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A single-stage high-power-factor (HPF) electronic ballast with a class-DE low dv/dt rectifier as a PFC has been proposed in this paper. The proposed is archived by using a bridge rectifier which acts as the class-DE rectifier. By using this topology the conduction angle of the bridge rectifier diode current can be increased then the low line current harmonic was obtained. The class-DE low dv/dt rectifier is driven by a high frequency sinusoidal current source, which an electronic ballast prototype operating 84 kHz has been implemented to drive 36-W fluorescent lamp. Experimental results verify the theoretical analysis. It is shown that the designed electronic ballast has 0.99 power factor, 1.3% total harmonic distortion, 1.32 lamp current crest factor and 90% efficiency at full power.