Method for determining a capacitance of a capacitor, capacitor monitoring device and system
AssigneeSkeleton Technologies AG
InventorBertram Schemel
Life of this patent
Estimating the term…
Abstract
A method for determining a capacitance of a capacitor includes measuring an electrical current supplied from or to the capacitor over time, integrating the electrical current to determine a charge amount supplied from or to the capacitor over time, determining a state of charge, SoC, of the capacitor over time, determining a total charge capacity of the capacitor based on a linear relationship between changes in the charge amount and changes in the SoC, and determining the capacitance based on the calculated total charge capacity.
Claims20
A method for monitoring a capacitance of a capacitor, the method comprising:
- measuring an electrical current supplied from or to the capacitor over time indicated by a plurality of measurement results;
- integrating the electrical current to determine a charge amount supplied from or to the capacitor over time indicated by a plurality of integration results;
- determining a state of charge (SoC) of the capacitor over time indicated by a plurality of determination results;
- determining a total charge capacity of the capacitor based on a linear relationship between changes in the charge amount and changes in the SoC, wherein the total charge capacity indicates a maximum amount of electric charge that can be stored by the capacitor;
- determining the capacitance based on the calculated total charge capacity and an open-circuit voltage of the capacitor when fully charged;
- and
- outputting the determined capacitance.
A capacitor monitoring device for monitoring the capacitance of a capacitor, the capacitor monitoring device comprising:
- a current sensor configured to measure an electrical current supplied from or to the capacitor over time;
- a voltage sensor configured to measure a terminal voltage of the capacitor over time;
- a capacitance determination unit configured to measure an electrical current supplied from or to the capacitor over time indicated by a plurality of measurement results, integrate the electrical current to determine a charge amount supplied from or to the capacitor over time indicated by a plurality of integration results, determine a state of charge (SoC) of the capacitor over time indicated by a plurality of determination results, determine a total charge capacity of the capacitor based on a linear relationship between changes in the charge amount and changes in the SoC, wherein the total charge capacity indicates a maximum amount of electric charge that can be stored by the capacitor, and determine the capacitance based on the calculated total charge capacity and an open-circuit voltage of the capacitor when fully charged;
- and
- an output unit configured to output the determined capacitance.
Dependencies are inferred from the claim text.