Control circuit for a half-wave brushless motor with a surge limiter
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United States of America Patent
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-
Mar 1, 1994
Grant Date -
N/A
app pub date -
Oct 1, 1992
filing date -
Oct 15, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A control circuit for a half-wave brushless motor. The control circuit includes n circuit branches, each with an electronic power switch connected in series with the respective winding or phase of the motor across the terminals of a voltage source in parallel to the other n-1 circuit branches, a pilot circuit for providing enabling signals to render the power switches selectively conductive, current recirculation elements for dissipating transient current that flows in each phase of the motor whenever the associated power switch is turned off, and a voltage limiter for limiting, to a predetermined threshold voltage, the voltage surge due to the transient current.
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