APPARATUS FOR OBTAINING INFORMATION ENABLING THE DETERMINATION OF THE MAXIMUM POWER POINT OF A POWER SOURCE

• US 20120139504A1
• Filed: 07/08/2010
• Published: 06/07/2012
• Est. Priority Date: 07/10/2009
• Status: Abandoned Application

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Buiatti, Gustavo
• Application Number:
  US13/382,758
• Publication Number:
  US 20120139504A1
• Time in Patent Office: Days
• US Class Current: 320/166
• CPC Class Codes: G05F 1/67 to the maximum power available from a generator, e.g. from solar cell

Abstract

An apparatus for determining information enabling determination of a maximum power point of a power source providing at a first time period a direct current, the apparatus including at least a capacitor, a mechanism for charging the capacitor during a second time period and for discharging the capacitor in a third time period, and a mechanism for monitoring voltage and current variations on the capacitor. During the first time period, the direct current does not go through the mechanism for charging the capacitor.

Claims

1-14. -14. (canceled)

15. An apparatus for determining information enabling determination of a maximum power point of a power source providing at a first time period a direct current, the apparatus comprising:

a capacitor;

means for charging the capacitor during a second time period and means for discharging the capacitor in a third time period;

means for monitoring the voltage and the current on the capacitor,

wherein, during the first time period, the direct current does not go through the means for charging the capacitor.

16. An apparatus according to claim 15, wherein the direct current is intended to a load during the first time period.

17. An apparatus according to claim 16, wherein the means for discharging the capacitor includes a resistor and a first switch, a first terminal of the resistor is connected to a first terminal of the power source and to a first terminal of the first switch, a second terminal of the resistor is connected to a first terminal of the capacitor, the second terminal of the capacitor is connected to a second terminal of the power source and to a second terminal of the first switch.

18. An apparatus according to claim 16, wherein the means for charging the capacitor during the second time period comprises a second switch.

19. An apparatus according to claim 18, wherein the second switch is connected in parallel with the resistor.

20. An apparatus according to claim 15, further comprising a third switch for disconnecting the load from the power source during the second and third time periods.

21. An apparatus according to claim 15, wherein the means for monitoring the voltage and the current on the capacitor samples the voltage on the capacitor at consecutive time samples during the second period of time.

22. An apparatus according to claim 15, wherein the means for monitoring the voltage and the current on the capacitor samples the current on the capacitor at consecutive time samples during the second period of time.

23. An apparatus according to claim 21, wherein the measured voltages at consecutive samples surrounding a given sample are processed using a fitted mathematical function which is obtained by minimizing the sum of the squares of the difference between the measured voltages at consecutive samples and mathematical functions to obtain a processed voltage for the given sample.

24. An apparatus according to claim 23, wherein the mathematical functions are polynomial functions of a given order with real coefficients.

25. An apparatus according to claim 24, wherein the current for the given sample is determined by multiplying the capacitance value of the capacitor by the derivative of the fitted mathematical function for the given sample.

26. An apparatus according to claim 24, further comprising means for sampling the voltage on the capacitor during the third time period to determine the capacitance value of the capacitor.

27. An apparatus according to claim 26, wherein the determined capacitance value is used for determining the current for the given sample.

28. An apparatus according to claim 20, wherein the capacitor, the means for monitoring the voltage and the current, and the third switch are components of a merged buck/boost converter.