Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1975-05-29
1977-06-14
Pellinen, A. D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307261, H02M 527
Patent
active
040300226
ABSTRACT:
A thyristor cycloconverter for frequency changing a 3-phase input supply to, commonly, a single-phase or 3-phase output supply. The output frequency can be near to, and even higher than, the input frequency without intolerable harmonics. A local oscillator generates a reference wave of output frequency, single-phase or 3-phase. Each reference wave is regularly sampled, twice each input supply cycle, and the sampled value stored to provide a step-form modified reference wave. Thyristor firing pulse trains are generated, during the period of the appropriate input supply commutation intervals, following the instants of amplitude equality of each step-form modified reference wave and each supply phase. A comparator provides a pulse output during alternate successive wave crossings. Output supply positive half-cycle thyristor firing pulse trains commence from the pulse trailing edges and negative half-cycle thyristor firing pulse trains commence from the pulse leading edges. Output supply frequency and amplitude are controlled according to frequency and amplitude of the reference waves.
REFERENCES:
patent: 3256244 (1966-06-01), Byloff et al.
patent: 3479528 (1969-11-01), Fisher
patent: 3603867 (1971-09-01), Cuenoud
patent: 3851260 (1974-11-01), Colin
National Research Development Corporation
Pellinen A. D.
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