Modular control of parallel isolated micro-converters dedicated to conversion network

In this paper, an original control method used to regulate a micro-converter is presented. A network of micro-converters is dedicated to photovoltaic or bio-battery power conversion applications. This network combines several micro-converters in parallel to provide a high output current. Each micro-converter (5V, 2A) use a multi-leg transformer with several coupled inductors. A modular approach for the control of each internal switching cell is chosen. It consists in an original masterless control method used to generate a perfect shift of the interleaved carrier phases using a self-alignment process, and to provide the balancing of the internal inductor currents. At last, the control of a micro-converter is implemented in an integrated circuit with a targeted 1MHz switching frequency.