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

Yang, Hui-Chen; Simanjorang, Rejeki; See, Kye Yak

doi:10.1541/ieejjia.8.306

Cited by 17 publications

(4 citation statements)

References 13 publications

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“…15 shows the estimated peak junction temperature of the MOSFETs for each short-circuit duration. Direct measurement of the junction temperature poses a challenge due to the short duration of the short circuit, typically lasting only several-µs [35]- [37]. In Fig.…”

Section: Experimental Verificationmentioning

confidence: 99%

Overvoltage Suppression in Initial Charge Control for DC Capacitor Using Multiple Leg Short-Circuits With SiC-MOSFETs in Power Converters

Mannen

Wãda

2023

IEEE Open J. Power Electron.

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This paper proposes an improved overvoltage suppression method for the initial charge of the dc capacitor in voltage source power converters. The proposed method makes multiple short-circuits in each leg, utilizing power devices in the converter. These short-circuits discharge the dc capacitor and suppress overvoltage caused by resonant effects during the initial charge. The utilization of short durations of short-circuits multiple times in each leg reduces the power consumption in the power devices and results in a decrease in the peak junction temperature. Experimental verification using a 200-V, 5-kVA three-phase converter demonstrates that the proposed multiple short-circuit method reduces power consumption by 6% and suppresses device degradation by more than 40 times compared to the previously proposed single short-circuit method. The experimental results exhibit the effective overvoltage suppression capability of the proposed method with modest device degradation. As a result, the proposed method allows for the elimination of the initial charge circuit, leading to reductions in the size and cost of power converters, particularly in PWM rectifiers.INDEX TERMS Electrolytic capacitorless power converter, initial charge, short circuit, SiC-MOSFET.

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Section: Experimental Verificationmentioning

confidence: 99%

Overvoltage Suppression in Initial Charge Control for DC Capacitor Using Multiple Leg Short-Circuits With SiC-MOSFETs in Power Converters

Mannen

Wãda

2023

IEEE Open J. Power Electron.

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“…2) Small size for neater integration: One main motivation to increase switching speed with WBG devices is to reduce the sizes of passive components. The final converter can then be less costly with a much higher power density [13], [14]. Consequently, its integrated current sensors must be miniaturized too without compromising sensing accuracy and reliability [10], [15].…”

Section: Introductionmentioning

confidence: 99%

A Review of Megahertz Current Sensors for Megahertz Power Converters

Xin

Liu

et al. 2022

IEEE Trans. Power Electron.

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Within a power converter, multiple currents are usually measured for control, protection, and/or monitoring. They are therefore important sources of information, which must unquestionably be measured accurately to maintain continuous and reliable operation of the power converter. Accurate current measurement has however become tougher with the introduction of wide band-gap (WBG) devices with switching frequency tending towards the Megahertz (MHz) range. Because of that, the installed current sensors must have a significantly widened bandwidth. Moreover, they must be nonintrusive and compact, in order not to degrade fast switching characteristics and high power density of the WBG converter. Presently, these features are not collectively obtainable from existing commercial current sensors. Consequently, many new current sensing techniques have surfaced in the literature for usage with the more demanding MHz power converter. These new techniques, some classical techniques, and their hybrid integrations are now reviewed, after overviewing functionalities made possible by current sensors in a power converter. Last but importantly, some future developmental trends aimed at matching MHz current sensors with MHz power converters are described, before concluding the paper.

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“…Such devices make the circuit possible to operate at a higher switching frequency compared with the use of conventional devices. This allows an increase of power density, by reducing the size of the passive elements [1], [2].…”

Section: Introductionmentioning

confidence: 99%

Design of an Integrated Air Coil for Current Sensing

Kuwabara

Wãda

Guichon

et al. 2020

IEEE J. Emerg. Sel. Topics Power Electron.

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This article proposes a design procedure of an integrated air coil in a laminated bus bar for current sensing. The concept is based on an air coil inserted into the insulators inside the laminated bus bar, avoiding the use of intrusive current sensors with an additional stray inductance. First, the basic principle of the integrated current sensor is described, and the relationship between the mutual inductance and the structure of the air coil is discussed. Next, the frequency characteristic of the current sensor obtained based on an equivalent circuit is detailed, the parameters of which are derived from the sensor structure. A postprocessing method is proposed to achieve a 100-MHz frequency bandwidth. A prototype of the current sensor is designed based on the proposed design procedure, and the frequency characteristic is evaluated. The validations of the design procedure and the postprocessing method are confirmed experimentally.

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

Cited by 17 publications

References 13 publications

Overvoltage Suppression in Initial Charge Control for DC Capacitor Using Multiple Leg Short-Circuits With SiC-MOSFETs in Power Converters

Overvoltage Suppression in Initial Charge Control for DC Capacitor Using Multiple Leg Short-Circuits With SiC-MOSFETs in Power Converters

A Review of Megahertz Current Sensors for Megahertz Power Converters

Design of an Integrated Air Coil for Current Sensing

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