Patent ID: 9509211
Filing Date: 2016-11-29
CPC Classification: H02M,Y02B,Y02P

Claim Text:
1. A bridgeless power factor improvement converter, comprising: a pair of input terminals to which an AC voltage is input, the pair of input terminals including a first input terminal and a second input terminal; a pair of output terminals from which an output voltage is output, the pair of output terminals including a first output terminal and a second output terminal, the first output terminal having a positive potential relative to the second output terminal; a first rectifier having a first current input terminal and a first current output terminal, the first current output terminal being connected to the first output terminal; a first switch that is connected between the second output terminal and the first current input terminal; a second rectifier having a second current input terminal and a second current output terminal, the second current input terminal being connected to the second output terminal; a second switch that is connected between the first output terminal and the second current output terminal; a first coil that is connected between the first input terminal and a first node connected between the first rectifier and the first switch; a second coil that is connected between the first input terminal and a second node connected between the second rectifier and the second switch; a pair of series rectifiers that are connected in series in a forward direction via a third node and that have a third current input terminal and a third current output terminal that are opposite to each other, the third current output terminal being connected to the first output terminal, the third current input terminal being connected to the second output terminal, the third node being connected to the second input terminal; a capacitor that has first and second capacitor ends that are opposite to each other, the first capacitor end being directly connected to the third node, the second capacitor end being directly connected to one of the third current input terminal and the third current output terminal of the pair of series rectifiers so that the capacitor is serially connected between the third node and one of the third current input terminal and the third current output terminal of the pair of series rectifiers; a pair of output capacitors that are connected in series via a fourth node between the first and second output terminals; a resonance inductor and a first bidirectional switch that are connected in series via a fifth node between the third node and the fourth node; and a control circuit that switches the first and second switches according to the AC voltage, wherein when the first input terminal has a positive potential relative to the second input terminal, the control circuit switches only the first switch, and when the first input terminal has a negative potential relative to the second input terminal, the control circuit switches only the second switch.