Sanja Mandić, Dragan Pejić, Đorđe Novaković, Marjan Urekar, Platon Sovilj
Phase measurement methods based on timer modules
In this article, the methods of measuring the relative phase difference between two simple periodic signals, based on timer modules, are considered, with an analysis of a measurement system, its following problems, and proposed solutions. The basic motivation for this research is the necessity for a very precise and accurate measurement of the relative phase difference between the voltage signal and current signal of a two-channel source, when there is a degradation of the phase in the output stage of a twochannel source. To compensate for the deviation of the measured and real phase angle of voltage and current at the output of a two-channel source, phase measurement can be realized with timer modules. This approach requires the conversion of relatively high voltage and current into periodic pulse (rectangular) waves compatible with working with timer modules, and this conversion is achieved by utilizing comparators. Although the timer approach gives excellent results in measuring time intervals, they are rarely applied in phase measurement due to several important problems that appear during the conversion of analog signals into digital signals - the impact of analog noise, an offset of the comparators, as well as asymmetric low-pass filters intended for noise reduction.