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Patent

Phase shifter for controlling the power components and power factor of a cycloconverter

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TLDR
A phase shifter circuit generates cycloconverter reference signals for independently and linearly controlling the real power and input power factor or real and reactive power in either polarity as discussed by the authors.
Abstract
A phase shifter circuit generates cycloconverter reference signals for independently and linearly controlling the real power and input power factor or real and reactive power in either polarity. Using the per phase line voltage as a reference phasor, its amplitude and phase are adjusted by a sine-cosine converter, analog multipliers and summing amplifiers. The phase shifter has an almost instantaneous response and can be controlled by polarity reversing dc control signals.

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Citations
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Methods and apparatus for controlling current in an electrical machine

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Method and apparatus for ac motor control

Arthur Naiman
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References
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Patent

Versatile cycloinverter power converter circuits

TL;DR: In this paper, a family of high-frequency-link solid state power converters having an input and output switching circuit that function as a high frequency parallel capacitor commutated control inverter and a cycloconverter output circuit to supply variable frequency and variable voltage power to a load is presented.
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Versatile power converters with a high frequency link

TL;DR: In this article, a power converter circuit with a high frequency transformer or capacitor link between input and output switching circuits is operated by a control computer to provide voltage, frequency, and phase conversion and regulation.
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TL;DR: In this article, a sample of the supply voltage for a power rectifier with phase control is passed through a filter which shifts it through a substantially constant phase angle of approximately n times 90*, where n is an integer, and may change its amplitude over a wide range with variation in supply voltage frequency.