Electricity: electrical systems and devices – Safety and protection of systems and devices – Circuit interruption by thermal sensing
Patent
1990-04-20
1991-03-19
Deboer, Todd E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Circuit interruption by thermal sensing
361 93, 323907, H02H 504
Patent
active
050015931
ABSTRACT:
A circuit configuration for monitoring the temperature of power switching transistor integrated in a semiconductor circuit for overload protection includes temperature sensors each being associated with one respective power switching transistor for detecting the circuit temperature and issuing an output signal. Comparison stages are each connected to a respective one of the temperature sensors for comparing the output signal of one of the temperature sensors with a first reference corresponding to a first predetermined temperature value and switching off only the power switching transistor associated therewith upon attainment of the first predetermined temperature value. Logic elements are each connected to a respective one of the comparison for switching over the comparison stages associated with all of the other power switching transistors from the first reference corresponding to the first predetermined temperature value to a second reference corresponding to a second predetermined temperature value being higher than the first predetermined temperature value, upon attainment of the first predetermined temperature value at, and the shutoff of, a power switching transistor.
REFERENCES:
patent: 4345218 (1982-08-01), Congdon et al.
patent: 4821136 (1989-04-01), Murari et al.
patent: 4887181 (1989-12-01), Lenz
patent: 4910631 (1990-03-01), Murphy
Publication "The Am7938 Quad Exchange Power Controller (QEPC)", pp. 5-1 through 5-17.
Koroncai Adam-Istvan
Massoner Johann
Zitta Heinz
Deboer Todd E.
Greenberg Laurence A.
Lerner Herbert L.
Siemens Aktiengesellschaft
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