Title :
Noise reduction in zero crossing detection by predictive digital filtering
Author :
Vainio, Olli ; Ovaska, Seppo J.
Author_Institution :
Signal Process. Lab., Tampere Univ. of Technol., Finland
fDate :
2/1/1995 12:00:00 AM
Abstract :
A simple combination of nonlinear and linear digital signal processing methods is proposed for efficient noise reduction in zero crossing detectors. The method is very robust against strong impulsive noise, typically encountered in thyristor power converters, where reliable zero crossing detection is required for firing synchronization. A systematic design procedure is described for the proposed filter-based synchronization method, taking into account the specified line frequency tolerance. The fully digital signal processing approach allows compact implementations, and supports flexible interfacing to digital motor control systems
Keywords :
digital filters; interference suppression; signal processing; synchronisation; thyristor convertors; digital motor control systems; firing synchronization; line frequency tolerance; linear digital signal processing; noise reduction; nonlinear digital signal processing; predictive digital filtering; thyristor power converters; zero crossing detection; Band pass filters; Detectors; Digital filters; Digital signal processing; Filtering theory; Finite impulse response filter; Frequency; Noise reduction; Nonlinear filters; Thyristors;
Journal_Title :
Industrial Electronics, IEEE Transactions on
