Life Testing of High-Value Annular Form Factor DC Link Capacitors for Applications with 105℃ Coolant

摘要

The SBE Power Ring Film CapacitorTM offers the advantages of high capacitance value, lowrnequivalent series resistance and inductance, and minimal temperature rise using polypropylene film.rnRecent work has addressed optimization of the Power Ring for automotive DC link applications withrnfunding from the US Department of Energy. Under this program, life testing of over 600 capacitorsrnvalued at 1000 μF has been performed to validate the design for coolant temperatures in the 105oCrnregime. This paper presents the methodology for the test program and describes the experimentalrnapparatus. Results are discussed for testing to date, which has provided two million unit hours ofrnexposure with only two failures observed after an initial pre-testing run which identified early failuresrnlater discovered to have defective film.