BRIDGELESS PFC POWER CONVERTER WITH REDUCED EMI NOISE

摘要

A bridgeless PFC boost converter has either a single switching cell or two identical switching cells configured to operate 180 degrees out of phase. A switching cell includes first and second transistor switches coupled to opposing ends of an input AC voltage source, and first and second rectifying diodes, one rectifying diode coupled in series to each of the two transistor switches. A boost inductor is coupled to a junction node between each transistor switch and rectifying diode series. Either a third rectifying diode or a third transistor switch is coupled to a junction node between the input AC voltage source and the first transistor switch. Either a fourth rectifying diode or a fourth transistor switch is coupled to a junction node between the input AC voltage source and the second transistor switch. The rectifying diodes are coupled an output capacitor. Two switching cells can be interleaved.

主权项

1. A bridgeless power factor correction boost converter comprising:
a. a first transistor switch coupled to a first terminal of an AC voltage source; b. a second transistor switch coupled to a second terminal of the AC voltage source; c. a first diode comprising an anode coupled to the first transistor switch; d. a second diode comprising an anode coupled to the second transistor switch; e. a boost inductor comprising a first terminal coupled to the anode of the first rectifying diode and to the first transistor switch, wherein the boost inductor further comprises a second terminal coupled to the anode of the second rectifying diode and to the second transistor switch; f. a third diode comprising a cathode coupled to the first terminal of the AC voltage source; g. a fourth diode comprising a cathode coupled the second terminal of the AC voltage source; and h. an output capacitor comprising a first terminal coupled to a cathode of the first diode and to a cathode of the second diode, wherein the output capacitor further comprises a second terminal coupled to an anode of the third diode and an anode to the fourth diode.