Solar module system and method using transistors for bypass

• US 20090014050A1
• Filed: 07/13/2007
• Published: 01/15/2009
• Est. Priority Date: 07/13/2007
• Status: Abandoned Application

• Current Assignee: Semiconductor Components Industries LLC (ON Semiconductor Corporation)
• Original Assignee: Semiconductor Components Industries LLC (ON Semiconductor Corporation)
• Inventors: Haaf, Peter
• Application Number:
  US11/827,755
• Publication Number:
  US 20090014050A1
• Time in Patent Office: Days
• US Class Current: 136/244
• CPC Class Codes: H01L 31/02021 for solar cells electrical connection means, e.g. junction boxes, specially adapted for structural association with photovoltaic modules H02S40/34
• CPC Class Codes: Y02E 10/50 Photovoltaic [PV] energy

Abstract

In one embodiment, a bypass component is provided for use with a string of solar cells. Each solar cell is operable to generate power in response to light. A current may flow through all of the solar cells of the string to deliver the power generated by the solar cells of the string out to a load. The bypass component provides a bypass route for the string of solar cells in the event that at least one solar cell of the string is not generating power. The bypass component includes at least two transistors connected in series with each other and in parallel with the string of solar cells, each transistor having a control terminal. Control logic for the bypass component provides a control signal to the control terminal of each of the at least two transistors. The control signal turns on the at least two transistors so that current flows through the at least two transistors, thereby bypassing the string of solar cells, when at least one solar cell of the string is not generating power.

Claims

1. A solar module system comprising:

a plurality of solar cells, each solar cell operable to generate power in response to light, the plurality of solar cells arranged in strings, each string of solar cells comprising at least two solar cells connected in series, wherein a current may flow through all of the strings of solar cells to deliver the power generated by the solar cells of each string to a load; and

a plurality of bypass components, wherein a separate bypass component is provided for each string of solar cells, each bypass component operable to provide a bypass route for the respective string of solar cells in the event that at least one solar cell of the respective string is not generating power;

wherein each bypass component comprises;

at least two transistors connected in series with each other and in parallel with the respective string of solar cells, each transistor have a control terminal;

control logic for providing a control signal to the control terminal of each of the at least two transistors, the control signal for turning on the at least two transistors so that current flows through the at least two transistors, thereby bypassing the respective string of solar cells, when at least one solar cell of the respective string is not generating power.

2. The solar module system of claim 1, wherein each bypass component has at least two terminals for connection into the solar module system, the first terminal connected at one end of the respective string of solar cells, the second terminal connected at the other end of the respective string of solar cells.

3. The solar module system of claim 2, wherein each bypass component is implemented without a printed circuit board.

4. The solar module system of claim 1, wherein each bypass component is contained in a single semiconductor package.

5. The solar module system of claim 4, wherein each semiconductor package has at most two terminals for connection into the solar module system.

6. The solar module system of claim 1, wherein each bypass component comprises a power element for internally providing power to drive the at least two transistors.

7. The solar module system of claim 1, wherein each bypass component comprises one of a charge pump, an inverter circuit, a buck-boost circuit, or a CUK converter for providing a high voltage to drive the at least two transistors.

8. The solar module system of claim 7, wherein each bypass component is contained in a single semiconductor package.

9. The solar module system of claim 1, wherein each bypass component comprises a power element for providing a high voltage to drive the at least two transistors, wherein the power element comprises an inductor.

10. The solar module system of claim 9, wherein the inductor is implemented with bonding wire.

11. The solar module system of claim 10, wherein each bypass component is contained in a single semiconductor package.

12. The solar module system of claim 7, wherein each bypass component is implemented in an integrated circuit device.

13. The solar module system of claim 1, wherein the control signal provided to the control terminal of each of the at least two transistors prevents each of the at least two transistors from operating in linear mode.

14. The solar module system of claim 1, wherein the at least one solar cell of the respective string is not generating power because the at least one solar cell is covered.

15. The solar module system of claim 1, wherein each bypass component is implemented without a printed circuit board.

16. A bypass component for use with a string of solar cells, each solar cell operable to generate power in response to light, wherein a current may flow through all of the solar cells of the string to deliver the power generated by the solar cells of the string out to a load, the bypass component for providing a bypass route for the string of solar cells in the event that at least one solar cell of the string is not generating power, the bypass component comprising:

at least two transistors connected in series with each other and in parallel with the string of solar cells, each transistor have a control terminal; and

control logic for providing a control signal to the control terminal of each of the at least two transistors, the control signal for turning on the at least two transistors so that current flows through the at least two transistors, thereby bypassing the string of solar cells, when at least one solar cell of the string is not generating power.

17. The bypass component of claim 16, comprising:

a first terminal for connection at one end of the string of solar cells; and

a second terminal for connection at the other end of the string of solar cells.

18. The bypass component of claim 16, wherein the bypass component is implemented without a printed circuit board.

19. The bypass component of claim 16, wherein the bypass component is contained in a single semiconductor package.

20. The bypass component of claim 19, wherein the semiconductor package has at most two external terminals.

21. The bypass component of claim 16, comprising a power element for internally providing power to drive the at least two transistors.

22. The bypass component of claim 16, comprising one of a charge pump, an inverter circuit, a buck-boost circuit, or a CUK converter for providing a high voltage to drive the at least two transistors.

23. The bypass component of claim 22, wherein the bypass component is contained in a single semiconductor package.

24. The bypass component of claim 22, wherein the bypass component is implemented in an integrated circuit device.

25. The bypass component of claim 16, comprising a power element for providing a high voltage to drive the at least two transistors, the power element having an inductor.

26. The bypass component of claim 25, wherein the inductor is implemented with bonding wire.

27. The bypass component of claim 26, wherein the bypass component is contained in a single semiconductor package.

28. The bypass component of claim 16, wherein the control signal provided to the control terminal of each of the at least two transistors prevents each of the at least two transistors from operating in linear mode.

29. The bypass component of claim 16, wherein the bypass component is implemented without a printed circuit board.