Electricity: electrical systems and devices – Safety and protection of systems and devices – Circuit interruption by thermal sensing
Patent
1989-11-08
1992-03-24
Williams, Howard L.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Circuit interruption by thermal sensing
307310, 323907, 361 91, H02H 904
Patent
active
050993810
ABSTRACT:
An enable circuit that integrates thermal shutdown capability. The enable circuit utilizes a temperature insensitive threshold detector network that provides a desired biasing current when the ON/OFF signal applied at its input exceeds a preselected voltage. Thermally sensitive circuitry connected between the input of the threshold detector network and ground remains off when the ON/OFF signal is equal to the preselected voltage and the temperature of the enable circuit is below a preselected maximum temperature. However, when the temperature of the enable circuit reaches the preselected maximum temperature, the thermally sensitive circuitry turns on, clamping the input signal to the threshold detector network below the preselected voltage.
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National Semiconductor Corporation
Williams Howard L.
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