Abstract
This paper is concerned with the development of a digital power-factor (PF) meter to replace the electrodynamic type. A new method is chosen to perform a PF measurement ; it is baaed on voltage-to-frequency conversion and counting techniques. One voltage-to-frequency converter (VFC) is used to convert the two DC signals into frequencies proportional to Vm and Vm cos φ, where Vm is the peak of the voltage signal and φ is the phase angle between voltage and current. A division scheme is implemented to perform the digital PF measurement.
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