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US4360850A Intrinsically safe electrostatic assist units 失效
本质安全型静电助力装置

Intrinsically safe electrostatic assist units
摘要:
A high-voltage crowbar circuit continually senses the load impedance and crowbars the output voltage applied to a load if the load impedance falls below a selected value. A differentiator circuit at the load senses variations in load voltage and can trigger the crowbar operation if the voltage variation as a function of time exceeds a preselected load.
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