Abstract: To solve the problem of low voltage gain in traditional converters and achieve higher voltage gain, a high gain converter based on traditional quadratic converters is studied, which combines a coupled inductor with a switching capacitor voltage doubling unit. The converter replaces the single switch structure of the traditional quadratic converter with a double switch structure with clamp branches, coupled by coupling inductors and switch capacitors, significantly raising the converter’s voltage gain. It can also flexibly achieve high voltage gain by modifying the coupling inductance’s duty cycle and turn ratio. The clamp structure in this converter can constrain the voltage spikes brought on by leakage inductance resonance and parasitic capacitance, effectively reducing the voltage stress of the switching transistor. The proposed converter combines magnetic integration technology to decouple and integrate independent and coupled inductors, effectively reducing the number of magnetic components, reducing the volume of the converter, and thus saving the cost of the converter. The working principle of the proposed converter is described, the connection between the converter’s duty cycle and voltage gain is deduced, as well as the voltage stress of each device, and the parameters of the integrated magnetic components are designed and simulated. Finally, for experimental verification, a 180 W experimental prototype is constructed, and the measured efficiency of the converter is higher than 92%, which can be well applied in photovoltaic power generation systems.