Journal of Science and Arts Year 17, No. 4(41), pp. 861-870, 2017 ISSN: 1844 – 9581 Physics Section ORIGINAL PAPER SIMULATION AND MODELING OF BATTERY OPERATION USED IN REAL-TIME MONITORING EQUIPMENTS OF VITAL HUMAN PARAMETERS ION VASILE 1 , VICENTIU VASILE 1 , VIOREL MIRON-ALEXE 1 , EMIL DIACONU 2 , ION CACIULA 2 , HORIA ANDREI 3 _________________________________________________ Manuscript received: 01.09.2017; Accepted paper: 11.10.2017; Published online: 30.12.2017. Abstract. Today there is a significant increase in chronic diseases, of which infarct / pre-infarct is more and more present among the population and has serious consequences. For this reason, it is a permanent research theme for those involved in cardiology, especially as this type of disease is chronic and should be monitored periodically and kept under observation. Methods, systems for monitoring patients with such diseases require time and a great deal of human and financial effort. Patient monitoring systems, especially non- hospitalized, are becoming increasingly used and can provide a solution to problems that arise among the population, especially among the elderly. These systems have the advantage of real-time transmission of vital parameters and, when necessary, effective treatment and rapid medical intervention, reducing health care costs [1]. Preventing and observing these types of illness requires monitoring of vital parameters such as blood pressure (TA), heart rate (Pulse), blood oxygen concentration (SpO2), etc. The article proposes both the analysis and simulation of the functioning of a vital parameter monitoring system and the modeling of its electrical characteristics based on a complete set of measurements. The data acquisition system is designed to determine output voltage, current and power consumed with great accuracy. A Matlab application is generated to determine the approximate polynomials of the measured magnitudes and the calculated errors prove the precision of the proposed method. The time limitation of the nominal operation of this system due to the circuit's battery is also taken into account. Keywords: simulation, modeling, real-time monitoring, Matlab. 1. INTRODUCTION Measurement of patient's vital parameters such as heart rate, oxygen and blood pressure involves the implementation of a remote hard and soft data acquisition and transmitting system. Measurement of parameters can be done in a classical way through patient collaboration with medical staff, or using portable monitoring devices capable of transmitting real-time vital data. This type of devices are generally characterized by limitations imposed by the power supply, which in the present case is represented by batteries. In this context, electronic devices for monitoring vital parameters of the patient have to meet a number of requirements, namely to have a reduced size and to consume a lower current [2-5]. 1 Valahia University of Targoviste, Institute of Multidisciplinary Research for Science and Technology, 130004 Targoviste, Romania. E-mail: vasileion20041966@yahoo.com. 2 Valahia University of Targoviste, Faculty of Electrical Engineering, Electronics and Information Technology, 130004 Targoviste, Romania. 3 Valahia University of Targoviste, Doctoral School of Engineering Sciences, 130105 Targoviste, Romania.