Coupled inductor quadratic high-gain DC-DC converter

Abstract

Abstract To address the issue of the relatively low voltage gain in traditional Boost converters, this article employs magnetic coupling technology to integrate the quadratic boost circuit with the switched-capacitor voltage-doubling unit, thereby presenting a new high-gain DC-DC converter topology. This topology is capable of attaining a high voltage gain through the adjustment of the coupled inductor’s duty cycle and turns ratio. The clamping circuit allows for the recovery of leakage inductance energy, the suppression of voltage spikes, and the decrease of voltage stress on power devices. When the converter inductor current is in the continuous conduction mode (CCM), the working principle and modes are examined, and the device stress and voltage gain are deduced. In comparison with similar converters, the proposed converter’s advantages of high gain and low stress are demonstrated. Eventually, a 200W experimental prototype is fabricated to confirm the theoretical analysis’s accuracy and the circuit’s feasibility.