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oapen-20.500.12657-493702021-11-23T14:01:54Z Chapter Polyimide Films for Digital Isolators Diaham, Sombel Chen, Baoxing polyimide films, digital isolators, high voltage, lifetime model, charge injection, barrier effect bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues::TBC Engineering: general Digital isolators provide compelling benefits over legacy opto-couplers in terms of high speed, low power consumption, high reliability, small size, high integration, and ease of use. Billions of digital isolators using micro-transformers have been widely adopted in many markets including automotive, industry automation, medical, and energy. What are essential for the high voltage performance for these digital isolators are polyimide films deposited in between the top spiral winding and bottom spiral winding for the stacked winding transformers. In this chapter, digital isolator construction using polyimide films as isolation layers will be reviewed. To meet various safety standards such as UL and VDE, digital isolators need to satisfy various high voltage performances, such as short duration withstand voltage, surge voltage, and working voltage. Polyimide aging behavior under various high voltage waveforms such as AC or DC was studied, and isolator’s working voltage is extrapolated through a polyimide lifetime model. Structural improvements to improve polyimide high voltage lifetime will also be discussed. 2021-06-02T10:13:25Z 2021-06-02T10:13:25Z 2020 chapter ONIX_20210602_10.5772/intechopen.93343_484 https://library.oapen.org/handle/20.500.12657/49370 eng application/pdf n/a 73151.pdf InTechOpen 10.5772/intechopen.93343 10.5772/intechopen.93343 09f6769d-48ed-467d-b150-4cf2680656a1 H2020-MSCA-IF-2018 846455 open access
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Digital isolators provide compelling benefits over legacy opto-couplers in terms of high speed, low power consumption, high reliability, small size, high integration, and ease of use. Billions of digital isolators using micro-transformers have been widely adopted in many markets including automotive, industry automation, medical, and energy. What are essential for the high voltage performance for these digital isolators are polyimide films deposited in between the top spiral winding and bottom spiral winding for the stacked winding transformers. In this chapter, digital isolator construction using polyimide films as isolation layers will be reviewed. To meet various safety standards such as UL and VDE, digital isolators need to satisfy various high voltage performances, such as short duration withstand voltage, surge voltage, and working voltage. Polyimide aging behavior under various high voltage waveforms such as AC or DC was studied, and isolator’s working voltage is extrapolated through a polyimide lifetime model. Structural improvements to improve polyimide high voltage lifetime will also be discussed.
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