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Power Electronics, IEEE Transactions on

Issue 1 • Date Jan. 1986

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Displaying Results 1 - 14 of 14
  • [Front cover]

    Page(s): c1
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  • IEEE Transactions on Power Electronics

    Page(s): nil1
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  • IEEE Computer Society publications

    Page(s): nil1
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  • Power electronics - keeping pace with society

    Page(s): 1 - 2
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  • Dynamic Characterstics of the Push-Pull DC to DC Converter

    Page(s): 3 - 8
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    The dynamic characteristics of the push-pull dc to dc converter are analyzed both theoretically and experimentally for the modes of operation which are caused by the interaction between magnetizing current of the transformer and that of the reactor. Among all six modes of operation, four modes are of the first-order system. In two out of the four modes, the instantaneous reactor current does not fall to zero at any point in the switching cycle. View full abstract»

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  • DC-to-AC Series-Resonant Converter System with High Internal Frequency Generating Synthesized Waveforms for Multikilowatt Power Levels

    Page(s): 9 - 20
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    A new method of power pulse modulation with internal frequencies of tens of kHz and suited for multikilowatt power levels is applied to a series-resonant converter system for generating synthesized unipolar and bipolar waveforms. The high pulse frequency allows the principle of modulation and demodulation to be applied for fast system response and output waveforms with low distortion and prevents excessive stresses on components. Natural current commutation of the thyristors is obtained by the use of a series-resonant circuit for power transfer and control. Test results of a 4-kW thyristor converter system generating sinusoidal and nonsinusoidal waveforms independently of the load characteristics demonstrate the significant aspects for this class of power conversion. The material presented indicates the capability of the system to avoid excessive component stresses as well as the possibilities for fast-acting four-quadrant dc-to-dc, single-phase or polyphase dc-to-ac and ac-to-ac converter systems. View full abstract»

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  • A fast time domain digital simulation technique for power converters: Application to a buck converter with feedforward compensation

    Page(s): 21 - 31
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    Small-signal analysis was performed earlier to demonstrate the marked improvement of dynamic properties and stability margins of a switching regulator employing a novel feedforward input filter compensation scheme. A large-signal nonlinear recurrent time domain model is presented for the converter to analyze the transient response due to a step input change with and without the presence of the proposed feedforward loop. The results are verified with experimental data. View full abstract»

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  • A Programmable Transformer Coupled Converter for High-Power Space Applications

    Page(s): 32 - 38
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    A programmable transformer coupled converter (PTCC) is being developed by NASA/Marshall Space Flight Center for application in future large space power systems. The PTCC uses an internal microprocessor to control the output characteristics of its three Cuk integrated magnetics type power stages which have a combined capability of 5.4 kW (30 V at 180 A). Details of design trade-offs and test results are presented. View full abstract»

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  • Elimination of Leakage Effects Related to the Use of Windings with Fractions of Turns

    Page(s): 39 - 47
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    Obtaining exact output voltages from transformers is a difficult task due to discrete turn ratios. This becomes even more difficult in modern switching power supplies operating above 100 kHz because the number of turns per winding is reduced. For multichannel applications different methods of postregulation have been employed, resulting in increased power dissipation and power supply cost. A new method of dealing with this problem has been developed, offering a higher degree of flexibility. This technique allows the use of fractions of turns, while maintaining low leakage inductances. Theoretical analysis of leakage effects related to fractional turn windings has been derived and tests on an experimental transformer have been performed. View full abstract»

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  • Series- or Parallel-Connected Composite Amplifiers

    Page(s): 48 - 54
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    Power amplifiers based on combining two power stages where one supplies the bulk of the load power and the other ensures high output signal quality are discussed. The entire class of such combinations is described with particular attention given to a unique parallel topology. Experimental and theoretical results show that this topology has high performance without large efficiency or hardware penalties. View full abstract»

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  • Measurement of Loop Gain with the Digital Modulator

    Page(s): 55 - 62
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    A loop gain measurement technique for switching regulators using a digital modulator is introduced. While the conventional technique injects and measures the analog signals, the proposed digital modulator injects a digital perturbation and measures the resultant duty cycle modulation. Since the duty cycle signal, derived from all feedback loops, provides the ultimate control of a switching regulator, the loop gain defined at the duty cycle modulator is unique. Employing the digital modulator, this loop gain can be measured even with a switching regulator employing the current injected control. Furthermore, this new technique overcomes false measurement problems found in the conventional technique when the feedback signal at the point where the loop gain is measured contains a pulsating nature. View full abstract»

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  • IEEE copyright form

    Page(s): 63 - 64
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  • Information for authors

    Page(s): nil2
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  • [Front cover]

    Page(s): c2
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Aims & Scope

IEEE Transactions on Power Electronics covers fundamental technologies used in the control and conversion of electric power.

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