Light activated solid-state opening switches

Light-activated cryogenic silicon opening switches were designed and tested in an inductive power circuit. Current interruption times of 20 mu S at current densities of 75 A/cm/sup 2/ were demonstrated with flashlamp optical sources at 77 K. Photoswitch measurements and modeling show that electrical contacts, optical trigger, and window design are critical parameters in optimizing opening switch on-stage current and voltage commutation. Technology paths have been identified for increasing photoswitch power ratings and include room-temperature operation using laser diode arrays. The demonstrated high average power operation and power density capability of light-activated opening switches make them a viable switch technology for developing compact inductive power systems.<
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