Interleaved continuous conduction mode power factor correction boost converter with improved modulated carrier control method

This paper proposes a new modulated carrier control for an interleaved continuous conduction mode (CCM) power factor correction (PFC) boost converter. The proposed method allows precise sinusoidal input current shaping for a PFC boost converter operating in CCM. This is accomplished by simply comparing the modulated carrier signal with the switch current sensing signal such that the inner loop current regulator and rectified line voltage sensing are not required. The proposed control method greatly simplifies current sensing and control circuitry of the parallel connected converters. The proposed control technique also enables simple current balancing between two converters by employing modulated carrier signals with the same amplitude for both converters. The detailed circuit operation and design consideration are discussed. The performance of the proposed control method is experimentally verified by a 600-W PFC converter.