WO2021083493A1 - A device for controlling an air flow for cooling an electrical component - Google Patents

A device for controlling an air flow for cooling an electrical component Download PDF

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Publication number
WO2021083493A1
WO2021083493A1 PCT/EP2019/079482 EP2019079482W WO2021083493A1 WO 2021083493 A1 WO2021083493 A1 WO 2021083493A1 EP 2019079482 W EP2019079482 W EP 2019079482W WO 2021083493 A1 WO2021083493 A1 WO 2021083493A1
Authority
WO
WIPO (PCT)
Prior art keywords
air flow
electrical component
flow guiding
cooling
ambient temperature
Prior art date
Application number
PCT/EP2019/079482
Other languages
French (fr)
Inventor
Niklas LEKSELIUS
Fredrik Ohlsson
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to PCT/EP2019/079482 priority Critical patent/WO2021083493A1/en
Publication of WO2021083493A1 publication Critical patent/WO2021083493A1/en

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
    • H05K7/20136—Forced ventilation, e.g. by fans
    • H05K7/20145—Means for directing air flow, e.g. ducts, deflectors, plenum or guides
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/01—Control of temperature without auxiliary power
    • G05D23/02—Control of temperature without auxiliary power with sensing element expanding and contracting in response to changes of temperature
    • G05D23/08—Control of temperature without auxiliary power with sensing element expanding and contracting in response to changes of temperature with bimetallic element
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
    • H05K7/20136—Forced ventilation, e.g. by fans
    • H05K7/20154—Heat dissipaters coupled to components
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2255/00—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes
    • F28F2255/04—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes comprising shape memory alloys or bimetallic elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels

Definitions

  • the invention relates to a device for controlling an air flow for cooling an electrical component and a heat sink comprising such a device.
  • High power components in varying surrounding temperature can experience stress due to temperature movements and different temperature expansion properties in e.g. the printed circuit board (PCB), soldering and component package. This can lead to reliability problems for high power components operating in environments where there are large and/or frequent variations in the surrounding temperature.
  • PCB printed circuit board
  • An objective of embodiments of the invention is to provide a solution which mitigates or solves the drawbacks and problems of conventional solutions.
  • a device for controlling an air flow for cooling an electrical component comprises an air flow guiding device configured to guide the air flow; and a bi-metal device coupled to the air flow guiding device, and configured to control the air flow guiding device so that the air flow for cooling the electrical component is increased when an ambient temperature of the electrical component is increased, and the air flow for cooling the electrical component is decreased when the ambient temperature of the electrical component is decreased.
  • An advantage of the device according to the first aspect is that the device can control the air flow for cooling the electrical component based on the ambient temperature of the electrical component.
  • a dynamic cooling of the electrical component is achieved which stabilizes the ambient temperature.
  • the delta temperature experienced by the electrical component can be reduced.
  • the reliability and component lifetime of the electrical component can be increased, resulting in increased system reliability and decreased operational expenditure (OPEX).
  • a further advantage of the device according to the first aspect is that the air flow is controlled by the bi-metal device which automatically reacts to changes in the ambient temperature. Thereby, the dynamic cooling of the electrical component can be operated automatically, eliminating the need for a control system.
  • the bi-metal device is further configured to control the air flow guiding device by changing the position of the air flow guiding device relative to the air flow.
  • An advantage with this implementation form is that the bi-metal device can control the airflow and hence the cooling of the electrical component based on the position of the air flow guiding device.
  • the bi-metal device is further configured to control the air flow guiding device from a first position resulting in a first air flow to a second position resulting in a second air flow when the ambient temperature of the electrical component changes from a first ambient temperature to a second ambient temperature, wherein the first air flow is lower than the second air flow when the first ambient temperature is lower than the second ambient temperature, or vice versa.
  • An advantage with this implementation form is that that the bi-metal device can control the air flow based on the ambient temperature of the electrical component. Thereby, providing a dynamic cooling of the electrical component which stabilizes the ambient temperature of the electrical component.
  • the first air flow is a minimum air flow and the second air flow is a maximum air flow.
  • the device can provide a minimum cooling effect and a maximum cooling effect.
  • the bi-metal device is further configured to control the air flow guiding device into one or more intermediate positions between the first position and the second position at corresponding one or more intermediate ambient temperatures between the first ambient temperature and the second ambient temperature.
  • An advantage with this implementation form is that the device can provide different cooling effects adapted to different ambient temperatures, thereby providing an even and stable ambient temperature.
  • the air flow guiding device comprises one or more air flow guiding means.
  • An advantage with this implementation form is that a flexible design of the air flow guiding device can be provided.
  • the one or more air flow guiding means are any one from the group comprising: plates, flaps, discs, and sheets.
  • An advantage with this implementation form is that the shape of air flow guiding means are suitable to guide the air flow such that the air flow can be changed.
  • the bi-metal device is coupled to the air flow guiding device by means of a coupling means extending along an axis of rotation A.
  • An advantage with this implementation form is that the bi-metal device and the air flow guiding device are coupled in a flexible way.
  • the coupling means is any one from the group comprising: a rod, a shaft, a tube, and an axle.
  • the one or more air flow guiding means are attached along the coupling means, and wherein the bi-metal device is further configured to control the one or more airflow guiding means by rotating the one or more airflow guiding means around the axis of rotation A.
  • the one or more air flow guiding means extend perpendicular to the axis of rotation A.
  • An advantage with this implementation form is that the one or more air flow guiding means can be arranged to provide an efficient guiding of the airflow.
  • the bi-metal device is attached at an end of the coupling means.
  • the bi-metal device comprises a bi-metal spring.
