I. Introduction
Nowadays, the rapid electrification development of automobile propulsion systems has improved the environmental issues significantly, while also reducing the reliance on traditional fossil fuels for transportation. In the front stage of the propulsion system, a dc–dc converter is usually adopted to realize the conversion of the variable low voltage of battery to a constant high-level voltage, which serves as the input of inverter to drive the motor. Therefore, the voltage regulation ability is necessary for the dc–dc converter to adapt to the change of input and achieve the efficient and high-gain voltage conversion [1], [2], [3].