A Mobile Phone Charger Design Based on High Voltage Induction Current

Abstract

This paper introduces the principle of electromagnetic induction of the high tension line. With the aid of the spark plug, induced charge can be transferred to the high voltage winding in the form of short pulse and then generate induced current .With the appropriate circuit, the induced current can be converted to dc 5V voltage for mobile phone charging. This paper designed this kind of conversion circuit, and demonstrates that the transformer output short pulse signals of 8V~ 25V can be converted to 5V dc voltage. Introduction Today s phones are big-screen phones that use relatively fast power and have to be recharged almost every day. When traveling, we often encounter the situation that the mobile phone is out of power, even if we bring a charger, this situation happens from time to time, so it is an exciting thing to design a device that can be charged at any time. This paper mainly studies how to charge the mobile phone through the induction current of the high voltage line. Firstly, the induction current is received through the antenna device, and then the circuit is converted into the dc 5V voltage required by the mobile phone. Two questions now stand in the way. First, is the charger safe? Second: how to ensure that the obtained induced current can meet the requirements of charging? First answer the first question. As for the safe distance of high voltage, the following data can be obtained according to article 5 of the implementation rules of the regulations on the protection of power facilities, as shown in table 1: safe distance under different voltages. Table 1. Safe distances at different voltages voltage (KV) 10 35 66-110 220 330 Minimum safety Distance (m) 1.5 3 4 5 6 When the distance is greater than the safe distance above, the person is safe. For the second question, the principle of induced current will be explained below. When traveling, high voltage cable is often encountered, so as long as there is a high voltage cable, then it can be convenient to charge the phone, the following describes the principle. Principle of High Voltage Induced Current According to the principle of electromagnetic field generation: a changing electric field produces a magnetic field, and a changing magnetic field produces an electric field. In the process of transmission, because the delivery is alternating current (ac), frequency of 50 Hz, the change of current alters the magnetic field around directly cause the high tension line, the direction of the magnetic field lines to the right hand spiral rule, changing magnetic field and electric field changes, such changes of electromagnetic field around the high tension line, also known as the power frequency electromagnetic field. 2nd International Conference on Electrical and Electronic Engineering (EEE 2019) Copyright © 2019, the Authors. Published by Atlantis Press. This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/). Advances in Engineering Research, volume 185