Power pack charging from intermittent sources

1. A method for controlling a charging station, the method comprising:

monitoring a first power pack capacity of a first power pack connected to a charging station;

monitoring a second power pack capacity of a second power pack connected to the charging station;

configuring, in response to determining an energy harvesting device is producing energy and in response to determining that the first power pack capacity and the second power pack capacity are both below a respective threshold, the energy harvesting device to deliver charging current to a charging output of the charging station;

in response to determining that the energy harvesting device is producing energy and in response to determining that the first power pack capacity is below a first threshold and that the second power pack capacity is above a second threshold, configuring the energy harvesting device to deliver charging current to the first power pack and configuring the second power pack to deliver charging current to the charging output; and

in response to determining that the energy harvesting device is not producing energy and determining that the first power pack capacity is below the first threshold and that a second power pack capacity is above the second threshold, configuring the second power pack to deliver charging current to the charging output.

2. The method of claim 1 , wherein the first threshold equals the second threshold.

3. The method of claim 1 , further comprising:

configuring, in response to determining that the energy harvesting device is producing energy and in response to determining that the second power pack capacity is below the second threshold and that the first power pack capacity is above the first threshold, the energy harvesting device to deliver charging current to the second power pack and configuring the first power pack to deliver charging current to the charging output.

4. The method of claim 1 , further comprising:

configuring, in response to determining that the energy harvesting device is not producing energy and determining that the first power pack capacity is above the first threshold and that the second power pack capacity is below the second threshold, the first power pack to deliver charging current to the charging output.

5. The method of claim 1 , further comprising:

determining a present first power pack output voltage of the first power pack;

configuring, in response to determining the present first power pack output voltage of the first power pack and determining that the energy harvesting device is producing energy, an output voltage regulator connected to the energy harvesting device to produce the present first power pack output voltage; and

configuring, in response to determining the present first power pack output voltage of the first power pack and determining that the energy harvesting device is producing energy, the first power pack and the output voltage regulator to deliver, in parallel with one another, charging current to the charging output.

6. The method of claim 1 , wherein the energy harvesting device comprises an electrical generator powered by a renewable energy source.

7. The method of claim 1 , further comprising:

configuring, based on determining that the energy harvesting device is producing energy and in response to determining that the first power pack capacity is above a first threshold, a second buck-boost voltage regulator having an input coupled to the first power pack to produce a determined output voltage that is based on a charging output voltage delivered to the charging output; and

configuring, based on configuring the second buck-boost voltage regulator, a first buck-boost voltage regulator having an input coupled to the energy harvesting device, to produce the determined output voltage, wherein an output of the first buck-boost voltage regulator is coupled to an output of the second buck-boost voltage regulator.

8. The method of claim 5 ,

wherein the output voltage regulator connected to the energy harvesting device comprises a first buck-boost voltage regulator with a first electrical current input that is configured to receive electrical current from the energy harvesting device and that is electrically isolated from the first power pack,

wherein the first buck-boost voltage regulator has an electrical current output electrically coupled, independently of the first buck-boost voltage regulator, to an output of the first power pack, and

wherein configuring the output voltage regulator connected to the energy harvesting device to produce the present first power pack output voltage comprises configuring, based on determining the first power pack output voltage, the first buck-boost voltage regulator to produce an output at the first power pack output voltage.

9. A device charging station, comprising:

a power pack capacity monitor configured to monitor a first power pack capacity of a first power pack and to monitor a second power pack capacity of a second power pack;

a charging output connector configured to detachably connect to a rechargeable device;

a device charging controller, coupled to the power pack capacity monitor, configured to:

configure, in response to a determination that an energy harvesting device is producing energy and in response to a determination that the first power pack capacity and the second power pack capacity are both below a respective threshold, the energy harvesting device to deliver charging current to the charging output connector;

configure, in response to the determination that the energy harvesting device is producing energy and in response to a determination that the first power pack capacity is below a first threshold and that the second power pack capacity is above a second threshold, the energy harvesting device to deliver charging current to the first power pack and configuring the second power pack to deliver charging current to the charging output connector; and

configure, in response to a determination that the energy harvesting device is not producing energy and a determining that the first power pack capacity is below the first threshold and that the second power pack capacity is above the second threshold, the second power pack to deliver charging current to the charging output connector.