  • An advantage with this implementation form is that the bi-metal device can convert a change in the ambient temperature into mechanical displacement.
  • the bi-metal spring is a coil spring or a spiral spring.
  • bi-metal device can convert a change in the ambient temperature into mechanical displacement in the form of coiling and uncoiling movements.
  • a heat sink for cooling an electrical component comprising a device for controlling an air flow for cooling an electrical component according to any of the implementation forms of a device according to the first aspect.
  • An advantage of the heat sink according to the second aspect are the same as those for the corresponding implementation forms of the device according to the first aspect.
  • heat sink further comprises one or more air channels, wherein each air channel is configured to provide an air flow through the heat sink for cooling the electrical component, and wherein the device is configured to control the air flow through the one or more air channels.
  • An advantage with this implementation form is that a dynamic cooling per air channel can be provided.
  • the air flow guiding device comprises one or more air flow guiding means, and each one or more air flow guiding means is configured to guide the air flow through one of the one or more air channels.
  • An advantage with this implementation form is that a dynamic cooling per air channel can be provided.
  • the bi-metal device is coupled to the one or more air flow guiding means by means of a coupling means extending along an axis of rotation A perpendicular to the one or more air channels.
  • An advantage with this implementation form is that the one or more air flow guiding means can be arranged along the axis of rotation A in a respective air channel, thereby providing a dynamic cooling in the respective air channels.
  • the one or more air channels are formed by one or more cooling fins extending perpendicular to the axis of rotation A, and wherein the coupling means extends through the one or more cooling fins.
  • An advantage with this implementation form is that it provides a simple and robust way of arranging the device in the heat sink.
  • the bi-metal device is arranged adjacent to the electrical component.
  • an advantage with this implementation form is that the ambient temperature of the bi-metal device and the ambient temperature of the electrical component are essentially the same. Thereby, the bi-metal device can accurately control the air flow for cooling the electrical component depending on the ambient temperature of the electrical component such that a suitable cooling can be provided.
  • the electrical component is a high power component.
  • An advantage with this implementation form is that high power component can cause large variations in ambient temperature, thereby making it more important to be able to provide dynamic cooling.
  • FIG. 1 shows a device according to an embodiment of the invention
  • FIGS. 2a-b show positions of an air flow guiding device according to an embodiment of the invention
  • FIG. 3 shows a heat sink according to an embodiment of the invention.
  • FIG. 4a-b show positions of an air flow guiding device in a heat sink according to an embodiment of the invention.
  • Fig. 1 shows a device 100 for controlling an air flow for cooling an electrical component 200 (not shown in Fig. 1 ) according to an embodiment of the invention.
  • the device 100 comprises an air flow guiding device 102 configured to guide the air flow for cooling the electrical component 200 and a bi-metal device 104 coupled to the air flow guiding device 102.
  • the air flow for cooling the electrical component 200 is assumed to flow in the first direction D1 .
  • the device 100 may comprises more than one air flow guiding device 102, where each air flow guiding device 102 is coupled to the bi-metal device 104.
  • the air flow guiding devices 102 may be configured to guide air flows for cooling the same electrical component 200 or different electrical component 200.
  • the device 100 may in embodiments be configured to cool more than one electrical component 200.
  • the bi-metal device 104 is configured to control the air flow guiding device 102 so that the air flow for cooling the electrical component 200 is increased when an ambient temperature of the electrical component 200 is increased, and the air flow for cooling the electrical component 200 is decreased when the ambient temperature of the electrical component 200 is decreased.
  • the bi-metal device 104 is configured to control the air flow guiding device 102 by changing the position of the air flow guiding device 102 relative to the air flow.
  • the air flow is re-directed such that the amount of air flowing past the electrical component 200 is changed, e.g. increased or decreased.
  • the device 100 may increase or decrease the air flow for cooling the electrical component 200.
  • the electrical component 200 to be cooled may be any electrical component which generates heat when in operation.
  • the electrical component 200 may a high power component such as e.g. a high power integrated circuit (IC), a central processing unit (CPU) or an application specific integrated circuit (ASIC) but is not limited thereto.
  • the air flow for cooling the electrical component 200 may be an air flow flowing past the electrical component 200 such that hot air in the surroundings of the electrical component 200 is replaced with cooler air.
  • the air flow for cooling the electrical component 200 may further be an airflow arising from e.g. convection or an air flow generated by a fan or similar.
  • the air flow guiding device 102 may comprise one or more air flow guiding means 106.
  • the one or more air flow guiding means 106 may be any one from the group comprising: plates, flaps, discs, and sheets.
  • the shape of the one or more air flow guiding means 106 may hence be predominately flat and thin, i.e. mainly extend in one direction.
  • each airflow guiding device 102 comprises five airflow guiding means 106 in the shape of rectangular flaps.
  • the air flow guiding device 102 may comprise any number of air flow guiding means 106 of any shape without deviating from the scope of the invention.
  • the bi-metal device 104 may be coupled to the air flow guiding device 102 by means of a coupling means 108 extending along an axis of rotation A, as shown in Fig. 1.
  • the coupling means 108 may be any one from the group comprising: a rod, a shaft, a tube, and an axle.
  • the coupling means 108 may hence have an elongated shape extending along the axis of rotation A.
  • the one or more air flow guiding means 106 may be attached along the coupling means 108 and may further extend perpendicular to the axis of rotation A.
  • the bi-metal device 104 comprises a bi-metal spring such as e.g. a coil spring or a spiral spring.
  • the bi-metal device 104 may hence convert temperature changes in the ambient temperature into mechanical displacements in the form of a coiling and an uncoiling movement.
