Electrical transmission or interconnection systems – Plural supply circuits or sources – One source floats across or compensates for other source
Patent
1980-11-21
1982-05-18
Beha, Jr., William H.
Electrical transmission or interconnection systems
Plural supply circuits or sources
One source floats across or compensates for other source
307 66, 328133, 363 96, H02J 332
Patent
active
043307175
ABSTRACT:
A phase adjustment circuit for sensing the phase of the signal at the output of an inverter and for providing a signal to the control circuits of the inverter whose phase has been offset by a preselected amount. The phase adjustment circuit includes a zero crossover detector for sensing the crossover points of the inverter output voltage. A phase-locked loop includes a phase comparator which receives the signal indicating the zero crossover points and a feedback signal from a phase shifter. The output of the phase comparator is an error signal which is integrated and presented to a voltage controlled oscillator to change the phase of its output signal. The phase shifter combines the phased waveform out of the voltage controlled oscillator with a command signal indicating the desired phase offset to form a feedback signal for presentation to the phase comparator closing the feedback loop. At the same time, the phase comparator provides a signal to the control circuit of the inverter whose phase has been precisely controlled to lead or lag the inverter output waveform by the desired offset.
REFERENCES:
patent: 3199037 (1965-08-01), Graves
patent: 3337814 (1967-08-01), Brase et al.
patent: 3551826 (1970-12-01), Sepe
patent: 3863134 (1975-01-01), Pollard
patent: 3872397 (1975-03-01), Hanneman
patent: 4071780 (1978-01-01), Burnett
patent: 4241261 (1980-12-01), Ebert
patent: 4251735 (1981-02-01), Coleman
patent: 4251736 (1981-02-01), Coleman
IEEE Paper F 77101-9, "The Interaction of Batteries and Fuel Cells with Electrical Distribution Systems:***", Jan. 30, 1977.
Beha Jr. William H.
Lange Richard P.
United Technologies Corporation
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