Frequency converter with an intermediate buck-boost converter for controlling an electric motor
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United States of America Patent
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-
Apr 16, 2002
Grant Date -
N/A
app pub date -
Sep 27, 2000
filing date -
Sep 27, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The frequency converter is provided for an electric motor and comprises a rectifier, an intermediate circuit and an inverse rectifier which are connected with respect to circuiting technology via a control and regulation circuit. In the inverse rectifier to each motor phase there are allocated at least two electronic switches, one for the side conducting the higher potential and one for the side conducting the low potential. The intermediate circuit is formed as an active intermediate circuit and contains a Buck-Booster converter. It is controlled such that the voltage at the output of the intermediate circuit with respect to magnitude is always smaller than that at the input. By way of this inexpensive components may be used in the inverse rectifier and in particular also in the control and regulation circuit.
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