To provide an AC-DC converter capable of controlling an input current to a sine wave with the same phase as an AC voltage when a power frequency changes.
A control circuit 20 includes a power supply period calculation section 23 which calculates a period T of an AC voltage based on the time between zero points detected by a zero-point detection circuit 11; an angular frequency calculation section 24 which calculates an angular frequency ω of an AC voltage based on the period calculated by the power supply period calculation section 23; a power supply phase calculation section which calculates a phase θ of an AC voltage based on a time between zero points and an angular frequency ω; and a driving signal generation section 28 which generates a driving signal based on the phase θ, the angular frequency ω, an AC voltage detected by a power voltage detection circuit 9 and a DC voltage detected by a DC voltage detection circuit 10.
KAJIMA MITSUO
FUKUDA MASAHIRO
| JP2008099512A | 2008-04-24 | |||
| JPH09149646A | 1997-06-06 |
| WO2010013344A1 | 2010-02-04 | |||
| WO2009028053A1 | 2009-03-05 |
Kiyoshi Yasushima
Takanashi Norio
Motoki Shandong
Taku Ogawa
Murata Kensei
Moto Otani
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