Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1985-08-29
1987-03-31
Salce, Patrick R.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 97, 364162, H02M 700, G06F 1520
Patent
active
046547738
ABSTRACT:
An inverter control circuit produces pulse width modulated waveform patterns approximating an a.c. power sine wave signal from a sequence of data words stored in ROM wherein the sequence is cycled over an interval corresponding to 7.5.degree. or 15.degree. of the desired sine wave. Respective portions of a 0.degree.-60.degree. segment and a 120.degree.-180.degree. segment of the desired sine wave are generated from corresponding bits of the words during successive 7.5.degree. or 15.degree. intervals. The 60.degree.-120.degree. segment is approximated by a steady state signal. Inversions of the 0.degree.-60.degree., 60.degree.-120.degree. and 120.degree.-180.degree. segments form the corresponding 180.degree.-240.degree., 240.degree.-300.degree. and 300.degree.-360.degree. segments. Selection of the appropriate generated segments during successive 60.degree. intervals produces one or more phases of the desired power signal. Further reduction in ROM requirement is made by stored data corresponding to only the first 30.degree. portions of the 0.degree.-60.degree. and 120.degree.-180.degree. segments; the full 60.degree. segments are formed by reversing the read out sequence, as well as the selector operation, during the second 30.degree. portion of the 60.degree. segments.
REFERENCES:
patent: 4290108 (1981-09-01), Woehrle et al.
patent: 4312031 (1982-01-01), Kudor
patent: 4337429 (1982-06-01), Stuart
patent: 4348734 (1982-09-01), Dougherty
patent: 4447786 (1984-05-01), Saar et al.
patent: 4466070 (1984-08-01), Claussen
Chonan Katsuhiko
Ito Tomotaka
Mitsubishi Denki & Kabushiki Kaisha
Salce Patrick R.
Todd Voeltz Emanuel
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