BIDIRECTIONAL NON-ISOLATION MULTI-PHASES DC-DC CONVERTER WITH IMPROVED DURABILITY PROPERTIES AND DRIVING METHOD THEREOF

摘要

The present invention relates to a bidirectional non-insulation multiphase DC-DC convertor with improved durability. According to the present invention, the DC-DC convertor performing bidirectional voltage conversion in a boost mode and a buck mode between a high voltage terminal and a low voltage terminal includes: a parallel convertor module forming a multiphase since multiple DC-DC convertor units are connected in parallel; and a switching control module generating a control signal for controlling operation timing of each DC-DC convertor unit forming the parallel convertor module. The DC-DC convertor unit includes: a pair of switching terminals alternately switched in the boost mode and the buck mode by responding to the control signal; an inductor connected to the pair of the switching terminals; and a current sensor sensing a current of the inductor. The switching control module digitizes usage frequency per DC-DC converter unit by using an accumulated current value per the operation mode of each DC-DC convertor unit and determines the operation order of the DC-DC converter units in order of low usage frequency. Therefore, the switching control module generates the control signal so that each DC-DC convertor unit is driven in order according to driving order.