Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1984-07-03
1987-08-04
Salce, Patrick R.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 37, 363 97, H02M 112
Patent
active
046850422
ABSTRACT:
An inverter circuit for a power train has a rectifier for rectifying a three phase AC input and a filter comprising an inductor and capacitor to produce a filtered DC signal for application to the inverter. A high to low voltage transducer receives the filtered DC signal to produce a low voltage output representation thereof. A leading phase shifter shifts the low voltage signal in phase. A sample and hold amplifier receives shifted signal, and a pulse generator generates timing pulses applied to the sample and volt amplifier, whereby the sample and hold amplifier produces an output signal amplitude corresponding to the amplitude of the shifted signal during periods indicated by the pulse generator output. A triangle wave generator provides a triangle wave output to a pulse width modulator, which also receives the output from the sample and hold amplifier to produce an output pulse indicative of the signal level of the filtered DC output. Finally, a decoder receives the width modulated pulses, and an inverter switching circuit receives the decoded pulse width signals to produce a three phase output having reduced modulation.
REFERENCES:
patent: 3746963 (1973-07-01), VeNard
patent: 4246633 (1981-01-01), Borkovitz
patent: 4386394 (1983-05-01), Kocher et al.
patent: 4409535 (1983-10-01), Hickman
patent: 4472672 (1984-09-01), Pacholok
patent: 4520437 (1985-05-01), Borttcher et al.
patent: 4521840 (1985-06-01), Hoadley
Glaser Kenneth R.
Salce Patrick R.
Starratt Jeffrey
Unitron, Inc.
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