A modular, laminar 42/14 V DC/DC converter concept with integrated thermal busbar

The dual 42 V-14 V automotive powernet provides an opportunity for a high volume application of power electronics. To meet the needs of this market, namely low cost on one and stringent temperature and size requirements on the other side, we propose a modular packaging concept. The basic module is engineered to have good thermal management and to use existing technology platforms that lend themselves to mass production. The salient feature of the module is integrated thermal busbar, a heat path common for both power semiconductors and passive components. In addition, this busbar provides electrical interconnection and mechanical support for the module, as well as a part of the inductor winding. A number of modules are then connected in parallel in order to achieve the desired power rating.