Improvements Through Forward Power Transfer in an Isolated Flyback Boost Converter for Solar Applications

The concept of distributed renewable energy systems brings with it the need for further research in power electronics. The use of local solar energy, with technologies such as microinverters and micro-optimizers, implies the need to raise voltages to adapt them to a distribution bus from which the rest of the elements operate. In this work, the resonant behavior of a forward-flyback boost is studied, which allows to obtain a higher energy density than in a conventional flyback. For this purpose, an exhaustive comparison is made in terms of energy between both proposals, showing how the addition of a forward behavior improves the performance. In addition to the theoretical comparison, a converter is made to operate under the same conditions transferring only energy in flyback mode as well as in forward-flyback mode. This demonstrates how higher power density can be obtained thanks to forward transfer through capacitors, devices with better energy density.