Back-up electrical system for lamps

Details Back-up electrical system for lamps Back-up electrical system for lamps

H - Electricity

02

J

315/23, 315/65

H02J 9/04 (2006.01) H02J 9/06 (2006.01) H05B 37/03 (2006.01)

Patent

CA 1320247

A B S T R A C T A backup power system is provided for fluorescent lamps which energizes one of the lamps when normal AC mains power is not available. The circuit operates with a standard fluorescent fixture which contains two or more fluorescent lamps. When AC mains current is available, both lamps are operational so that the lighting fixture produces a maximum brightness. The AC mains current also trickle charges a low voltage battery contained in the lighting fixture. When main current is not available, the battery maintains only one of the lamps lighted. Consequently, although the lighting fixture produces a reduced output, the battery life is extended. In one embodiment both fluorescent lamps are powered directly from the AC line. When AC power is not available, a relay disconnects the AC line from both lamps and connects one lamp to a DC/AC inverter which is powered by the internal battery. In another embodiment, one lamp is powered directly from the AC line and the other lamp is powered by a DC/AC inverter which receives power either from a DC power supply operating off the AC line or from the internal low-voltage battery. In a third embodiment, during normal operating conditions, both lamps are powered by separate DC/AC inverters driven from a power supply that operates off the AC line. When the AC voltage is not present, the DC/AC inverter for one lamp is powered by the internal low-voltage battery.

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