Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1989-04-28
1991-04-02
Wong, Peter S.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 95, H02M 742, H03B 2700
Patent
active
050051148
ABSTRACT:
An arrangement for generating phase-shifted sinusoidal voltages, in which a plurality of resistors are connected in series in a closed circular network to provide the sinusoidal voltages. Connecting junctions are located between the resistors, and each pair of connecting junctions has the same resistors therebetween. A source of direct-current voltage is cyclically advanced through the network so that two parallel branches of the network with the same number of resistors, are connected between the terminals of the voltage source. The resistors have all the same resistance values, and motor windings are connected between the connecting junctions. The voltage source is cyclically connected in sequence to the connecting junctions, so that phase-shifted sinusoidal voltage functions appear at the connecting junctions for the purpose of operating a motor. An annular shift register is synchronized by pulses from a generator and has as many output terminals as there are resistors in the network. These output terminals are, in turn, connected to switching stages that advance the direct-current voltage in a cyclical sequence from the output terminals of the shift register to the resistance network.
REFERENCES:
patent: 1691986 (1928-11-01), Nyquist
patent: 3052833 (1962-09-01), Coolidge et al.
patent: 3919619 (1975-11-01), Corry
patent: 4344123 (1982-08-01), Bhagwat et al.
patent: 4467407 (1984-08-01), Asano et al.
patent: 4685043 (1987-08-01), Mehert
Deutsche Thomson-Brandt GmbH
Fogiel Max
Wong Peter S.
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