Thermoelectric device with internal sensor
A thermoelectric system which comprises two substrates spaced apart from each other to form a gap and a plurality of electrically-connected semiconductor elements disposed between the substrates in the gap. The thermoelectric system further comprises at least one sensor and a seal which extends between the substrates and encloses the sensor and at least one of the plurality of semiconductor elements. The sensor is disposed between the substrates at an interior location spaced from the peripheral edge of at least one of the substrates. Additionally, at least one of the semiconductor elements is disposed between the sensor and the peripheral edge.
1. Field of the Invention
The present invention relates generally to thermoelectric devices and, more particularly, to a Peltier circuit.
2. Description of the Related Art
A Peltier circuit is a thermoelectric device comprising two sides. When voltage is applied in one direction, one side creates heat while the other side absorbs heat. Switching polarity of the circuit creates the opposite effect. In a typical arrangement, the Peltier circuit comprises a closed circuit that includes dissimilar materials. As a DC voltage is applied to the closed circuit, a temperature change is produced at the junction of the dissimilar materials. Heat is either emitted or absorbed at the junction depending on the direction of current flow. The Peltier circuit can include several such junctions connected electrically in series. The junctions can be sandwiched between two ceramic plates, which form the cold side and the hot side of the device. The cold side can be thermally coupled to an object to be cooled and the hot side can be thermally coupled to a heat sink which dissipates heat to the environment.
U.S. Patent Publication No. 2006-0130490 (filed Jan. 31, 2005 and published Jun. 22, 2006) discloses a vehicle seat ventilation system that utilizes a Peltier circuit to provide heated and/or cooled air to a vehicle seat for enhancing passenger comfort. Specifically, air can be passed over the cold and/or hot side of the Peltier circuit to heat or cool the air, which is then directed to the vehicle seat. Use of a Peltier circuit is particularly advantageous in this application because the Peltier circuit is compact and allows a single device to provide heated and cooled air to the vehicle seat. That is, the air may be directed over a single surface of the Peltier circuit, and the voltage can be reversed throughout the circuit depending on whether heated or cooled air is desired.
SUMMARY OF THE INVENTIONU.S. Patent Publication No. 2006-0130490 discloses a climate control system that can include a Peltier circuit for cooling and/or heating air supplied to a vehicle seat. A temperature sensor is used to measure the temperature of the air directed to the vehicle seat. Data from the temperature sensor can be used to control the amount and direction of voltage through the Peltier circuit. The temperature sensor should be reliable and provide accurate measurements. Accordingly, it would be desirable to provide a Peltier circuit with an improved arrangement for protecting the temperature sensor.
Accordingly, one aspect of the present invention comprises a thermoelectric device that includes a first and a second substrate spaced apart from each other to form a gap. A plurality of semiconductor elements are disposed between the first and second substrates within the gap. The plurality of semiconductor elements comprise a first group of semiconductor elements having a first set of electrical properties and a second group of semiconductor elements having a second set of electrical properties. A first set of electrical conductors is disposed between the plurality of semiconductors and the first substrate and a second set of electrical conductors are disposed between the plurality of semiconductors and the second substrate. The first set of electrical conductors and the second set of electrical conductors are arranged so the plurality of semiconductor elements are electrically coupled to each other in series with the first and second groups of semiconductor elements in an alternating arrangement. At least one sensor is disposed between the first and second substrates at a location spaced from a peripheral edge of the first and second substrates. A seal extends around the peripheral edge of the first and second substrates.
Another aspect of the present invention comprises a thermoelectric system that includes a pair of opposing substrates, each substrate having a peripheral edge and a face that generally opposes a face of the other opposing substrate. A plurality of semiconductor elements is positioned between the opposing faces. The plurality of semiconductor elements includes at least two dissimilar semiconductor elements, the plurality of semiconductor elements electrically coupled in series by conductor elements arranged so the two dissimilar elements are connected in an alternating pattern. A sensor is positioned between the pair of opposing substrates at a location spaced from the peripheral edges of the opposing substrates. A seal extends around the plurality of semiconductor elements
Another aspect of the present invention comprises a climate controlled seat assembly that includes a seat cushion having an outer surface comprising a first side for supporting an occupant in a sitting position and a second side. An air passage extends from the second side into the seat cushion and is configured to deliver air to the first side of the seat cushion. A climate control system is in fluid communication with the air passage. The climate control system includes a thermoelectric device configured to heat and cool air deliver to the air passage. The thermoelectric device includes a pair of opposing substrates. A plurality of semiconductor and connection elements are disposed between the opposing substrates. A sensor is disposed between the pair of opposing substrates. A seal extends around the plurality of semiconductor and connection elements and the sensor.
