Intrinsically safe audio power current circuit and device using same
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United States of America Patent
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Sep 20, 2016
Grant Date -
Jun 30, 2016
app pub date -
Dec 30, 2014
filing date -
Dec 30, 2014
priority date (Note) -
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Abstract
An intrinsically safe audio power circuit includes redundant electronic fuses disposed between the power input of an audio power amplifier and the battery source of the portable two-way radio device. The electronic fuse circuits are connected in series with each other, and each electronic fuse circuit includes a series switch transistor that can shut off the flow of current between the battery and the audio power amplifier. Each electronic fuse circuit also includes a current sense portion, and when the current through the electronic fuse circuits reaches a current threshold, it will shut off its series switch transistor using an active bias circuit in order to ensure sufficiently rapid shut off.
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