Partial discharge control in a power electronic module using high permittivity non-linear dielectrics

Wang, Ningyan; Cotton, Ian; Robertson, J.A.L.; Follmann, Sarah; Evans, Kim; Newcombe, D. R.

doi:10.1109/tdei.2010.5539704

Cited by 104 publications

(52 citation statements)

References 18 publications

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“…The inclusion of barium titanate into the silicone gel does not significantly disturb the curing characteristics of the gel and nor does it significantly affect the adhesive qualities [6]. Before filled silicone gel was poured into the module, the dielectric properties of the composite were tested and analyzed.…”

Section: Resultsmentioning

confidence: 99%

“…As the barium titanate ceramic powders with 15% volume ratio were evenly mixed with silicone gel, a theoretical permittivity εeff 5.42 of the composite silicone gel was obtained by calculating. The composite silicone gel system is actually tested by bias voltage, and the dielectric constant depends on the variation of the electric field strength as follows [6], (2) Accordingly, as the filled silicone gel is fit in a higher bias field, its dielectric constant also increases.…”

Section: Resultsmentioning

confidence: 99%

“…Experiments and simulations show that PDs mainly occur at the sharp edges of metallization on ceramic substrates [2][3][4][5].Two main research directions have been developed to solve this problem. One way is the development of new dielectric gels and substrate with higher capabilities [6][7][8]. The other is the study and the localization of the field reinforcement and the maximum values generated.…”

Section: Introductionmentioning

confidence: 99%

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Electric Field Distribution in High Voltage Power Modules Using Finite Element Simulations

Wang

Liu²

2018

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract. With the development of the high voltage insulated gate bipolar transistor (IGBT) power module, it leads to serious problems concerning the electric field insulation. The electric field capabilities of the silicone gels used in the power module encapsulation directly affect the module insulation. Some solutions have been developed to optimize the electric field and reliability. In this letter, the finite element simulation was used to analyze and localize the maximum electric field position; solutions were proposed to improve the module insulation. It's demonstrated that BaTiO3 silicone composite is a promising insulation material for high voltage power device.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electric Field Distribution in High Voltage Power Modules Using Finite Element Simulations

Wang

Liu²

2018

IOP Conf. Ser.: Earth Environ. Sci.

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“…The discussed improvements include a coating of the edge (non-linear resistive materials, high-resistive materials, etc. ), 3Dintegration, embedding of the metallization, and stacking of substrates [16][17][18][19][20][21]. Furthermore, the PDIV can be increased by inert fluids instead of potting like silicone gels with the same permittivity and with increased permittivity of the fluids.…”

Section: Introductionmentioning

confidence: 99%

Partial discharges in ceramic substrates - correlation of electric field strength simulations with phase resolved partial discharge measurements

Bayer

Waltrich

Soueidan

et al. 2016

2016 International Conference on Electronics Packaging (ICEP)

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High voltages and the edges of the metallization on ceramic substrates (AMB, DBA, DBC, HTCC, LTCC) lead to high electric field strengths. In the vicinity of the metal edges these high electric field strengths induce partial discharges in the ceramic insulation and in the covering synthetics and thereby represent one key degradation mechanism of power modules. In this work the correlation of the simulated electric field strength with phase resolved partial discharge (PRPD) measurements has been investigated. For the simulation of the electric field strength a new method was used to bypass numerical artifacts. The simulated values showed that it is possible to reduce the electric field strength by an adaption of the metallization structure. There the distance of the upper and the lower metallization to the rim of the ceramic was changed relative to each other. Due to this variation a reduction of the electric field strength by about 30 % can be reached by choosing the optimum distance compared to state of the art modules. In PRPD measurements for ceramic substrates (AlN/Al2O3 by DCB) we examined whether the field reduction leads to higher partial discharge inception voltages (PDIV). The measurements were executed on layouts with different dimensions of the upper and lower metallization relative to each other as well as for 3 different thicknesses of the ceramic insulation (1 mm and 0.63 mm AlN DBC, 0.63 mm and 0.38 mm Al2O3 DBC) layer. An increase from 20 % to 35 % of the PDIV was measured for layouts which were designed according to the findings from the simulation with respect to field strength reduction. Finally, the calculated electric field strength and the measured PDIV were correlated

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“…RECENTLY the power semiconductor market is growing rapidly and market demands have become harsh, where low price, higher efficiency, compactness, high reliability, and higher operating voltage are required [1,2]. These requirements result in the higher electric field strength within the modules and call for the optimization of insulation designing.…”

Section: Introductionmentioning

confidence: 99%

Dynamic potential distributions of surface discharge in silicone gel

Sato

Kumada

Hidaka

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

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Silicone gel is widely used to encapsulate power electronic circuits. It is known that the weakness of this insulation system is the surface discharges between gel and substrate. These discharges give rise to the growth of cavities in gel, which may lead to eventual failure of the insulation. Despite the fact, surface discharges in gel has not yet been studied enough. In order to clarify the nature of streamers in the cavity and relation between streamer propagation and charge accumulation at the interface of the cavity, the relation between apparent charge, light emission, motion of the cavities, and dynamic potential distribution of surface discharge in silicone gel was investigated. The results showed that conductive streamers initiate at the electrode, propagate through the cavity and accumulate charges on the cavity surface. In addition, it was confirmed that conductivity of the cavity surface is low.

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Partial discharge control in a power electronic module using high permittivity non-linear dielectrics

Cited by 104 publications

References 18 publications

Electric Field Distribution in High Voltage Power Modules Using Finite Element Simulations

Electric Field Distribution in High Voltage Power Modules Using Finite Element Simulations

Partial discharges in ceramic substrates - correlation of electric field strength simulations with phase resolved partial discharge measurements

Dynamic potential distributions of surface discharge in silicone gel

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