Method and apparatus for thermally separating devices on a power

Details Method and apparatus for thermally separating devices on a power Method and apparatus for thermally separating devices on a power

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.

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