DC link circuit for an electronically commutated motor
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United States of America Patent
Stats
-
Apr 30, 1996
Grant Date -
N/A
app pub date -
Mar 3, 1994
filing date -
Mar 3, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A protective DC link circuit connecting a motor to a power supply. The motor has a stationary assembly and a rotatable assembly in magnetic coupling relation thereto and includes windings adapted to be commutated in at least one preselected sequence. The motor also has power switches for selectively providing power to the windings in the preselected sequence by switching the power supply in connection with the windings whereby an electromagnetic field is produced for rotating the rotatable assembly. The DC link circuit connects the power supply to the power switches. The DC link circuit includes a link capacitor connected in parallel with the power supply wherein a voltage across the link capacitor defines a DC link voltage. The protective circuit also includes a comparator for detecting the DC link voltage and for generating an overvoltage signal representative of an overvoltage condition in the DC link circuit and a power switch for shunting current in the DC link circuit across the link capacitor thereby dissipating the overvoltage condition.
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