Vienna rectifier

A Vienna rectifier, also referred to as a three -phase, three -point pulsed rectifier, a rectifier circuit used in the electrical industry to convert three-phase alternating current into direct current. He belongs to the group of the controlled rectifier and was developed in 1993 by Johann W. Kolar at the TU Vienna.

General

The Vienna rectifier stands in contrast to the conventional use of three-phase six-pulse bridge circuit ( B6) by a much lower harmonic content in the AC side and supplies, if you will, a twice as high DC voltage. Due to the nearly sinusoidal current profile, a smaller mains filter and thus a smaller volume for the rectifier is necessary especially for larger benefits. The disadvantage is the time-consuming and the necessary electronic control circuit, which controls the rectifier by pulse width modulation (PWM).

Due to the PWM control of the rectifier, typically come in IGB transistors used, the DC output voltage can be controlled in certain areas. It is a form of space-vector modulation is applied. The power flow is in this rectifier only by the three-phase AC side to the DC side.

Applications are in the area as a compact replacement of the six-pulse bridge circuit and where else bulky mains filter to achieve a nearly sinusoidal current profile on the three-phase side are necessary. Which comprises, for example:

• Power supply units in Telekommunktionsbereich
• Uninterruptible Power Supplies
• Input stage for the control of DC motors.
• Wind turbines