A comparative study of several low voltage ratio DC-DC converters

• Main Author: De Jong, Erik Cornelis Wytze
• Published: 2011
• Subjects: DC-to-DC converters
• Online Access: http://hdl.handle.net/10210/4088

M.Ing. === The need for efficient, power dense, high frequency DC-DC converters is becoming more important in applications such as on board voltage regulation modules for low voltage microprocessors as well as the interconnection system of the two parallel DC-busses present in future automobiles. These applications have a few basic criteria in common, namely, that they exhibit a low voltage conversion ratio, demand a high power capability as well as a high power density and have no explicit need for galvanic isolation. For applications that fit this description, a new innovative conversion system is presented and critically evaluated against similar converters on the bases of efficiency and component rms currents. The comparison involves four such DC-DC converters, from which two are new topologies brought about by the new innovative system configuration. Generalised analytical results, alongside practically verified results, are presented for each converter topology. A detailed design also accompanies each converter topology. The results show that significant gain can be achieved from the new innovative conversion system above currently implemented DC-DC converters in the fields of switch and passive component rms currents as well as power density and efficiency. This gain is shown to come at the cost of increased complexity and the loss of galvanic isolation.