In this paper, closed loop integrated three-level ac-dc converter is presented in order to improve the stability of the system. By implementation of PI controller with PWM technique in closed loop, the switching sequence is under controlled condition and the output voltage of the proposed converter effectively increases. Mainly the present converter is combination of the operation of boost power factor correction and three-level dc-dc converter. Two large capacitors are taken in order to improve the efficiency and accuracy of the ac-dc converter. This converter operated with two different controllers. Power factor correction and regulation of dc bus voltage was done by input controller. The output voltage is maintained by output controller. In this we are using single stage converter topology in which the dc bus voltage in single stage converter is controlled by input controller. Finally in this paper we are maintaining the stability of the previously implemented three-level integrated ac-dc converter. The flexibility of the improved converter is obtained from simulation results by using MATLAB/Simulink.