Electronic ballast system having emergency lighting provisions
OwnerNicholas Buonocuntoinventor
Life of this patent
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Abstract
An electronic ballast system is disclosed for operating one or more fluorescent lamps having a subsystem with universal input from 108V to 305V, a battery, along with a battery charger and associated logic, that provides for emergency lighting, as well for operating at least one of the fluorescent lamps. The electronic ballast system includes a circuit that allows for a fluorescent lamp to be energized without the preheating of it cathodes, as well as includes a circuit for power factor correction that uses of an average current mode implemented by a pulse-width modulator to derive a power factor for the electronic power circuit that approaches unity.
Claims8
An electronic ballast system comprising:
- a) an EMI filter having an input connected to a source of excitation and an output for providing a filtered output therefrom;
- b) a full-wave rectifier having an input connected to said output of said EMI filter and an output for providing a rectified dc voltage;
- c) a power factor correction circuit having an input connected to said output of said full-wave rectifier and an output for providing a power factor regulated output therefrom;
- d) a first inverter ballast circuit having an input connected to said output of said power factor correction circuit, said first inverter ballast circuit having a first sweep frequency circuit for supplying an oscillating current to power a first fluorescent lamp, without the need for preheating said lamp;
- and
- e) an emergency inverter ballast circuit for supplying power to said first fluorescent lamp when said first inverter ballast circuit is disabled, without preheating said first fluorescent lamp.
An electronic ballast system for operating four fluorescent lamps, including a first fluorescent lamp, a second fluorescent lamp, a third fluorescent lamp and a fourth fluorescent lamp, said electronic ballast system comprising:
- a) an EMI filter having an input connected to a source of excitation and an output for providing a filtered output therefrom;
- b) a full-wave rectifier having an input connected to said output of said EMI filter and an output for providing a rectified dc voltage;
- c) a power factor correction circuit having an input connected to said output of said full-wave rectifier and an output for providing a power factor regulated output therefrom;
- d) four inverter ballast circuits including a first inverter ballast circuit operatively associated with said first fluorescent lamp, a second inverter ballast circuit operatively associated with said second fluorescent lamp, a third inverter circuit operatively associated with said third fluorescent lamp and a fourth inverter circuit operatively associated with said fourth fluorescent lamp;
- and
- e) an emergency inverter ballast circuit supplying power to one of said fluorescent lamps when said other fluorescent lamps are disabled without preheating said fluorescent lamp.
Dependencies are inferred from the claim text.