ABSTRACT In this paper, a multiphase high step‐up interleaved converter is introduced, which ensures low‐input current ripple, low‐component currents, and voltage stresses. The proposed circuit guarantees ZVS operation for power switches and ZCS operation for power diodes, which significantly reduce converter switching losses and EMI emission and improve its efficiency. Therefore, its passive components volume can be reduced by using high switching frequencies. In addition, the interleaved technique reduces input current ripple and input filter volume and provides high‐power density. High‐voltage gain and low‐voltage stresses on the components are also achieved due to the integration of the converter structure with the diode–capacitor voltage multiplier (VM) circuit, which makes it possible to use low‐voltage rating switches, diodes, and capacitors. The operation of the VM capacitors as resonant capacitors is another feature of the proposed converter that distinguishes it from similar structures. This feature eliminates the need for an independent resonant tank to enable soft‐switching conditions. Two series‐connected capacitors in parallel with the load are used to reduce their voltage stresses. Another feature of the proposed converter is its expandability, both on the input side and in the VM circuit. All the above‐mentioned features make the proposed converter suitable for a wide range of applications. This converter is mathematically analyzed, simulated, implemented, and tested under various conditions to verify its performance.