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Method for an active two-phase thermal solution for burn-in

IP.com Disclosure Number: IPCOM000010684D
Publication Date: 2003-Jan-08
Document File: 3 page(s) / 75K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for an active two-phase thermal solution for burn-in (BI). Benefits include improved thermal performance, improved reliability, and improved design flexibility.

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Method for an active two-phase thermal solution for burn-in

Disclosed is a method for an active two-phase thermal solution for burn-in (BI). Benefits include improved thermal performance, improved reliability, and improved design flexibility.

Background

        � � � � � Conventional technology utilizes a single-phase liquid-cooled heatsink as a thermal solution for BI. The heat removed is proportional to ΔT.

        � � � � � With the conventional method, equipment reaches its end of life (EOL) due to the inability to further scale the thermal solution to more extreme thermal loads.

General description

        � � � � � The disclosed method is an active two-phase thermal solution for BI. The method provides a refrigeration-like thermodynamic cycle to cool devices during BI (see Figure 1). Liquid refrigerant flows through the pump, past the thermal control valve, and into the evaporator where the refrigerant begins to vaporize from the device’s power. A two-phase liquid-vapor mixture exits the evaporator to the heat exchanger where the vapor condenses back into liquid form. The process repeats as the liquid exits the heat exchanger.

        � � � � � Device Tj is monitored and the refrigerant flow-rate through the evaporator is controlled using a standard proportional-integral-derivative (PID) controller and a thermal control valve. This arrangement provides active thermal control (ATC) of the device under test (DUT). Device spread is minimized, reducing the overall BI time.

        � � � � � The key elements of the method include:

•        � � � � Evaporator

•        � � � � Flow control valve

•        � � � � Pump

•        � � � � Heat exchanger

•        � � � � Refrigerant that is used as a working fluid

Advantages

        � � � � � The disclosed method provides advantages, including:

•        � � � � Improved thermal performance d...