Dual heater with ptc and fixed resistance elements

Details Dual heater with ptc and fixed resistance elements Dual heater with ptc and fixed resistance elements

H - Electricity

05

B

H05B 3/20 (2006.01) H05B 3/14 (2006.01) H05B 3/34 (2006.01) H05B 3/84 (2006.01)

Patent

CA 2289142

The heater includes a relatively fixed resistance heating element for providing a greater heating rate at lower ambient temperatures and/or high heat transfer environments. The heater further includes a relatively variable resistance heating PTC (positive temperature coefficient) element which has a resistance which increases in response to increased temperature, thereby providing self-regulation by way of reduced heat at increased temperatures. The relatively fixed and variable resistance heating elements are typically provided on opposite sides of a heating pad, but may be separated by a dielectric layer on a single side of a heating pad.

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