Electricity: electrical systems and devices – Safety and protection of systems and devices – Transformer protection
Patent
1994-03-03
1996-04-30
DeBoer, Todd
Electricity: electrical systems and devices
Safety and protection of systems and devices
Transformer protection
361 56, 318439, H02H 708
Patent
active
055130585
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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DeBoer Todd
General Electric Company
Krisher, Jr. Ralph E.
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