A Coaxial Package Design for 1.7 kV Stacked Transient Voltage Suppression Diodes

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Abstract
High-power transient voltage suppression (TVS) diodes serve as the primary energy-absorbing elements in solid-state circuit breakers (SSCBs), providing rapid clamping of over voltages that threaten main interrupting devices. This paper presents a coaxial packaging solution for stacked TVS diodes, which achieves a dramatic reduction in commutation loop inductance from 95 nH to 3.8 nH, resulting in an approximately 96% reduction. Experimental validation, which demonstrates a substantial decrease in turn-off overvoltage from 950 V to 300 V, shows an approximate 68% reduction. A derived modular design is further proposed to achieve higher voltage ratings, enabling scalable deployment across different SSCB applications. The package performance is evaluated through finite element analysis (FEA) of inductance and electric field distribution and experimentally confirmed in a 1.7 kV/100 A SSCB. Results verify that the proposed coaxial package effectively mitigates loop inductance and overvoltage, enhancing both reliability and operational safety of high-power SSCBs.
Funding Information
  • Advanced Research Projects Agency - Energy
  • U.S. Department of Energy (DE-AR0001845)

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