991, Page(s):133 - 139
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    The evolution details and design issues of novel pre converter approaches are presented, whereby the input voltage range capability of buck or buck-boost-derived DC-to-DC converters can be greatly extended. The integrated-magnetic forms of the concept use three passive circuit components and two diodes, and do not require any active switch elements. The preconverters also naturally translate the n... View full abstract»

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  • Design and analysis of the Ward converter for capacitor charging applications

    Publication Year: 1991, Page(s):45 - 51
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    A prototype capacitor charging power supply (CCPS) utilising the Ward converter circuit topology has been developed and evaluated by charging various values of energy storage capacitors and discharging them at various repetition rates. This converter topology is naturally protected against short circuit conditions. The primary side of the transformer appears as a current source to the energy stora... View full abstract»

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  • Electrical and thermal performance of PWB transformers

    Publication Year: 1991, Page(s):533 - 542
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (628 KB)

    The authors use analytical tools developed to predict the high-frequency characteristics of conventionally wound transformers and apply them to the planar printed wiring board (PWB) transformer case. The authors present a simple modeling technique that is useful in calculating the temperature rise for a PWB transformer assuming conduction through the base of the device as the only thermal path. Th... View full abstract»

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  • Microcontroller based arbitrary waveform inverter

    Publication Year: 1991, Page(s):499 - 505
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    A deadbeat controlled pulse-width-modulated (PWM) inverter was designed and implemented with a VLSI microcontroller (68HC11) operating at a 2×MHz clock frequency. The system is built around a full bridge switch configuration implemented by MOSFET transistors and associated opto-coupler drivers. The system operates at a PWM pulse rate of about 2 kHz (2 106/210≅1953 ... View full abstract»

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  • Quality and reliability: a customer's perspective

    Publication Year: 1991, Page(s):120 - 122
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    The authors discuss the customer's perspective in the manufacturing and design of power systems that must meet higher customer quality and reliability expectations while reducing production costs. The aspects related Storage Technology Corporation's activities are discussed View full abstract»

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  • Experimental study of the LLC-type series resonant converter

    Publication Year: 1991, Page(s):31 - 37
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    Previous studies of the LLC-type series resonant converter (LLC-SRC) have shown that this converter possesses much better control characteristics and lower component stresses compared with those of the conventional SRC. The authors extend previous work on the LLC-SRC by presenting a complete set of design curves and formulating a systematic design procedure for the converter. Based on the design p... View full abstract»

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  • Stabilizing magamp control loop by using an inner-loop compensation

    Publication Year: 1991, Page(s):365 - 372
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    By using the proposed inner-loop compensation scheme the resonance peaking of the open-loop transfer function of a magamp circuit for post regulator applications is eliminated. This makes the loop compensation of magamp control much easier. If properly used, the proposed scheme is capable of making the resultant loop gain essentially independent of parameter variation of the saturable reactors. A ... View full abstract»

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  • AC to DC power conversion with unity power factor and sinusoidal input current

    Publication Year: 1991, Page(s):400 - 406
    Cited by:  Papers (16)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    The authors present a one-stage single-phase controlled rectifier which has a wide output variation on the DC output maintaining unity power factor and sinusoidal current on the input side. The scheme consists of four bilateral switches, a high-frequency transformer, and a diode rectifier bridge with low-pass filters on both ends. This scheme also provides galvanic isolation, which is required in ... View full abstract»

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