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Qi Charger Board Analysis _HOT_



Wireless charging is making inroads in the healthcare, automotive and manufacturing industries because it offers the promise of increased mobility and advances that could allow tiny internet of things (IoT) devices to get power many feet away from a charger.




Qi charger board analysis


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Broadly speaking, there are three types of wireless charging, according to David Green, a research manager with IHS Markit. There are charging pads that use tightly-coupled electromagnetic inductive or non-radiative charging; charging bowls or through-surface type chargers that use loosely-coupled or radiative electromagnetic resonant charging that can transmit a charge a few centimeters; and uncoupled radio frequency (RF) wireless charging that allows a trickle charging capability at distances of many feet.


The first class of mobile device wireless chargers emerged a six or so years ago; they used tightly coupled or inductive charging, which requires users to place a smartphone in an exact position on a pad for it to charge.


In July, Dell released a Latitude laptop that incorporates resonant wireless charging from WiTricity, a Watertown, Mass.-based company that licenses technology originally developed at the Massachusetts Institute of Technology (MIT). The Dell wireless charger offers up to 30W of charging power, so a Latitude laptop will charge at the same rate as it were plugged into a wall outlet.


Both Ossia and Energous have demonstrated wireless charging beyond 15 feet. Ossia's charger can send about two watts up to several feet, but that drops off quickly as the distance increases. Even at 30 feet, however, the amount of power that can be transmitted is "meaningful," according to Ossia CEO Mario Obeidat, alluding to trickle powering devices so as to maintain their charge.


I have written several postings on Qi wireless power. To get a good idea how Qi really works, I bought cheap bare Qi charger board Qi Wireless Charger PCBA Circuit Board + Coil Charging (costs only slightly over two Euros / USD).Qi Wireless Charger PCBA Circuit Board + Coil Charging kit consists ofQi Wireless Charger PCBA Circuit Board + Charging Coil without any case. The charging coil has 10 turns in it and there is a ferrite below the coil.


was wondering how efficiently the inductive phone chargers worked, so I got a couple of modules off ebay and a receiver plate to take to bits. They do seem to communicate with each other, rather than just pumping current into any coil that comes near.The transmitters seemed to use what appeared to be a microcontroller controlling an H-bridge driver that then drove the coil via a paralleled cluster of capacitors. The receiver had a modest amount of circuitry in it with what appears to be a dedicated QI receiver chip, possibly by Texas Instruments.Efficiency was 50% at best and got MUCH worse as the coils were parted.


With the development of the times and the progress of science and technology, people continue to explore new possibilities; the leap from wired to wireless is one of them, breaking the limitations. Similar to wireless mice and wireless microphones, this paper aims to study an Internet of Things-based smart wireless charger that, by using mathematical analysis and wireless charging technology, requires experiments to include wireless charging stations, associated chip areas, and home gateways that are used in combination with them. In the experiment, the control circuit, transmit circuit, and reception circuit of wireless charger are studied, and the wireless charging system is analyzed and calculated in detail, and a wireless charger is designed. Electromagnetic field sensing, radio wave transmission, and resonance methods are applied to achieve the shortest charging time and the best quality in order to prevent the charger from heating and burning during charging. Experimental data show that this Internet of Things-based smart wireless charger can fully replace wired chargers for 99% of small appliances; the charging efficiency of large electrical appliances such as desktop computer is also 1.4 to 1.6 times increased. Experimental data show that this Internet of Things-based smart wireless charger can efficiently and conveniently charge electrical appliances; however it is relatively expensive; the required technology is relatively complex but can make charging more efficient. It can be seen that wireless charging has a major breakthrough in the concept of future charging.


Today, everything from mobile phones to iPads and from warm hands to cameras requires multiple charges to meet the needs of life. Once upon a time, the common way to charge was the transmission of wired power, where AC power was connected at one end and the rechargeable battery of an electronic device on the other. It can be seen that if multiple devices are charged at the same time, the charging cables will often be mixed together This approach can easily cause mechanical damage, resulting in a reduction in product life. But if you think about charging with a wireless charger, the charger and the power supply are completely separated. Some wireless chargers also contain more than one transmit coil, which has a very large sensing area and is extremely stable in charging status, which does not break off from time to time. In addition, for the safety of the wireless charging process, some wireless chargers support the latest intelligent charging management technology. It is not difficult to find that the benefits of wireless chargers are multifaceted; the rise of wireless charging technology is the product of the combination of innovation and technology and is the inevitable trend of future development; and how to make high-efficiency and stable rugged smart wireless chargers is something we need to constantly explore [1].


From the perspective of communication objects and communication processes, the basic feature of the Internet of Things is the process of describing and embodying the information interaction between things, people, and things. The basic characteristics of the Internet of Things can be summed up as holistic perception, transmission, and intelligent processing. First, the Internet of Things is connected by things. Second, information is exchanged and there is communication between things. When the Internet of Things connects different items, it always has to do something; otherwise, what is the use of connecting? Because information exchange and communication are the most fundamental requirements of all networks and the Internet of Things is essentially a network, the Internet of Things also has the characteristics of information exchange and communication, but the information exchange and communication are between things and things. Furthermore, the Internet of Things is industrial. The Internet of Things is with industry attributes, leaving its industry concept; the Internet of Things is a pseudoproposition, only in an industry; the Internet of Things programs and applications are universal. Finally, the objects of the Internet of Things are connected to many things connected to connected terminal devices. The End Devices of the Internet of Things are not a few but many. Just like social networks, the more people join, the more valuable they are, and that applies to the Internet of Things. When the Internet of Things collects very little data, it is of little value because it may not be representative; and when a lot of data is collected and a mass is reached , its value is reflected, because we can do big data analysis of this data and discover certain patterns and then develop solutions for specific industries to improve industry efficiency [13, 14].


Depending on the amount of power the charger is to transmit, the wireless transmission inductance of the sender and receiver is calculated to be 33 H. The factors that affect inductor parameters in hollow coupled inductors are wire diameter, coil diameter, and winding number, and the hollow coil inductor can be calculated according to the following formula:


The attacker only observes and analyzes a certain protocol data power distribution unit without disturbing the information flow. Even if these data are not easy for an attacker to understand, he can also understand the address and identity of the protocol entity that is communicating by observing the protocol control information part of the power distribution unit and study the length and transmission frequency of the power distribution unit in order to understand the nature of the data exchanged. This passive attack is also called traffic analysis.


Based on the research of smart wireless chargers based on the Internet of Things, the model design of smart wireless chargers is realized by using mathematical analysis and wireless charging technology. Mathematical analysis is the oldest and most basic branch of analysis. It generally refers to general theories such as calculus, infinite series, and analytic functions as the main content and includes their theoretical foundations (real numbers, functions, measurements, and limits). Basic theory is a relatively complete subject of mathematics and is also a basic course for university mathematics majors. The content of mathematical analysis research includes real numbers, complex numbers, real functions, and complex variable functions. The method of mathematical analysis is related to its geometry, but as long as any mathematical space has a defined neighborhood (topological space) or a definition of the distance between two objects (metric space), this article will use this to study the relationship between the wireless network and the Internet of Things. In order to assemble a complete charger, the experiment needed to include a wireless charging table, associated chip areas, and a home gateway that was used in combination with it. Through the research of the control circuit, transmitting circuit, and receiving circuit of the wireless charger, as well as the detailed analysis and calculation of the wireless charging system, this paper designs a wireless charger. Applying electromagnetic field sensing, radio wave transmission, and resonance, it tries to achieve the shortest charging time and the best quality in the case of preventing the charger from heating and burning during charging.


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