10. The device charging station of claim 9 , wherein the first threshold equals the second threshold.

11. The device charging station of claim 9 , the device charging controller further configured to configure, in response to a determination that the energy harvesting device is producing energy and in response to a determination that the second power pack capacity is below the second threshold and that the first power pack capacity is above the first threshold, the energy harvesting device to deliver charging current to the second power pack and configuring the first power pack to deliver charging current to the charging output connector.

12. The device charging station of claim 9 , the device charging controller further configured to configure, in response to a determination that the energy harvesting device is not producing energy and a determination that the first power pack capacity is above the first threshold and that the second power pack capacity is below the second threshold, the first power pack to deliver charging current to the charging output connector.

13. The device charging station of claim 9 , further comprising:

a power pack voltage monitor configured to determine a present output voltage value of the first power pack, and

wherein the device charging controller is coupled to the power pack voltage monitor, and the device charging controller is further configured to:

configure, in response to receiving the present output voltage value of the first power pack and in response to the determination that the energy harvesting device is producing energy, an output voltage regulator connected to the energy harvesting device to produce the present output voltage; and

configure, in response to receiving the present output voltage value of the first power pack and in response to the determination that the energy harvesting device is producing energy, the first power pack and the output voltage regulator to deliver, in parallel with one another, charging current to the charging output.

14. The device charging station of claim 9 , wherein the energy harvesting device comprises an electrical generator powered by a renewable energy source.

15. The device charging station of claim 14 , wherein the energy harvesting device comprises at least one of a solar cell and a wind powered electrical generator.

16. A computer program product for controlling a charging station, the computer program product comprising:

a computer readable storage medium having computer readable program code embodied therewith, the computer readable program code comprising instructions for:

monitoring a first power pack capacity of a first power pack connected to a charging station;

monitoring a second power pack capacity of a second power pack connected to the charging station;

configuring, in response to determining an energy harvesting device is producing energy and in response to determining that the first power pack capacity and the second power pack capacity are both below a respective threshold, the energy harvesting device to deliver charging current to a charging output of the charging station;

in response to determining that the energy harvesting device is producing energy and in response to determining that the first power pack capacity is below a first threshold and that the second power pack capacity is above a second threshold, configuring the energy harvesting device to deliver charging current to the first power pack and configuring the second power pack to deliver charging current to the charging output; and

in response to determining that the energy harvesting device is not producing energy and determining that the first power pack capacity is below the first threshold and that the second power pack capacity is above the second threshold, configuring the second power pack to deliver charging current to the charging output.

17. The computer program product of claim 16 , wherein the first threshold equals the second threshold.

18. The computer program product of claim 16 , further comprising:

configuring, in response to determining that the energy harvesting device is producing energy and in response to determining that the second power pack capacity is below the second threshold and that the first power pack capacity is above the first threshold, the energy harvesting device to deliver charging current to the second power pack and configuring the first power pack to deliver charging current to the charging output.

19. The computer program product of claim 16 , further comprising:

determining a present output voltage of the first power pack;

configuring, in response to determining the present output voltage of the first power pack and determining that the energy harvesting device is producing energy, an output voltage regulator connected to the energy harvesting device to produce the present output voltage; and

configuring, in response to determining the present output voltage of the first power pack and determining that the energy harvesting device is producing energy, the first power pack and the output voltage regulator to deliver, in parallel with one another, charging current to the charging output.

20. An electronic device, comprising:

an operational circuit;

a rechargeable power pack;

an energy harvesting device interface; and

a harvested energy storage and switching component, coupled to the energy harvesting device interface and the rechargeable power pack, comprising:

a power pack capacity monitor configured to monitor a first power pack capacity of a first power pack and to monitor a second power pack capacity of a second power pack, the first power pack and the second power pack being different from the rechargeable power pack;

a device charging controller, coupled to the power pack capacity monitor, configured to:

configure, in response to a determination that an energy harvesting device coupled to the energy harvesting device interface is producing energy and in response to a determination that the first power pack capacity and the second power pack capacity are both below a respective threshold, the energy harvesting device to deliver charging current to the rechargeable power pack;

configure, in response to the determination that the energy harvesting device is producing energy and in response to a determination that the first power pack capacity is below a first threshold and that the second power pack capacity is above a second threshold, the energy harvesting device to deliver charging current to the first power pack and configuring the second power pack to deliver charging current to the rechargeable power pack; and

configure, in response to a determination that the energy harvesting device is not producing energy and a determining that the first power pack capacity is below the first threshold and that the second power pack capacity is above the second threshold, the second power pack to deliver charging current to the rechargeable power pack.