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Improving the frequency response of ceramic dielectrics for high power applications in power electronic converters

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3 Author(s)
Campbell, C.K. ; Fac. of Eng., Rand Afrikaans Univ., Johannesburg, South Africa ; van Wyk, J.D. ; Holm, M.F.K.

High-voltage (1000 V) distributed and lumped ceramic capacitors are under development for diverse applications in integrated power-electronics structures and systems for cost-efficient production. These applications range from systems involving new integrated packaging and manufacturing technologies such as for dc-dc converters, to optimal power-component designs such as in dissipative RCD turn-off snubber circuits for high-power transistor or thyristor switch protection. Their design requires an understanding of the interacting ferroelectric, grain-boundary, and space-charge mechanisms controlling the high-voltage and low-frequency response. This paper relates to an experimental and theoretical study of high-voltage (0 to 1000 VDC) acceptor-doped barium-titanate BaTiO3 ceramic capacitors, for several possible uses in integrated power-electronic converters with flat voltage and frequency response up to 1 MHz. The paper includes interpretations, based on experiment, of the inter-dependence of (a) ferroelectric-grain, (b) semiconductor-compensation-insulator-compensation-semiconductor (n-c-i-c-n) grain-boundary, and (c) Debye space-charge contributions to capacitance, as functions of acceptor doping

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Components, Packaging, and Manufacturing Technology, Part A, IEEE Transactions on  (Volume:19 ,  Issue: 4 )