Multilayer conductive polymer positive temperature coefficient device
First Claim
1. A method of fabricating a multilayer conductive polymer PTC device, comprising the steps of:
- (a) forming a laminated structure by laminating a first conductive polymer PTC layer between an upper metal foil electrode layer and a center metal foil electrode layer, and a second conductive polymer PTC layer between the center metal foil electrode layer and a lower metal foil electrode layer;
(b) separating an electrically isolated portion of each of the upper and lower electrode layers from a main portion of the upper and lower electrode layers;
(c) forming an input terminal electrically connecting the isolated portions of the upper and lower electrode layers to each other and to the center electrode layer;
(d) forming an upper output terminal on the main portion of the upper electrode layer and a lower output terminal on the main portion of the lower electrode layer; and
(e) electrically connecting the upper and lower output terminals to each other.
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Abstract
A conductive polymer PTC device includes upper, lower, and center electrodes, with a first PTC conductive polymer layer between the upper and center electrodes, and a second PTC conductive polymer layer between the center and lower electrodes. Each of the upper and lower electrodes is separated into an isolated portion and a main portion. The isolated portions of the upper and lower electrodes are electrically connected to each other and to the center electrode by an input terminal. Upper and lower output terminals are provided, respectively, on the main portions of the upper and lower electrodes and are electrically connected to each other. The resulting device is, effectively, two PTC devices connected in parallel, thereby providing an increased effective cross-sectional area for the current flow path, and thus a larger hold current, for a given footprint.
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Citations
5 Claims
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1. A method of fabricating a multilayer conductive polymer PTC device, comprising the steps of:
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(a) forming a laminated structure by laminating a first conductive polymer PTC layer between an upper metal foil electrode layer and a center metal foil electrode layer, and a second conductive polymer PTC layer between the center metal foil electrode layer and a lower metal foil electrode layer;
(b) separating an electrically isolated portion of each of the upper and lower electrode layers from a main portion of the upper and lower electrode layers;
(c) forming an input terminal electrically connecting the isolated portions of the upper and lower electrode layers to each other and to the center electrode layer;
(d) forming an upper output terminal on the main portion of the upper electrode layer and a lower output terminal on the main portion of the lower electrode layer; and
(e) electrically connecting the upper and lower output terminals to each other. - View Dependent Claims (2, 3, 4, 5)
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Specification