Patent ID: 8779674

Claim:
An electronic ballast circuit for a fluorescent lamp, comprising: a power circuit that outputs power to the lamp; the power circuit having: a rectifier for converting an alternating current input voltage into a direct current output voltage, and a circuit including a combined power factor correction (PFC) stage and an inverter; and an integrated power supply for a controller circuit; the integrated power supply providing start-up power to the controller circuit; and also providing steady state power to the controller circuit when the lamp is at full power and when the lamp is dimmed; and wherein a steady state power circuit of the integrated power supply provides the steady state power to the controller circuit; the steady state power circuit including an auxiliary winding associated with an inductor of the inverter; wherein the power circuit operates with only one switch; and wherein the integrated power supply receives a portion of output power from the power circuit and delivers the portion of the output power to the controller circuit.