Application of interleaved bridgeless boost PFC converter without current sensing

Interleaved bridgeless boost power factor correction (PFC) converter based on predictive control method without any current sensing is presented in this paper. Complicated control strategies including current sensing are used to obtain proper current sharing and current ripple minimization for interleaved type PFC converters which are more suitable than the conventional type PFC converters by virtue of the improving power rating and reducing input current ripple. The proposed predictive control method doesn't need to sample any current signals, only the samplings of the input voltage and the output voltage are required. The input current of the converter is computed based on the input and output voltages according to the switching operations. The duty cycle for next switching is predicted by using reference current signal obtained from the voltage loop compensator, computed input current and converter parameters. A prototype of interleaved bridgeless boost PFC converter controlled by a digital signal processor (DSP) board was established to show the related results.