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This paper presents the circuit design of current-fed push-pull resonant inverters for cold cathode fluorescent lamps (CCFL). The current-fed push-pull resonant inverter acts as a sinusoidal current source to drive the nonlinear CCFL loads. The sinusoidal current source may be implemented with a center-tapped transformer and an inductor, or with a general transformer and two inductors. Both designs...
This paper presents a modified Valley-Fill (VF) ballast circuit to combine with a current fed resonant inverter as the power circuit for a high power factor VF electronic ballast. The original VF circuit permit input current conduction from 30° to 150°, and then from 210° to 330°. Due to this discontinuity, high total harmonic distortion (THD) results into the input current waveform. The modified...
This paper presents a class D series resonant inverter with a series capacitor and an auxiliary switch. A capacitor and a switch connected in parallel are added to the series resonant circuit in series, which regulates the output power without frequency modulation. The entire impedance is changed by the difference between the switching frequency and the two resonant frequencies. While the auxiliary...
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