Patent ID: 8575849

Claim:
A driver circuit comprising: a rectifier circuit configured to receive an AC input voltage and provide an unregulated DC voltage; an inverter circuit having a first switch and a second switch, the inverter circuit configured to receive a first gate control signal and a second gate control signal to open and close the first switch and the second switch, respectively, to generate a resonate AC signal from the unregulated DC voltage; a transformer comprising: a primary winding coupled to the inverter circuit; a secondary winding configured to be coupled, through an output stage circuit, to a solid state light source; and a feedback winding; a power factor correction circuit configured to control the inverter circuit in response to a first signal representative of the unregulated DC voltage and a second signal representative of current through the inverter circuit; and a frequency control circuit configured to generate the first gate control signal and the second gate control signal to control a switching frequency of the inverter circuit in response to a third signal representative of current though the output stage circuit and a fourth signal representative of current through the feedback winding.