Magnetostriction air pump
A magnetostriction based pump for cooling a power supply is provided. One exemplary embodiment of the invention utilizes one of the components that is already present in the power supply. The expense of the cooling system is minimized, as it is limited to a diaphragm and any channel routing. The airflow can be targeted at multiple devices by adding additional cooling channels or channeling the flow of air over multiple components.
Cross reference is made to the following commonly assigned U.S. patent applications filed herewith: U.S. Ser. No. TBD, entitled “MAGNETOSTRICTION AIDED SWITCHING.”
FIELD OF THE INVENTIONThe present invention is generally related to power supplies, and more specifically to heat reduction in power adapters and power converters.
BACKGROUND OF THE INVENTIONNotebook adapters, wall adapters, and car adapters all suffer from large power losses when voltage is converted from one form to another. The power that is not converted to a usable energy source is dissipated as heat to the environment. If a power supply maximum temperature was not regulated, the power supply could be made as small as part geometry would allow. However, due to guidelines by certification organizations such as Underwriters Laboratory (UL) and Technischer Überwachungsverein (TUV), the maximum temperature is usually limited to 85 degrees Celsius. In order to meet this limitation, the size of power supplies is typically increased in order to provide greater surface area for the dissipation of heat.
One way to reduce the size of the power supply is to use forced air-cooling/active cooling in which air is moved over the heat producing components in order to conduct the heat away from the main body of the power supply. The size can also be reduced by improving electrical efficiencies.
Prior active cooling solutions have used fans and diaphragm pumps. Fans can be positioned at one end of a power supply to push or pull air over the heated components. Diaphragm pumps use an electronically driven magnet to push and pull a diaphragm, moving air over a hot component or components, thus cooling in small bursts. The fan solution to active cooling is noisy, expensive, requires additional space, and has a short lifetime. Diaphragm pumps are expensive, large, draw ample amounts of energy/electricity and generally target only one hot component in a power supply.
SUMMARY OF INVENTIONThe present invention achieves technical advantages as a magnetostriction based air pump for cooling a power supply. One exemplary embodiment of the invention utilizes one of the components that is already present in the power supply. The expense of the cooling system is minimized, as it is limited to a diaphragm and any channel routing. The airflow can be targeted at multiple devices by adding additional cooling channels or channeling the flow of air over multiple components.
Referring to
Referring now to
When the switching MOSFET 24 opens, the ferromagnetic material 26 expands or contracts (depending on the sign of the coefficient of magnetostriction) up to the point of saturation, at which point any additional expansion or contraction of ferromagnetic material 26 is negligible. The expansion and contraction can be configured to create an air flow proximate to the heat generating components, such as by using diaphragms, channels, or other suitable materials. The construction of the magnetostrictive pump is not limited to a current transformer 22, but can be implemented with any suitable device that uses ferromagnetic material to conduct magnetic flux, including but not limited to motors, relays, magnetic latches, or other devices which can be constructed from ferromagnetic materials having large magnetostriction coefficients.
Referring now to
Though the invention has been described with respect to a specific preferred embodiment, many variations and modifications will become apparent to those skilled in the art upon reading the present application. It is therefore the intention that the appended claims be interpreted as broadly as possible in view of the prior art to include all such variations and modifications.
Claims
1. A magnetostriction pump comprising:
- a structure of magnetostrictive material configured to form a passageway containing a coolant;
- a magnetic field generator configured to create an alternating magnetic field in the structure of magnetostrictive material; and
- wherein the coolant is forced through the passageway by expansion and compression of the structure of magnetostrictive material when the magnetic field generator operates.
2. The magnetostriction pump of claim 1 further comprising a diaphragm disposed in the passageway.
3. The magnetostriction pump of claim 1 further comprising a tube coupled to the passageway.
4. The magnetostriction pump of claim 1 further comprising a valve coupled to the passageway.
5. The magnetostriction pump of claim 1 further comprising a tube coupled to the passageway.
6. The magnetostriction pump of claim 1 wherein the structure of magnetostrictive material further comprises:
- a circuit component having a magnetic flux conducting material; and
- a magnetic shunt of magnetostrictive material configured to be attached to the magnetic flux conducting material of the circuit component so as to form the passageway.
7. The magnetostriction pump of claim 1 wherein the coolant is air.
8. A method for pumping a fluid comprising:
- creating magnetic flux in a structure of magnetostrictive material, where the structure has a passageway;
- disposing a coolant in the passageway; and
- alternating the direction of the magnetic flux so as to cause the passageway to increase and decrease in volume due to magnetostrictive contraction and expansion, causing the coolant to flow in and out of the passageway.
9. The method of claim 8 further comprising causing the coolant to flow in one direction through the passageway.
10. The method of claim 8 wherein disposing the coolant in the passageway comprises disposing an air-filled diaphragm in the passageway.
11. The method of claim 8 wherein disposing the coolant in the passageway comprises disposing an air-filled diaphragm having a one-way valve on one end in the passageway.
12. The method of claim 8 further comprising directing the coolant onto an electrical component so as to provide cooling to the electrical component.
13. The method of claim 8 further comprising directing the coolant through tubing onto an electrical component so as to provide cooling to the electrical component.
14. The method of claim 8 further comprising directing the coolant through one or more channels onto an electrical component so as to provide cooling to the electrical component.
Type: Application
Filed: Oct 9, 2006
Publication Date: Apr 10, 2008
Inventors: Bryan Wayne McCoy (Scottsdale, AZ), Jason Walter Swanson (Tempe, AZ)
Application Number: 11/545,132
International Classification: F04B 17/00 (20060101);