PWM RECTIFIER HAVING TARGET VOLTAGE CORRECTOR BY ZERO SYSTEM VOLTAGE FOR REDUCING SWITCHING LOSSES AND PREVENTING NOISE GENERATION

摘要

The invention relates to a pulse-width modulated rectifier for reducing switching losses while avoiding noise generation, a target voltage system (UR.SoII. US.SoII. UT.SoII) being formed from a voltage spatial vector (IUI, arg(U)) and a zero voltage system ( Uo, Uo, Uo) being formed therefrom by means of the angle arg (U) and a control angle φ. The voltage system (UR, US, UT) resulting from the sum of the zero voltage system (Uo, Uo, Uo) and target voltage system (UR.SoII US.Soll, UT.SoII) is fed into a pulse width modulator 2 to form the control signals (SR, SS, ST) for the power semiconductor switch. First angular regions, for which a maximum zero voltage system (UO.MAX. UO.MAX. UO.MAX) is summed, and second angular regions, for which a minimum zero voltage system (UO.MIN. UO. MIN. UO.MIN) is summed, alternate over time at a frequency high enough that a first angular region in which the voltage values of a first phase of the resulting voltage system reach their maximum value is followed by a second angular region in which the voltage values of a second phase of the resulting voltage system reach their minimum value, and whereupon a first angle range follows in turn.