Design of a Two-Switch Forward Converter with Master-Slave Active Current Sharing Controller using a Digital Signal Processor

Switch mode power supplies (SMPS) such as two-switch forward converters are widely used direct current to direct current (DC to DC) post-converters because of its many advantages and its reliable operation. In this paper, the two-switch forward converter topology was used as basis for the current sharing technique while being controlled by a digital signal processor (DSP). A single DSP will be used in controlling the plant and the current sharing technique. This is to allow the use of lesser component count as well as verify the performance of the DSP when in controlling SMPS running with current sharing. The prototype converter is a 350W converter with input ranging from 320V to 390V with 12V output. Active current sharing technique was used when connecting the supplies in parallel. Current sharing of the converter is limited to converters with the same specifications and topology.