Retrofit emergency lighting system

专利名称：Retrofit emergency lighting system发明人：HERZOG; ROLLIE R.申请号：US41565373申请日：19731114公开号：US3906243A公开日：19750916

摘要：A retrofit emergency lighting system including a 60Hz AC ballast for operatingat least one gaseous discharge lamp. There is provided a means for substantiallyelectrically isolating the secondary side of the ballast transformer from ground therebyreducing the hazard of electrical shock during lamp replacement. The ballast

transformer is an isolation transformer having the secondary winding connected acrossthe lamp. A pair of filament windings are connected to the filaments of the lamp and arepositioned laterally with respect to the primary winding and in a pancake form so as toprovide low capacitance between the filament windings and primary winding. An invertercircuit, which is driven by a DC battery, is further connected across the lamp for operatingthe lamp during emergency conditions. The inverter circuit operates at such a frequencyso as to minimize capacitive leakage and inductive shunt current losses.

申请人：CONSTRUCTION MATERIALS, A DIVISION OF GENERAL ELECTRIC COMPANY

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