| 摘要 |
PROBLEM TO BE SOLVED: To suppress generation of noise while avoiding complication of switching control to switches.SOLUTION: A bridgeless power factor improvement converter comprises: input terminals 2a and 2b to which an AC voltage Vac is input; output terminals 3a and 3b from which a DC voltage Vdc is output; diodes 4 and 6; a first switch 5; a second switch 7; a first coil 8; a second coil 9; a pair of series diodes 10 and 11; and a control circuit 15 that switches only the first switch 5 in a time period during which a voltage at the input terminal 2a becomes positive to the input terminal 2b, and that switches only the second switch 7 in a time period during which the voltage of the input terminal 2a becomes negative to the input terminal 2b. A separate parallel capacitor 12 is connected in parallel to the series diode 10, and a separate parallel capacitor 13 is connected in parallel to the series diode 11. |
