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

10-15 March 1991

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  • APEC '91. Sixth Annual Applied Power Electronics Conference and Exposition. Conference Proceedings (Cat. No.91CH2992-6)

    Publication Year: 1991
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    Freely Available from IEEE
  • 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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  • Analysis and design of a modified series resonant converter

    Publication Year: 1991, Page(s):594 - 600
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    A modified series resonant convertor (SRC) which overcomes the problems of a standard SRC is presented. A state-space approach is used for the analysis. The analysis shows that the converter enters into three different modes. Converter gain and other component stresses are plotted with variation in the load current. Detailed experimental results obtained from a 500 W, MOSFET converter are presente... View full abstract»

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  • Constant frequency controlled full-bridge LCC-type parallel resonant converter

    Publication Year: 1991, Page(s):587 - 593
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    A constant-frequency controlled full-bridge LCC-type parallel resonant converter is presented. By using a proper transformation on the state variables, the converter is analyzed by means of a two-dimensional state-plane diagram, which shows that the converter possesses three operation modes. Control characteristics and component stress curves are derived for only operation mode II. It is shown tha... View full abstract»

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  • Japanese electronics manufacturing-an overview

    Publication Year: 1991, Page(s):630 - 634
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (168 KB)

    The author shares information gathered from a two-week study mission in Japan reviewing manufacturing practices and the management culture. The mission comprised sixteen executives from nine different companies. The mission focused on Deming award winning companies in Japan and their approach to TQC (total quality control), in all facets of the business View full abstract»

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  • An efficient full bridge PWM DC-DC converter topology using lossless snubber and simple active energy recovery network

    Publication Year: 1991, Page(s):146 - 157
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    The single-phase full-bridge mode pulse-width modulated (PWM) DC-DC converter topology discussed minimizes switching losses and resulting stresses through the effective use of one DC bus inductor and two snubber capacitors. The inductor provides zero current turn-on and the capacitors are alternately connected across each switch, thus providing zero voltage turn-off. After turn-off, capacitor ener... View full abstract»

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  • The battery market

    Publication Year: 1991, Page(s):230 - 235
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    The international battery market in general, and the US market in particular, are discussed. The worldwide battery market is estimated to be $21 billion annually. The geographical distribution of this market is shown. Automotive and consumer batteries constitute more than 80% of the world battery market. The United States is the biggest single market among the countries of the world with a market ... View full abstract»

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  • Current-mode control: a unified model for open-loop instability

    Publication Year: 1991, Page(s):459 - 465
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    A model describing the open-loop instability of constant-frequency current-mode-controlled switching power cells operating in a heavy mode is presented. The instability is a common feature of many different cells, and is independent of their topology. The oscillations occur at one-half of the switching frequency and can be suppressed applying compensating waveforms. These unifying features are at ... View full abstract»

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  • Steady state analysis of DC to DC resonant converter

    Publication Year: 1991, Page(s):580 - 586
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    The authors describe the steady-state analysis of DC-to-DC resonant converters in the time domain as well as in the frequency domain. Closed-form expressions are derived in the time domain using a general method of determining the steady-state response of a linear time-invariant system with a periodic input. A comparative study is performed of the results obtained by the frequency domain and time ... View full abstract»

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  • Inverter topologies and control techniques for sinusoidal output power supplies

    Publication Year: 1991, Page(s):81 - 87
    Cited by:  Papers (24)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    The author reviews the state of the art in terms of power converter topologies and control techniques for realizing sinusoidal output systems. In terms of control strategy, the use of a variety of pulsewidth modulation (PWM) techniques have been proposed for realizing small filter size and good spectral performance. Some of the more popular techniques prevalent in industry are of potential importa... 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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  • Quality and reliability: a customer's perspective

    Publication Year: 1991, Page(s):120 - 122
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    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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  • Control of three phase power supplies for ultra low THD

    Publication Year: 1991, Page(s):622 - 629
    Cited by:  Papers (29)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (524 KB)

    Current regulators are proposed and investigated for high-power three-phase power supplies with ultra-low total harmonic distortion (THD) (less than 0.5%). Two valid approaches to realize three-phase power supplies can be proposed. In the first approach, current regulated pulse-width-modulated (PWM) inverters along with high bandwidth voltage control loops are proposed. In the second approach, an ... View full abstract»

