Electric heating – Heating devices – With heating unit structure
Patent
1976-07-19
1978-04-25
Kozma, Thomas J.
Electric heating
Heating devices
With heating unit structure
219505, 219536, 219541, 338 22R, 338275, H05B 302, H01C 702
Patent
active
040864677
ABSTRACT:
A high voltage, high efficiency self-regulating heater comprises a thermally conductive housing having a chamber therein with a heating member in the chamber. The heating member includes a self-heating positive temperature coefficient (PTC) resistor element of a generally parallel-piped shape with its thickness dimension much less than its width dimension yielding two parallel face surfaces of larger area than two parallel edge surfaces. A layer of electrically conductive material is applied to the two parallel edge surfaces yielding an ohmic contact. The heater member further comprises two heat sink plates of thermally conductive, electrically insulating material which are positioned to engage the two broad face surfaces of the element. First and second terminal means are attached to the electrically conductive edge surfaces for supplying electrical power to the element to provide a heater in which the current flow is perpendicular to the major direction of heat flow to minimize banding of the element under high voltage use. The chamber is filled with an electrically insulating thermally conductive ceramic for providing good heat transfer.
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Haug John A.
Kozma Thomas J.
McAndrews James P.
Texas Instruments Incorporated
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