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H. Ertl, J.W. Kolar:
"A Constant Output Current Three-Phase Diode Bridge Rectifier Employing a Novel "Electronic Smoothing Inductor"";
IEEE Transactions on Industrial Electronics, Volume 52 ( 2005), 2; 454 - 461.

This paper presents an improvement of the
well-known conventional three-phase diode bridge rectifier
with dc output capacitor. The proposed circuit increases the power
factor (PF) at the ac input and reduces the ripple current stress
on the smoothing capacitor. The basic concept is the arrangement
of an active voltage source between the output of the diode bridge
and the smoothing capacitor which is controlled in a way that it
emulates an ideal smoothing inductor.With this the input currents
of the diode bridge which usually show high peak amplitudes are
converted into a 120 rectangular shape which ideally results in
a total PF of 0.955. The active voltage source mentioned before
is realized by a low-voltage switch-mode converter stage of small
power rating as compared to the output power of the rectifier.
Starting with a brief discussion of basic three-phase rectifier
techniques and of the drawbacks of three-phase diode bridge recti-
fiers with capacitive smoothing, the concept of the proposed active
smoothing is described and the stationary operation is analyzed.
Furthermore, control concepts as well as design considerations
and analyses of the dynamic systems behavior are given. Finally,
measurements taken from a laboratory model are presented.
Index Terms-Active rectifier, dc-link supply, three-phase power
factor correction.This paper presents an improvement of the
well-known conventional three-phase diode bridge rectifier
with dc output capacitor. The proposed circuit increases the power
factor (PF) at the ac input and reduces the ripple current stress
on the smoothing capacitor. The basic concept is the arrangement
of an active voltage source between the output of the diode bridge
and the smoothing capacitor which is controlled in a way that it
emulates an ideal smoothing inductor.With this the input currents
of the diode bridge which usually show high peak amplitudes are
converted into a 120 rectangular shape which ideally results in
a total PF of 0.955. The active voltage source mentioned before
is realized by a low-voltage switch-mode converter stage of small
power rating as compared to the output power of the rectifier.
Starting with a brief discussion of basic three-phase rectifier
techniques and of the drawbacks of three-phase diode bridge recti-
fiers with capacitive smoothing, the concept of the proposed active
smoothing is described and the stationary operation is analyzed.
Furthermore, control concepts as well as design considerations
and analyses of the dynamic systems behavior are given. Finally,
measurements taken from a laboratory model are presented.
Index Terms-Active rectifier, dc-link supply, three-phase power
factor correction.

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