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Two-Terminal Self-Powered Magnetic Sensor with Warning Lights for Elevator Applications

Bayram Akdemir
Electrical and Electronics Engineering Department, Engineering Faculty, Selçuk University, Konya, Turkey
Abstract—Sensors are the heart of any electronic device and make device behaviors robust. Generally, malfunctions are related to sensor errors. Many sensors are based and characterized on nature behavior such as magnetic field, thermal sensing or light sensitivity. Magnetic sensors are widely used in many applications such as automobiles, doors, elevators for triggering, limit switches. Commonly, magnet sensors include a reed switch having contacts that are of magnetic material and the electromagnet acts directly on them without requiring any external device. But reed switch based sensors are not robust in case of any fault in operation such as short circuit or over load. Passive sensor does not require a power supply to run and reed switch is a passive sensor. In this study, self-powered electronic magnetic sensor was designed around the reed switch core. Designed sensor has on-off output capability according to magnetic field presence and although has only two wires, it has ability to show its state with light emitting diodes. In order to obtain long life and robust structure, thermal and short circuit protection has been included. Designed sensor was built and tested in elevator application as real environmental situation. Characterized novel sensor has 250mA current capability at low voltage DC and AC current. 
 
Index Terms—reed switch, elevator, thermal protection, current limiter, vertical transporting, sensor

Cite: Bayram Akdemir, "Two-Terminal Self-Powered Magnetic Sensor with Warning Lights for Elevator Applications," International Journal of Electronics and Electrical Engineering, Vol. 4, No. 2, pp. 172-176, April 2016. doi: 10.18178/ijeee.4.2.172-176
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