Self-powered systems and methods using auxiliary solar cells

• US 20070102037A1
• Filed: 10/04/2006
• Published: 05/10/2007
• Est. Priority Date: 10/04/2005
• Status: Abandoned Application

• Current Assignee: Soliant Energy, Inc. (Emcore Corporation)
• Original Assignee: Soliant Energy, Inc. (Emcore Corporation)
• Inventors: Irwin, Philip
• Application Number:
  US11/543,268
• Publication Number:
  US 20070102037A1
• Time in Patent Office: Days
• US Class Current: 136/246
• CPC Class Codes: F24S 25/00 Arrangement of stationary mountings or supports for solar heat collector modules
• CPC Class Codes: F24S 30/40 for rotary movement
• CPC Class Codes: H01L 31/044 including bypass diodes bypass diodes in the junction box H02S40/34
• CPC Class Codes: H01L 31/0547 comprising light concentrating means of the reflecting type, e.g. parabolic mirrors, concentrators using total internal reflection
• CPC Class Codes: H02S 20/32 specially adapted for solar tracking
• CPC Class Codes: Y02E 10/47 Mountings or tracking
• CPC Class Codes: Y02E 10/52 PV systems with concentrators

Abstract

The present invention relates to technology for providing independent electrical power to a wide variety of electronic and/or mechanical systems, especially systems incorporating sensors and corresponding components that are used to take action based upon sensed information.

Claims

1. A photovoltaic power system, comprising:

a) a component that articulates and tracks the sun; and

b) a source of electrical power comprising;

1) a first, fixed photovoltaic solar cell having a face oriented in a first direction;

2) a second, fixed, photovoltaic solar cell having a face oriented in a second direction, wherein the second direction is different from the first direction;

wherein the source of electrical power is electrically coupled to the component in a manner effective such that light that is incident upon one or more of said faces is converted into an electrical output used to provide power to articulate the component.

2. The system of claim 1, wherein the first and second solar cells are fixed to a stationary frame, said frame further supporting a photovoltaic concentrator module that articulates to track the sun, wherein the first and second solar cells provide a source of electrical energy that powers articulation of the photovoltaic concentrator module.

3. The system of claim 1, wherein the first solar cell constitutes a cell in a first string of solar cells having respective faces oriented in the first direction, and wherein the second solar cell constitutes a cell in a second string of solar cells have respective faces oriented in the second direction.

4. The system of claim 3, wherein the solar cells of the first string are electrically coupled in a first series and the solar cells of the second string are electrically coupled in a second series, said first and second series being electrically coupled in parallel.

5. The system of claim 3, wherein a bypass diode is electrically coupled in parallel to at least one solar cell of the first string in a manner effective to help maintain a power output when said at least one solar cell of the first string is shaded.

6. The system of claim 3, wherein each cell of the first string is associated with a corresponding bypass diode.

7. The system of claim 3, wherein a group of cells of the first string is associated with a corresponding bypass diode.

8. The system of claim 3, wherein at least one solar cell of the first string is electrically coupled to the first string in a manner effective to help maintain a power output when said at least one solar cell of the first string is shaded.

9. The system of claim 3, wherein the first and second strings are fixed to a generally planar, fixed frame with faces oriented outward to capture incident sunlight.

10. The system of claim 8, wherein the first string is supported upon a wedge in a manner to orient the string outward from the frame.

11. A photovoltaic power system comprising:

a) an articulating, photovoltaic concentrator module supported upon a frame, said module providing an electrical power output from the system; and

b) a plurality of fixed, photovoltaic cells coupled to the system in a manner effective to provide electrical power internally to one or more components of the power system, said cells being positioned at a plurality of locations and being oriented in a plurality of directions in a manner effective to capture incident sunlight as the sun moves.

12. The system of claim 11, wherein the frame is fixed and the cells are affixed to the frame.

13. The system of claim 11, wherein the frame is rectilinear and has a long axis, and wherein the frame is installed so that the long axis presents itself to the east and west.

