Method and system for connecting solar cells or slices in a panel system
A method and system include a plurality of solar cells and a plurality of voltage controllers. Each of the plurality of solar cells is directly coupled to a dedicated one of the plurality of voltage controllers to form unique pairs of solar cells and voltage controllers. Each of a plurality of panels contain a plurality of unique pairs.
1. A solar panel, comprising:
a plurality of solar cells; and
a plurality of voltage controllers, wherein each of the plurality of voltage controllers is directly coupled to a different one of the plurality of solar cells;
wherein each respective voltage controller comprises:
a single chip regulator having a buck converter, an input terminal, and an output terminal;
a capacitor connected to the output terminal of the single chip regulator;
a diode connected to the output terminal of the single chip regulator; and
a second capacitor configured to bootstrap the single chip regulator;
wherein the single chip regulator comprises:
a first transistor connected in parallel with one or more of the plurality of solar cells; and
a second diode connected in series with the capacitor, wherein a series connection from the second diode to the capacitor is connected in parallel with the first transistor and the one or more of the plurality of solar cells.
2. The solar panel of claim 1 , further comprising:
a second transistor connected to the single chip regulator as a controllable switch.
3. The solar panel of claim 2 , wherein the single chip regulator includes:
a first drive connection coupled to the first transistor and configured to control bucking operations of the first transistor; and
a second drive connection coupled to the second transistor and configured to control synchronous rectification operations of the second transistor.
4. The solar panel of claim 3 , wherein the plurality of solar cells further comprises a voltage divider connected in parallel with the capacitor; and the single chip regulator includes a feedback pin coupled to the voltage divider.
5. The solar panel of claim 3 , wherein the second capacitor is configured to bootstrap the single chip regulator before bucking operations of the first transistor.
6. The solar panel of claim 3 , wherein the single chip regulator includes a sense pin coupled to a connection point of the second transistor, the first transistor and the diode.
7. The solar panel of claim 6 , wherein the sense pin is configured to sense how much current is delivered during a certain predetermined phase of the second transistor.
8. The solar panel of claim 7 , wherein the sense pin is configured to sense how much current is delivered during an “on” phase of the second transistor.
9. A solar panel, comprising:
a panel having a front side;
an array of solar cells mounted on the front side of the panel;
a voltage controller directly coupled to each solar cell of the array of solar cells; and
an array of single chip regulators connected to the array of solar cells;
wherein each single chip regulator of the array of single chip regulators comprises:
a buck converter;
an input connected to receive power from a respective pair of solar cells in the array of solar cells; and
an output to provide the power generated by the respective pair of solar cells;
wherein the solar panel further comprises:
a respective capacitor connected to the output of a respective single chip regulator of the array of single chip regulators;
a respective diode connected to the output of the respective single chip regulator of the array of single chip regulators; and
the respective capacitor configured to bootstrap the respective single chip regulator of the array of single chip regulators;
wherein the single chip regulator comprises:
a respective first transistor connected in parallel with the array of solar cells; and
a respective second diode connected in series with the respective capacitor, wherein a series connection from the second diode to the respective capacitor is connected in parallel with the respective first transistor and the array of solar cells.
10. The solar panel of claim 9 , wherein the output of the respective single chip regulator of the array of single chip regulators is configured as a voltage source; and outputs of the single chip regulators are connected in parallel as an output of the solar panel.
11. The solar panel of claim 9 , wherein the output of the respective single chip regulator of the array of single chip regulators is configured as a current source; and outputs of the single chip regulators are connected in series as an output of the solar panel.
12. The solar panel of claim 9 , further comprising:
a respective second transistor connected to the respective single chip regulator of the array of single chip regulators as a controllable switch.
13. The solar panel of claim 12 , further comprising:
a respective first drive connection coupled to the respective first transistor and configured to control bucking operations of the respective first transistor; and
a respective second drive connection coupled to the respective second transistor and configured to control synchronous rectification operations of the respective second transistor.
14. The solar panel of claim 13 , further comprising:
a respective voltage divider connected in parallel with a respective capacitor; and
a respective feedback pin coupled to the respective voltage divider.
15. The solar panel of claim 13 , wherein the respective capacitor is configured to bootstrap the respective single chip regulator of the array of single chip regulators before bucking operations of the respective first transistor.
16. The solar panel of claim 13 , further comprising a respective sense pin coupled to a connection point of the respective second transistor, the respective first transistor and the respective diode.
17. The solar panel of claim 16 , wherein the respective sense pin is configured to sense how much current is delivered during a certain predetermined phase of the respective second transistor.