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  • Comparing battery back up units

    Publication Year: 1991, Page(s):480 - 483
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    Current technology for uninterruptable power systems (UPSs) is discussed, and some guidelines for determining the cost-effectiveness of integrating battery backup with the power supply are presented. As the percentage of systems with backup increases, it becomes cost-effective to integrate the battery backup with the power supply. A custom design may be required for maximum cost benefit. The choic... View full abstract»

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  • A half-bridge zero-voltage switching pulse-width modulated DC-to-DC converter

    Publication Year: 1991, Page(s):140 - 145
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    The authors introduce a half-bridge DC-to-DC converter, regulated by pulsewidth modulation (PWM) at constant switching frequency and featuring commutation at zero-voltage. The principle of operation, the theoretical analysis, the design procedure and an example, and experimental results are provided. It is demonstrated that the proposed converter does not use resonance to transfer power to the loa... View full abstract»

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  • The market for distributed power systems

    Publication Year: 1991, Page(s):225 - 229
    Cited by:  Papers (7)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    Distributed power architectures replace central power sources with one bulk power supply that is converted to the required voltages by DC/DC power converters at the point of need. The benefits and disadvantages of distributed power systems are summarized. In the last ten years, the design advantages of distributed power systems has spread to a variety of applications, including industrial controls... View full abstract»

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  • Improvement of stability in current-programmed SEPIC DC/DC converters

    Publication Year: 1991, Page(s):452 - 458
    Cited by:  Papers (12)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    Techniques to enhance the stability of current-programmed single-ended primary inductance converters (SEPICs) are described, ranging from component selection to sensing a filtered copy of the control current. A summary is presented of a method for analyzing stability by direct calculation of the eigenvalues of an averaged time-evolution operator. The key to the method is the expression of duty rat... 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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  • A lossless commutation pulse width modulated converter by using a resonant disconnecting circuit

    Publication Year: 1991, Page(s):573 - 579
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (204 KB)

    The authors describe a lossless commutation buck pulse-width-modulated converter that uses a resonant disconnecting circuit (buck-LC-PWM-RDC). The operation principle, design-oriented analysis, numerical simulation, and experimental results are presented. The topology presents a novel working mode. This is obtained by using a resonant commutation cell composed of three switches, two capacitors, an... View full abstract»

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  • High frequency high power DC-DC full bridge converter with zero-current zero-voltage commutation

    Publication Year: 1991, Page(s):71 - 77
    Cited by:  Papers (1)
    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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  • 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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  • Using a boundary layer technique to reduce chatter in sliding mode controllers

    Publication Year: 1991, Page(s):195 - 201
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (468 KB)

    A changing boundary layer width is used to adjust for the tradeoff between robustness and chatter elimination. Speed control of a DC motor is used as an example to demonstrate the effectiveness of the proposed approach. The boundary layer width is adjusted from a very large value (to eliminate chatter in the transient period) to a small value (to improve robustness as the system approaches steady ... View full abstract»

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  • ESD damage: what it is and what we can do about it

    Publication Year: 1991, Page(s):117 - 119
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    The author discusses electrostatic discharge (ESD) damage that is inflicted upon electronic components and assemblies. During manufacture or transit, various materials and compounds rub against each other or separate one from another. This creation of a net charge imbalance on two or more objects by rubbing and separating is called triboelectric charging, and is a primary source for concern in ESD... View full abstract»

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  • Characteristics of load resonant converters operated in a high power factor mode

    Publication Year: 1991, Page(s):5 - 16
    Cited by:  Papers (63)  |  Patents (31)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (700 KB)

    The performance of the parallel resonant converter and the combination series/parallel resonant converter (LCC converter) when operated above resonance in a high power factor mode are determined and compared for single-phase applications. When the DC voltage applied to the input of these converters is obtained from a single-phase rectifier with a small DC link capacitor, a relatively high power fa... View full abstract»

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  • Applying power electronics to residential HVAC-the issues

    Publication Year: 1991, Page(s):615 - 621
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (572 KB)

    The author outlines several of the market and application issues bearing on the economics of residential variable speed air conditioners and heat pumps. Variable capacity systems develop only enough capacity to exactly match the heat gain or loss in the conditioned space. The intention is to provoke new creative technical solutions and to invoke new marketing strategies that will develop the poten... View full abstract»

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