Electronic ballast

Details Electronic ballast Electronic ballast

H - Electricity

05

B

H05B 41/16 (2006.01)

Patent

CA 2059016

ABSTRACT ELECTRONIC BALLAST A circuit is disclosed to implement an energy saving electronic ballast for driving a fluorescent lamp or tube. The circuit is characterized by a high power factor, low harmonic distortion and minimized radio frequency interference. The circuit includes a unique DC power supply comprising a high pass filter, which receives an AC input signal, a diode bridge rectifier and a high speed diode rectifier which cooperates with the bridge rectifier to provide the power supply with first and second rectification stages. A current regulating capacitor for driving the fluorescent lamp or tube is connected to the DC power supply between the first and second rectification stages. A trigger and high frequency oscillator are provided after the second rectification stage of the power supply to provide the DC current necessary to operate the ballast circuit. 16

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