Passively cooled solar concentrating photovoltaic device
First Claim
1. A concentrating photovoltaic (CPV) device comprising:
- a photovoltaic (PV) cell;
a solid, light-transparent optical element having a first side including a convex surface and a second side including a substantially flat aperture surface and a curved surface in a central portion of the second side, wherein the curved surface is smaller than the convex surface;
a primary mirror disposed on the convex surface and a secondary mirror disposed on the curved surface, the primary and secondary mirrors defining a focal region at which light received by the optical element is concentrated, wherein the PV cell is located in the focal region; and
a heat spreader in thermal contact with the optical element and having a central portion disposed over the center of the convex surface of the optical element and one or more peripheral portions extending from the central portion over the first side,wherein the heat spreader comprises a thermally conductive material that is in contact with and conformally disposed over a back surface of the primary mirror such that heat generated at the focal region is passively transmitted from the heat spreader through the primary mirror and the optical element for radiation from the substantially flat aperture surface.
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Accused Products
Abstract
A Cassegrain-type concentrating solar collector cell includes primary and secondary mirrors disposed on opposing convex and concave surfaces of a light-transparent (e.g., glass) optical element. Light enters an aperture surface surrounding the secondary mirror, and is reflected by the primary mirror toward the secondary mirror, which re-reflects the light onto a photovoltaic cell. The photovoltaic cell is mounted on a central portion of heat spreader that extends over the primary mirror. The heat spreader transmits waste heat from the photovoltaic cell in a manner that evenly distributes the heat over the optical element, thereby maximizing the radiation of heat from the aperture surface into space. The heat spreader includes a thick copper layer formed on a flexible substrate (e.g., polyimide film) that is patterned with radial arms that facilitate mounting onto the convex surface of the optical element.
185 Citations
17 Claims
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1. A concentrating photovoltaic (CPV) device comprising:
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a photovoltaic (PV) cell; a solid, light-transparent optical element having a first side including a convex surface and a second side including a substantially flat aperture surface and a curved surface in a central portion of the second side, wherein the curved surface is smaller than the convex surface; a primary mirror disposed on the convex surface and a secondary mirror disposed on the curved surface, the primary and secondary mirrors defining a focal region at which light received by the optical element is concentrated, wherein the PV cell is located in the focal region; and a heat spreader in thermal contact with the optical element and having a central portion disposed over the center of the convex surface of the optical element and one or more peripheral portions extending from the central portion over the first side, wherein the heat spreader comprises a thermally conductive material that is in contact with and conformally disposed over a back surface of the primary mirror such that heat generated at the focal region is passively transmitted from the heat spreader through the primary mirror and the optical element for radiation from the substantially flat aperture surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for producing a concentrating photovoltaic (CPV) device comprising:
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forming a solid, light-transparent optical element having a convex surface defining a first side, an opposing aperture surface and a curved surface defined in a central portion of the aperture surface; forming primary and secondary mirrors on the convex surface and curved surface, respectively, thereby defining a focal region at which light received by the optical element through the aperture surface is concentrated; forming a heat spreader by patterning a flexible flat sheet to include a central portion and multiple peripheral portions extending radially from the central portion; mounting a photovoltaic (PV) cell directly on the central portion of the heat spreader, wherein mounting the heat spreader on the optical element comprises disposing the PV cell proximate to the first side; and mounting the heat spreader onto the optical element such that the multiple peripheral portions are in contact with and conformally disposed over the primary mirror disposed on the convex surface such that heat generated at the focal region is passively transmitted from the heat spreader through the primary mirror and the optical element for radiation from the substantially flat aperture surface. - View Dependent Claims (17)
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Specification