Real-time integratable isolated voltage monitoring unit of semiconductor power switch to improve power converter reliability

Yang, Hui-Chen; See, Kye Yak; Tseng, King Jet; Simanjorang, Rejeki

doi:10.1109/apec.2017.7930915

Cited by 2 publications

(1 citation statement)

References 14 publications

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“…An analog temperature sensor (LMT70, Texas Instruments) is attached to the heatsink surface in adjacent to M SiC for heatsink temperature measurement. A voltage measurement circuit with embedded isolation feature (isolated voltage monitor, IVM) (17) is incorporated for on-state voltage measurement.…”

Section: Junction Temperature Monitoring On Boost Convertermentioning

confidence: 99%

A Method of Junction Temperature Estimation for SiC Power MOSFETs via Turn-on Saturation Current Measurement

Yang

Simanjorang²,

See

2019

IEEJ Journal IA

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Maintaining the operating junction temperature of a SiC Power MOSFET within a safe and tolerable range is crucial not only for safety reasons, but also for reliable operation, as thermal transient is one of the major stressors that threaten a device's life span. Conventional methods use thermal sensors for temperature monitoring. However, these sensors require extra space, and the measurement accuracy is affected by their position. Besides, they are unable to track the transient temperature variation owing to relatively slow response time. This paper proposes a new temperature sensor-less method to estimate the junction temperature of SiC power MOSFETs by measuring the device's turn-on saturation current (I D,sat ). The device's square root of the saturation current ( I D,sat ) and threshold voltage (V th ) can be extracted and adopted as junction temperature estimators. Compared to the threshold voltage, the square root of the saturation current has the advantage of a shorter test time. The feasibility of this temperature estimation method has been experimentally verified. The results suggest that the proposed method can be used as an alternative for effective online junction temperature monitoring.

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Section: Junction Temperature Monitoring On Boost Convertermentioning

confidence: 99%