Protection of certain electrical systems by use of ptc device

Details Protection of certain electrical systems by use of ptc device Protection of certain electrical systems by use of ptc device

H - Electricity

02

H

348/14

H02H 9/02 (2006.01) H02H 5/04 (2006.01) H02H 7/22 (2006.01)

Patent

CA 1160724

ABRIDGEMENT The invention relates to electrical systems in which a PTC device is used to protect a circuit against a thermal or electrical fault. The systems of the invention comprise two circuits, one containing a PTC device and the other containing a resistor which is thermally coupled to the PTC device and which is heated when a fault condition occurs; this heating of the resistor converts the PTC device to the high resistance state and thus causes a desired change in the electrical condition of one or both circuits. The invention can be used for the electrical circuitry of an electric blanket, as illus- trated in Figure 1.

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