Today, the use of solar panels to produce electricity as a substitute of fossil fuels is very significant. However, due to the limitations of photovoltaic (PV) panels, it is not possible to directly transfer their power to the power grid. Therefore, the use of an interface alongside PV panels is required to overcome these limitations. AC module, which includes a PV panel and a single phase inverter, is based on some advantages such as improved energy harvesting capability, reduced production and installation costs, high flexibility and the possibility of extending the system due to the modularity has attracted the attention of both the industry and researchers. In contrast to some these advantage, AC modules have some drawbacks such as inherent power ripple at twice the output frequency, which cause power ripple on the panels and reduces the absorption of maximum power from the panel. The use of capacitors in parallel with panels is the simplest solutions to reduce the power oscillation, but due to the limitation of the acceptable maximum voltage ripple across the PV panels, electrolytic capacitor should be used. On the other hand, the electrolytic capacitors have a low lifetime compared to other parts of the AC module. Therefore, extensive research is done to reduce this capacitance to use high-quality, capacitors with longer life-time. In this thesis, an exact analysis of power ripple and the review of some methods and converter topologies to reduce the power ripple without electrolytic capacitors are performed. Then, a new micro-inverter based on current source inverter with some advantages such as minimum number of elements, passive reduction of the power ripple without any additional control and without any additional elements to reduce the power ripple, inherent protection against short circuit and open circuit is proposed. The operation of the proposed structure and its design method is investigated. The effectiveness of the proposed inverter is verified thorough simulation and experiments results. Then, by adding a new switch and changing the position of the inductor in the first proposed structure, the second topology is introduced. The second topology has the benefits of the first proposed inverter while the leakage current is reduced, which is another challenge in AC modules. The operation of the second proposed structure is explained and its design procedure is discussed. The effectiveness of the second proposed inverter is verified thorough simulation and experiments result. Finally, a new 2-stage micro-inverter is proposed. One of the most important features of this proposed structure is its control simplicity due to the fact that the converter duty cycle stays constant while receiving the maximum power from the panel. As a result, common control methods which are used for single-phase inverters such as sinusoidal pulse width modulation (SPWM) can be employed in this converter. Another feature of this proposed structure is the removal of the low-frequency current ripple of the panel, which improves system maximum power receiving capability as well as reducing the panel filter capacitor. Key word: 1. Micro-inverter 2. AC module 3. Power decoupling