The present disclosure introduces a simple method and apparatus for
converting DC power to AC power, and, specifically, to single-ended
inverter circuits for driving discharge lamps such as a Cold Cathode
Fluorescent Lamp (CCFL) or an External Electrode Fluorescent Lamp (EEFL).
Among other advantages, these circuits offer nearly symmetrical voltage
waveform to drive discharge lamps when the duty cycle is close to 50%.
They also eliminate the high current and high voltage resonant capacitor
on the primary side, and reduce the voltage rating of a primary switch to
twice the input voltage without the need for snubber circuits. The
recommended inverters can be used to efficiently drive discharge lamps at
low cost, particularly for applications with a narrow input voltage
range. The lamp current can be regulated through the duty cycle
modulation of the main switch.