Capacitor enhanced multi-element photovoltaic cell

• US 9,812,867 B2
• Filed: 06/12/2015
• Issued: 11/07/2017
• Est. Priority Date: 06/12/2015
• Status: Expired due to Fees

• Current Assignee: Black Knight Enterprises, Inc.
• Original Assignee: Black Knight Enterprises, Inc.
• Inventors: Johnson, Neldon P.
• Primary Examiner(s): Tran, Thienvu
• Assistant Examiner(s): Sun, Pinping
• Application Number:
  US14/738,138
• Publication Number:
  US 20160365730A1
• Time in Patent Office: 879 Days
• CPC Class Codes: H01L 31/043 Mechanically stacked PV cells
• CPC Class Codes: H02J 7/35 with light sensitive cells
• CPC Class Codes: H02S 40/38 Energy storage means, e.g. batteries, structurally associated with PV modules
• CPC Class Codes: Y02E 10/50 Photovoltaic [PV] energy
• CPC Class Codes: Y02E 10/56 Power conversion systems, e.g. maximum power point trackers
• CPC Class Codes: Y02E 70/30 Systems combining energy storage with energy generation of non-fossil origin

Abstract

A multi-element photovoltaic cell having two or more photovoltaic elements with an isolation layer interposed between all contiguous photovoltaic elements. Each photovoltaic element has an element front conductor and an element rear conductor which are in electrical contact with the photovoltaic layer of the photovoltaic element. The current from a respective photovoltaic element which is generated as incident solar radiation irradiates the photovoltaic cell, flows independently of the other photovoltaic elements to one or more capacitor banks controlled by a photovoltaic controller. The photovoltaic controller controls charging and discharging of element capacitors of the capacitor banks so as to optimize the efficiency of the photovoltaic cell.

Claims

1. A photovoltaic cell assembly comprising:

a plurality of photovoltaic elements, comprising at least a first photovoltaic element and a last photovoltaic element, each photovoltaic element comprising a photovoltaic layer and a pair of layer conductors, a layer front conductor and a layer rear conductor, the photovoltaic layer being interposed between the layer front conductor and the layer rear conductor, the layer front conductor and the layer rear conductor being in electrical contact with the photovoltaic layer, each photovoltaic layer having a layer bandgap which differs from the layer bandgap of the other photovoltaic layers, and each photovoltaic layer having a cell element anode and a cell element cathode;

one or more isolation layers, a respective isolation layer being interposed between contiguous photovoltaic elements;

a capacitor charge circuit electrically connected to each photovoltaic element;

a respective plurality of element capacitors electrically connected to each photovoltaic element by the capacitor charge circuit, each element capacitor having two capacitor electrodes, a capacitor cathode and a capacitor anode;

a respective plurality of capacitor charge switches electrically connected in the capacitor charge circuit to each photovoltaic element, a respective capacitor charge switch being electrically connected in the capacitor charge circuit between the cell element cathode and the capacitor cathode of a respective element capacitor, and another respective capacitor charge switch being electrically connected in the capacitor charge circuit between the cell element anode and the capacitor anode of the respective element capacitor,

a capacitor discharge circuit electrically connected to each element capacitor,

an output circuit electrically connected to the capacitor discharge circuit;

a respective plurality of capacitor discharge switches connected in the capacitor discharge circuit to each element capacitor, a respective capacitor discharge switch being electrically connected in the capacitor discharge circuit between the capacitor cathode of the respective element capacitor and the output circuit, and another respective capacitor discharge switch being electrically connected in the capacitor discharge circuit between the capacitor anode of the respective element capacitor and the output circuit;

a plurality of capacitor voltage sensors, each of the voltage sensors being electrically connected to the respective element capacitor, and

a photovoltaic controller in communication with the capacitor voltage sensors, the capacitor charge switches and the capacitor discharge switches, and providing for control of the capacitor charge switches and capacitor discharge switches.

2. The photovoltaic cell assembly recited in claim 1 wherein one or more of the layer rear conductors comprise a doped conduction zone in the respective photovoltaic layer.

3. The photovoltaic cell assembly recited in claim 1 wherein the photovoltaic controller has a capability for switching each element capacitor of a respective photovoltaic element between a parallel connection and a series connection with other element capacitors of the photovoltaic element in accordance with a control algorithm.

4. The photovoltaic cell assembly recited in claim 1 wherein the photovoltaic controller has a capability for switching each element capacitor of a respective photovoltaic element between a parallel connection and a series connection with other element capacitors of the photovoltaic element or element capacitors of one or more of the other photovoltaic elements in accordance with a control algorithm.

