Patent ID: 11870358
Assignee: DEERE & COMPANY
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 11:
12. A system for detecting a fault in a three-phase dual active bridge converter, the system comprising:
a dual active bridge converter comprising a primary side converter, a secondary side converter, and a transformer;
an interface for measuring a current at an output terminal of the primary side converter, the interface coupled to an input of a low-pass filter;
the low-pass filter configured to isolate a DC signal component derived from the measured current at the output terminal of the primary side converter;
a controller adapted to perform the followings steps:
detect polarity states of a DC signal component in each phase of the output terminal of the primary side converter during one or more successive sampling intervals;
compare the polarity states to a bias pattern;
matching the polarity states to a corresponding fault of the bias pattern during one or more sampling intervals to identify the fault on the primary side converter or the secondary side converter; and
continuing operation of the three-phase dual active bridge converter without power derating when the fault is identified in the secondary side converter.