Patent ID: 9225197
Filing Date: 2015-12-29
Classification: H02J,Y02B

Abstract:
1. An apparatus for charging an energy storage system (ESS) from an AC line having one of a first AC RMS line voltage and a second AC RMS line voltage greater than the first AC RMS line voltage, comprising: a boost stage converting the first or second AC RMS line voltage to an intermediate voltage greater than a peak voltage of the first or second AC RMS AC RMS line voltage, wherein said intermediate voltage is responsive to a boost control signal to set a magnitude of said intermediate voltage, wherein said intermediate voltage has one of a first intermediate magnitude and a second intermediate magnitude greater than said first intermediate magnitude; an isolation buck stage both converting said intermediate voltage to a secondary voltage and converting said secondary voltage to a charging voltage applied to the ESS, with said charging voltage greater than a charge voltage of the ESS, said isolation buck stage removing a common mode current between the ESS and said boost stage, said isolation buck stage including a first operational mode and a second operational mode, said operational modes responsive to an isolation control signal, wherein said operational modes scale said conversion of said intermediate voltage to said secondary voltage with said first operational mode providing a first scaling of said intermediate voltage different from a second scaling of said second operational mode; and a controller, coupled to said stages and providing said control signals responsive to a magnitude of the first or second AC RMS line voltage, wherein said boost stage produces said first intermediate magnitude from the first AC RMS line voltage and said isolation buck stage is configured for said first operational mode to convert said first intermediate voltage to said secondary voltage, and wherein said boost stage produces said second intermediate magnitude from the second AC RMS line voltage and said isolation buck stage is configured for said second operational mode to convert said second intermediate voltage to said secondary voltage.