Patent ID: 7589480

Claim:
A high intensity discharge lamp ballast circuit comprising: first and second lamp terminals operable to receive a high intensity discharge lamp between the first and second lamp terminals; a first inductor connected with the first lamp terminal; a first capacitor connected with the first inductor and the second lamp terminal; a second capacitor connected with the first lamp terminal; second and third inductors connected with the first inductor and the first capacitor; wherein the first, second and third inductors and the first capacitor connect at a common node, and wherein the second capacitor connects in parallel with the first and second lamp terminals; further comprising: a source of high voltage having a positive rail and a negative rail; a first switch connected between the positive rail and a first node, the second inductor connected between the first node and the common node; a second switch connected between a second node and the negative rail, the third inductor connected between the second node and the common node; and a controller for operating the first and second switches.