Condition monitoring by cross-correlation of switching-mode power supplies

摘要

A method of monitoring an output signal of a switching-mode power supply for the presence and magnitude of the switching frequency comprises sampling the output signal at a sampling frequency above the minimum Nyquist limit to provide a succession of samples; cross-correlating a reference signal and the samples to provide cross-correlation values; and monitoring the cross-correlation values to ascertain the magnitude of a component of the output signal at or near the frequency of the reference signal.

主权项

1. A method of condition monitoring a switching-mode power supply providing electrical power to a subsea installation by monitoring an output signal of a switching-mode power supply operating at a known switching frequency and disposed at a subsea location, method comprising:
sampling the output signal of a subsea located switching-mode power supply at a sampling frequency above a minimum Nyquist limit to provide a succession of samples; cross-correlating (a) a reference signal at the known switching frequency and (b) said succession of samples to provide cross-correlation values; monitoring the cross-correlation values to ascertain a magnitude of a component of the output signal at or near the known switching frequency; and providing an indication of impending power supply degradation or failure if said ascertained magnitude exceeds a predetermined threshold.