Effective transformation of electricity has a wide scope of application and presents a current problem in enhancing energy efficiency. The paper examines innovative solutions for the realization of DC / DC and AC / DC electronic power converters, which can be used of the supply of quality electricity to different consumers, including those consumers which used of renewable energy sources. The performance of the proposed solutions is based on the transfer of energy at high frequency from the primary source to the load. Converters use fly-back and forward mode. It is proposed of the simplified topologies of converters with intermediate energy accumulation in the magnetic fields of the high frequency transformer, in external inductance and / or in electrical field of the capacitance. The transistors have soft switching type ZVS (zero voltage switching). The AC / DC converter ensures the stabilization of the output voltage and the compensation of the power factor. Brief descriptions of the samples of the converters manufactured are given. The proposed converters have the 9698% efficiency, a power density of to 20 kW / dm³ and a simple topology of the electrical scheme.