Patent ID: 6930898

Claim:
A single-stage backlight inverter for driving one lamp through one transformer using a predetermined pulse width modulation (PWM) oscillation signal, comprising: a main oscillator for generating a predetermined triangle-wave oscillation signal, a predetermined clock signal and an inverted clock signal; an output drive controller responsive to said triangle-wave oscillation signal, clock signal and inverted clock signal from said main oscillator and first and second reference voltages set therein, said second reference voltage having a level set to an intermediate level of said triangle-wave oscillation signal, said output drive controller generating a first voltage having a level set to a value between the level of said second reference voltage and a lowest level of said triangle-wave oscillation signal, comparing the generated first voltage with said triangle-wave oscillation signal, generating a first drive control signal in accordance with the comparison result, generating a second voltage having a level set to a value between said level of said second reference voltage and a peak level of said triangle-wave oscillation signal, comparing the generated second voltage with said triangle-wave oscillation signal, and generating a second drive control signal in accordance with the comparison result, said first and second drive control signals having different switching ON times; a first output unit for outputting a pair of first switching signals in response to said first drive control signal from said output drive controller, said first switching signals having a predetermined dead time therebetween; and a second output unit for outputting a pair of second switching signals in response to said second drive control signal from said output drive controller, said second switching signals having a predetermined dead time therebetween.