Advanced full bridge type delta-sigma modulated pulse space modulation PFC converter introducing current limiting scheme

This paper proposes an advanced delta-sigma modulated power factor correction (PFC) converter. The proposed circuit introduces pulse space modulation technique for a full bridge converter and can regulate input current as a sinusoidal wave together with high power factor operation. Also, because the proposed circuit has the feature of noise shaping characteristics, the circuit can reduce low frequency harmonics that are difficult to reduce by using conventional PWM modulation. Furthermore, introducing current limiting scheme, the proposed circuit can reduce switching device rating.