In particular, to reduce the operating
voltage of the filter by a factor k, the detected CM voltage has
to be divided by k and the injected compensating voltage has
to be multiplied by the same factor. Since a voltage-sensing
scheme usually adopts a detection system constituted by three
wye-connected capacitors Cd [26], a further capacitor C1 =
3Cd (k – 1) is used to detect a suitably divided CM voltage [24].
This calls for a voltage injection system with the capability to
multiply the compensating voltage by k. Since aCMtransformer
(CMT) is used for the voltage injection, a CMT with a turn ratio
1:k is realized. It should be observed that the turn ratio of the
CMT is obtained by the minimum turns number at the primary
winding, provided that the core saturation is avoided. In this
way, small dimensions of the CMT are possible and the desired
optimization of the power to size ratio is accomplished
In particular, to reduce the operating
voltage of the filter by a factor k, the detected CM voltage has
to be divided by k and the injected compensating voltage has
to be multiplied by the same factor. Since a voltage-sensing
scheme usually adopts a detection system constituted by three
wye-connected capacitors Cd [26], a further capacitor C1 =
3Cd (k – 1) is used to detect a suitably divided CM voltage [24].
This calls for a voltage injection system with the capability to
multiply the compensating voltage by k. Since aCMtransformer
(CMT) is used for the voltage injection, a CMT with a turn ratio
1:k is realized. It should be observed that the turn ratio of the
CMT is obtained by the minimum turns number at the primary
winding, provided that the core saturation is avoided. In this
way, small dimensions of the CMT are possible and the desired
optimization of the power to size ratio is accomplished
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