Electricity: electrical systems and devices – Safety and protection of systems and devices – Load shunting by fault responsive means
Patent
1990-01-04
1991-08-06
DeBoer, Todd E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Load shunting by fault responsive means
361 18, 361 86, 361 91, 363 55, H02H 904
Patent
active
050382446
ABSTRACT:
A device for overvoltage protection of a rectifier bridge feeding a d.c. motor and implemented using fully gate-controlled solid-state switches without zero diodes, and for control of the d.c. motor during emergency braking is disclosed. To protect at least the switches of the rectifier bridge against overvoltages and to control the d.c. motor during emergency braking, the device incorporates a capacitor connected via diodes both to the d.c. circuit and the a.c. circuit and, connected in parallel with said capacitor, a series cirucit of a fully gate-controlled solid-state switch and a resistor, said solid-state switch being controlled by a control unit in such manner that, when the voltage between at least two connections in the a.c. or d.c. circuit rises above the voltage across the capacitor, the solid-state switch turns on when said voltage between the connection rises above the excitation value and turns off when it falls below the turn-off value, and that during emergency braking the solid-state switch is turned on.
REFERENCES:
patent: 4331994 (1982-05-01), Wirth
patent: 4482854 (1984-11-01), Kawada et al.
patent: 4545464 (1985-10-01), Nomura
patent: 4843533 (1989-06-01), Roof et al.
Deboer Todd E.
Kone Elevator GmbH
LandOfFree
Device for overvoltage protection of a rectifier bridge feeding does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for overvoltage protection of a rectifier bridge feeding , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for overvoltage protection of a rectifier bridge feeding will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1991282