Electronic apparatus and surface temperature calculation method

Patent metadata

Field	Value
Publication number	US-10409301-B2
Application number	US-201615289223-A
Country	US
Kind code	B2
Filing date	Oct 10, 2016
Priority date	Nov 24, 2015
Publication date	Sep 10, 2019
Grant date	Sep 10, 2019

Abstract

An electronic apparatus includes a housing; a substrate disposed on the inner side of the housing; a plurality of temperature sensors disposed on the substrate; and a processor. The processor performs a procedure including calculating heat source temperatures of a plurality of heat sources disposed on the substrate from temperatures measured by the temperature sensors by using a first heat transfer model not including a first parameter representing a transient response of heat transfer from the heat sources to the temperature sensors; and calculating a surface temperature of a surface of the housing from the heat source temperatures by using a second heat transfer model including the first parameter and a second parameter representing a transient response of heat transfer from the heat sources to the surface.

First claim

What is claimed is:

1. An electronic apparatus comprising:
a housing;
a substrate disposed inside the housing;
a plurality of temperature sensors disposed on the substrate; and
a processor configured to perform a procedure including:
calculating heat source temperatures of a plurality of heat sources disposed on the substrate from measured temperatures measured by the temperature sensors, by using a first heat transfer model that assumes a steady state of heat transfer from the heat sources to the temperature sensors,
calculating a surface temperature of a surface of the housing from the heat source temperatures calculated by the first heat transfer model, by using a second heat transfer model including a first parameter representing a transient response of heat transfer from the heat sources to the temperature sensors and a second parameter representing a transient response of heat transfer from the heat sources to the surface, and
controlling at least part of operations of the heat sources, based on the calculated surface temperature;
wherein the first heat transfer model includes a first polynomial for calculating the heat source temperatures from the measured temperatures; and
the second heat transfer model includes a second polynomial for calculating the surface temperature from the heat source temperatures calculated by the first heat transfer model, calculation results of previous heat source temperatures, and calculation results of a previous surface temperature.

2. The electronic apparatus according to claim 1 , wherein:
the first parameter is a time constant representing response speed that indicates how fast changes in the heat source temperatures are reflected in the measured temperatures; and
the second parameter is a time constant representing response speed that indicates how fast the changes in the heat source temperatures are reflected in the surface temperature.

3. The electronic apparatus according to claim 1 , wherein:
the calculating of the surface temperature includes calculating, for a plurality of locations on the surface, a plurality of surface temperatures by using different second heat transfer models; and
the controlling is performed based on a maximum surface temperature amongst the calculated surface temperatures.

4. A surface temperature calculation method comprising:
acquiring, by a processor, measured temperatures measured by a plurality of temperature sensors disposed on a substrate provided inside a housing of an electronic apparatus;
calculating, by the processor, heat source temperatures of a plurality of heat sources disposed on the substrate from the measured temperatures by using a first heat transfer model that assumes a steady state of heat transfer from the heat sources to the temperature sensors;
calculating, by the processor, a surface temperature of a surface of the housing from the heat source temperatures calculated by the first heat transfer model, by using a second heat transfer model including a first parameter representing a transient response of heat transfer from the heat sources to the temperature sensors and a second parameter representing a transient response of heat transfer from the heat sources to the surface; and
controlling, by the processor, at least part of operations of the heat sources, based on the calculated surface temperature;
wherein the first heat transfer model includes a first polynomial for calculating the heat source temperatures from the measured temperatures; and
the second heat transfer model includes a second polynomial for calculating the surface temperature from the heat source temperatures calculated by the first heat transfer model, calculation results of previous heat source temperatures, and calculation results of a previous surface temperature.

5. A non-transitory computer-readable storage medium storing a computer program that causes a computer to perform a procedure comprising:
acquiring measured temperatures measured by a plurality of temperature sensors disposed on a substrate provided inside a housing of an electronic apparatus;
calculating heat source temperatures of a plurality of heat sources disposed on the substrate from the measured temperatures by using a first heat transfer model that assumes a steady state of heat transfer from the heat sources to the temperature sensors;
calculating a surface temperature of a surface of the housing from the heat source temperatures calculated by the first heat transfer model, by using a second heat transfer model including a first parameter representing a transient response of heat transfer from the heat sources to the temperature sensors and a second parameter representing a transient response of heat transfer from the heat sources to the surface; and
controlling at least part of operations of the heat sources, based on the calculated surface temperature;
wherein the first heat transfer model includes a first polynomial for calculating the heat source temperatures from the measured temperatures; and
the second heat transfer model includes a second polynomial for calculating the surface temperature from the heat source temperatures calculated by the first heat transfer model, calculation results of previous heat source temperatures, and calculation results of a previous surface temperature.

Assignees

• Fujitsu Ltd

Inventors

• Ishii Masatoshi
• Nakashima Yoshiyasu
• Nakao Hiroshi

Classifications

• G01K7/427

  Temperature calculation based on spatial modeling, e.g. spatial inter- or extrapolation · CPC title

• G06F1/206

  comprising thermal management · CPC title

• G05D23/1928

  sensing the temperature of one space · CPC title

• G05D23/1917 Primary

  using digital means · CPC title

• G01K7/22

  the element being a non-linear resistance, e.g. thermistor (G01K7/26 takes precedence) · CPC title