Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Reexamination Certificate
2005-02-04
2009-02-24
Jackson, Stephen W (Department: 2836)
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
Reexamination Certificate
active
07495879
ABSTRACT:
A solid-state magnet control includes a housing and magnet control circuitry mounted within the housing. The magnet control circuitry includes an insulated gate bipolar transistor (IGBT) bridge configuration andDUMPcircuitry. TheDUMPcircuitry inhibits circuit damage to the magnet control circuitry and other components contained within the magnet control caused by overvoltage and/or voltage transients. The magnet control circuitry controls current passing through the magnet. The IGBT bridge configuration includes aLIFT HIGHIGBT, aLIFT LOWIGBT, aCLEAN HIGHIGBT, and aCLEAN LOWIGBT, as well as a capacitor bank. TheDUMPcircuitry includes aDUMP HIGHIGBT, a discharge diode, and a discharge resistor. The magnet control is configured to provide power loss ride through, ground fault detection, and discharge voltage control, and can accept increased voltage supply to reduce charge-up time of the magnet, and existing operator control inputs through a relay interface.
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Japanese Patent Abstract for JP05343222.
English translation of JP-05-343222, Dec. 1993, Onari.
Christenson Eric S.
Thexton Andrew S.
Clark Christopher J
Jackson Stephen W
Litman Richard C.
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