Research on Constant-power Control technology of the Electronic Ballast for HPS Lamps

In order to meet the need of modern green lighting,this paper presents a three-stage structure of the electronic ballast to take place of the inductance ballast,describes the constant-power control circuit of the second stage,the paper designs a low-end mode Buck circuit by using the UC3842,analyzes the operation principle of a novel feedback circuit,educes the equations,realizes the constant-power control of the electronic ballast,and shows the experimental result.