  • the bi-metal device 104 may be configured to uncoil when the ambient temperature increases and coil when the ambient temperature decreases, or vice versa.
  • the bi-metal device 104 is attached at an end of the coupling means 108.
  • the bi-metal device 104 is a coil spring with its center attached to the end of the coupling means 108.
  • the bi-metal device 104 may be attached to the coupling means 108 such that coiling or uncoiling of the bi-metal device 104 leads to a rotation of the coupling means 108 around the axis of rotation A.
  • the air flow guiding means 106 may be attached along the coupling means 108 and may further be fixed in relation to the coupling means 108.
  • the air flow guiding means 106 may further extend perpendicular to the axis of rotation A on both sides of the coupling means 108. As the airflow guiding means 106 are fixed in relation to the coupling means 108, a rotation of the coupling means 108 around the axis of rotation A will lead to a rotation of the one or more air flow guiding means 106 around the axis of rotation A. Thus, the bi-metal device 104 may, through the coupling means 108, change the position of the air flow guiding means 106, i.e. rotate the air flow guiding means 106 around the axis of rotation A, when coiling and uncoiling. Hence, the bi metal device 104 may control the position of the one or more airflow guiding means 106 based on the ambient temperature.
  • the bi-metal device 104 may control the air flow guiding device 102 between at least a first position and a second position.
  • the first position may result in a first air flow and the second position may result in a second air flow.
  • the bi-metal device 104 may control the air flow guiding device 102 from the first position resulting in the first air flow to the second position resulting in the second airflow, when the ambient temperature of the electrical component 200 changes from a first ambient temperature to a second ambient temperature.
  • the first air flow may be lower than the second air flow, when the first ambient temperature is lower than the second ambient temperature, or vice versa.
  • the bi-metal device 104 may further control the air flow guiding device 102 from the second position to the first position, when the ambient temperature of the electrical component 200 changes from the second ambient temperature to the first ambient temperature.
  • the bi-metal device 104 may further control the air flow guiding device 102 into one or more intermediate positions between the first position and the second position at corresponding one or more intermediate ambient temperatures between the first ambient temperature and the second ambient temperature.
  • the bi-metal device 104 is a coil spring
  • the bi-metal device 104 may uncoil when the ambient temperature increases, thereby gradually rotating the air flow guiding device 102 from the first position through a number of intermediate positions to the second position.
  • the bi-metal device 104 may control the air flow guiding device 102 between a first position P1 resulting in a first airflow and a second position P2 resulting in a second air flow, where the first air flow is a minimum air flow and the second air flow is a maximum air flow.
  • the first ambient temperature is hence lower than the second ambient temperature.
  • the direction of the air flow relative to the device 100 is the same as shown in Fig. 1 , i.e. the air flows in the first direction D1 .
  • Fig. 2a shows the air flow guiding device 102 in the first position P1 resulting in the first air flow.
  • the one or more air flow guiding means 106 of the airflow guiding device 102 is positioned essentially perpendicular to the air flow.
  • the air flow guiding device 102 re-directs a major part or the air flow such that the air flow is mainly blocked, i.e. no or only a minor part of the air in the air flow will flow past the electrical component 200.
  • the airflow guiding device 102 is in the first position P1 the resulting first airflow is hence a minimum air flow providing a low cooling effect.
  • Fig. 2b shows the airflow guiding device 102 in the second position P2 resulting in the second air flow.
  • the one or more air flow guiding means 106 of the air flow guiding device 102 are positioned essentially parallel to the airflow.
  • the airflow guiding device 102 allows the air flow to flow essentially freely, i.e. all or a major part of the air in the air flow will flow past the electrical component 200.
  • the resulting second air flow is hence a maximum air flow proving a high cooling effect.
  • each intermediate position may result in a specific airflow.
  • the airflow of each intermediate position is based on the position of the air flow guiding device 102 relative to the air flow, i.e. the position of the one or more air flow guiding means 106 relative to the direction of the air flow being guided by the one or more air flow guiding means 106. The more parallel the one or more air flow guiding means 106 are to the direction of the airflow, the larger the airflow will be.
  • the air flow guiding device 102 When the bi-metal device 104 controls the airflow guiding device 102 by rotating the one or more air flow guiding means 106 around the axis of rotation A, the air flow can be gradually increased or decreased based on the ambient temperature. Thereby, providing a cooling for the electrical component 200 which may adapt to changes in the ambient temperature.
  • Embodiments of the invention also include a heat sink 300 for cooling an electrical component 200.
  • the heat sink 300 comprises the device 100 for controlling an air flow for cooling the electrical component 200 according to any of the embodiments of the device 100.
  • the heat sink 300 may provide conventional cooling of the electrical component 200 and may be arranged to abut or be adjacent to the electrical component 200.
  • the heat sink 300 may further provide dynamic cooling of the electrical component 200 according to the invention using the device 100.
  • the electrical component 200 to be cooled may be any electrical component which generates heat when in operation.
  • the electrical component 200 may be a high power component such as e.g. a high power IC, a CPU or an ASIC but is not limited thereto.
  • Fig. 3 shows the heat sink 300 according to an embodiment of the invention.
  • the heat sink 300 is arranged to cool two electrical components 200.
  • the heat sink comprises the device 100 and further comprises one or more air channels 302.
  • Each air channel 302 is configured to provide an air flow through the heat sink 300 for cooling the electrical components 200.
  • the air flow is assumed to flow in the first direction D1.
  • the device 100 is configured to control the air flow through the one or more air channels 302.
  • the one or more air channels 302 may e.g. be formed by one or more cooling fins 304, as shown in Fig. 3.
