Back to results
US 11,909,246 B2Granted
Method and system for an AC battery
AssigneeEnphase Energy, Inc.
InventorsMartin Fornage, Mauricio Cespedes Moya
Life of this patent
Estimating the term…
Abstract
A method and system for AC battery operation. In one embodiment, the method comprises determining, at a battery management unit (BMU) coupled to an AC battery comprising a power converter and a battery that is rechargeable, a bias control voltage that indicates a state of a charge process of the AC battery; and coupling, by a bias control module of the BMU, the bias control voltage to the power converting for communicating the state of the charge process to and from the BMU and the power converter.
Claims12
A method for AC battery operation, comprising:
- determining, at a battery management unit (BMU) coupled to an AC battery system comprising a power converter and a battery that is rechargeable, an equivalent series resistance estimation by correlating a ripple voltage and a ripple current, which exists on a DC battery during power conversion, at twice a line frequency, the equivalent series resistance estimation indicates a state of a charge (SOC) process of the AC battery system;
- coupling, by a bias control module of the BMU, the equivalent series resistance estimation to the power converter for communicating, without a control area network, at least one of a state of health (SoH) of the battery or a degradation of the battery to and from the BMU and the power converter;
- when one of a battery voltage reaches a high or low end of battery operation or a high or low end of estimated state of charge (SOC) of the battery, reducing a current when an estimated ESR increases;
- determining, at each of the BMU and the power converter, a bias control voltage and SOC values;
- and
- periodically synchronizing estimated SOC values with one another.
3 more elements
An AC battery system, comprising:
- a battery that is rechargeable;
- a battery management unit (BMU) coupled to the battery and configured to provide an equivalent series resistance estimation by correlating a ripple voltage and a ripple current, which exists on a DC battery during power conversion, at twice a line frequency, the equivalent series resistance estimation indicates a state of a charge (SOC) process of the AC battery system;
- and
- a power converter coupled to the battery and the BMU for communicating, without a control area network, at least one of a state of health (SoH) of the battery or a degradation of the battery to and from the BMU and the power converter;
- when one of a battery voltage reaches a high or low end of battery operation or a high or low end of estimated state of charge (SOC) of the battery, reducing a current when an estimated ESR increases;
- determining, at each of the BMU and the power converter, a bias control voltage and SOC values;
- and
- periodically synchronizing estimated SOC values with one another.
5 more elements
Dependencies are inferred from the claim text.