| Abstract |
The paper deals with a DC/DC converter for automotive dual voltage systems. First, basic issues that relate to the introduction of such networks are discussed. After showing the basic configuration of a dual voltage electrical system for a passenger car, the most important requirements for a switched-mode 42V/14V DC/DC converter for such a system are presented. Then a design of a buck converter, rated for the output power of about 500W, is outlined. As the required power rating for this application is 1kW, various methods of increasing the output power are discussed and the choice of a parallel converter is justified. The following part of the paper presents some results of experiments. In particular, the efficiency of the 1kW converter reached 94.5%. The performance of the parallel converter was also tested in a slow temperature cycle over the range of -40 - +90°C. Finally, two EMC tests were performed, namely, Bulk Current Injection test and Conducted Emission on Power Supply Lines test. These were also passed successfully. |
