Symmetrical phase shifting apparatus, digital delaying device us

Details Symmetrical phase shifting apparatus, digital delaying device us Symmetrical phase shifting apparatus, digital delaying device us

1977-03-07

1978-12-26

Shoop, William M.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

H02M 7155

Patent

active

041319362

ABSTRACT:
A voltage controlled AC static power supply of the harmonic neutralization type uses symmetrical digital phase shifting in order to reconstruct, with pulses of variable width and predetermined different magnitudes generated by inverters, a sinusoidal wave of fundamental frequency. Phase-shifts are obtained digitally from a single pair of frequency signals. Variable length delay lines are used consisting of random-access-memory (RAM) devices in which a selected shift between read and write addresses establishes the desired amount of delay.

REFERENCES:
patent: 3521143 (1970-07-01), Anderson et al.
patent: 3725767 (1973-04-01), Corry
patent: 3859584 (1975-01-01), Corry
patent: 3889174 (1975-06-01), Corry

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