Design a high-efficiency and high voltage gain DC-DC converter for photo voltaic systems

Renewable sources such as photovoltaic modules, fuel cells or energy storage devices, such as super capacitors or batteries provide an output voltage supply in the range of about 12-70 VDC. In order to connect grid systems, the voltage level must be adjusted in accordance with the rules of the electricity grid in the country. For applications such as attached to network systems, it is necessary to increase the voltage level resulting in reduced efficiency. To deal with this problem, this article proposes a new high-voltage gain, the DC-DC converter based on the high-efficiency inductor coupled, an intermediate condenser and the regenerative leak recovery system. The input power source is first stored in the inductor field and a capacitor coupled magnetic in an intermediate time loss. A passive retention network around the primary inductor ensures the recovery of the trapped energy in the leakage inductance, it leads to an improvement in the voltage gain and the efficiency of the system. It is necessary to increase the duty cycle values to obtain a high voltage gain, which avoids problems such as reverse diode recovery. Due to the presence of a passive voltage-locking network reduces the voltage on the switch. This allows the use of a low voltage switch (with a low “ON-state” resistance), improving the overall efficiency of the system.