Yet another aspect of the present invention comprises a thermoelectric system that includes a pair of opposing substrates, each substrate having a peripheral edge and a face that generally opposes a face of the other opposing substrate. A plurality of semiconductor elements are disposed between the substrates elements. The plurality of semiconductor elements comprises at least two groups of dissimilar semiconductor elements that are alternately electrically coupled to each other in series. A sensor is positioned between the pair of opposing substrates at a location spaced from the peripheral edges of the opposing substrates. The system also includes means for sealing from moisture the plurality of semiconductor elements and the sensor positioned between the pair of opposing substrates.
With initial reference to
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With continued reference to
With continued reference to
As mentioned above, heat transfer assemblies 38 can be positioned on the top and bottom sides of the thermoelectric device 10. The thermoelectric device 10 is capable of operating without the heat transfer assemblies 38, however, the presence of such assemblies 38 increases the efficiency of heat transfer from the thermoelectric device 10 to the ambient atmosphere or a fluid in contact with the thermoelectric device 10.
With reference to
The substrates 32 are preferably configured to provide electrical insulation while providing for heat conduction. In one embodiment, the substrates 32 can be constructed of a ceramic material such as, for example, alumina (ceramic) or silicon. Various other types of materials may be used, such an epoxy. In such an embodiment, the substrates 32 are preferably sufficiently rigid to maintain the shape of the thermoelectric device 10. In other embodiments, flexible substrates can be used. When flexible substrates are used, the thermoelectric device can be constructed in various shapes and have the ability to bend from one shape to another. As mentioned above, the substrates 32 can act an electrical insulator. The typical thickness for a substrate can be between 50 and 500 micrometers, though other thicknesses can be used. In the illustrated embodiment, the substrates 32 can be sufficiently large to cover completely the semiconductor elements 22, 24 and conductor tabs 28. The conductor tabs 28 can be coupled to the electrically-insulating substrate 32 through solder, epoxy, or any other mounting mechanism.
With continued reference to
When a current is passed through the N-type semiconductor elements 22 in series with the P-type semiconductor elements 24, one junction 28 on one side of the semiconductor elements 22, 24 is heated and the junction 28 on the other side of the thermoelectric elements 22, 24 is cooled. That is, when a voltage is applied in one direction in series through the semiconductor elements 22, 24, alternating junctions 28 of the N-type semiconductor elements 22 and P-type semiconductor elements 24 will heat and cool respectively. With reference to
As described above, the sensor 50 can be disposed between the semiconductor elements 22, 24. The sensor 50 can be configured to determine any of a number of states of operation of the thermoelectric device 10. In the illustrated embodiment, the sensor 50 can be a temperature sensor, such as a thermistor. As an example, a thermistor with an internal resistance of about 1000Ω can be used. Other resistances and other sensors that detect different operating states of the device 10 can also be used, including, but not limited to, thermocouples and resistance thermometers. The sensor 50 can determine the temperature of the thermoelectric device 10 at a point located among the semiconductor elements 22, 24. The sensor 50 can be disposed on a conductor tab 28 (e.g., element 52) between an N-type semiconductor element 22 and a P-type semiconductor element 24, or can be disposed between any two conductor elements 22, 24 while mounted or placed on the substrate 32. In a modified embodiment, the sensor 50 can be disposed between a semiconductor element 22, 24 and the edge of the substrate 32.
With reference back to
The sensor 50 can have a wire 52 or other communication medium which extends through the seal 60. The seal 60 can be constructed of any material sufficient to inhibit moisture or other contaminants from entering the thermoelectric device 10. In some embodiments, the seal 60 can comprise putty. In other embodiments, plastics or epoxy can be used. In one particular embodiment, RTV, a commercially available silicone rubber sealant, can be used. In one embodiment, the seal 60 can extend completely around the perimeter of thermoelectric device 10 to completely enclose the thermoelectric elements 22, 24 and sensor 50 positioned between the substrate 32. In certain embodiments, the seal 60 can extend at least partially between the substrates 32 and in between the thermoelectric elements 22, 24.
