The low cost voltage and current measurement device design for power converters

摘要

The sensing circuits are very important devices to measure for both current and voltage magnitudes of the systems. This paper presents a new sensing circuit design with significant advantages for DC voltage systems. The proposed sensing circuit is capable to measure currents and voltages by means of one current transducer and resistor network of voltage measurement. The accuracy and reliability of the proposed circuit are ensured by employing operational amplifier that can detect μV-level voltage variations at the differential inputs. Moreover, the proposed system is checked against to the previously one reported by authors in terms of overall cost, superiorities and drawbacks. The performed experimental studies showed that the proposed sensing circuit offers several significant advantages such as very low cost, very high accuracy and very low power supply requirements with respect to the formerly designed system.