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Higher Reliability Electrical Circuits and Contacts Utilizing Vanadium Dioxide

IP.com Disclosure Number: IPCOM000234773D
Publication Date: 2014-Feb-03
Document File: 3 page(s) / 148K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a material and method to enhance the reliability of electrical circuits and contacts utilizing vanadium dioxide.

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Higher Reliability Electrical Circuits and Contacts Utilizing Vanadium Dioxide

Due to its unique characteristic of switching from acting as an electrical insulator to an electrical conductor at a temperature of 105C [*], vanadium dioxide (VO2) can be utilized in a variety of electrical applications to act as an electrical conducting shunt to prevent "runaway" over-current, burn, or other unsafe events when circuit or connector temperatures rise. Additionally, the vanadium dioxide coating provides temporary current-carrying capacity within connector

junctions in the event that a connection is temporarily misaligned. In high-reliability electronic

devices, there is always a great concern to prevent run-away thermal events (i.e., burns) and great care is taken in current design and manufacturing practices to ensure the most robust products. This concept utilizes the unique insulator/electrical characteristics of VO2 to function as a switch to prevent burn events in hardware. It has been shown that VO2 undergoes five orders of magnitude change in resistance (e.g., 100 ohms to 10 M ohms) over the temperature range of 40-70C (see Figure 1).

Figure 1

    By utilizing this material in a suitable high temperature, dielectric grease, high current can be shunted to ground before a burn event can occur. Shown below in Figure 2 is an embodiment utilizing a dielectric grease. In this case, a 12V pin is encapsulated with the grease (which contains a suitable loading level of VO2,...