Abstract: This paper introduces and analyzes the principles and structure inside the high-voltage generator, and for the first time proposes the viewpoint that using an inverter to increase the inverter frequency can enhance the imaging performance of the digital radiography (DR) system. The theoretical basis for using an inverter to increase the inverter frequency to eliminate ripple is analyzed. Considering the characteristics of ripple, a pulse width modulation (PWM) inverter circuit based on insulated gate bipolar transistor (IGBT) is designed to suppress the ripple generated inside the high-voltage generator. For the first time, detective quantum efficiency (DQE) is introduced to quantitatively analyze the DR imaging performance before and after the installation of the inverter, in order to verify whether the addition of the inverter frequency module has improved the imaging performance.