DUAL BAND CURRENT PROBE FOR SMART ENERGY METERING APPLICATIONS

Abstract

This paper presents a specialized current probe for implementation into smart energy metering devices. The probe allows accurate and simultaneous measurement of currents with small and high magnitude, while eliminating the need of high gain amplifiers and high resolution ADCs. The probe's higher band is obtained by introducing a switched load. The switched load can be developed either by a fully controlled electronic switch – MOSFET or by a simple rectification diode. Analysis, computer modeling and verifications through simulations are presented for the suggested circuit.