Electric power conversion systems – Frequency conversion without intermediate conversion to d.c. – By semiconductor converter
Patent
1982-06-18
1984-08-28
Pellinen, A. D.
Electric power conversion systems
Frequency conversion without intermediate conversion to d.c.
By semiconductor converter
318807, H02P 534, H02M 527
Patent
active
044687257
ABSTRACT:
A direct AC converter for converting a polyphase AC input supply into an output DC or single or polyphase AC supply of amplitude, phase, frequency or power factor which is different from the input supply using a matrix of bidirectional switches having contiguous width modulated conduction periods in cycles which synthesize the output supply voltage or voltages from samples of the input supply voltages taken cyclically at a much higher frequency than the supply frequency or frequencies. The switches are operated so that the or each output supply conductor is connected to only one of the input supply conductors at a time. The width modulation may be effected in response to phases of a sinusoidal oscillation to produce a frequency change. The output may have a "negative" frequency so that a phase displacement between current and voltage due to a reactive load appears in the opposite sense in the input supply. Width modulation may alternatively be effected by a combination of two sinusoidal oscillations so that the output frequency has equal positive and negative values to eliminate phase displacements in the input supply due to a reactive load. Motor speed control and generator output frequency control applications are described.
REFERENCES:
patent: 3493838 (1970-02-01), Gyugyi et al.
patent: 3585486 (1971-06-01), Gyugyi
patent: 3754180 (1973-08-01), Rauschenbach et al.
patent: 3816808 (1974-06-01), Enslin et al.
patent: 3971972 (1976-07-01), Stich
patent: 4008428 (1977-02-01), Waldmann et al.
patent: 4041368 (1977-08-01), Gritter
New Power Converter Technique Employing Power Transistors--A. Daniels, D. Slattery, "Proc. IEE" vol. 125, No. 2, Feb. 1978, pp. 146-150.
An Adjustable--Speed Induction Motor Drive with a Cycloconverter--Type Thyristor--Commutator in the Rotor--A. Chattopadhyay, IEEE Transactions on Industry Pub. vol. 1A-14, No. 2, Mar./Apr. 1978.
Merrett N. Rhys
Pellinen A. D.
Sharp Mel
Texas Instruments Incorporated
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