Electricity: electrical systems and devices – Safety and protection of systems and devices – Load shunting by fault responsive means
Patent
1994-09-06
1996-09-24
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Load shunting by fault responsive means
361 91, 361111, 361118, H02H 900
Patent
active
055596584
ABSTRACT:
Cascaded transistor stages are connected between a high voltage and a resistance coupled to a lower potential. The transistor stage closest to the lower potential is referred to as a driver stage, and all the other transistor stages are referred to as component stages. When an enable signal is provided to the driver stage, the stages sequentially enter conduction, starting with the driver stage and proceeding to the component stage coupled to the high voltage. The current flow through the driver stage is regulated, proportional to the value of the series resistance, and remains relatively constant as the high voltage is brought to close to the lower potential. The voltage drop is smooth and approximately linear, ensuring that voltage ringing or rebound does not occur following the discharge. After the high voltage is brought to the lower potential, the transistor stages remain in conduction as determined by the presence of the enable signal, to discharge any remaining high voltage that may be attached through a high series impedance. Upon removal of the enable signal, the transistor stages no longer conduct.
REFERENCES:
patent: 3539865 (1970-11-01), Billings
patent: 3569784 (1971-03-01), Carroll
patent: 3579036 (1971-05-01), McCoy
patent: 4054933 (1977-10-01), Praeg
patent: 4232351 (1980-11-01), Baker
patent: 4893070 (1990-01-01), Milberger
patent: 5196980 (1993-03-01), Carson
Cuthbert, D., Circle 522 HV Crowbar Switches 2.4 MW, Electronic Design, 144 (1991).
Adams Mark
Cooper James L.
ELDEC Corporation
Gaffin Jeffrey A.
Jackson Stephen W.
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