Multi-topology DC/DC Converter KIT design and development

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Dr. Balogh Attila
Department of Automation and Applied Informatics

Silicon Laboratories keeping up with the continually developing Power over Ethernet (PoE) standard came out with its latest Si34061 chip in the spring of 2018. After the communication required by the PoE standard, the chip functions as a controller for a DC/DC converter. Until now, only an evaluation board based on the Flyback topology was available as a reference design, but with the continual increase in the maximum allowed power level, the use of other topologies with the chip could improve efficiency.

In the following thesis a DC/DC converter prototyping board was designed, which can be used to test the operation of different topology converters controlled by the Si34061 chip. The designed circuit follows a modular construction, which enables fast exchange of the different functional stages of the converter, and by that speeding up the development. 11 PCBs had been designed altogether, able to implement different types of one and two switch Flyback or Forward topologies. The board system is universal, so many other topologies can be implemented as well, only the needed stages have to be designed.

First, an exact replica of the existing 30 W Flyback evaluation board was implemented on the board and compared to the original one. After being assured of the correct operation of the board, a one switch Forward converter was designed and implemented on the board. With its continuous development, better efficiencies were reached compared to the Flyback, thus making the idea of a new, Forward topology based evaluation board reasonable.


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