PTC switch protected termination resistor

Details PTC switch protected termination resistor PTC switch protected termination resistor

1994-03-10

1996-07-16

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

High voltage dissipation

361106, H02H 100

Patent

active

055372880

ABSTRACT:
The termination resistor of an electronic apparatus is connected in series with a thermistor PTC switch thermally coupled to the resistor. Excessive power dissipation in the resistor causes the PTC switch to trip, and the increased total resistance limits power dissipation in the resistor to safe levels. The PTC switch and the resistor may be merely in close physical proximity to one another to achieve the thermal coupling. Alternatively, the two may be fabricated as a unit assembly whose form factor is that of, or is similar to that of, the resistor that would otherwise be used by itself.

REFERENCES:
patent: 3562552 (1971-02-01), Baudino
patent: 4310837 (1982-01-01), Kornrumpf et al.
patent: 5153805 (1992-10-01), Tennant et al.
Thermistors by E. D. Macklen, 1979, from Electrochemical Publications--see Chapters 9-12, and especially p. 164 No Month.

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