Bridgeless PFC converter with low common-mode noise and high power density

A power factor correction converter, comprising:

• a first power converter stage, comprising:
• a first boost inductor connected to an AC input terminal;
• a first switch circuit connected in series with the first boost inductor;
• a first series rectifier circuit having a junction node connected between the first boost inductor and the first switch circuit;
• and
• a second series rectifier circuit connected in parallel with the first series rectifier circuit and having a junction node connected to the first switch circuit;
• a second power converter stage, comprising:
• a second boost inductor connect to the AC input terminal and connected in parallel with the first boost inductor;
• a second switch circuit connected between the second boost inductor and the first switch circuit;
• and
• a third series rectifier circuit connected in parallel with the second series rectifier circuit and having a junction node connected between the second boost inductor and the second switch circuit;
• and
• an output capacitor connected in parallel with the third series rectifier circuit;
• wherein the first series rectifier circuit and the third series rectifier circuit comprise rectifying diodes having a fast reverse recovery characteristic, and the second series rectifier circuit comprises rectifying diodes having a slow reverse recovery characteristic.

A power factor correction converter, comprising:

• a first power converter stage, comprising:
• a first boost inductor connected to an AC input terminal;
• a first switch circuit connected in series with the first boost inductor;
• a first series rectifier circuit having a junction node connected between the first boost inductor and the first switch circuit;
• and
• a second series rectifier circuit connected in parallel with the first series rectifier circuit and having a junction node connected to the first switch circuit;
• a second power converter stage, comprising:
• a second boost inductor coupled to the AC input terminal and connected in parallel with the first boost inductor;
• a second switch circuit connected in series with the second boost inductor;
• a third series rectifier circuit having a junction node connected between the second boost inductor and the second switch circuit;
• and
• a fourth series rectifier circuit connected in parallel with the third series rectifier circuit and having a junction node connected to the second switch circuit;
• and
• an output capacitor connected in parallel with the fourth series rectifier circuit;
• wherein the first series rectifier circuit and the third series rectifier circuit comprise rectifying diodes having a fast reverse recovery characteristic, and the second series rectifier circuit and the fourth series rectifier circuit comprise rectifying diodes having a slow reverse recovery characteristic.