1. Principle and structure of wireless charger
Wireless charging system mainly adopts the principle of electromagnetic induction, and realizes energy transfer through energy coupling of coils. As shown in figure 1, when the system is working, the input terminal converts AC mains power into DC power through the full-bridge rectifier circuit, or directly supplies power to the system with 24V DC terminal. The direct current output by the power management module is inverted and converted into high-frequency alternating current by the 2M active crystal oscillator, and provided to the primary winding. Through the coupling energy of two inductance coils, the current output by the secondary coil is converted into direct current through the receiving conversion circuit to charge the battery.
Question 2: The working principle of wireless charger Physicists have long known that energy can be effectively transferred between two objects with the same vibration frequency, but the interaction between objects with different frequencies is weak. This is why a singer can break a bottle with different amounts of water without affecting other bottles. It's like sitting on a swing and letting our drooping legs swing synchronously, which can bring strength to the swing. Wireless charging technology makes use of this principle. Similarly, wireless charging technology also applies electromagnetic wave induction principle and related AC induction technology. At the sending end and the receiving end, the corresponding coils are used to send and receive the induced AC signal for charging. Users only need to put the charging device on a "tablet" to charge. This charging method once appeared on watches and razors, but it was not effective to charge large-capacity lithium-ion batteries at that time. As the picture shows, a new wireless charger was originally invented by a British company. It looks like a plastic mouse pad. This mouse pad is equipped with a dense array of small coils, so it can generate a magnetic field and transmit energy to electronic equipment equipped with special receiving coils for charging. The receiving coil is made of magnetic alloy winding, which is similar in size and shape to chewing gum and can be easily attached to electronic equipment. The mobile phone can be charged when placed on the mat, and multiple devices can be charged at the same time. Charging technology has appeared before, but this new invention is more convenient and practical. Mobile phones and other devices can be charged anywhere on the "mouse pad" as long as they are connected to the receiving coil, unlike some previous technologies, which require accurate positioning. Several devices are placed on the mat at the same time and can be charged at the same time. The magnetic field generated by the charger is very weak, which can charge the equipment and will not affect the nearby credit cards, video tapes and other items that use magnetism to record data. Wireless charging system mainly adopts the principle of electromagnetic induction, and realizes energy transfer through energy coupling of coils. As shown in the figure, when the system is working, the input terminal converts AC commercial power into DC power through the full-bridge rectifier circuit, or directly supplies power to the system with the 24V DC power terminal. The direct current output by the power management module is inverted and converted into high-frequency alternating current by the 2M active crystal oscillator, and provided to the primary winding. The energy is coupled by two inductance coils, and the current output by the secondary coil is converted into direct current through the receiving conversion circuit to charge the battery. The changing magnetic field will produce a changing electric field, and the changing electric field will produce a changing magnetic field. The magnitude of the magnetic field is related to their change rate. The change rate of sine function is another sine function, so electromagnetic waves can spread out, and the generation of induced voltage is related to the change of magnetic flux. Therefore, the changing magnetic field inside the coil produces induced voltage, thus completing the charging process. Wireless charging of mobile phone is a relatively novel charging method, and its principle is actually very simple, which is to separate the primary and secondary of ordinary transformer to achieve the purpose of wireless. Of course, the working frequency of wireless charging is relatively high, and even the magnetic core can be abandoned to realize the function of directly transferring energy between coils.
Question 3: Explain the principle of wireless charging briefly and in detail, tieba.baidu/...=share..
Question 4: What is the principle of Samsung wireless charging? It uses near-field induction, that is, inductive coupling, to transfer energy from power supply equipment (charger) to electrical equipment.
Question 5: What is the principle of wireless charging? Wireless charging is based on the principle of high-frequency electromagnetic-magnetoelectric conversion, which is the principle of traditional induction transformer, except that the magnetic circuit of transformer is closed and the magnetic circuit of wireless charging is semi-open (directional). Moreover, the open electromagnetic conversion in daily life is everywhere, such as between TV towers and televisions, and between mobile phone base stations and mobile phones. Just because of the distance, the electric energy received by the receiver is too small to be used as a signal source and energy source. But there are exceptions For radio enthusiasts, it is well known that there is an antique called "crystal receiver", which directly uses wireless broadcast signals as working energy.
Question 6: What is the principle of wireless charging of mobile phones? There are three main types: inductance, resonance and radio waves.