With reference now to
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The seat assembly 100 can comprise a seat portion 102 and a back portion 104. The seat portion 102 and back portion 104 can each comprise a cushion 106a, 106b and a plurality of channels 108a, 108b disposed within and/or extending through the cushions 106a, 106b. Each of the channels 108a, 108b can be placed in fluid communication with the climate control system 99 through a conduit 10a, 10b. The conduits 10a, 10b, in turn, are in communication with separate climate control devices 112a, 112b. In the illustrated embodiment, the channels 108a associated with the seat portion 102 are in communication with a different climate control device 112a than the channels 108b in the back portion. However, in other embodiments, a single climate control device can be in fluid communication with the channels 108a, 108b the seat portion 102 and back portion 104. In other embodiments, multiple climate control devices can be associated with either the seat portion 102 and/or the back portion 104. In some embodiments, the channels 108a, 108b and/or conduits 110a, 110b can include resistive heating elements (not shown).
In the illustrated embodiment, the climate control devices 112a, 112b can each comprise the thermoelectric device 10a, 10b, which can be configured as described above, and a fluid transfer device 130a, 130b. The fluid transfer device 130a, 130b can be a radial or axial fan, or other device for transferring a fluid. The thermoelectric device 10a, 10b can be disposed between the fluid transfer device 130a, 130b and the conduits 110a, 110b. As described above, the thermoelectric device 10a, 10b can be configured to selectively heat or cool the fluid (e.g., air) delivered by the fluid transfer device 130a, 130b to the seat portion 102 and back portion 104. The fluid transfer device 130a, 130b can be configured to transfer air to the channels 108a, 108b that is drawn past only one side of the thermoelectric device 10a, 10b. Accordingly, the climate control devices 112a, 112b can be configured to alternately supply heated or cooled air 122a, 122b through the plurality of conduits 110a, 110b to the seat 100. The fluid transfer device 130a, 130b can also be used to withdraw air through the conduits 110a, 110b.
In the illustrated embodiments, each of the thermoelectric devices 10a, 10b include a pair of heat transfer members 38 (not shown in
The climate control devices 112a, 112b can be controlled and operatively connected by an electronic control device 114a, 114b. The electronic control devices 114a, 114b can receive signals from a plurality of input sources 116, 118, 120. In the illustrated embodiment, three input sources are shown, but more or fewer can be used. The electronic control devices 114a, 114b can be operatively connected with each other through an information connection 124. The electronic control devices 114a, 114b can be configured change the operating state of the climate control devices 112a, 112b in response to a control signal or setting. For example, the electronic control devices 114a, 114b can alter the speed at which fluid is transferred by the fluid transfer devices 130a, 130b or the operating state of the thermoelectric devices 10a, 10b to heat or cool the fluid. The sensor 50 (not shown in
With reference now to
The conductive material or elements 204 can be conductively coupled to the one side of the thermoelectric device 210 while the other side of the device 210 can be conductively coupled to a heat exchanger 212 positioned within a duct 206. A fluid transfer device 208 can be used to pump air through the heat exchanger 212. In this manner, the thermoelectric device 210 can be used to withdraw heat from the cup holder 203 or cavity 201 to cool a container or article positioned therein and/or transfer heat to the cup holder 203 or cavity 201 to heat a container positioned
Various components are described as being “operatively connected” to the control unit. It should be appreciated that this is a broad term that includes physical connections (e.g., electrical wires or hard wire circuits) and non-physical connections (e.g., radio or infrared signals). It should also be appreciated that “operatively connected” includes direct connections and indirect connections (e.g., through additional intermediate device(s)).
Although this invention has been disclosed in the context of certain preferred embodiments and examples, it will be understood by those skilled in the art that the present invention extends beyond the specifically disclosed embodiments to other alternative embodiments and/or uses of the invention and obvious modifications and equivalents thereof. In addition, while the number of variations of the invention have been shown and described in detail, other modifications, which are within the scope of this invention, will be readily apparent to those of skill in the art based upon this disclosure. It is also contemplated that various combinations or subcombinations of the specific features and aspects of the embodiments may be made and still fall within the scope of the invention. Accordingly, it should be understood that various features and aspects of the disclosed embodiments can be combined with, or substituted for, one another in order to perform varying modes of the disclosed invention. Thus, it is intended that the scope of the present invention herein disclosed should not be limited by the particular disclosed embodiments described above, but should be determined only by a fair reading of the claims.
