Electricity: electrical systems and devices – Safety and protection of systems and devices – Circuit interruption by thermal sensing
Patent
1992-02-28
1993-11-30
DeBoer, Todd E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Circuit interruption by thermal sensing
361 78, H02H 504
Patent
active
052671186
ABSTRACT:
Circuitry (46, or 28 and 70) for thermally separating a power integrated circuit device (12) from a plurality of other such devices (14, 16, and 18) on a common power integrated circuit chip (10) operate when the device (12) reaches a thermal shutdown temperature setpoint (56) with an output current at a predetermined current limit (54). The circuitry 46, or 28 and 70 switches the output current to a shutdown current level (57) until the device (12) reaches a predetermined lower temperature setpoint (58). Circuitry (46, or 28 and 70) restores the output current level to the predetermined current limit only after the device (12) reaches both the predetermined lower temperature setpoint (58) and a predetermined circuit setpoint (62 or 74). The circuit setpoint (62 or 74) associates with the temperature of the device (12) and may be either a yet lower temperature setpoint (62) or a specified time delay (74). The above steps are repeated to lower the average temperature of the device (12) and thereby thermally separate the device (12) from the other of such devices (14, 16 and 18) on the common power integrated circuit chip (10).
REFERENCES:
patent: 4092693 (1978-05-01), Ishikawa et al.
patent: 5159520 (1992-10-01), Toyooka et al.
patent: 5206778 (1993-04-01), Flynn et al.
Buss Kenneth G.
Cotton David R.
Marshall Andrew
Braden Stanton C.
Deboer Todd E.
Donaldson Richard L.
Texas Instruments Incorporated
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