Novel start-up inrush current suppression circuit

A three-stage inrush-current suppression circuit is proposed to suppress the inrush current, which exits in the front-end AC/DC converter with boost topology. The proposed circuit not only can suppress the impulse current when powered on, but also can suppress the second inrush current caused by the working of the boost circuit. This paper analyzed the reason for the formation of the inrush current, and proposed a novel inrush-current suppression circuit. The simulations were done to prove the rightness and feasibility of the circuit and the circuit is used in a 1000 W two-stage electronic ballast for the metal halide lamp. In the experiment, the impulse current is nearly 0 and the second inrush current is less than 10A.