Power factor correction system

摘要

A power factor correction system is comprised of a inductor and a forward transformer. The inductor is connected to the first winding of the forward transformer. In series. The inductor is used to boost the input voltage to the design level and correct input current waveform. The forward transformer is used to prevent the large reversed current through rectifier diode and the switch. The second winding of the forward transformer is used to receive the energy through the first winding of the forward transformer to correct input current waveformer and the third winding is used to reduce the switch voltage stress.

主权项

1. A power factor correction system comprising:
a bridge rectifier with output terminals and input terminals for receiving an AC power signal; a first capacitor coupled to the outputs of the bridge rectifier; a second capacitor; a third capacitor with a positive terminal and a negative terminal; a first inductor with its one terminal connected to the positive output of the bridge rectifier; the first inductor and the second capacitor being connected in series and then being coupled to the output terminals of the bridge rectifier; a second inductor; a first diode; the first inductor, the first diode and the third capacitor being coupled in series and then being coupled to the output terminals of the bridge rectifier; the cathode of the first diode being connected to the positive terminal of the third capacitor; a second diode; a third diode; a fourth diode; a forward transformer with three windings: a first winding, a second winding and a third winding; the second winding of the forward transformer and the third diode being connected in series and then being connected to the second diode in parallel; the second inductor, the second diode and the third capacitor being connected in series and then being coupled to the output terminals of the bridge rectifier; the cathode of the second diode being connected to the positive terminal of the third capacitor; the third winding of the forward transformer and fourth diode being connected in series and then being connected to the third capacitor in parallel; a switch with a first terminal, a second terminal and a control terminal; the control terminal being coupled to the control circuit unit; the first inductor, the first winding of the forward transformer and the switch being connected in series and then being coupled to the output terminals of the bridge rectifier; the second terminal of the switch being coupled the negative output terminal of the bridge rectifier.