At present, electromagnetic induction technology and vibration technology are mainly used.
Electromagnetic induction: alternating current with a certain frequency in the primary coil generates a certain current in the secondary coil through electromagnetic induction, thus transferring energy from the transmitting end to the receiving end. It is the first generation of mobile phone wireless charging, with mature technology, but it can only be charged in a short distance (qi standard, within 1cm, within 5 watts), and cannot be charged in a single way like WiFi.
Resonance technology is the second generation, and its principle consists of an energy transmitter and an energy receiver. When two devices are tuned to the same frequency or vibrate at a specific frequency, they can exchange energy with each other, which is a technology being studied at present.
If the research and development is successful, it can provide one-to-many charging (within 5 meters and 500 meters, similar to WiFi), which is very promising.
Therefore, at present, the mainstream products in the market are induction technology, and the Qi standard is implemented. Generally, as long as it is a Qi standard charging treasure/charging stand (transmitter), it can charge the back case/protective case (receiver) of the Qi standard mobile phone. Now Samsung, LG, Nokia and Philips have similar products on sale, including Shenxinxi Electronics and Anji Ke Technology in China. The above content comes from the network, which is more professional. Simply put,
Question 7: What is the principle of mobile phone wireless charger? The principle is very simple, that is, electromagnetic induction, but the actual wireless charger is definitely more complicated, because it needs supporting program functions, such as foreign body detection, temperature control, frequency conversion and so on. If you just play the test, take two coils of the same specification (different, but the voltage will change). One coil can be charged by inputting 5V alternating current, and the other coil can be charged by connecting the charging port of the mobile phone, but the efficiency is definitely very low. At present, the charging distance (gap between coils) of mobile phone chargers is generally set at 3-8 mm. If it is too close, it is easy to produce mutual inductance. If it is too far away, the induction is too weak, or even impossible. At present, the charging efficiency (conversion rate) can reach 80-84% in the laboratory and 76% in mass production according to QI standard, but the actual use is almost 60-73%, which is related to the position and line loss.
Question 8: What is the principle of wireless charging? Wireless charging is based on the principle of high frequency electromagnetic magnetoelectric conversion. The traditional induction transformer is based on this principle, except that the magnetic circuit of the transformer is closed and the magnetic circuit of wireless charging is semi-open (directional). Moreover, the open electromagnetic conversion in daily life is everywhere, such as between TV towers and televisions, and between mobile phone base stations and mobile phones. Just because of the distance, the electric energy received by the receiver is too small to be used as a signal source and energy source. But there are exceptions For radio enthusiasts, it is well known that there is an antique called "crystal receiver", which directly uses wireless broadcast signals as working energy.
Question 9: What is the principle of wireless charging? How to achieve it? 40-minute wireless charging technology is a technology that uses magnets to charge equipment without wires at all. Wireless charging technology, originated from wireless power transmission technology, uses magnetic vibration to transfer the charge in the air between the charger and the equipment, and the coil and capacitor form * * vibration between the charger and the equipment to realize efficient power transmission.
According to engadget, a company in Pennsylvania, USA, signed undisclosed cooperation projects with more than 100 major electronic products companies by using this Powercast technology, including some electronic products with relatively low power consumption, such as mobile phones and MP3 players, as well as manufacturers of auto parts, temperature sensors, hearing AIDS and even medical instruments.
This technology is favored by so many manufacturers because its unique electromagnetic wave receiving device can be adjusted according to different loads and electric field strengths, and at the same time it can maintain a stable DC voltage, which also means that the electromagnetic wave power scattered in the air can be minimized. It is said that this equipment has obtained FCC certification.
Question 10: What's the difference between wireless charging and solar cells? As the name implies, wireless charging removes wires. In fact, the mobile phone is not wired, but has two ends. One is the sender and the other is the receiver. The transmitter and receiver perform electromagnetic conversion. There is a copper coil in the receiver, which converts magnetism into electric energy, and then sends the telex to the mobile phone battery through FPC cable. In a sense, there is still a process of power supply, but once the phone is disconnected, the meaning is different. Many times we are plugged in when driving, which is definitely inconvenient. If we answer the phone, we have to pull it with both hands, but it will be different after wireless charging. Pick it up at any time, put it down at any time, charge it without looking for a wire or plugging it in. For example, the wireless charging car phone bracket of smart pig has greatly changed our daily life.