Title :
Malfunction of a dead-time compensation in PWM-converters leading to a high DC current offset
Author :
Plotkin, Juriy ; Schaefer, Uwe ; Hanitsch, Rolf
Author_Institution :
Dept. of Drive Technol., Berlin Univ. of Technol., Berlin
Abstract :
A new source for the DC current offset in the PWM inverter-fed loads is found. A significant irregularity in dead time voltage compensation due to a very small offset in phase current measurement is the cause for it. In the phase currents and voltages, high DC offsets appear at low current magnitudes, which lead to a first torque harmonic in the drive. Recommendations how to avoid or compensate this effect are given in the paper.
Keywords :
PWM invertors; PWM power convertors; DC current offset; PWM converters; PWM inverter-fed loads; dead-time voltage compensation; phase current measurement; torque harmonic; Automation; Current measurement; Magnetic field measurement; Optical feedback; Production; Pulse width modulation; Pulse width modulation inverters; Time measurement; Torque; Voltage;
Conference_Titel :
Industrial Electronics, 2008. IECON 2008. 34th Annual Conference of IEEE
Conference_Location :
Orlando, FL
Print_ISBN :
978-1-4244-1767-4
Electronic_ISBN :
1553-572X
DOI :
10.1109/IECON.2008.4758137
