Abstract
Investigation about the junction temperature estimation of IGBT modules is significant in reliability research and design ar-ea. In addition to temperature-dependent electrical parameters and thermal model methods, the non-contact approaches have attracted more attention with the increment of IGBT power level. In this paper, a novel on-line IGBT junction temperature estimation method is proposed based on the peak value of electromagnetic radiation (EMR) signal induced by the fast turn-off collector to emitter current. An EMR near field probe is used to measure the EMR signal and the peak value is proposed as a characteristic to calculate IGBT junction temperature. The principle of junction temperature estimation method based on EMR was studied firstly. Then, a single pulse test platform was established to investigate the relationship between IGBT junction temperature and the EMR peak value. The influence of load current was also investigated. The linear dependence of IGBT junction temperature on the EMR peak value was found and the temperature sensitivity ranged from 0.091mV/°C to 0.375mV/°C with the average V peak of 26.8mV and 128.5mV respectively. Thus, the EMR peak value can be regarded as a temperature-dependent characteristic to implement non-contact IGBT junction temperature estimation on line.
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