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One of the bead-type emergency light circuits
Source: InternetPublisher:MartinFowler Keywords: Emergency lights batteries rectifiers Updated: 2021/12/28
When the mains power is normal, the relay KA is closed, and the bead bubble EL is powered by the mains power after voltage reduction.
At the same time, the battery GB is charged by the mains voltage step-down rectifier . When the mains power fails, KA loses power and is released, and the light EL is powered by the battery
and
lights up.
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