Electricity: power supply or regulation systems – Input level responsive – Phase controlled switching using electronic tube or a three...
Patent
1981-10-19
1984-06-05
Shoop, William M.
Electricity: power supply or regulation systems
Input level responsive
Phase controlled switching using electronic tube or a three...
318806, 318808, 318809, G05F 500
Patent
active
044531222
ABSTRACT:
A voltage or current balancing control for supplying a balanced three-phase alternating current supply to an electrical three-phase load. Three controllable full wave semiconductor gates respectively feed one phase of a three-phase alternating current supply to the electrical load. The semiconductor gates are adapted to controllably adjust the voltage or current of a phase of the supply in accordance with a gate control signal to be applied thereto. A comparator circuit is connected to receive the three-phase alternating current supply and is adapted to compare either the voltage or current characteristics, or both (power) of each phase to determine an unbalanced condition therebetween which is analyzed by an analog or digital computer, which accordingly supplies gate control signals to the semiconductor gates respectively to independently control them in accordance with the unbalanced condition to adjust the voltage and/or current of all three phases of the supply to an equal or balanced condition.
REFERENCES:
patent: 3958172 (1976-05-01), Beck
patent: 4078191 (1978-03-01), Morters et al.
patent: 4078393 (1978-03-01), Wills
patent: 4122384 (1978-10-01), Suzuki
patent: 4289948 (1981-09-01), Jurek et al.
patent: 4346339 (1982-08-01), Lewandowski
Johnson Ewing A.
Straight Paul E.
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