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A new step-up DC-DC converter is presented, based on quasi-Z-source network intended for photovoltaic applications. The proposed converter combines voltage multiplier cells to the secondary winding of the coupled inductor which is included in the second inductor of the quasi-Z-source network. In the output of the quasi-Z-source network, a switched capacitor is connected. This converter shows attractive characteristics such as high voltage gain, low voltage stresses on their components, continuous input current. A detailed description of the operating principles of the proposed converter is presented and experimental results on a 250 W prototype show that a high efficiency above 91.4% can be achieved.