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US 9,541,455 B2Granted
Device for localizing hot spots with heat flow meters
AssigneeCommissariat A L'energie Atomique Et Aux Energies Alternatives
InventorsTristan Caroff, Vincent Remondière
Life of this patent
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Abstract
The electronic device comprises a substrate provided with a surface comprising a region of interest, the thermal behavior of which is to be monitored, and a system for detecting hot spots located in the region of interest. The system for detecting hot spots comprises at least three separate heat flow meters arranged on the surface of the substrate outside of the region of interest.
Claims13
An electronic device comprising:
- a substrate provided with a surface and at least an active or a passive electronic component arranged in a region of interest comprised in the surface,
- a detection system configured to detect hot spots located in the region of interest, the detection system comprising:
- at least three separate heat flow meters arranged on the surface of the substrate outside of the region of interest, each heat flow meters being sensitive to a temperature gradient and configured to measure values representative of a heat flow generated by a hot spot in the region of interest;
- and
- a calculation unit configured to analyze the values of the different heat flow meters, and to determine the location of a hot spot in the region of interest,
- wherein the detection system comprises a system for acquiring electric signals from the heat flow meters with a measurement resolution rV, each heat flow meter comprising a number m of thermocouples, each thermocouple being provided with two legs made of thermoelectric materials having their height HNP defined by formula:
- H
- NP
- ≥
- R
- ×
- (
- exp
- (
- r
- V
- ×
- 2
-
- π
- ×
- λ
- sub
- ×
- ⅇ
- m
- ×
- S
- np
- ×
- Φ
- min
- )
- -
- 1
- )
- with R being the radius of the circle circumscribed in the region of interest, Snp the differential Seebeck coefficient of the thermoelectric materials of the legs, λsub the heat conductivity of the substrate, e the thickness of the substrate, and Φmin the minimum thermal power to be detected, dissipated by a hot spot in the region of interest.
34 more elements
An electronic device comprising:
- a substrate provided with a surface and at least an active or a passive electronic component arranged in a region of interest comprised in the surface, the substrate being a homogenous substrate having a constant thickness;
- and
- a detection system configured to detect hot spots located in the region of interest, the detection system comprising:
- at least three separate heat flow meters arranged on the surface of the substrate outside of the region of interest, each of the at least three separate heat flow meters being sensitive to a temperature gradient and configured to measure values representative of a heat flow generated by a hot spot in the region of interest;
- and
- a calculation unit configured to analyze values of each of the at least three separate heat flow meters, and to determine the location of the hot spot in the region of interest,
- wherein the detection system comprises a system for acquiring electric signals from the heat flow meters with a measurement resolution rV, each heat flow meter comprising a number m of thermocouples, each thermocouple being provided with two legs made of thermoelectric materials having their height HNP defined by formula:
- H
- NP
- ≥
- R
- ×
- (
- exp
- (
- r
- V
- ×
- 2
-
- π
- ×
- λ
- sub
- ×
- ⅇ
- m
- ×
- S
- np
- ×
- Φ
- min
- )
- -
- 1
- )
- with R being the radius of the circle circumscribed in the region of interest, Snp the differential Seebeck coefficient of the thermoelectric materials of the legs, λsub the heat conductivity of the substrate, e the thickness of the substrate, and Φmin the minimum thermal power to be detected, dissipated by a hot spot in the region of interest.
35 more elements
An electronic device comprising:
- a substrate provided with a surface and at least an active or a passive electronic component arranged in a region of interest comprised in the surface,
- a detection system configured to detect hot spots located in the region of interest, the detection system comprising:
- at least three separate heat flow meters arranged on the surface of the substrate outside of the region of interest, each heat flow meters being sensitive to a temperature gradient and configured to measure values representative of a heat flow generated by a hot spot in the region of interest;
- and
- a calculation unit configured to analyze the values of the different heat flow meters, and to determine the location of a hot spot in the region of interest,
- wherein each heat flow meter is provided with a detection axis defined as being the straight line with which the direction of the heat wave vector of a spot should be confounded to obtain the best accuracies and sensitivities of detection by the heat flow meter,
- the detection axis has a direction angle α relative to a straight line running through the center of gravity of the region of interest and the heat flow meter in the range from −π/4 to π/4 radian, inclusive, and
- the detection system comprises a system for acquiring electric signals from the heat flow meters with a measurement resolution rV, each heat flow meter comprising a number m of thermocouples, each thermocouple being provided with two legs made of thermoelectric materials having their height HNPα defined by formula:
- H
- NP
- α
- ≥
- R
- cos
-
-
- (
- α
- )
- ×
- (
- exp
- (
- r
- V
- ×
- 2
-
- π
- ×
- λ
- sub
- ×
- ⅇ
- m
- ×
- S
- np
- ×
- Φ
- min
- )
- -
- 1
- )
- with R being the radius of the circle circumscribed in the region of interest, Snp the differential Seebeck coefficient of the thermoelectric materials of the legs, λsub the heat conductivity of the substrate, e the thickness of the substrate, and Φmin the minimum thermal power to be detected, dissipated by the hot spot in the region of interest.
43 more elements
Dependencies are inferred from the claim text.