2007 IEEE International Conference on Solid Dielectrics 2007
DOI: 10.1109/icsd.2007.4290850
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Abstract: The properties of bulk insulation in printed circuit boards (PCBs) have become even more important, especially for those with a multilayered or embedded structure. In particular, the spatial distribution of internal charge carriers, mainly due to ionic impurities, is thought to affect the reliability of bulk insulation. Therefore, the effects of humidity and temperature on space charge distribution profiles in a five-layered composite of aramid paper and epoxy resin are studied in this paper. More charge carri… Show more

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Cited by 6 publications
(4 citation statements)
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“…When dealing with impregnated paper insulation, or alternated oil/impregnated paper, relatively thick layers, typically 70 µm are used [3]. Echigo et al reported on space charges in 5-layers stratified PCB made of aramid paper and epoxy resin, with about 100 µm thickness for each layer [10]. In these cases, the electrode signals were clear enough to allow calibration.…”
Section: Measurements On Multi-layersmentioning
confidence: 99%
“…When dealing with impregnated paper insulation, or alternated oil/impregnated paper, relatively thick layers, typically 70 µm are used [3]. Echigo et al reported on space charges in 5-layers stratified PCB made of aramid paper and epoxy resin, with about 100 µm thickness for each layer [10]. In these cases, the electrode signals were clear enough to allow calibration.…”
Section: Measurements On Multi-layersmentioning
confidence: 99%
“…As may be concluded from the above results, a heterocharge appears near the anode at any temperature, thus enhancing the electric field. The formation of the heterocharge can probably be explained by ionic dissociation due to the water [4,5]. Thus, we prepared ultrapure water with a resistivity of 18.3 MΩ⋅cm at 25 °C by using a Milli-Q SP system by Millipore, and immersed the samples with a weight of 1.0 g for 100 hours at 25, 40, 65, and 85 °C.…”
Section: Space Charge Distribution and Electric Field Distributionmentioning
confidence: 99%
“…The space charge that directly affects the electric field distribution inside a PCB is produced mainly by ionic impurities, and thus is often observed at high temperature and high humidity [4][5][6]. There are several studies of the influence of temperature on space charge behavior inside PCBs [4][5][6][7], but little has been found so far about the relationship between humidity and space charge [5,6]. In this study, we examine the behavior of the space charge inside a PCB depending on the water temperature and water absorption time during moisture absorption treatment.…”
Section: Introductionmentioning
confidence: 99%
“…63 Therefore, the transit speed of charge packets can also be enhanced for polymeric samples with moisture. 63,64 Montanari and Palmieri owed the disappearance of the charge packet occurring at very high fields under large relative humidity to the increased availability of shallower traps. 65 Another noteworthy conclusion is that electric field threshold also decreases with increasing relative humidity.…”
Section: Humidity and Inherent Moisturementioning
confidence: 99%