Spatiotemporal Measurement of Charge at Ceramic Substrate-Silicone Gel Interface in Medium-Voltage Power Modules

With the proliferation of high-voltage, high-power density devices, insulation failure has emerged as a latent hazard in power modules. Notably, breakdown along ceramic substrate-silicone gel interfaces is a typical insulation failure process in power modules, necessitating particular attention and...

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Vydáno v:	IEEE transactions on power electronics Ročník 39; číslo 12; s. 15360 - 15375
Hlavní autoři:	Li, Kaixuan, Zhang, Boya, Yang, Ziyue, Jiang, Xinyu, Yao, Minghan, Li, Xingwen
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	IEEE 01.12.2024
Témata:	Discharge detection method Electric fields Encapsulation Insulation interfacial charge kinetics inversion algorithm Kinetic theory Medium voltage medium-voltage module insulation status Multichip modules Optical polarization Optical refraction Optical variables control Pockels effect Spatiotemporal phenomena
ISSN:	0885-8993, 1941-0107
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Abstract	With the proliferation of high-voltage, high-power density devices, insulation failure has emerged as a latent hazard in power modules. Notably, breakdown along ceramic substrate-silicone gel interfaces is a typical insulation failure process in power modules, necessitating particular attention and elucidation. Specifically, the charge movement characteristics that play a pivotal role in the failure process should be expounded. However, the lack of characterization methods currently renders these characteristics unclear. In this study, we proposed a method for the spatiotemporal measurement of the interfacial charge density between a direct-bonded copper ceramic and silicone gel. A reflective optical system was developed based on the Pockels effect to enable the measurement of nontransparent samples, such as encapsulation structures, in power modules. The measurement range of the optical system is ±20 kV. The interfacial charge density was calculated using an inversion algorithm. Charge dynamics at inaccessible interfaces were described for the first time. The threshold is ∼100 pC/mm 2 with 10- μ s temporal and 27- μ m spatial resolution. Compared with traditional methods, the proposed method stands out for its superior spatiotemporal dimensionality. Besides, it enables visual measurements, making it a solution for monitoring insulation status and diagnosing insulation defects specifically for encapsulation structures in power modules. The proposed method can help engineers improve the insulation design of power modules. This article is accompanied by a video demonstrating the dynamic process of discharge.
AbstractList	With the proliferation of high-voltage, high-power density devices, insulation failure has emerged as a latent hazard in power modules. Notably, breakdown along ceramic substrate-silicone gel interfaces is a typical insulation failure process in power modules, necessitating particular attention and elucidation. Specifically, the charge movement characteristics that play a pivotal role in the failure process should be expounded. However, the lack of characterization methods currently renders these characteristics unclear. In this study, we proposed a method for the spatiotemporal measurement of the interfacial charge density between a direct-bonded copper ceramic and silicone gel. A reflective optical system was developed based on the Pockels effect to enable the measurement of nontransparent samples, such as encapsulation structures, in power modules. The measurement range of the optical system is ±20 kV. The interfacial charge density was calculated using an inversion algorithm. Charge dynamics at inaccessible interfaces were described for the first time. The threshold is ∼100 pC/mm 2 with 10- μ s temporal and 27- μ m spatial resolution. Compared with traditional methods, the proposed method stands out for its superior spatiotemporal dimensionality. Besides, it enables visual measurements, making it a solution for monitoring insulation status and diagnosing insulation defects specifically for encapsulation structures in power modules. The proposed method can help engineers improve the insulation design of power modules. This article is accompanied by a video demonstrating the dynamic process of discharge.
Author	Zhang, Boya Jiang, Xinyu Li, Xingwen Li, Kaixuan Yao, Minghan Yang, Ziyue
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Snippet	With the proliferation of high-voltage, high-power density devices, insulation failure has emerged as a latent hazard in power modules. Notably, breakdown...
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SubjectTerms	Discharge detection method Electric fields Encapsulation Insulation interfacial charge kinetics inversion algorithm Kinetic theory Medium voltage medium-voltage module insulation status Multichip modules Optical polarization Optical refraction Optical variables control Pockels effect Spatiotemporal phenomena
Title	Spatiotemporal Measurement of Charge at Ceramic Substrate-Silicone Gel Interface in Medium-Voltage Power Modules
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