Patent ID: 11916431
Assignee: ABB SCHWEIZ AG
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 13:
14. An uninterruptible power supply comprising:
a DC split link with a positive line, a floating midpoint, and a negative DC line;
a first DC capacitance arranged between the positive line and the floating midpoint;
a second DC capacitance arranged between the negative DC line and the floating midpoint;
a first resistor arranged in parallel to the first DC capacitance;
a second resistor is arranged in parallel to the second DC capacitance, wherein the first and the second resistors are configured to be engaged at least during a pre-charge phase of the converter;
a first switchable contact is arranged in series with the first resistor;
a second switchable contact is arranged in series with the second resistor; and
a controller configured to switch the first and the second switchable contacts.