5. The photovoltaic cell assembly recited in claim 1 wherein each photovoltaic element has a capacitor bank incorporating the element capacitors of the photovoltaic element and the photovoltaic controller has a capacity for controlling the capacitor charge switches and the capacitor discharge switches and a capability for switching each capacitor bank between a parallel connection and a series connection with other capacitor banks in accordance with a control algorithm.

6. The photovoltaic cell assembly recited in claim 1 wherein the photovoltaic controller has a capability for switching each element capacitor between one or more parallel configurations and one or more series configurations with other element capacitors of respective photovoltaic elements in accordance with a control algorithm.

7. The photovoltaic cell assembly recited in claim 1 wherein the photovoltaic controller has a capability for providing a parallel connection or a series connection between respective element capacitors of one or more photovoltaic elements with element capacitors of other photovoltaic cell assemblies, in accordance with a control algorithm.

8. The photovoltaic cell assembly recited in claim 1 wherein the photovoltaic controller has a capability for switching one or more element capacitors of a photovoltaic element between one or more parallel configurations and one or more series configurations with one or more other element capacitors of the photovoltaic element, with one or more respective element capacitors of one or more other photovoltaic elements of the photovoltaic cell assembly, or with one or more respective element capacitors of one or more photovoltaic elements of one or more other cell element assemblies, in accordance with a control algorithm.

9. The photovoltaic controller recited in claim 1 further comprising a cell current sensor electrically connected to the capacitor charge circuit, the cell current sensor being in communication with the photovoltaic controller.

10. The photovoltaic controller recited in claim 1 wherein the photovoltaic controller incorporates a digital computer with a control algorithm.

11. A photovoltaic cell assembly comprising:

a plurality of photovoltaic elements, comprising at least a first photovoltaic element and a last photovoltaic element, each photovoltaic element comprising a photovoltaic layer and a pair of layer conductors, a layer front conductor and a layer rear conductor, the photovoltaic layer being interposed between the layer front conductor and the layer rear conductor, the layer front conductor and the layer rear conductor being in electrical contact with the photovoltaic layer, each photovoltaic layer having a layer bandgap which differs from the layer bandgap of the other photovoltaic layers, and each photovoltaic layer having a cell element anode and a cell element cathode;

one or more isolation layers, a respective isolation layer being interposed between contiguous photovoltaic elements;

a capacitor charge circuit electrically connected to each photovoltaic element;

a respective plurality of element capacitors electrically connected to each photovoltaic element by the capacitor charge circuit, each element capacitor having two capacitor electrodes, a capacitor cathode and a capacitor anode;

a respective plurality of capacitor charge switches electrically connected in the capacitor charge circuit to each photovoltaic element, a respective capacitor charge switch being electrically connected in the capacitor charge circuit between the cell element cathode and the capacitor cathode of a respective element capacitor, and another respective capacitor charge switch being electrically connected in the capacitor charge circuit between the cell element anode and the capacitor anode of the respective element capacitor,

a capacitor discharge circuit electrically connected to each element capacitor,

an output circuit electrically connected to the capacitor discharge circuit;

a respective plurality of capacitor discharge switches connected in the capacitor discharge circuit to each element capacitor, a respective capacitor discharge switch being electrically connected in the capacitor discharge circuit between the capacitor cathode of the respective element capacitor and the output circuit, and another respective capacitor discharge switch being electrically connected in the capacitor discharge circuit between the capacitor anode of the respective element capacitor and the output circuit;

a plurality of capacitor voltage sensors, each of the voltage sensors being electrically connected to the respective element capacitor, and

a photovoltaic controller in communication with the capacitor voltage sensors, the capacitor charge switches and the capacitor discharge switches, and having a capability for controlling the capacitor charge switches and the capacitor discharge switches in accordance with a control algorithm.

12. The photovoltaic cell assembly recited in claim 11 wherein one or more of the layer rear conductors comprise a doped conduction zone in the respective photovoltaic layer.

13. The photovoltaic cell assembly recited in claim 11 wherein the photovoltaic controller has a capability for switching one or more element capacitors between one or more parallel configurations and one or more series configurations with one or more other element capacitors of the respective photovoltaic elements in accordance with the control algorithm.

14. The photovoltaic cell assembly recited in claim 11 wherein the photovoltaic controller has a capability for switching one or more element capacitors of a respective photovoltaic element between a parallel connection and a series connection with one or more other element capacitors of the photovoltaic element in accordance with the control algorithm.

15. The photovoltaic cell assembly recited in claim 11 wherein the photovoltaic controller has a capability for switching each element capacitor of a respective photovoltaic element between a parallel connection and a series connection with other element capacitors of the photovoltaic element or element capacitors of one or more of the other photovoltaic elements in accordance with the control algorithm.