14. The system of claim 12, wherein a cell affixed to the frame has a face that is tilted with respect to the frame.

15. The system of claim 11, wherein a first solar cell constitutes a cell in a first string of solar cells having respective faces oriented in a first direction, and wherein a second solar cell constitutes a cell in a second string of solar cells have respective faces oriented in a second direction.

16. The system of claim 15, wherein the system comprises at least four strings of solar cells, wherein said strings have faces tilted toward the east, west, south, and north, respectively.

17. The system of claim 15, wherein the cells of the first string are electrically coupled in series, the cells of the second string are electrically coupled in series, and the first and second strings are electrically coupled in parallel.

18. The system of claim 15, wherein a bypass diode is electrically coupled in parallel to at least one solar cell of the first string in a manner effective to help maintain a power output when said at least one solar cell of the first string is shaded.

19. The system of claim 18, wherein each cell of the first string is associated with a corresponding bypass diode.

20. The system of claim 18, wherein a group of cells of the first string is associated with a corresponding bypass diode.

21. The system of claim 15, wherein at least one solar cell of the first string is electrically coupled to the first string in a manner effective to help maintain a power output when said at least one solar cell of the first string is shaded.

22. A method of providing electrical power to a system, comprising the steps of:

a) providing a plurality of fixed solar cells mounted on the system and oriented in a plurality of directions to capture incident sunlight as the sun moves, said cells converting the incident sunlight into electrical power;

b) causing the fixed solar cells to be electrically coupled to at least one component of the system that uses electrical power; and

c) causing the electrical component to use the electrical power provided by the fixed cells.

23. The method of claim 22, wherein the electrical component uses the electrical power to articulate a solar concentrator module supported upon a fixed frame.

24. The method of claim 22, wherein the electrical component comprises a sensor and the component uses the electrical power to sense the direction of incident sunlight and the system uses the sensed information to cause a solar concentrator module to articulate and track the sun.

25. A method of providing electrical power, comprising the steps of:

a) causing a plurality of fixed solar cells affixed to a photovoltaic power system to provide electrical power for internal use by the photovoltaic power system, said fixed solar cells being oriented in a plurality of directions to capture incident sunlight as the sun moves; and

b) causing a plurality of articulating solar cells of the power system to provide electrical power for a use external to the system.

26. A photovoltaic power system comprising a photovoltaic cell provided on a fixed wedge, wherein the photovoltaic cell is electrically coupled to an articulating component of the photovoltaic power system.

27. A photovoltaic power system, comprising:

a) a plurality of individually moveable photovoltaic concentrator modules or module groups, wherein each concentrator module of the plurality includes;

i) at least one photovoltaic cell physically coupled to the module; and

ii) a solar concentrator that helps to concentrate incident light upon at least one corresponding photovoltaic cell;

b) a self-powered tracking system being electrically coupled the photovoltaic power system, wherein the self-powered tracking system comprises one or more fixed and tilted photovoltaic cells that capture incident light and convert it to an electrical power output, wherein the self-powered tracking system photovoltaic cells are separate from the photovoltaic cells of the concentrator modules;

c) at least one sensor that uses the electrical power output to generate information indicative of a sensed position of a light source;

d) actuating componentry that uses the electrical power output to move the photovoltaic concentrator modules in a range of motion including one or more desired photovoltaic concentrator module positions; and

e) a control system that uses the electrical power output and the sensed information to cause the actuating componentry to move the photovoltaic concentrator modules to one or more desired positions.

28. A system comprising at least one sub-system that performs one or more functions using electrical power, said sub-system being electrically coupled to at least one fixed, tilted photovoltaic cell string, wherein the cell string comprises at least one photovoltaic cell.

29. The system of claim 28, wherein the one or more functions are selected from the group consisting of:

a self-powered tracking system, a self-powered telemetry system, a self-powered control system, a security system, a self-powered time estimation system, and combinations thereof.