Claims
1. A thermoelectric device comprising:
- a first and a second substrate spaced apart from each other to form a gap;
- a plurality of semiconductor elements disposed between the first and second substrates within the gap, the plurality of semiconductor elements comprising a first group of semiconductor elements having a first set of electrical properties and a second group of semiconductor elements having a second set of electrical properties;
- a first set of electrical conductors disposed between the plurality of semiconductors and the first substrate and a second set of electrical conductors disposed between the plurality of semiconductors and the second substrate, the first set of electrical conductors and the second set of electrical conductors arranged so the plurality of semiconductor elements are electrically coupled to each other in series with the first and second groups of semiconductor elements in an alternating arrangement;
- at least one sensor disposed between the first and second substrates at a location spaced from a peripheral edge of the first and second substrates; and
- a seal extending around the peripheral edge of the first and second substrates.
2. The thermoelectric system of claim 1, wherein the sensor is a temperature sensor.
3. The thermoelectric system of claim 1, wherein the sensor comprises a thermistor.
4. The thermoelectric system of claim 1, wherein the sensor comprises a thermocouple.
5. The thermoelectric system of claim 1, wherein the substrates have a substantially rectangular shape.
6. The thermoelectric system of claim 1, wherein the sensor is disposed, with respect to the peripheral edge, at substantially the center of one of the substrates
7. The thermoelectric system of claim 1, wherein the sensor is disposed between two of the plurality of semiconductor elements.
8. The thermoelectric system of claim 1, further comprising at least one heat transfer member coupled to at least one of the substrates.
9. The thermoelectric system of claim 8, wherein the heat transfer member comprises a plurality of fins.
10. The thermoelectric system of claim 1, wherein the seal completely encloses all of the plurality of semiconductor elements positioned between the substrates.
11. A thermoelectric system comprising:
- a pair of opposing substrates, each substrate having a peripheral edge and a face that generally opposes a face of the other opposing substrate;
- a plurality semiconductor elements are positioned between the opposing faces of the opposing substrates, the plurality of semiconductor elements comprises at least two groups of dissimilar semiconductor elements, the plurality of semiconductor elements electrically coupled in series by conductor elements arranged so the two groups of dissimilar semiconductor elements are connected in an alternating pattern;
- a sensor positioned between the pair of opposing substrates at a location spaced from the peripheral edges of the opposing substrates; and
- a seal extending around the plurality of semiconductor elements.
12. The thermoelectric system of claim 10, wherein the sensor is configured to detect temperature.
13. The thermoelectric system of claim 10, wherein the sensor comprises a thermistor.
14. The thermoelectric system of claim 10, wherein the sensor comprises a thermocouple.
15. The thermoelectric system of claim 10, wherein the seal is composed of silicone rubber.
16. The thermoelectric system of claim 10, wherein the substrates have a substantially rectangular shape.
17. A climate controlled seat assembly, comprising:
- a seat cushion having an outer surface comprising a first side for supporting an occupant in a sitting position and a second side;
- an air passage extending from the second side into the seat cushion and is configured to deliver air to the first side of the seat cushion;
- a climate control system in fluid communication with the air passage, the climate control system including a thermoelectric device configured to heat and cool air deliver to the air passage, the thermoelectric device including a pair of opposing substrates, a plurality of semiconductor and connection elements disposed between the opposing substrates, a sensor disposed between the pair of opposing substrates, and a seal extending around the plurality of semiconductor and connection elements and the sensor.
18. The thermoelectric system of claim 15, wherein the sensor is configured to detect temperature.
19. The thermoelectric system of claim 16, wherein the sensor comprises a thermistor.
20. The thermoelectric system of claim 15, wherein the thermoelectric device further comprises at least one heat transfer member coupled to one of the opposing substrates.
21. The thermoelectric system of claim 15, wherein the thermoelectric device further comprises at least one heat transfer member coupled to each of the opposing substrates.
22. A thermoelectric system comprising:
- a pair of opposing substrates, each substrate having a peripheral edge and a face that generally opposes a face of the other opposing substrate;
- a plurality semiconductor elements disposed between the opposing substrates, the plurality of semiconductor elements comprising at least two groups of dissimilar semiconductor elements that are alternately electrically coupled to each other in series;
- a sensor positioned between the pair of opposing substrates at a location spaced from the peripheral edges of the opposing substrates; and
- means for sealing from moisture the plurality of semiconductor elements and the sensor positioned between the pair of opposing substrates.
Type: Application
Filed: Oct 12, 2006
Publication Date: Apr 17, 2008
Inventors: Masa Inaba (Chino Hills, CA), Jay Christopher Clark (Arcadia, CA), Brian Comiskey (Coto De Caza, CA)
Application Number: 11/546,928
International Classification: H01L 35/28 (20060101); H05B 6/10 (20060101);