Active Power Line Filters for Switching Power Supplies
نویسنده
چکیده
This paper analyses two schemes of single-stage diode-switched active filters used in new switching power supplies designs to improve the power factor. From the point of view of the power flow, the distortion reduction is based on the improvement of the power conversion processes. Most of the ca/cc switching power supplies consists of two separated parts: a rectifier – in most cases a diode bridge, and the converter itself. In the diode rectifiers with capacitive smoothing of the output voltage, considerable harmonic reduction can be achieved by converting the second-harmonic power in singlephase rectifiers and the third-harmonic power in three-phase rectifiers into an additional quantity of dc power. This promising trend is implemented using the diode-switched-inductor and the diode-switchedtransformer filter stages. A second harmonic or third harmonic series resonant filter can ensure a quasisinusoidal operation mode with a power factor up to 0.995.
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