EMERGENCY LIGHT LIGHTING DEVICE

PURPOSE:To prevent the breakage of an emergency lighting inverter by detecting a power outage in emergency, and switching an ordinary lighting inverter o the emergency lighting inverter after its oscillation stops. CONSTITUTION:When power is fed from a commercial power source 1, the DC output is gen...

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1. Verfasser: KUMADA OSAMU
Format: Patent
Sprache:eng
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Zusammenfassung:PURPOSE:To prevent the breakage of an emergency lighting inverter by detecting a power outage in emergency, and switching an ordinary lighting inverter o the emergency lighting inverter after its oscillation stops. CONSTITUTION:When power is fed from a commercial power source 1, the DC output is generated by a rectifier circuit 6, and a judging circuit 23 closes the contact point of a switch 21 with the output of a power outage detecting circuit 20. A relay 22 is excited, the contact point is connected to the (b) side, a fluorescent lamp 9 is connected to an ordinary lighting inverter 4 side, and a battery 8 is charged. The output of the power outage detecting circuit 20 becomes 0 at the time of the power outage of the power source 1 in emergency, the inverter 4 oscillates during the discharge of a smoothing capacitor 3, an oscillation stop detecting circuit 24 continuously outputs the signal, the judging circuit 23 keeps the switch 21 closed, and the contact point of the relay 22 is kept on the (b) side. The switch 21 openes when the discharge of the capacitor 3 is completed. The relay contact point is connected to the (a) side, and the lamp 9 is connected to an emergency lighting inverter 11. The infiltration of high-frequency surges into an emergency lighting inverter 11 based on the dispersion of the switching timing of the contact point can be prevented.