Estimation of life of switching devices

US12248016B2 · kind B2 · utility

Assignee

• Eaton Intelligent Power Limited · IE

Inventors

• Deepak Balaji Somayajula · Ashti, IN
• Swati Narula · New Delhi, IN
• Sravanthi Srikantam · Vemula, IN
• Satish Mohanty · Pune, IN
• Chaitanya Bhalwankar · Jamkhed, IN
• Stuart John Moody · Boarhunt, GB
• Daniel A. Peck · South Windsor, US
• Ranjith Kumar Sreenilayam Raveendran · Ashti, IN

Key dates

• Filing date: Dec 12, 2022
• Grant date: Mar 11, 2025
• Expiry date: May 16, 2043

Classification

• Technology area (CPC G): Physics
• CPC primary: G05B23/0283
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A health signature of each switching device in a control system is estimated using system parameters such as a DC-link voltage, three-phase voltages, three-phase currents, and temperature. The switching devices can be implemented as transistors, and a health signature for each transistor may be an on-state resistance or an on-state voltage of the transistors. For example, the on-state resistance for a metal-oxide-semiconductor field-effect transistor (MOSFET) functions as a health signature. Alternatively, the on-state voltage is used as a health signature for an insulated-gate bipolar transistor (IGBT). Additionally, a junction temperature is estimated for each transistor. Using the estimated health signatures and the junction temperatures, the remaining useful life of each transistor is estimated.