Solid state switches are being actively pursued to replace tlryra tons, ignitrons and triggered spark gaps in various pulse power applications. These include electricgun development for tanks such as the EM gun (electromagnetic) and the ETC gun (electrothermal) and electromechanical launcher for aircraft. High power thyristors and rectifier diodes have been applied in stringeht power cycling applications in the past with predictable life assurance. The validity of a simple mathematical concept expressing life in terms of numbers of power cycles versus temperature excursion is explained and supported by examples of empirical test data.

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