Patent ID: 8344634

Claim:
A lamp driving apparatus, comprising: a switch module, comprising a high side transistor switch and a low side transistor switch connected in series between an input power source and a common level; a controller, adapted to control the high side transistor switch and the low side transistor switch for controlling power of the input power source transmitted through the switch module; a resonant module, coupled to the switch module and converting the power from the input power source into an AC output signal so as to drive a lamp; a level shift circuit, coupled to the controller, the switch module and a level shift voltage, and generating a high side control signal according to a voltage level of a connecting node of the high side transistor switch and the low side transistor switch, the level shift voltage, and a control signal generated by the controller so as to control the high transistor switch; and a phase adjustment circuit coupled between the controller and the level shift circuit, wherein the phase adjustment circuit adjusts the control signal so that a phase difference between the high side control signal and the control signal is equal to a predetermined phase difference value.