Improved quadratic boost converter using cross coupled-inductor

Based on the concept of the conventional quadratic boost converter, an improved topology is presented in this paper. In this design, a coupled-inductor will be utilized to increase the voltage gain of the circuit. The most significant advantage of this converter design is that the circuit has a high step-up ratio with a very low voltage stress on the switch. Moreover, this circuit utilizes minimum additional component to improve the converter performances. The inductor selection of this converter design is to ensure working in continuous-current mode (CCM) for various load conditions. Detailed circuit operation principle and theoretical voltage conversion ratio is derived. Finally, converter prototype was built to verify that using different coupling ratio can achieve high step up voltage gain capability.