4. Conclusion
During the design of the present Micro-Inverter, specific ferrite cores were developed and tested to be used for the power inductors and the high frequency transformer, this material improves the system performances, efficiency and reduces its physical dimensions. A particular attention was also given to the cooling process of the main power electronic components used in the system such as power transistors, power diodes and regulators, the used cooling process is based on the development and use of a thermo electrical material with a specific doping and design.
The interleaved Boost chopper is an appropriate solution for PV modules with relatively low voltage and called to supply loads at high voltages. The implementation of this structure has reduced losses through the power components, to reduce the size and weight of magnetic circuits for operating in high frequency, introducing an impedance matching for harvesting optimal power and isolate electrically the PV from the load to protect it. The main obstacle of the circuit in Fig. 2 is its limited power regulation range. Inductor L1 must support input voltage when-ever Q1 turns on. Likewise, this is true for L2 and Q2. Since the minimum duty ratio of each switch is 0.5, the magnetizing currents of the two inductors cannot be limited. This leads to a minimum output power level. If the load demands less power than this minimum level, the output voltage increases abnormally because excessive energy has been stored in the inductors
