The technology refers to the efficiency in a wireless charging system that can be converted from a power source to electrical energy and transmitted to the target device. The efficiency is mainly determined by the energy loss in the energy transmission process. Usually, the conversion efficiency of wireless charging systems is between 60% and 80%, which means that 20% to 40% of the energy is lost during the energy transmission process. Consider the environment, equipment and technologyThe conversion efficiency of wireless charging systems will also be different.
According to the current data of mobile phone manufacturers, the efficiency of wireless charging is mostly between 65% and 75%.
You need to unplug the data cable, connect the charging need to plug in the data cable again, this time the wireless charger only needs to place the phone on the sensor can be charged. Charging efficiency: In the case of the same charging time, the power of the commonly used wired battery charger after charging is 93%, and the power of the wireless charger after charging is 88%. Obviously, there is still a gap in the charging efficiency of wireless chargers,Efficiency How to test and verify
In order to simulate the real use environment, we used Apple iPhone 13 Pro and Huawei P50 Pro as two fixed test machines. During the test, the power of the two mobile phones is first exhausted, and then they are respectively placed on the wireless charging board of the car for 15 minutes to test their charging efficiency. After charging, the back of the two phones was measured with an infrared thermometer to test the heat generated by the body.
When conducting wireless charging efficiency tests, we need several main tools and equipment. First is a forTest the wireless charging pad, it needs to be able to support all the major charging protocols, such as Qi, AirFuel, and PMA. In addition, an ammeter is required, and its main function is to test the current consumed by the wireless charging pad when charging. When testing, we need to first decide which phone to test.
You first look at the power of the charger is how much W, how much output current is, and then how much mah cell phone battery capacity, capacity = current * time, see how much difference between the theoretical charging time and the actual charging time is calculated, you can roughly get the efficiency.
2,The basic principle of wireless charging is to convert the current into a magnetic field, which is transmitted through the air and then converted into a current to be transmitted to the intelligent terminal. When the system works, the input end converts the AC mains into direct current through the full bridge rectifier circuit, or uses the 24V direct current end to supply power to the system directly. After passing through the power management module, the output direct current is converted into high-frequency alternating current through the 2M active crystal oscillator inverter to supply the primary winding.
3, wireless charging system mainly uses the principle of electromagnetic induction. Wireless charger refers to the charger that does not need to be connected to the terminal device that needs to be charged without the traditional charging power cord, and uses the latest wireless charging technologyBy using the magnetic field generated between the coils to magically transmit electrical energy, inductive coupling technology will become a bridge connecting charging base stations and devices. 4, wireless charging is also known as inductive charging, non-contact inductive charging, from wireless power transmission technology, is the use of near-field induction, that is, inductive coupling, by the power supply device (charger) to transmit energy to the power device, the device uses the received energy to charge the battery, and at the same time for its own operation.
5, the principle of wireless charging technology is "magnetic electricity", simply put, it is installed on the charging device and mobile phone equipmentThe two "magnetic devices" sense each other and form an electric current. At present, products supporting wireless charging have appeared in mobile phones, electric vehicles, smart furniture and other fields. Among them, in the mobile phone industry, the "Qi standard" is the most common, and Qi labels are often used in the packaging of many mobile phones and wireless chargers.
6, generally seen wireless charging, the use of the "current magnetic effect" and "electromagnetic induction" principle. In 1819, Danish scientist Elster observed that if there is an electric current on a wire, a magnetic field will be generated around it, which can deflect the north finger. Later generations have further discovered that willWhen the wire is looped, or even wound into a coil, the magnetic field generated will be stronger and more concentrated, which is called the "current magnetic effect".
1, in terms of hardware upgrades, the iPhone 6's 4G antenna will be greatly improved, support LTE Category 6, speed increased to 300Mbps, twice the iPhone 5s. In terms of wireless charging, Apple has submitted standards to the Wireless Charging Alliance, butThe specific technical standard A4WP or PMA has not been determined.
2, Apple iphone6s is not wireless charging. The reason why the metal back case of the iPhone 6s can't use wireless charging is because the electromagnetic induction technology heats the metal case. So users need to buy a plastic material wireless charging housing to achieve.
3. Touch ID made its debut on the iPhone 5s. The iPhone 6s and iPhone 6s Plus include 3D Touch pressure sensing on the screen for the first time; Wireless charging appeared for the first time in the iPhone 8 Plus model, using the Qi (Chee) wireless charging standard.
Wireless charging, even remote sensing charging. Its principle is electromagnetic induction, which is usually used in small power situations and does not require electrode contact points. There's a feeling in the columnThe electric toothbrush insert part also has induction coil inside, there are plastic insulation outside, there is no electrical contact, induction to obtain electricity to charge the battery to drive a small motor.
Wireless charging principle - electromagnetic induction wireless charging Electromagnetic induction wireless charging is the most used wireless charging solution, high school physics textbooks have mentioned through the primary coil of a certain frequency of alternating current, using electromagnetic induction in the secondary coil to produce a certain current, thereby transferring energy from the transmission end to the receiving end.
The basic principle of wireless charging is to convert the current into a magnetic field, and the magnetic field passesAfter air transmission, it is converted into current and transmitted to the intelligent terminal. When the system works, the input end converts the AC mains into direct current through the full bridge rectifier circuit, or uses the 24V direct current end to supply power to the system directly. After passing through the power management module, the output direct current is converted into high-frequency alternating current through the 2M active crystal oscillator inverter to supply the primary winding.
1, the advantages of wireless charging technology is that it has high technical content, easy operation, and can implement long-distance radioCan be converted, but the transmission distance of high-power wireless charging is limited to 5 meters. So the expression is wrong.
2, the test results show that the wireless transmission distance is about 15 centimeters, but Fujitsu says that the wireless transmission distance can eventually be achieved several meters. It should be pointed out that the further away from the device, the more power lost in transmission. Fujitsu's system is similar to technology developed by Witricity, an American company, which also uses magnetic resonance to transmit electricity over distances of several meters.
3, wireless charging technology is the use of electromagnetic induction principle, used in the sending and receiving endThe corresponding coils are used to send and receive induced currents for charging.