Electricity: electrical systems and devices – Safety and protection of systems and devices – Circuit interruption by thermal sensing
Patent
1995-02-23
2000-09-26
Jackson, Stephen W.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Circuit interruption by thermal sensing
361 94, 361115, H02H 500
Patent
active
061250244
ABSTRACT:
A solid state power controller for switching power on and off to an electrical load which also serves as a circuit protection device protecting the load and/or the wire connected between the load output terminal of the controller and ground from thermal damage due to current overload is shown. Upon current overload the controller interrupts current to the load in a time inversely proportional to the square of the magnitude of the overload. The controller also limits the load current to a selected maximum level by controlling the drain-source resistance of power MOSFETs (PS1-7) used for switching power. A secondary interrupt is provided in the event that the junction temperature of the MOSFETs has risen to a selected maximum level. A thermal memory feature is included for both interrupt signals. The controller is controlled by a single on/off input line (COMMAND) and provides both a status (STATUS) and trip (TRIP) output line. The status can be configured to monitor load voltage or load current flow. The controller also can be configured to default to either an on or off state in the event the input line is disconnected. The controller is made so that it is externally programmable by providing selected external connection points (MPA, DTA, CLA1, CLA2) and choosing values of certain components (R.sub.cl1i, R.sub.cl2i, R.sub.ii, C.sub.ii, R.sub.mpi, C.sub.mpi) contained within the sealed controller package which results in a selected default condition.
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Larson Eric K.
LeComte Norman E.
Maher Thomas R.
Baumann Russell E.
Jackson Stephen W.
Telecky Jr. Frederick J.
Texas Instruments Incorporated
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