Patent ID: 11873109
Assignee: ROLLS-ROYCE PLC
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC B  H | IPC B  H

Claim 17:
18. An electrical power system comprising:
a DC power bus having first and second DC power bus terminals;
an electrical storage unit having first and second terminals, the second terminal connected to the second DC power bus terminal;
a DC:DC converter having first and second DC:AC converters and a transformer connected between the first and second DC:AC converters, the first DC:AC converter connected between the first terminal of the electrical storage unit and the first DC power bus terminal; and
a controller connected to control a switching operation of one or both of the first and second DC:AC converters
wherein each of the first and second DC:AC converters comprises a plurality of semiconductor devices, and
wherein the controller is configured to:
control a switching operation of each of the plurality of semiconductor devices; and
operate the first DC:AC converter to provide a bypass connection between the electrical storage unit and the DC power bus and disable the second DC:AC converter when a voltage across the electrical storage unit is above a threshold level.