Circuite electronice pentru controlul încălzitorului electric catalitic, folosite în industria auto la controlul emisiilor / Electric heated catalyst controller design for automotive emission control

Automotive emissions have a great impact in the overall pollution. To minimize this impact, there are several technologies used, including electrical heated catalysts. These are especially important for vehicles with start-stop system and mild-hybrid vehicles. The power range necessary to heat up the catalyst is important. A solution for the electrical heated catalyst controller for 12V system is presented. For 48V systems, it is shown the necessity of a control with DC/DC converter, which will minimize the impact of load turn-on and turn-off. A design for such a system is presented, which uses a 2-phase DC/DC converter and GaN transistors. The impact of real components used in the design is discussed.