DESIGN OF A BUCK CONVERTER TO SUPPORT 42/14V AUTOMOTIVE BUS ARCHITECTURE USING PEAK CURRENT MODE CONTROL

摘要

The increased load demand on the automotive bus due to a large number of sub-systems such as Safety, Engine, Infotainment and so on in cars has prompted researchers to consider a higher system bus voltage. The complete transformation of bus voltage from existing 14V to 42V will not happen in a single cycle. So 42V/14V dual power supply systems will remain in the mainstream in the near future. Buck converter is an effective way for feeding loads which require 14V supply on 42V automotive bus architecture. This paper discusses a cost effective buck converter circuit design operating in continuous current mode. This new approach uses the Peak Current Mode (PCM) control method that enhances the transient response of the circuit because of its two feedback loops. This paper describes the transfer function along with the small signal circuit of the current controller. It also describes the procedures to ascertain the robustness of the design using, Saber.