Proposal of a Sensing Circuit for Detecting Physical Quantity Regardless of Electrical Units

Abstract

In recent years, the introduction of IoT with electronic devices has progressed rapidly, and various kinds of sensors are widely used in electrical appliances and home appliances. It is necessary to prepare a number of sensor-dependent detection circuits which measure the output of each sensor because the quantity of electricity depends on the sensor. This is a bottleneck in achieving price reduction. Since different sensors are used in different ways, repair and replacement in case of failure vary depending on the type of sensors. To solve those problems, a smart sensing circuit for versatilely detecting the different quantity of electricity is proposed not depending on the sensor type. In this paper, the sensor-independent sensing circuit is proposed to uniformly detect the electric quantities of voltage, current, and resistance. The proposed circuit achieves both sensorindependent usage and low cost. It is also possible to be easily and promptly replaced regardless of the sensor type when a malfunction occurs.