Frequency converter, procedure for controlling it and motor control using a frequency converter
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United States of America Patent
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-
Jun 4, 1996
Grant Date -
N/A
app pub date -
Dec 14, 1993
filing date -
Dec 22, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A procedure and an apparatus for converting a first alternating voltage into a second alternating voltage with respect to frequency and amplitude by means of first (1) and second (2) bridges having switches (T.sub.1 . . . T.sub.12), and a resonant circuit (3) connected between the bridges. The invention also relates to the use of a frequency converter for the control of a motor. The voltages of a supplying network and the voltages of a load (M) are connected across the resonant circuit (3) in an alternating fashion by means of bridge switches (T.sub.1 . . . T.sub.6) and bridge switches (T.sub.7 . . . T.sub.12), respectively. The voltages are alternately connected across the resonant circuit for a period equal to respective half cycles of the characteristic frequency of the resulting resonant circuit formed. When power is supplied, a bridge change is effected after each period.
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