New component for Inrush Current Limitation Circuit (ICLC)

摘要

During the start up of an AC/DC power supply, the high current can raise up to 50 times the nominal current of the system. This inrush current can create a voltage drop in the main supply that may affect the operation of any equipment connected to the same power network and blow up the input wire fuse as well. In order to control this effect and limit the inrush current intensity, the two most commonly found solutions are either for lower power systems, the use of stand-alone impedance before the rectifier bridge or the use of serial impedance at the input shorted by a pass element (SCR, Triac or relay). Unfortunately none of these solutions are fully acceptable and fulfill the ideal expectation of the inrush current limitation circuit (ICLC). Based on its advanced ASD™ technology, STMicroelectronics is proposing a new circuit configuration and the associated component, the STIL02, which closely meets the requirements mentioned above. This paper describes in detail this new circuit as well as the benefits brought by STIL02 and the ASD™ technology.