  • each one or more air flow guiding means 106 may be configured to guide the air flow through one of the one or more air channels 302.
  • the device 100 may be arranged in the heat sink 300 such that one air flow guiding means 106 is arranged in each air channels 302 through which the device 100 should control the air flow, as shown in Fig. 3 and Fig. 4a.
  • the bi-metal device 104 may be coupled to the one or more air flow guiding means 106 by means of a coupling means 108 extending along an axis of rotation A perpendicular to the one or more air channels 302.
  • the one or more airflow guiding means 106 may be attached along the coupling means 108 with the one or more air flow guiding means 106 arranged in the respective one or more air channels 302.
  • the coupling means 108 may further extend through the one or more cooling fins.
  • Fig. 4a shows the air flow guiding means 106 in the heat sink 300 in the first position P1 resulting in the first air flow.
  • the bi-metal device 104 may control the air flow guiding means 106 to the first position P1 at the first ambient temperature.
  • the air flow guiding means 106 are positioned essentially perpendicular to the air flow.
  • the air flow guiding means 106 re-direct a major part or the air flow such that the air flow is mainly blocked, i.e. no or only a minor part of the air in the air flow will flow through the respective air channel 302 past the electrical component 200.
  • the air flow guiding means 106 are in the first position P1 , the resulting first air flow is hence a small air flow providing a low cooling effect.
  • Fig. 4b shows the air flow guiding means 106 in the heat sink 300 in the second position P2 resulting in the second air flow.
  • the bi-metal device 104 may control the air flow guiding means 106 to the second position P2 at the second ambient temperature.
  • the air flow guiding means 106 are positioned essentially parallel to the air flow.
  • the air flow guiding means 106 allows the air flow to flow essentially freely, i.e. all or a major part of the air in the air flow will flow through the respective air channel 302 past the electrical component 200.
  • the air flow guiding means 106 are in the second position P2, the resulting second airflow is hence a large air flow proving a high cooling effect.
  • the bi-metal device 104 may be arranged adjacent to the electrical component 200. In this way, the bi-metal device 104 is exposed to essentially the same ambient temperature as the electrical component 200. Thereby, the bi-metal device 104 can accurately control the air flow for cooling the electrical component 200 depending on the ambient temperature of the electrical component 200. With reference to Figs. 3 and 4a-b, the bi-metal device 104 may be arranged at one outer side of the heat sink 300. However, the bi-metal device 104 may in embodiments instead be arranged within the heat sink 300, e.g. arranged in one of the one or more air channel 302 located close to the electrical component 200.

Abstract

The invention relates to a device (100) for controlling an air flow for cooling an electrical component (200) based on an ambient temperature of the electrical component (200). The device (100) comprises a bi-metal device (104) coupled to an air flow guiding device (102) guiding the air flow for cooling the electrical component (200). The bi-metal device (104) controls the air flow guiding device (102) such that the air flow for cooling the electrical component (200) is increased when the ambient temperature of the electrical component (200) is increased and the air flow for cooling the electrical component (200) is decreased when the ambient temperature of the electrical component (200) is decreased. The invention further relates to a heat sink 300 for cooling the electrical component (200) comprising the device (100).

Description

A DEVICE FOR CONTROLLING AN AIR FLOW FOR COOLING AN ELECTRICAL
COMPONENT
Technical Field
The invention relates to a device for controlling an air flow for cooling an electrical component and a heat sink comprising such a device.
Background
High power components in varying surrounding temperature can experience stress due to temperature movements and different temperature expansion properties in e.g. the printed circuit board (PCB), soldering and component package. This can lead to reliability problems for high power components operating in environments where there are large and/or frequent variations in the surrounding temperature.
Summary
An objective of embodiments of the invention is to provide a solution which mitigates or solves the drawbacks and problems of conventional solutions.
The above and further objectives are solved by the subject matter of the independent claims. Further advantageous embodiments of the invention can be found in the dependent claims.
According to a first aspect of the invention, the above mentioned and other objectives are achieved with a device for controlling an air flow for cooling an electrical component, the device comprises an air flow guiding device configured to guide the air flow; and a bi-metal device coupled to the air flow guiding device, and configured to control the air flow guiding device so that the air flow for cooling the electrical component is increased when an ambient temperature of the electrical component is increased, and the air flow for cooling the electrical component is decreased when the ambient temperature of the electrical component is decreased.
An advantage of the device according to the first aspect is that the device can control the air flow for cooling the electrical component based on the ambient temperature of the electrical component. By increasing the air flow when the ambient temperature increases and decreasing the air flow when the ambient temperature decreases, a dynamic cooling of the electrical component is achieved which stabilizes the ambient temperature. Thus, the delta temperature experienced by the electrical component can be reduced. Thereby, the reliability and component lifetime of the electrical component can be increased, resulting in increased system reliability and decreased operational expenditure (OPEX).
A further advantage of the device according to the first aspect is that the air flow is controlled by the bi-metal device which automatically reacts to changes in the ambient temperature. Thereby, the dynamic cooling of the electrical component can be operated automatically, eliminating the need for a control system.
In an implementation form of a device according to the first aspect, the bi-metal device is further configured to control the air flow guiding device by changing the position of the air flow guiding device relative to the air flow.
An advantage with this implementation form is that the bi-metal device can control the airflow and hence the cooling of the electrical component based on the position of the air flow guiding device.
In an implementation form of a device according to the first aspect, the bi-metal device is further configured to control the air flow guiding device from a first position resulting in a first air flow to a second position resulting in a second air flow when the ambient temperature of the electrical component changes from a first ambient temperature to a second ambient temperature, wherein the first air flow is lower than the second air flow when the first ambient temperature is lower than the second ambient temperature, or vice versa.
