Patent ID: 11955607
Assignee: KK WIND SOLUTIONS A/S
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B  G  Y | IPC H

Claim 16:
17. A method of determining state of charge of at least one energy module of a plurality of series connectable energy modules;
wherein the plurality of series connectable energy modules forms a string of energy modules;
wherein each of the energy modules are connected to the string via a plurality of switches configured in an H-bridge and located on a switch printed circuit board;
wherein a string controller is configured to control which of the energy modules that are part of a current path through the string by control of the status of a plurality of switches;, wherein the method of determining state of charge is performed by the string controller according to the following steps:
from a current sensor receive a value of measured current in the current path,
select at least one of the energy modules of the string,
determine a status of the switches controlling the at least one selected energy module,
determine the polarity of the current of the at least one selected energy module, and
establish the state of charge of the at least one selected energy module by performing an integration of the current of the at least one selected energy module.