Journal ArticleDOI
A Method of Resonant Current Pulse Modulation for Power Converters
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TLDR
In this paper, a nonlinear, active network that transforms the voltage waveform of a unipolar source of energy is presented, which consists of ideally lossless elements such as inductors, capacitors, and on-off switches.Abstract:
A nonlinear, active network that transforms the voltage waveform of a unipolar source of energy is presented. This network consists of ideally lossless elements such as inductors, capacitors, and on-off switches. Control is obtained by variation of the mode of switch operation. A circuit philosophy is applied which is adapted to the characteristics of switch operation and confines the stresses imposed on circuit components to moderate levels. Results of experimental work are reported and include: 1) test data of a 95 percent efficient, 2-kW dc transformer having a power density of 0.4 kW/kg; and 2) integration of this transformer with a 20-cm ion propulsion engine for spacecraft.read more
Citations
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Patent
Factorized power architecture with point of load sine amplitude converters
TL;DR: In this article, a Factorized Power Architecture (FPA) method and apparatus includes a front end power regulator (PRM) which provides one or more controlled DC bus voltages which are distributed through the system and converted to the desired load voltages using voltage transformation modules (VTMs) at the point of load.
Journal ArticleDOI
Solid-State Transformers: On the Origins and Evolution of Key Concepts
Jonas E. Huber,Johann W. Kolar +1 more
TL;DR: In this paper, all main modern SST topologies realize the common key characteristics of these transformers-medium-frequency (MF) isolation stage, connection to medium voltage (MV), and controllability-by employing combinations of a very few key concepts, which have been described or patented as early as the 1960s.
Proceedings ArticleDOI
A review of soft-switched DC-AC converters
TL;DR: In this paper, the authors classify the soft-switched DC-AC topologies in a simple and generic way, based on the location of the resonant network (load, inverter bridge, and bus), the characteristic of switching waveforms (zerovoltage switching or zero-current switching), and the type of resonance (series or parallel).
Journal ArticleDOI
An Improved Method of Resonant Current Pulse Modulation for Power Converters
TL;DR: In this paper, a converter philosophy for controlled transfer and transformation of electric energy through internal series resonant circuits at high internal power frequencies in excess of 10 kHz is presented, which is suited for construction of failsafe and highly efficient, low cost, submegawatt, single module converters with currently available components.
Proceedings ArticleDOI
Volume/weight/cost comparison of a 1MVA 10 kV/400 V solid-state against a conventional low-frequency distribution transformer
Jonas E. Huber,Johann W. Kolar +1 more
TL;DR: In this paper, a comparison of a 1000kVA three-phase, low-frequency distribution transformer (LFT) and an equally rated SST, with respect to volume, weight, losses, and material costs, where the correspond- ing data of the SST is partly based on a full-scale prototype design, is presented.
References
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Journal ArticleDOI
An Improved Square-Wave Oscillator Circuit
TL;DR: In this article, a small saturable transformer is used to supply the transistor drive requirements in the improved squarewave oscillator circuit, where the feedback transformer derives its primary power for sufficient positive feedback from the output circuit either as a voltagedependent signal, a current dependent signal, or a combination of both.
Journal ArticleDOI
A wide-band wattmeter for the measurement and analysis of power dissipation in semiconductor switching devices
F.C. Schwarz,N.C. Voulgaris +1 more
TL;DR: In this article, a wattmeter with a wide-band (dc to 10 MHz) linear multiplier is used to observe the instantaneous product of the time-varying voltage and current in an arbitrary load.
Journal ArticleDOI
An unorthodox transformer for free-running parallel inverters
TL;DR: In this paper, a method for mitigation of unwanted magnetic energy and for the prevention of magnetic saturation in inverter transformer cores is presented; it is reinforced with quantitative relations and a report on experimental work.
ReportDOI
Switch modulation techniques
TL;DR: In this paper, an electronic integrator was used to simulate the operation of a saturable nuclear power plant. But the integrator's accuracy was only two orders of magnitude higher than that of the original operation of the plant.