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In this paper, the degradation at the gate oxide layer of a SiC MOSFET has been studied. The online condition monitoring was achieved by Spread Spectrum Time Domain Reflectometry (SSTDR) for the first time in SiC based devices. An accelerated aging station was built to age the power semiconductor devices in a standardized way, and power cycling test was performed to induce degradation. Finally, the...
This paper assesses different energy loss estimation methods using the supercapacitor model parameters extracted from the electrochemical impedance spectroscopy (EIS). Two energy loss estimation methods are applied to two similar supercapacitors from different manufacturers operating under constant power charge-discharge cycling. The simpler loss method uses only the impedance data that corresponds...
In this paper, a testing methodology for ageing quantification of supercapacitors (SC) for Hybrid Electric Vehicles (HEV) applications is investigated. The performances regeneration of supercapacitors after power cycling tests is studied. Parameters of double layer capacitor (EDCL) may be recovered after it is has faded. This phenomenon is characterized by an increase of the capacitance, a decrease...
Supercapacitors are commonly based on porous activated carbon electrodes and on electrostatic charge storage mechanism. The carbon electrodes are supposed to be chemically and electrochemically inert and the electrostatic nature of the charge storage mechanism is highly reversible. These properties should ensure to supercapacitors an infinite shelf life. But in practice, supercapacitor cells exhibit...
This paper proposes a dynamic electrothermal model that can be simulated with the power electronic circuit simulator. It includes a temperature-dependent loss calculation of power semiconductor devices. The proposed model is used to estimate the transient junction temperature of the semiconductor devices. In so doing, the resulting junction temperature is used to facilitate the power sharing between...
This paper deals with the lifetime of supercapacitors used in transportation. Increasing onboard electrical devices require adapted storage elements like supercapacitors to supply all electrical systems. Reliability and lifetime are two major factors for electrical storage system. Based on accelerated ageing, some supercapacitors have been studied using a dedicated test bench. Temperature, voltage,...
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