US 12,248,016 B2
Estimation of life of switching devices
Deepak Balaji Somayajula, Maharashtra (IN); Swati Narula, New Delhi (IN); Sravanthi Srikantam, Andhra Pradesh (IN); Satish Mohanty, Pune (IN); Chaitanya Pradeep Bhalwankar, Pune (IN); Stuart John Moody, Portchester (GB); Daniel Peck, Southampton (GB); and Ranjith Kumar Sreenilayam Raveendran, Maharashtra (IN)
Assigned to EATON INTELLIGENT POWER LIMITED, Dublin (IE)
Filed by EATON INTELLIGENT POWER LIMITED, Dublin (IE)
Filed on Dec. 12, 2022, as Appl. No. 18/079,707.
Prior Publication US 2023/0194593 A1, Jun. 22, 2023
Int. Cl. G01R 31/26 (2020.01); G01R 31/28 (2006.01); G05B 23/02 (2006.01)
CPC G01R 31/2642 (2013.01) [G01R 31/2874 (2013.01); G05B 23/0283 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A method of estimating a remaining useful life (RUL) of a switching system that includes a plurality of p-type switching devices and a plurality of n-type switching devices, the switching system used in a three-phase control system, the method comprising:
estimating a health signature of the switching system while the switching system is in use to control a three-phase motor, including:
determining the health signature of each of the p-type switching devices during positive peaks of a three-phase current associated with the three-phase control system;
determining the health signature of each of the n-type switching devices during negative peaks of the three-phase current associated with the three-phase control system;
estimating a junction temperature of each of the plurality of p-type switching devices and the plurality of n-type switching devices;
based on a relationship between the power dissipation and the junction temperature with respect to a pre-defined operating condition at a pre-defined temperature, normalizing the health signature to generate a normalized health signature;
calculating a health state estimation matrix by modeling the degradation of the normalized health signature over a time interval using Kalman filtering;
using the health state estimation matrix, determining a health state of the switching system at a first time;
forecasting, based on the health state and the health state estimation matrix, a time at which the each of the plurality of p-type switching devices and each of the plurality of n-type switching devices within the switching system reach a failure criterion; and
causing a notification to be provided to an output device, the notification including the time at which the each of the plurality of p-type switching devices and each of the plurality of n-type switching devices is forecasted to reach the failure criterion.