16. The photovoltaic cell assembly recited in claim 11 wherein each photovoltaic element has a capacitor bank incorporating the element capacitors of the photovoltaic element and a capability for switching each capacitor bank between a parallel connection and a series connection with other capacitor banks in accordance with the control algorithm.

17. The photovoltaic cell assembly recited in claim 11 wherein the photovoltaic controller has a capability for switching each element capacitor between one or more parallel configurations and one or more series configurations with other element capacitors of respective photovoltaic elements in accordance with the control algorithm.

18. The photovoltaic cell assembly recited in claim 11 wherein the photovoltaic controller has a capability for controlling the capacitor charge switches and the capacitor discharge switches and has a capability for providing a parallel connection or a series connection between respective element capacitors of one or more photovoltaic elements with element capacitors of other photovoltaic cell assemblies, in accordance with the control algorithm.

19. The photovoltaic cell assembly recited in claim 11 wherein the photovoltaic controller has a capability for switching one or more element capacitors of a photovoltaic element between one or more parallel configurations and one or more series configurations with one or more other element capacitors of the photovoltaic element, with one or more respective element capacitors of one or more other photovoltaic elements of the photovoltaic cell assembly, or with one or tore respective element capacitors of one or more photovoltaic elements of one or more other cell element assemblies, in accordance with the control algorithm.

20. The photovoltaic cell assembly recited in claim 11 wherein the photovoltaic controller has a capability for switching each element capacitor between one or more parallel configurations and one or more series configurations with other element capacitors of respective photovoltaic elements, respective element capacitors of respective photovoltaic elements of the photovoltaic cell assembly, or respective element capacitors of respective photovoltaic elements of respective cell element assemblies, in accordance with the control algorithm.

21. The photovoltaic controller recited in claim 11 further comprising a cell current sensor electrically connected to the capacitor charge circuit, the cell current sensor being in communication with the photovoltaic controller.

22. The photovoltaic controller recited in claim 11 wherein the photovoltaic controller incorporates a digital computer with a control algorithm.

23. A method for improving the output power production of a photovoltaic cell assembly of a plurality of photovoltaic elements, each photovoltaic element having a photovoltaic layer, an element anode and an element cathode, each photovoltaic layer having a layer bandgap which differs from the layer bandgap of the other photovoltaic layers, and each photovoltaic layer having a cell element anode and a cell element cathode the method comprising:

interposing a pair of layer conductors for each photovoltaic layer, a layer front conductor and a layer rear conductor, the photovoltaic layer being interposed between the layer front conductor and the layer rear conductor, the layer front conductor and the layer rear conductor being in electrical contact with the photovoltaic layer,

interposing one or more isolation layers, a respective isolation layer being interposed between contiguous photovoltaic elements;

connecting a respective plurality of element capacitors to each photovoltaic element by a capacitor charge circuit, each element capacitor having two capacitor electrodes, a capacitor cathode and a capacitor anode;

providing a respective plurality of capacitor charge switches for selectively charging the respective element capacitors of each photovoltaic layer, a respective capacitor charge switch being electrically connected in the capacitor charge circuit between the element cathode and the capacitor cathode of a respective element capacitor, and another respective capacitor charge switch being electrically connected in the capacitor charge circuit between the element anode and the capacitor anode of the respective element capacitor,

monitoring a capacitor voltage across each element capacitor using a plurality of voltage sensors, one of the respective voltage sensors being electrically connected to a respective element capacitor,

connecting the element capacitors to an output circuit by a capacitor discharge circuit;

providing a respective plurality of capacitor discharge switches for selectively discharging the respective element capacitors, a respective capacitor discharge switch being electrically connected in the capacitor discharge circuit between the capacitor cathode of the respective element capacitor and the output circuit, and another respective capacitor discharge switch being electrically connected in the capacitor discharge circuit between the capacitor anode of the respective element capacitor and the output circuit; and

using a photovoltaic controller in communication with the capacitor voltage sensors, the capacitor charge switches, and the capacitor discharge switches, to control an operation of the respective capacitor charge switches and an operation of the respective capacitor discharge switches, to optimize the power output of the photovoltaic array using the capacitor voltages measured by the voltage sensors.

24. The method recited in claim 23 further comprising measuring a current from each photovoltaic cell using a respective cell current sensor electrically connected to the capacitor charge circuit, each of the cell current sensors being in communication with the photovoltaic controller, and the photovoltaic controller using the measured current for each photovoltaic cell in controlling the operation of the capacitor charge switches and the operation of the capacitor discharge switches in optimizing the power output of the photovoltaic array.

