Electric power conversion systems – Current conversion – With condition responsive means to control the output...
Patent
1990-01-04
1992-02-25
Wong, Peter S.
Electric power conversion systems
Current conversion
With condition responsive means to control the output...
363 41, 363132, H02M 3335
Patent
active
050918419
ABSTRACT:
A procedure and apparatus for the control of solid-state switches in three-phase frequency converter and rectifier/inverter bridges is disclosed. Such control employs pulse width modulation. In this procedure, the modulation pulses of each phase are generated by comparing sinusoidal modulation references in an interval-by-interval manner to at least two triangular waves with a phase shift between them. The modulator unit for implementing the procedure incorporates one or more memory circuits storing the modulation reference curves, one or more D/A converters for converting the memory circuit outputs into analog form, and comparators for producing preliminary modulation pulses by comparing the sinusoidal modulation reference signals to at least two triangular waves shifted in phase relative to each other.
REFERENCES:
patent: 3906337 (1975-09-01), Depenbrock
patent: 4617675 (1986-10-01), Ashikaga et al.
patent: 4675802 (1987-06-01), Sugimoto
patent: 4723201 (1988-02-01), Tanamachi et al.
patent: 4907444 (1990-03-01), Tuusa
Kone Elevator GmbH
Wong Peter S.
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