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US 7,095,185 B2Granted
Fluorescent lamp electronic ballast
AssigneeBruce Industries, Inc.
InventorsArthur T. Nemirow, Charlie C. Park
Life of this patent
Estimating the term…
Abstract
A fluorescent lamp electronic ballast includes a power factor correction flyback circuit and an inverter ballast circuit. The power factor correction flyback circuit is composed of a rectifier connected to a DC to DC flyback converter. The flyback converter includes a flyback transformer connected to a diode/capacitor combination. The flyback transformer is switched during operation to produce a flyback waveform that is rectified by the diode and results in a DC output at the capacitor. The inverter ballast circuit receives the DC output and converts the DC output to an AC signal for operating the flourescent lamp.
Claims11
A fluorescent lamp electronic ballast comprising:
- a power factor correction flyback circuit composed of a rectifier connected to a DC to DC flyback converter, the flyback converter including a flyback transformer connected to a diode/capacitor combination, the flyback converter including a switch used to switch the flyback transformer during operation to produce a flyback waveform that is rectified by the diode and results in a DC output at the capacitor;
- and
- an inverter ballast circuit receiving the DC output and inverting the DC output to an AC signal for operating the fluorescent lamp.
A fluorescent lamp electronic ballast comprising:
- a power factor correction flyback circuit composed of a rectifier connected to a DC to DC flyback converter, the flyback converter including a flyback transformer connected to a diode/capacitor combination, the flyback converter including a switch used to switch the flyback transformer during operation to produce a flyback waveform that is rectified by the diode and results in a DC output at the capacitor;
- and
- an inverter ballast circuit receiving the DC output and inverting the DC output to an AC signal for operating the fluorescent lamp;
- wherein the rectifier receives an AC input having a frequency that varies to frequencies exceeding 300 Hz.
1 more element
A fluorescent lamp electronic ballast comprising:
- power factor correction flyback circuit composed of a rectifier connected to a DC to DC flyback converter, the flyback converter including a flyback transformer connected to a diode/capacitor combination, the flyback converter including a switch used to switch the flyback transformer during operation to produce a flyback waveform that is rectified by the diode and results in a DC output at the capacitor;
- and
- an inverter ballast circuit receiving the DC output and inverting the DC output to an AC signal for operating the fluorescent lamp;
- wherein the rectifier receives an AC input having a frequency that varies primarily between 300 Hz and 800 Hz.
1 more element
A fluorescent lamp electronic ballast comprising:
- a power factor correction flyback circuit composed of a rectifier connected to a DC to DC flyback converter, the flyback converter including a flyback transformer connected to a diode/capacitor combination, the flyback converter including a switch used to switch the flyback transformer during operation to produce a flyback waveform that is rectified by the diode and results in a DC output at the capacitor;
- and
- an inverter ballast circuit receiving the DC output and inverting the DC output to an AC signal for operating the fluorescent lamp;
- wherein the inverter ballast includes a self-oscillating resonant circuit including a pair of power transistors, and the flyback converter is further used to create a DC bias for use by the power transistors.
1 more element
A fluorescent lamp electronic ballast comprising:
- a power factor correction flyback circuit composed of a rectifier connected to a DC to DC flyback converter, the flyback converter including a flyback transformer connected to a diode/capacitor combination, the flyback converter including a switch used to switch the flyback transformer during operation to produce a flyback waveform that is rectified by the diode and results in a DC output at the capacitor;
- and
- an inverter ballast circuit receiving the DC output and inverting the DC output to an AC signal for operating the fluorescent lamp;
- wherein the DC output is 28 VDC.
1 more element
A fluorescent lamp electronic ballast comprising:
- a power factor correction flyback circuit composed of a rectifier connected to a DC to DC flyback converter, the flyback converter including a flyback transformer connected to a diode/capacitor combination, the flyback converter including a switch used to switch the flyback transformer during operation to produce a flyback waveform that is rectified by the diode and results in a DC output at the capacitor;
- and
- an inverter ballast circuit receiving the DC output and inverting the DC output to an AC signal for operating the fluorescent lamp;
- wherein the rectifier has an input capacitance of less than 0.5 microfarads.
1 more element
A fluorescent lamp electronic ballast comprising:
- a power factor correction flyback circuit composed of a rectifier connected to a DC to DC flyback converter, the flyback converter including a flyback transformer connected to a diode/capacitor combination, the flyback converter including a switch used to switch the flyback transformer during operation to produce a flyback waveform that is rectified by the diode and results in a DC output at the capacitor;
- and
- an inverter ballast circuit receiving the DC output and inverting the DC output to an AC signal for operating the fluorescent lamp;
- wherein a ratio of a line input peak voltage to the reflected voltage is less than one.
1 more element
Dependencies are inferred from the claim text.