25. The method recited in claim 23 wherein the photovoltaic controller incorporates a digital computer with a control algorithm.

26. The method recited in claim 23 wherein one or more of the layer rear conductors comprise a doped conduction zone in the respective photovoltaic layer.

27. The method recited in claim 23 wherein the photovoltaic controller is used to switch between a parallel connection and a series connection between respective element capacitors of respective photovoltaic elements in accordance with a control algorithm.

28. The method recited in claim 23 wherein the photovoltaic controller is used to switch each element capacitor between one or more parallel configurations and one or more series configurations with one or more other element capacitors of respective photovoltaic elements in accordance with a control algorithm.

29. The method recited in claim 23 wherein the photovoltaic controller is used to switch between a parallel connection and a series connection between respective element capacitors of respective photovoltaic elements, and to provide a parallel connection or a series connection between respective element capacitors of one or more photovoltaic elements of other photovoltaic cell assemblies, in accordance with a control algorithm.

30. The method recited in claim 23 wherein the photovoltaic controller is to switch between one or more parallel configurations and one or more series configurations of one or more element capacitors with one or more other element capacitors of the photovoltaic element, one or more element capacitors of one or more other photovoltaic elements of the photovoltaic cell assembly, or one or more element capacitors of one or more photovoltaic elements of one or more other photovoltaic cell assemblies, in accordance with a control algorithm.

31. A method for improving the output power production of a photovoltaic array of a plurality of photovoltaic cells, each photovoltaic cell comprising a plurality of photovoltaic elements, each photovoltaic element comprising a photovoltaic layer and a pair of layer conductors, a layer front conductor and a layer rear conductor, the photovoltaic layer being interposed between the layer front conductor and the layer rear conductor, the layer front conductor and the layer rear conductor being in electrical contact with the photovoltaic layer, each photovoltaic layer having a layer bandgap which differs from the layer bandgap of the other photovoltaic layers, and each photovoltaic layer having a cell element anode and a cell element cathode, the method comprising:

interposing a pair of layer conductors for each photovoltaic layer, a layer front conductor and a layer rear conductor, the photovoltaic layer being interposed between the layer front conductor and the layer rear conductor, the layer front conductor and the layer rear conductor being in electrical contact with the photovoltaic layer;

interposing one or more isolation layers, a respective isolation layer being interposed between contiguous photovoltaic elements;

providing a capacitor bank comprised of a plurality of element capacitors and connecting each photovoltaic element of each photovoltaic cell to the capacitor bank by a capacitor charge circuit, each element capacitor having two capacitor electrodes, a capacitor cathode and a capacitor anode;

providing a plurality of capacitor charge switches for selectively connecting the photovoltaic elements of each photovoltaic cell to the element capacitors through the capacitor charge circuit, and selectively charging the element capacitors from the photovoltaic elements;

monitoring a capacitor voltage across each element capacitor using a plurality of voltage sensors, one of the respective voltage sensors being electrically connected to a respective element capacitor,

connecting the element capacitors of each photovoltaic to an output circuit by a capacitor discharge circuit;

providing a plurality of capacitor discharge switches electrically connected in the capacitor discharge circuit for selectively connecting the element capacitors to the output circuit and selectively discharging the element capacitors to the output circuit; and

using a photovoltaic controller in communication with the capacitor voltage sensors, the capacitor charge switches, and the capacitor discharge switches, to control an operation of the respective capacitor charge switches and an operation of the respective capacitor discharge switches using the capacitor voltages measured by the voltage sensors, to improve the power output of the photovoltaic array.

32. The method recited in claim 31 further comprising measuring a current from each photovoltaic cell using a respective cell current sensor electrically connected to the capacitor charge circuit, each of the cell current sensors being in communication with the photovoltaic controller, and the photovoltaic controller using the measured current for each photovoltaic cell in controlling the operation of the capacitor charge switches and the operation of the capacitor discharge switches in improving the power output of the photovoltaic array.

33. The method recited in claim 31 wherein the photovoltaic controller incorporates a digital computer with a control algorithm.

34. The method recited in claim 31 wherein one or more of the layer rear conductors comprise a doped conduction zone in the respective photovoltaic layer.

35. The method recited in claim 31 wherein the photovoltaic controller is used to control the capacitor charge switches and the capacitor discharge switches and is used to switch between a parallel connection and a series connection between respective element capacitors in accordance with a control algorithm.

36. The method recited in claim 31 wherein the photovoltaic controller is used to control the capacitor charge switches and the capacitor discharge switches and is used to switch each element capacitor between one or more parallel configurations and one or more series configurations with other element capacitors in accordance with a control algorithm.