Battery Guard for Emergency Lights

Published:2012/9/28 21:01:00 Author:muriel | Keyword: Battery Guard, Emergency Lights | From:SeekIC

As the name implies,emergency light is a source of light available during an emergency.It is an automatic system in which a rechargeable battery operated light source turns on as soon as the ac mains fail.When the grid supply is restored,the lamp is turned off. An emergency light essentially consists of a source of electricity – a rechargeable battery pack and an automatic sensing circuit to check the presence(or absence) of mains supply.The sensing circuit connects a lamp (or a compact fluorescent tube inverter) circuit in the event of mains failure and disconnects it when the mains supply is restored.When ac mains supply is available,a charger circuit charges the battery pack to keep it in top condition(fig 2). Emergency Lights Guard Circuit Diagram Over the years,emergency lights have become better designed and more reliable. However, they retain a few weak facilities. Usually 6 volt sealed maintenance free (SMF) batteries are used in portable emergency lights. Unfortunately, many low cost lights give no indication when the battery has gone flat, so that there is a risk of the battery failure. Only high-end systems have built in electronic deep discharge protection circuitry to disconnect the output load in case the battery voltage happens to fall below a safe value.



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