An advantage with this implementation form is that that the bi-metal device can control the air flow based on the ambient temperature of the electrical component. Thereby, providing a dynamic cooling of the electrical component which stabilizes the ambient temperature of the electrical component.
In an implementation form of a device according to the first aspect, the first air flow is a minimum air flow and the second air flow is a maximum air flow.
An advantage with this implementation form is that the device can provide a minimum cooling effect and a maximum cooling effect. In an implementation form of a device according to the first aspect, the bi-metal device is further configured to control the air flow guiding device into one or more intermediate positions between the first position and the second position at corresponding one or more intermediate ambient temperatures between the first ambient temperature and the second ambient temperature.
An advantage with this implementation form is that the device can provide different cooling effects adapted to different ambient temperatures, thereby providing an even and stable ambient temperature.
In an implementation form of a device according to the first aspect, the air flow guiding device comprises one or more air flow guiding means.
An advantage with this implementation form is that a flexible design of the air flow guiding device can be provided.
In an implementation form of a device according to the first aspect, the one or more air flow guiding means are any one from the group comprising: plates, flaps, discs, and sheets.
An advantage with this implementation form is that the shape of air flow guiding means are suitable to guide the air flow such that the air flow can be changed.
In an implementation form of a device according to the first aspect, the bi-metal device is coupled to the air flow guiding device by means of a coupling means extending along an axis of rotation A.
An advantage with this implementation form is that the bi-metal device and the air flow guiding device are coupled in a flexible way.
In an implementation form of a device according to the first aspect, the coupling means is any one from the group comprising: a rod, a shaft, a tube, and an axle.
In an implementation form of a device according to the first aspect, the one or more air flow guiding means are attached along the coupling means, and wherein the bi-metal device is further configured to control the one or more airflow guiding means by rotating the one or more airflow guiding means around the axis of rotation A. An advantage with this implementation form is that the bi-metal device can control the one or more air flow guiding means in an efficient movement which does not require much space.
In an implementation form of a device according to the first aspect, the one or more air flow guiding means extend perpendicular to the axis of rotation A.
An advantage with this implementation form is that the one or more air flow guiding means can be arranged to provide an efficient guiding of the airflow.
In an implementation form of a device according to the first aspect, the bi-metal device is attached at an end of the coupling means.
In an implementation form of a device according to the first aspect, the bi-metal device comprises a bi-metal spring.
An advantage with this implementation form is that the bi-metal device can convert a change in the ambient temperature into mechanical displacement.
In an implementation form of a device according to the first aspect, the bi-metal spring is a coil spring or a spiral spring.
An advantage with this implementation form is that bi-metal device can convert a change in the ambient temperature into mechanical displacement in the form of coiling and uncoiling movements.
According to a second aspect of the invention, the above mentioned and other objectives are achieved with a heat sink for cooling an electrical component, the heat sink comprising a device for controlling an air flow for cooling an electrical component according to any of the implementation forms of a device according to the first aspect.
An advantage of the heat sink according to the second aspect are the same as those for the corresponding implementation forms of the device according to the first aspect.
In an implementation form of a heat sink according to the second aspect, heat sink further comprises one or more air channels, wherein each air channel is configured to provide an air flow through the heat sink for cooling the electrical component, and wherein the device is configured to control the air flow through the one or more air channels.
An advantage with this implementation form is that a dynamic cooling per air channel can be provided.
In an implementation form of a heat sink according to the second aspect, the air flow guiding device comprises one or more air flow guiding means, and each one or more air flow guiding means is configured to guide the air flow through one of the one or more air channels.
An advantage with this implementation form is that a dynamic cooling per air channel can be provided.
In an implementation form of a heat sink according to the second aspect, the bi-metal device is coupled to the one or more air flow guiding means by means of a coupling means extending along an axis of rotation A perpendicular to the one or more air channels.
An advantage with this implementation form is that the one or more air flow guiding means can be arranged along the axis of rotation A in a respective air channel, thereby providing a dynamic cooling in the respective air channels.
In an implementation form of a heat sink according to the second aspect, the one or more air channels are formed by one or more cooling fins extending perpendicular to the axis of rotation A, and wherein the coupling means extends through the one or more cooling fins.
An advantage with this implementation form is that it provides a simple and robust way of arranging the device in the heat sink.
In an implementation form of a heat sink according to the second aspect, the bi-metal device is arranged adjacent to the electrical component.
An advantage with this implementation form is that the ambient temperature of the bi-metal device and the ambient temperature of the electrical component are essentially the same. Thereby, the bi-metal device can accurately control the air flow for cooling the electrical component depending on the ambient temperature of the electrical component such that a suitable cooling can be provided. In an implementation form of a heat sink according to the second aspect, the electrical component is a high power component.
An advantage with this implementation form is that high power component can cause large variations in ambient temperature, thereby making it more important to be able to provide dynamic cooling.
Further applications and advantages of the embodiments of the invention will be apparent from the following detailed description.
Brief Description of the Drawings
The appended drawings are intended to clarify and explain different embodiments of the invention, in which:
- Fig. 1 shows a device according to an embodiment of the invention;
- Figs. 2a-b show positions of an air flow guiding device according to an embodiment of the invention;
- Fig. 3 shows a heat sink according to an embodiment of the invention; and
- Figs. 4a-b show positions of an air flow guiding device in a heat sink according to an embodiment of the invention.
