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Correction method for calculating junction temperature considering parasitic effects in SiC MOSFETs
Fan Liu,Mingxing Du,Jinliang Yin,Chao Dong,Ziwei Ouyang 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.4
The turn-on change rate of drain current diDS(on)/dt is an electrical parameter that is suitable for the online monitoring of junction temperature in SiC MOSFETs. In practical applications, the change of an external circuit changes the temperature-sensitive characteristic of diDS(on)/dt. In this paper, a SiC MOSFET in a Buck converter is taken as the research object. First, it is theoretically derived and experimentally verified that the power loop inductance and drive loop resistance are parasitic parameters that affect the temperaturesensitive characteristic of diDS(on)/dt. Second, according to the spectrum peak characteristics caused by the drain–source turn-off oscillation voltage of the SiC MOSFET, the theoretical relationship between the diDS(on)/dt temperature-sensitive characteristic and the peak of the drain–source turn-off oscillation voltage is studied. It is concluded that the spectrum peak can reflect the change of the diDS(on)/dt temperature-sensitive characteristic caused by the change of the parasitic parameters. Based on the above research, a model of a modified diDS(on)/dt temperature-sensitive characteristic considering parasitic effect is established in this paper. Through experimental verification, this model can largely eliminate the junction temperature monitoring error caused by the change of the external circuit.
A new device built to measure the mechanical characters of the double ended tuning Fork
Guo Zhanshe,An Ying,Li Yilun,Wang Jinliang,Fan Shangchun 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.12
A new device is built to measure the mechanical characters of the double ended tuning fork which is used as the sensitive element ofresonant sensor. It is mainly composed of a three dimensional workbench, a force sensor, a servo motor, control circuit and a photodiode. Detailed theoretical analysis is carried out to verify the feasibility of the design and some experiments have been done to test the performanceof the device. Firstly, the calibrated result of the force sensor shows that the applied force possesses good linear relationshipwith the output voltage. Then, zero drift character indicates that the force drift is just 0.1N and the stability performance of the appliedforce is also detected. Finally, the axial force loading test is carried out. In conclusion, the above experiments prove that the designedscheme is right and reliable to measure the mechanical characters of the double ended tuning fork.