Electromagnetic induction intelligent wireless charger circuit design

inductance

Overview:
Because different types of electronic products need to use different chargers, it is necessary to find a suitable socket and straighten the wiring when charging. The author uses the principle of electromagnetic induction to design a smart wireless charger. The wireless charger has automatic inductive charging and intelligent power-off after full charge. It is not only suitable for electronic products with different charging voltages and capacities, but also capable of simultaneously charging multiple different electronic products. The design adopts the design idea of ​​intelligent wireless charging, which has the advantages of convenient use and wide application, and has high promotion and application value.

1. System Overview
1.1 Current charging mode In today's rapid development of electronic technology, the number of mobile phone users worldwide has reached 3.3 billion. Together with other peripheral electronic products such as MP3 and MP4, less than 2 people have an average charge. Portable electronics. At present, data line plug-in charging is commonly used. This type of charging method has a bad touch phenomenon when the data line interface is used for a long time, and the individual chargers are not widely adapted, because different types of electronic products need to use different ones. The charger, when looking for a suitable socket and smoothing the wiring, can be said to be time-consuming and laborious; charging various portable electronic products is a headache. In order to improve the above phenomenon, it is necessary to develop a smart wireless charger.
1.2 Introduction and Advantages of the Smart Wireless charger uses the principle of electromagnetic induction. It is a non-contact charging system that no longer transmits power through wires (charging lines), but wirelessly. There is no physical interface used for charging. Compared with the general charger, it avoids the trouble of plugging or unplugging the battery. It has the working principle of the general charger. The work uses one (charger) to charge multiple (inductive load) and intelligently charge. Design idea; when the wireless charger charges the load, the indicator light will be converted from green light to colorful light, and the mobile phone also correctly displays the charging status and intelligently completes the charging process (the experimental product is a mobile phone). The charger can charge multiple loads at the same time, can automatically sense whether there is load charging, achieve automatic charging, automatically power off 10 seconds after full charge, to achieve intelligent; thus greatly facilitating users. The smart wireless charger is very convenient to use, and a charger can meet the needs of a family. It has the advantages of high promotion and application value, low cost (similar to the price of a general charger), and many other large companies in the world (such as Sony). , Intel, Apple, Philips, etc.) is also in the hot research; smart wireless charging will be the development direction to replace the physical plug, will certainly be welcomed and valued by people.
Based on the above ideas, make full use of the knowledge of electronic technology learned, and be carefully guided by the teacher. Design and manufacture smart wireless chargers with the following advantages:
(1) The low-cost circuit is composed of a pulse generating part, a power amplifying part, a filtering part, a comparing part, and a transmitting and receiving part, and each part is composed of only a few small components, and is simple to manufacture.
(2) One-to-many charging one charger can charge multiple loads, one family can purchase one charger to meet the needs of the whole family. As the load increases, the work efficiency will also increase, so it can save power while It can also reduce unnecessary overhead.
(3) Convenience Compared with the general charger, it reduces the trouble of plugging and unplugging, and also avoids the phenomenon that the interface is not applicable, the contact is bad, and the elderly can also be conveniently used.
(4) Intelligent As long as the inductive load is placed on the charger, it can automatically sense the charging. Through the information feedback, when the inductive load is fully charged, the power is automatically turned off to realize the intelligent charging process.
(Please read the PDF for details)