Detailed Description
Variations in ambient/surrounding temperature of high power components can lead to reliability problems due to temperature movements and temperature expansions in the high power components. To avoid these types of problems the temperature of the high power component and its immediate surrounding should be kept as stable as possible. One way to achieve a stable temperature is to keep the dissipated power from the high power component at a constant level, i.e. keep the heat load constant even when there is no need for high power dissipation. However, this approach causes unnecessary power consumption and increases the operating cost.
The objective of the invention is to reduce variations in the ambient temperature of high power components without having to keep the dissipated power higher than required. The objective is achieved with a device which provides dynamic cooling by decreasing the cooling capacity when the heat load goes down and increasing the cooling capacity when the heat load goes up. Fig. 1 shows a device 100 for controlling an air flow for cooling an electrical component 200 (not shown in Fig. 1 ) according to an embodiment of the invention. The device 100 comprises an air flow guiding device 102 configured to guide the air flow for cooling the electrical component 200 and a bi-metal device 104 coupled to the air flow guiding device 102. The air flow for cooling the electrical component 200 is assumed to flow in the first direction D1 .
With reference to Fig. 1 , the device 100 may comprises more than one air flow guiding device 102, where each air flow guiding device 102 is coupled to the bi-metal device 104. In such embodiments, the air flow guiding devices 102 may be configured to guide air flows for cooling the same electrical component 200 or different electrical component 200. Thus, the device 100 may in embodiments be configured to cool more than one electrical component 200.
The bi-metal device 104 is configured to control the air flow guiding device 102 so that the air flow for cooling the electrical component 200 is increased when an ambient temperature of the electrical component 200 is increased, and the air flow for cooling the electrical component 200 is decreased when the ambient temperature of the electrical component 200 is decreased. According to embodiments of the invention the bi-metal device 104 is configured to control the air flow guiding device 102 by changing the position of the air flow guiding device 102 relative to the air flow. When the position of the air flow guiding device 102 changes relative to the air flow guided by the air flow guiding device 102, the air flow is re-directed such that the amount of air flowing past the electrical component 200 is changed, e.g. increased or decreased. Thus, by changing the position of the air flow guiding device 102, the device 100 may increase or decrease the air flow for cooling the electrical component 200.
The electrical component 200 to be cooled may be any electrical component which generates heat when in operation. In embodiments, the electrical component 200 may a high power component such as e.g. a high power integrated circuit (IC), a central processing unit (CPU) or an application specific integrated circuit (ASIC) but is not limited thereto. The air flow for cooling the electrical component 200 may be an air flow flowing past the electrical component 200 such that hot air in the surroundings of the electrical component 200 is replaced with cooler air. The air flow for cooling the electrical component 200 may further be an airflow arising from e.g. convection or an air flow generated by a fan or similar.
The air flow guiding device 102 may comprise one or more air flow guiding means 106. The one or more air flow guiding means 106 may be any one from the group comprising: plates, flaps, discs, and sheets. The shape of the one or more air flow guiding means 106 may hence be predominately flat and thin, i.e. mainly extend in one direction. In the embodiment shown in Fig. 1 , each airflow guiding device 102 comprises five airflow guiding means 106 in the shape of rectangular flaps. However, the air flow guiding device 102 may comprise any number of air flow guiding means 106 of any shape without deviating from the scope of the invention.
The bi-metal device 104 may be coupled to the air flow guiding device 102 by means of a coupling means 108 extending along an axis of rotation A, as shown in Fig. 1. The coupling means 108 may be any one from the group comprising: a rod, a shaft, a tube, and an axle. The coupling means 108 may hence have an elongated shape extending along the axis of rotation A. The one or more air flow guiding means 106 may be attached along the coupling means 108 and may further extend perpendicular to the axis of rotation A.
According to embodiments of the invention the bi-metal device 104 comprises a bi-metal spring such as e.g. a coil spring or a spiral spring. The bi-metal device 104 may hence convert temperature changes in the ambient temperature into mechanical displacements in the form of a coiling and an uncoiling movement. For example, the bi-metal device 104 may be configured to uncoil when the ambient temperature increases and coil when the ambient temperature decreases, or vice versa.
In the embodiment shown in Fig. 1 , the bi-metal device 104 is attached at an end of the coupling means 108. The bi-metal device 104 is a coil spring with its center attached to the end of the coupling means 108. The bi-metal device 104 may be attached to the coupling means 108 such that coiling or uncoiling of the bi-metal device 104 leads to a rotation of the coupling means 108 around the axis of rotation A. With reference to Fig. 1 , the air flow guiding means 106 may be attached along the coupling means 108 and may further be fixed in relation to the coupling means 108. The air flow guiding means 106 may further extend perpendicular to the axis of rotation A on both sides of the coupling means 108. As the airflow guiding means 106 are fixed in relation to the coupling means 108, a rotation of the coupling means 108 around the axis of rotation A will lead to a rotation of the one or more air flow guiding means 106 around the axis of rotation A. Thus, the bi-metal device 104 may, through the coupling means 108, change the position of the air flow guiding means 106, i.e. rotate the air flow guiding means 106 around the axis of rotation A, when coiling and uncoiling. Hence, the bi metal device 104 may control the position of the one or more airflow guiding means 106 based on the ambient temperature.
The bi-metal device 104 may control the air flow guiding device 102 between at least a first position and a second position. The first position may result in a first air flow and the second position may result in a second air flow. The bi-metal device 104 may control the air flow guiding device 102 from the first position resulting in the first air flow to the second position resulting in the second airflow, when the ambient temperature of the electrical component 200 changes from a first ambient temperature to a second ambient temperature. The first air flow may be lower than the second air flow, when the first ambient temperature is lower than the second ambient temperature, or vice versa. The bi-metal device 104 may further control the air flow guiding device 102 from the second position to the first position, when the ambient temperature of the electrical component 200 changes from the second ambient temperature to the first ambient temperature.
