Comparison of push-pull and half-bridge resonant inverters for cold cathode fluorescent lamps

This paper compares a push-pull resonant inverter with a half-bridge resonant inverter for cold cathode fluorescent lamps. The push-pull resonant inverter is fabricated with an input inductor, a center-tapped transformer, a parallel resonant capacitor and two bipolar junction transistors, whereas the halfbridge resonant inverter comprises a series resonant capacitor, a transformer and two metal-oxide-semiconductor field-effect transistors. Nevertheless, both inverters behave zero-voltage-switching and current-output characteristics. This paper depicts the features and compares the efficiency of the inverters with experiments. The experimental results show the voltage-fed half-bridge resonant inverter exhibits a better efficiency than the current-fed push-pull resonant inverter.