Ultra-high accuracy on-chip temperature sensor in RC-IGBT module for xEV

Konferenz: PCIM Europe 2019 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
07.05.2019 - 09.05.2019 in Nürnberg, Deutschland

Tagungsband: PCIM Europe 2019

Seiten: 4Sprache: EnglischTyp: PDF

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Ogawa, Eri; Nakayama, Tomoya; Yoshida, Souichi; Takenoiri, Shunji; Otsuki, Masahito (Fuji Electric Co., Ltd, Japan)
Ewald, Steffen (Fuji Electric Europe GmbH, Germany)

An IGBT with an on-chip temperature sensor is able to sense chip temperature directly. The accuracy is higher than the one of conventional negative temperature coefficient (NTC) thermistor. In general, the temperature-sensor diode has an inaccuracy of ± 6 ºC due to inaccuracy in the junction diode process like ion implantation. High accuracy of ± 1 ºC can be achieved by using correction offset functions for the voltage of the temperature diode in a gate drive IC. A comparison of the new method of temperature measurement with the conventional NTC method has been done by simulation. Due to higher accuracy of the on-chip sensor method the maximum current through the sensor could be increased by 13%. Thus the system size might be reduced.