In embodiments, the bi-metal device 104 may further control the air flow guiding device 102 into one or more intermediate positions between the first position and the second position at corresponding one or more intermediate ambient temperatures between the first ambient temperature and the second ambient temperature. For example, when the bi-metal device 104 is a coil spring, the bi-metal device 104 may uncoil when the ambient temperature increases, thereby gradually rotating the air flow guiding device 102 from the first position through a number of intermediate positions to the second position.
With reference to Figs. 2a-b, the bi-metal device 104 may control the air flow guiding device 102 between a first position P1 resulting in a first airflow and a second position P2 resulting in a second air flow, where the first air flow is a minimum air flow and the second air flow is a maximum air flow. In the embodiment shown in Figs. 2a-b, the first ambient temperature is hence lower than the second ambient temperature. Furthermore, it is assumed that the direction of the air flow relative to the device 100 is the same as shown in Fig. 1 , i.e. the air flows in the first direction D1 .
Fig. 2a shows the air flow guiding device 102 in the first position P1 resulting in the first air flow. In the first position P1 , the one or more air flow guiding means 106 of the airflow guiding device 102 is positioned essentially perpendicular to the air flow. Hence, the air flow guiding device 102 re-directs a major part or the air flow such that the air flow is mainly blocked, i.e. no or only a minor part of the air in the air flow will flow past the electrical component 200. When the airflow guiding device 102 is in the first position P1 the resulting first airflow is hence a minimum air flow providing a low cooling effect.
Fig. 2b shows the airflow guiding device 102 in the second position P2 resulting in the second air flow. In the second position P2, the one or more air flow guiding means 106 of the air flow guiding device 102 are positioned essentially parallel to the airflow. Hence, the airflow guiding device 102 allows the air flow to flow essentially freely, i.e. all or a major part of the air in the air flow will flow past the electrical component 200. When the air flow guiding device 102 is in the second position P2 the resulting second air flow is hence a maximum air flow proving a high cooling effect.
In embodiments where the bi-metal device 104 controls the air flow guiding device 102 into one or more intermediate positions, each intermediate position may result in a specific airflow. The airflow of each intermediate position is based on the position of the air flow guiding device 102 relative to the air flow, i.e. the position of the one or more air flow guiding means 106 relative to the direction of the air flow being guided by the one or more air flow guiding means 106. The more parallel the one or more air flow guiding means 106 are to the direction of the airflow, the larger the airflow will be. When the bi-metal device 104 controls the airflow guiding device 102 by rotating the one or more air flow guiding means 106 around the axis of rotation A, the air flow can be gradually increased or decreased based on the ambient temperature. Thereby, providing a cooling for the electrical component 200 which may adapt to changes in the ambient temperature.
Embodiments of the invention also include a heat sink 300 for cooling an electrical component 200. The heat sink 300 comprises the device 100 for controlling an air flow for cooling the electrical component 200 according to any of the embodiments of the device 100. The heat sink 300 may provide conventional cooling of the electrical component 200 and may be arranged to abut or be adjacent to the electrical component 200. The heat sink 300 may further provide dynamic cooling of the electrical component 200 according to the invention using the device 100. The electrical component 200 to be cooled may be any electrical component which generates heat when in operation. In embodiments, the electrical component 200 may be a high power component such as e.g. a high power IC, a CPU or an ASIC but is not limited thereto.
Fig. 3 shows the heat sink 300 according to an embodiment of the invention. In the embodiment shown in Fig. 3, the heat sink 300 is arranged to cool two electrical components 200. The heat sink comprises the device 100 and further comprises one or more air channels 302. Each air channel 302 is configured to provide an air flow through the heat sink 300 for cooling the electrical components 200. In the embodiment shown in Fig. 3, the air flow is assumed to flow in the first direction D1. The device 100 is configured to control the air flow through the one or more air channels 302. The one or more air channels 302 may e.g. be formed by one or more cooling fins 304, as shown in Fig. 3. In embodiments where the air flow guiding device 102 comprises one or more air flow guiding means 106, each one or more air flow guiding means 106 may be configured to guide the air flow through one of the one or more air channels 302. Thus, the device 100 may be arranged in the heat sink 300 such that one air flow guiding means 106 is arranged in each air channels 302 through which the device 100 should control the air flow, as shown in Fig. 3 and Fig. 4a.
With reference to Fig. 3, the bi-metal device 104 may be coupled to the one or more air flow guiding means 106 by means of a coupling means 108 extending along an axis of rotation A perpendicular to the one or more air channels 302. In this way, the one or more airflow guiding means 106 may be attached along the coupling means 108 with the one or more air flow guiding means 106 arranged in the respective one or more air channels 302. When the one or more air channels 302 are formed by one or more cooling fins and the cooling fins extend perpendicular to the axis of rotation A, the coupling means 108 may further extend through the one or more cooling fins.
Fig. 4a shows the air flow guiding means 106 in the heat sink 300 in the first position P1 resulting in the first air flow. As previously described, the bi-metal device 104 may control the air flow guiding means 106 to the first position P1 at the first ambient temperature. In the first position P1 , the air flow guiding means 106 are positioned essentially perpendicular to the air flow. Hence, the air flow guiding means 106 re-direct a major part or the air flow such that the air flow is mainly blocked, i.e. no or only a minor part of the air in the air flow will flow through the respective air channel 302 past the electrical component 200. When the air flow guiding means 106 are in the first position P1 , the resulting first air flow is hence a small air flow providing a low cooling effect.
