On Vc Method: In Situ Temperature Estimation and Aging Detection of High-Current IGBT Modules Used in Magnet Power Supplies for Particle Accelerators. - Panagiotis Asimakopoulos; Konstantinos Papastergiou; Torbjörn Thiringer; Massimo Bongiorno; Gilles Le Godec (IEEE Trans. Ind. Electron., 2019)