ELECTRICAL ENERGY MEASURING MODUL WITH GALVANOMAGNETIC CURRENT TRANSDUCER

Abstract

In our time, electrical energy has been used in all household and industrial settings. This is achieved by the ability of the device to convert it into another form of energy – mechanical, lifting, light, heat, and many more. etc., and vice versa. Exactly this variety of energy converters enables the development of electronics, communications, transport, health, energy, but also the search for and the creation of new sources and converters known as alternative sources of energy.The generation and consumption of electrical energy does not end there. In order to assess the quantity and quality of the generated electrical energy, special devices known as electric meters are needed. Measurement of electrical energy is important for both households and industry, as well as for its production and efficient use. There are different methods and means for electrical energy measurement. They work on the basis of different physical principles – induction, electromagnetic, galvanomagnetic, etc., but the task of all of them is to show the result of the current and voltage integrated in time.Various methods are known for the basic parameters measurement defining the value of electrical energy (electrical current and voltage). With the development of microelectronics, and in particular of sensor technology, various sensor transducers have been developed to measure electrical energy through a high precision electric circuit using a contact and/or contactless method. One of the most commonly used sensor transducers for measurement of electrical current in modern energy meters are magneto-sensitive ICs. They are characterized by high reliability of the output signal, temperature and electrostatic steadiness and not least a long period of trouble-free operation1. The sensible element in magneto-sensitive ICs is most often a Hall element or a magnetoresistor. It measures the current flowing through the conductor by converting the magnetic field around it into electrical voltage. The advantage of magneto-sensitive ICs is possibility in a semiconductor chip to create sensitive element and a processing and forming signal circuit. This makes the measuring channel more secure and compatible with integrated circuits for processing and transmitting measurement data.The article presents an experimental model of an electronic module for electrical energy measurement in a single phase AC current circuit. The measuring module is realized on the basis of a specialized integrated circuit ADE series of the Analog Device Company for electrical energy measurement and a current channel, realized by a magnetic-sensitive integrated circuit ACS of the Allegro MicroSistem Inc. for electrical current measurement. Presented are a block and schematic circuit diagrams, experimental design and experimental results showing the performance of the device.