Electricity: electrical systems and devices – Safety and protection of systems and devices – Circuit interruption by thermal sensing
Patent
1995-11-24
1997-03-11
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Circuit interruption by thermal sensing
361 98, 361101, H02H 504
Patent
active
056107927
ABSTRACT:
A method and apparatus for stopping the operation of a failed device and preventing that device from being turned back on is shown, using two thresholds, a first failure threshold is shown when the device may be turned off or prevented from further operation. A second safe operation threshold is shown, different from the first threshold and within the safe operation range of the device. As the temperature rises, this transistor is driven further to conduction diverting base current from a second transistor and driving it further into nonconduction. The collector current from the second transistor is diverted to a resistor providing additional bias to the temperature sensitive transistor and driving it to a new bias. This bias establishes the second threshold. According to the inventive principles, the device is prevented from being turned back on until the safe operating threshold is reached. Further, a second condition requiring the reset signal for the device to be cycled through one complete cycle from off to on is shown. In the preferred embodiment, a temperature sensitive transistor is shown having a negative temperature coefficient.
REFERENCES:
patent: 4092693 (1978-05-01), Ishikawa et al.
patent: 4345218 (1982-08-01), Congdon et al.
patent: 5099381 (1992-03-01), Wilcox
patent: 5267118 (1993-11-01), Marshall et al.
patent: 5359236 (1994-10-01), Giordano et al.
Gaffin Jeffrey A.
Rosenblatt Joel I.
Sherry Michael J.
LandOfFree
Apparatus for controlling the reset of a bus connected transceiv does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for controlling the reset of a bus connected transceiv, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for controlling the reset of a bus connected transceiv will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-448196