Electrical systems comprising temperature sensitive devices

Details Electrical systems comprising temperature sensitive devices Electrical systems comprising temperature sensitive devices

H - Electricity

04

M

340/159, 379/2,

H04M 3/30 (2006.01) H01C 7/00 (2006.01) H03K 17/94 (2006.01)

Patent

CA 1228642

ABSTRACT OF THE DISCLOSURE An electrical system which comprises a temperature- sensitive device comprising a PTC or NTC element, a load in series with the temperature-sensitive device and a control device in parallel with the load and the temperature- sensitive device. The control device is a device whose resistance can be changed from a high value (which may be infinite) to a low value or vice versa, by a change in the electrical or physical environment thereof, e.g. a diode, triac, thyristor, PTC device or NTC device. By an appropriate change in the power source, e.g. its size or direction, or in the physical environment of the control device, e.g. its temperature, the relative resistances of the temperature- sensitive device and the control device can be reversed, thereby isolating or activating the load. The system is particularly useful for isolating a remote load, e.g. a telephone, while retaining a continuous circuit e.g. through the legs of a telephone circuit, for example for test purposes.

461267

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