Patent ID: 7633233

Claim:
An apparatus, comprising: an inverter configured to generate a secondary voltage, wherein the secondary voltage is generated, by a switch configured to convert a direct current input into an analog current output; a multiplexer coupled to the inverter and configured to receive a feedback signal sensed from the secondary voltage; an analog-to-digital converter coupled to the multiplexer and configured to convert the feedback signal into a digital feedback signal; and a pulse width modulator coupled to the analog-to-digital converter and configured to drive the switch with a pulse width modulated signal based, on the digital feedback signal, wherein the pulse width modulated signal is configured to control the secondary voltage, wherein the pulse width modulator is further configured to provide a pulse width modulated signal to one or more lamp control circuits, wherein the pulse width modulated signal is switched on and off at a determined duty cycle to alter an impedance of the one or more lamp control circuits.