Invention Grant
- Patent Title: Rectifier diode fault detection in brushless exciters
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Application No.: US14573759Application Date: 2014-12-17
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Publication No.: US09910083B2Publication Date: 2018-03-06
- Inventor: Vaiyapuri Viswanathan , Amit Kumar Gupta , Chandana Jayampathi Gajanayake , Sivakumar Nadarajan
- Applicant: ROLLS-ROYCE PLC
- Applicant Address: GB London
- Assignee: ROLLS-ROYCE PLC
- Current Assignee: ROLLS-ROYCE PLC
- Current Assignee Address: GB London
- Agency: Oliff PLC
- Priority: GB1400702.5 20140116
- Main IPC: G01R31/26
- IPC: G01R31/26 ; G01R23/02 ; G01R31/34 ; G01R31/40 ; H02H7/125 ; H02K11/20

Abstract:
A method of detecting a diode fault in an AC signal rectifier circuit, the AC signal rectifier circuit including a plurality of diodes, and being arranged to supply a rectified output voltage to a load, wherein the method includes the steps of deriving an operating value indicative of the ratio of the voltage magnitudes of a first harmonic frequency and another harmonic frequency of the rectified output voltage across the load; and determining whether a fault has occurred in one or more diodes on the basis of the derived operating value. The first harmonic frequency is preferably the fundamental harmonic frequency, and/or the another harmonic frequency is preferably the 6th harmonic frequency.
Public/Granted literature
- US20150198655A1 RECTIFIER DIODE FAULT DETECTION IN BRUSHLESS EXCITERS Public/Granted day:2015-07-16
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