Improved small signal modeling and dynamic analysis of high step-up converter with charged pump and Boost converter

High step-up converter, which is constructed by the charged pump and Boost converter, is a good topology since it possesses a high voltage conversion ratio and a good and robust performance of regulation. This paper contributes to establish the improved small signal model of this high step-up converter and analyze its dynamical behaviors. By taking into account of the abruptly changing on the voltage across the charge pump capacitor and the relationship between the two inductor currents, the improved small signal model which overcomes the drawbacks of its existing small signal models is derived. Its input-to-output transfer function is obtained and validated preliminary by PSIM simulations. Finally, the circuit experiments are presented for confirmation.