US 11,675,011 B2
Switch condition monitoring
Seyed Amir Ali Danesh, Edinburgh (GB); Jonathan Ephraim David Hurwitz, Edinburgh (GB); William Michael James Holland, Edinburgh (GB); and Petre Minciunescu, Summerfield, NC (US)
Assigned to Analog Devices International Unlimited Company, Limerick (IE)
Filed by Analog Devices International Unlimited Company, Limerick (IE)
Filed on Aug. 15, 2019, as Appl. No. 16/541,916.
Prior Publication US 2021/0048478 A1, Feb. 18, 2021
Int. Cl. G01R 31/327 (2006.01); H01H 47/00 (2006.01); H03K 17/0812 (2006.01); H02M 7/5387 (2007.01)
CPC G01R 31/3275 (2013.01) [H01H 47/002 (2013.01); H03K 17/08122 (2013.01); H03K 17/08128 (2013.01); H02M 7/5387 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system for monitoring a condition of a switch, the system comprising:
a switch condition monitor unit configured to:
determine a plurality of measurements of impedance of the switch over time, the plurality of measurements of impedance comprising a first impedance measurement determined at a first point in time and a second impedance measurement determined at a second point in time that is later than the first point in time, each of the first and second impedance measurements being based on a respective combination of voltage and current;
determine that the switch is in a conducting state at the first point in time when the first impedance measurement is determined;
derive a value from the first impedance measurement in response to determining that the switch is in the conducting state at the first point in time when the first impedance measurement is determined;
after deriving the value, compute a difference between the second impedance measurement and the value derived from the first impedance measurement that was determined when the switch was in the conducting state; and
based at least in part on computing the difference between the second impedance measurement and the value derived from the first impedance measurement, monitor and determine a fault condition associated with the switch.