Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 31, Issue 5, Pages 3784-3793Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2015.2464714
Keywords
Insulated-gate bipolar transistor (IGBT); power semiconductor devices; reliability; temperature measurement
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An electrical method for junction temperature measurement of MOS-gated power semiconductor devices is presented. The measurement method involves detecting the peak voltage over the external gate resistor of an insulated-gate bipolar transistor or MOSFET during turn-on. This voltage is directly proportional to the peak gate current, and fluctuates with temperature due to the temperature-dependent resistance of the internal gate resistance. Primary advantages of the method include an immunity to load current variation, and a good linear relationship with temperature. A measurement circuit can be integrated into a gate driver with no disruption to operation and allows autonomous measurements controlled directly via the gate signal. Advantages and disadvantages of the method are discussed.
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