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Method for a Statistical Thermal Solution Evaluation Tool

IP.com Disclosure Number: IPCOM000022001D
Publication Date: 2004-Feb-18
Document File: 4 page(s) / 26K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for a Statistical Thermal solution evaluation tool. Benefits include improved functionality.

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Method for a Statistical Thermal Solution Evaluation Tool

Disclosed is a method for a Statistical Thermal solution evaluation tool. Benefits include improved functionality.

Background

         Conventionally, when original equipment manufacturers (OEMs) design systems to meet component thermal specifications, they use a deterministic approach. Typically, all of the inputs used are based on 3-sigma values. This approach results in a very conservative design. As components dissipate more and more power, meeting the thermal specification is increasingly difficult using a deterministic design approach. In most instances, to remove conservatism in a deterministic design approach, OEMs arbitrarily derate the published component power value. If this power derating is not done correctly, OEMs could end up with an unreliable system due to a poorly designed thermal solution.

General description

         The disclosed method is a web-based Monte Carlo simulation tool that enables the OEM/user to realistically evaluate their systems’ cooling capabilities in real world environments.

         The key elements of the method include:

•         A web-based Monte Carlo simulation tool for thermal design

•         Separation of component manufacturer controlled parameters and OEM-controlled parameters

         -         Component manufacturer controlled proprietary parameters, such as the distribution/variation of maximum power among a large population of components, the variation in package resistance and other manufacturing tolerances, are completely hidden from OEMs/users

         -         For OEM-controlled parameters, such as external ambient, chassis temperature rise, and cooling solution thermal resistance, OEMs can enter arbitrary distribution (in terms of histograms) to describe the system’s thermal environment

• A tool that outputs the probability that a certain behavior occurs or does not occur given a set of inputs

Advantages

         The disclosed method provides advantages, including:

•         Improved functionality due to ensuring that OEM systems conform to the components published thermal specifications

Detailed description

         The disclosed method is a tool that enables OEMs to evaluate their systems against a thermal specification in a statistical manner that is correct. The tool removes the unnecessary conservatism associated with a deterministic design approach. The tool eliminates the requirement for OEMs to arbitrarily derate the published component power value, minimizing the chance of designing unreliable systems.

         Two sets of calculations are performed by the tool:

•         Performance loss exceedence per million (EPM), which is defined as the number of components which loose performance greater than or equal to a pre-determined value (e.g. 1.5%) due to thermal throttling by the component (throttling is where the component decreases it’s current draw, and thus decreasing its performance capabilities due to the part exceeding a set thermal thres...