Patent ID: 7211965
Filing Date: 2007-05-01
Classification: H05B,Y02B

Abstract:
1. A circuit for operating a high intensity discharge (HID) lamp, comprising: an H-bridge connected between a common terminal and a power line, said H-bridge having four field effect transistors (FETs), two of said FETs having a first terminal connected to the common terminal, said H-bridge being connected to the HID lamp at second terminals of said two FETs; and a control circuit connected to said H-bridge, said control circuit comprising a transformer having a primary winding connected between the common terminal and a power terminal and a secondary winding connected between the common terminal and the power line, and a current sense resistor connected in series between said secondary winding and the common terminal, the HID lamp being connected to the common terminal and to said second winding to sense a current across said current sense resistor.