Quadratic High Step-up DC-DC Converter With Passive Clamp Circuit

abstract-This paper presents a quadratic high step-up DCDC converter incorporating a coupled inductor (CI), a passive clamp circuit and a voltage multiplier cell (VMC). This converter operates based on parallel charging of capacitors by CI and series discharging of this energy at the output. Moreover, the converter includes a diode-capacitor clamp circuit to decrease the voltage stress on the active switch and the output diode. As a result, this converter has high voltage gain (VG) and low voltage stress on switches, which is appropriate to increase the output voltage in photovoltaic panels. Since the proposed converter reduces voltage stress on the active switch, a switch with low resistance is utilized, which is improving power efficiency. The presented converter is analyzed in continuous conduction mode (CCM), discontinuous conduction mode (DCM) and steady-state. The experimental results relevant to the presented converter is verified with a $300 \mathrm{~V}-90 \mathrm{~W}$ prototype.