Fig. 4b shows the air flow guiding means 106 in the heat sink 300 in the second position P2 resulting in the second air flow. As previously described, the bi-metal device 104 may control the air flow guiding means 106 to the second position P2 at the second ambient temperature. In the second position P2, the air flow guiding means 106 are positioned essentially parallel to the air flow. Hence, the air flow guiding means 106 allows the air flow to flow essentially freely, i.e. all or a major part of the air in the air flow will flow through the respective air channel 302 past the electrical component 200. When the air flow guiding means 106 are in the second position P2, the resulting second airflow is hence a large air flow proving a high cooling effect.
The bi-metal device 104 may be arranged adjacent to the electrical component 200. In this way, the bi-metal device 104 is exposed to essentially the same ambient temperature as the electrical component 200. Thereby, the bi-metal device 104 can accurately control the air flow for cooling the electrical component 200 depending on the ambient temperature of the electrical component 200. With reference to Figs. 3 and 4a-b, the bi-metal device 104 may be arranged at one outer side of the heat sink 300. However, the bi-metal device 104 may in embodiments instead be arranged within the heat sink 300, e.g. arranged in one of the one or more air channel 302 located close to the electrical component 200.
Finally, it should be understood that the invention is not limited to the embodiments described above, but also relates to and incorporates all embodiments within the scope of the appended independent claims.

Claims

1 . A device (100) for controlling an air flow for cooling an electrical component (200), the device (100) comprising an air flow guiding device (102) configured to guide the air flow; and a bi-metal device (104) coupled to the air flow guiding device (102), and configured to control the airflow guiding device (102) so that the air flow for cooling the electrical component (200) is increased when an ambient temperature of the electrical component (200) is increased, and the air flow for cooling the electrical component (200) is decreased when the ambient temperature of the electrical component (200) is decreased.
2. A device (100) according to claim 1 , wherein the bi-metal device (104) is configured to control the air flow guiding device (102) by changing the position of the air flow guiding device (102) relative to the air flow.
3. A device (100) according to claim 2, wherein the bi-metal device (104) is configured to control the air flow guiding device (102) from a first position resulting in a first air flow to a second position resulting in a second air flow when the ambient temperature of the electrical component (200) changes from a first ambient temperature to a second ambient temperature, wherein the first air flow is lower than the second air flow when the first ambient temperature is lower than the second ambient temperature, or vice versa.
4. A device (100) according to claim 3, wherein the first air flow is a minimum air flow and the second air flow is a maximum air flow.
5. A device (100) according to claim 3 or 4, wherein the bi-metal device (104) is configured to control the airflow guiding device (102) into one or more intermediate positions between the first position and the second position at corresponding one or more intermediate ambient temperatures between the first ambient temperature and the second ambient temperature.
6. A device (100) according to any one of claims 1 to 5, wherein the air flow guiding device (102) comprises one or more air flow guiding means (106).
7. A device (100) according to claim 6, wherein the one or more air flow guiding means (106) are any one from the group comprising: plates, flaps, discs, and sheets.
8. A device (100) according to any one of claims 1 to 7, wherein the bi-metal device (104) is coupled to the air flow guiding device (102) by means of a coupling means (108) extending along an axis of rotation (A).
9. A device (100) according to claim 8, wherein the coupling means (108) is any one from the group comprising: a rod, a shaft, a tube, and an axle.
10. A device (100) according to claim 8 or 9, wherein the one or more air flow guiding means (106) are attached along the coupling means (108), and wherein the bi-metal device (104) is configured to control the one or more air flow guiding means (106) by rotating the one or more air flow guiding means (106) around the axis of rotation (A).
11. A device (100) according to claim 10, wherein the one or more airflow guiding means (106) extend perpendicular to the axis of rotation (A).
12. A device (100) according to any one of claims 8 to 11 , wherein the bi-metal device (104) is attached at an end of the coupling means (108).
13. A device (100) according to any one of claims 1 to 12, wherein the bi-metal device (104) comprises a bi-metal spring.
14. A device (100) according to claim 13, wherein the bi-metal spring is a coil spring or a spiral spring.
15. A heat sink (300) for cooling an electrical component (200), the heat sink (300) comprising a device (100) for controlling an air flow for cooling an electrical component (200) according to any of claims 1 to 14.
16. A heat sink (300) according to claim 15, wherein the heat sink (300) further comprises one or more air channels (302), wherein each air channel (302) is configured to provide an air flow through the heat sink (300) for cooling the electrical component (200), and wherein the device (100) is configured to control the airflow through the one or more air channels (302).
17. A heat sink (300) according to claim 16, wherein the airflow guiding device (102) comprises one or more air flow guiding means (106), and wherein each one or more air flow guiding means (106) is configured to guide the air flow through one of the one or more air channels
(302).
18. A heat sink (300) according to claim 17, wherein the bi-metal device (104) is coupled to the one or more air flow guiding means (106) by means of a coupling means (108) extending along an axis of rotation (A) perpendicular to the one or more air channels (302).
19. A heat sink (300) according to claim 18, wherein the one or more air channels (302) are formed by one or more cooling fins extending perpendicular to the axis of rotation (A), and wherein the coupling means (108) extends through the one or more cooling fins.
20. A heat sink (300) according to any one of claims 15 to 19, wherein the bi-metal device (104) is arranged adjacent to the electrical component (200). 21. A heat sink (300) according to any one of claims 15 to 20, wherein the electrical component
(200) is a high power component.
PCT/EP2019/079482 2019-10-29 2019-10-29 A device for controlling an air flow for cooling an electrical component WO2021083493A1 (en)

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