Variable power resistor

Details Variable power resistor Variable power resistor

1990-12-19

1992-06-02

Lateef, Marvin M.

Electrical resistors

Mechanically variable

Movable contact electrically adjustable over length of...

338162, 338164, 338171, 338172, H01C 1010

Patent

active

051190630

ABSTRACT:
A variable power resistor includes a heat sink having a front face and a back face with an electrically insulating, thermally conductive ceramic coating bonded directly onto the front face such that the ceramic coating is in direct thermal contact with the heat sink. A plurality of discrete thick film conductive circuit pads are positioned on the electrically insulating, thermally conductive ceramic coating and a thick film resistive layer is positioned over portions of the conductive circuit pads such that the pads are electrically connected in series. The variable power resistor also includes a moveable contactor capable of contacting the circuit pads in order to vary the resistance of the resistor and an electrical connection between the resistor and an electrical circuit. The electrically insulating, thermally conductive ceramic coating may be plasma sprayed onto the heat sink, while the resistive circuit may be screen printed onto the ceramic coating.

REFERENCES:
patent: 3838071 (1974-09-01), Amin
patent: 4885434 (1989-12-01), Voltaggio et al.
patent: 5053283 (1991-10-01), Brown

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