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Protective Barrier For Maintaining Required Insulation During Power Supply Faults

IP.com Disclosure Number: IPCOM000021958D
Original Publication Date: 2004-Feb-17
Included in the Prior Art Database: 2004-Feb-17
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Abstract

Protective barrier for maintaining required insulation during power supply faults.

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Protective Barrier For Maintaining Required Insulation During Power Supply Faults

Disclosed is a device for maintaining required insulation during power supply faults. Compliance with product safety standards requires that fault testing not result in the breakdown of electrical insulation within power supplies. Breakdown of insulation is determined by the application of a dielectric strength test (high voltage applied across an insulation barrier that must not cause current runaway). Certain faults can cause damage to electrical components that may cause normal insulation distances referred to as creepage (distance over surfaces) and clearance (distance through air) to be compromised.

    Various product safety standards (such as IEC 60950, Safety of Information Technology Equipment) call for such testing to be performed to ensure a safe product. These standards in many cases are tied to legal/regulatory requirements at the local or national level.

    The concept presented here is to provide a nonconductive barrier in areas susceptible to component damage, which may cause failure of the subsequent dielectric strength test. There are two application of this concept covered herein. The first is an physical barrier intended to increase the creepage distance from the point of the component damage to other affected areas (such as a grounded screw). The second concept is a nonconductive coating applied to the printed circuit board, which provides a added layer of insulation....