Abstract

A high power density integrated electronic ballast for low wattage high intensity discharge (HID) lamp based UCC3305 is proposed in this paper. The UCC3305 integrates all of the functions required to control and drive one HID lamp. A highly efficient and reliable topology full-bridge inverter is adopted to supply the lamp with low-frequency square-wave positive and negative current avoiding acoustic resonances. The UCC3305 special microcontroller for HID ballast is used to raise control performance and simplify the control circuit. The presented circuit was verified with experimental results. A prototype of 35W digital HID ballast has been built with the whole efficiency of 89%.

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