1. In the comparison of wireless charging functions, it can be found that 6 out of 10 models support manual shutdown of wireless charging function, and Hao Bo GT also supports language shutdown, with excellent overall performance. Slightly regrettably, the BMW Z Buick Veran Pro GS, Chery Arezer 8 and Tesla Model 3 do not support closing.
2, the highest charging efficiency of Xiaomi and Huawei require the mobile phone to support their own protocols, so we separately tested Huawei Mate 30 with Huawei wireless charging mobile phone stand and Xiaomi 10 with Xiaomi wireless chargingThe phone stand. The standard test uses the iPhone 11 pro with all wireless charging phone stands, and the rule is to keep the phone lit, and test the time required to charge 10% (from 40% to 50% of the phone charge) on all products under test.
3, "Electric vehicle wireless charging system Part 2: Communication Protocol between vehicle charger and charging device" (GB/T 38772), "Electric vehicle wireless charging system Part 3: Special requirements" (GB/T 38773), "Electric vehicle wireless charging systemPart 4: Electromagnetic environmental limits and test methods (GB/T 38774) a total of 4 national standards. 4, in summary, Keysight E4980A/AL precision LCR table with its high precision, wide impedance range, fast measurement and multi-fixture selection, has become the ideal choice for wireless charging system coil test, to ensure the high efficiency and high reliability of the system provides a strong support.
5, in the performance test, the Lauco USB-C 12 in 1 hub performed stable, whether it was fast insertion of devices, or wireless chargingNo problem. Even when connected to multiple devices at the same time, such as monitors, external storage devices, ipads, iphones, MacBook chargers, it can stay calm and not overheat. This hub is undoubtedly the ideal choice for travel storage, replacing the traditional hub location.
First is a wireless charging pad for testing, 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.
Therefore, in the test must consider the charger, interface line and battery three aspects of the match, in order to ensure the accuracy of the charging efficiency. Next, the fast charging efficiency of different mobile phones is evaluated through a test device with a charge control chip. The test equipment will record the battery voltage, current, charging time, charging speed and other key data of each phone, and then synthesize itCalculate the charging efficiency of each phone.
In the horizontal evaluation, we use the following three methods to evaluate. Standby test Standby test is one of the most basic tests to evaluate the performance of a mobile phone battery. The test requires the phone to keep the screen on and perform various application tests to measure the phone's power management performance, such as standby time and battery consumption. For the standby test, we used a test program during the test and set the brightness of the phone to the same standard value.
First of all, the battery loss test of the mobile phone is completed by simulating the user's use scenario. measuringThe steps to charge a mobile phone are as follows: Ensure device compatibility: Check whether the mobile phone supports wireless charging. Mobile phones that support wireless charging can only be connected to wireless power banks. Charging bank pre-charge: Plug the wireless charging bank into the power supply or USB port of the computer to charge. During the charging process, ensure that the wireless charging bank has sufficient power to avoid affecting the charging effect.
3, if the direct back of the mobile phone with built-in wireless charging function is close to the launching surface of the charging treasure, the charging treasure generally has a switch, to open. If the phone itself does not support, you need to connect an external wireless receiver. If your phone comes directly with noLine charging function, just put the back on the side of the wireless charging bank that can be charged.
4, first open the connection Settings on the phone, enable Bluetooth or NFC function. Touch the NFC area on the phone screen or select the wireless charger from the Bluetooth connection list to connect. After the connection, the wireless charging bank will automatically identify the type of mobile phone and adjust the output current according to different mobile phone models to provide the appropriate charging current for the mobile phone.
1, wide impedance range, to adapt to a variety of needs The inductance of the wireless charging coil is usually at the micro hen level, the test frequency is in the kHz range, which requires a wide and accurate measurement range. The E4980A/AL has a wide impedance range from 4 milliohm to 100 milliohm, and can cover this band with 10% accuracy, making it particularly suitable for the precise evaluation of wireless charging coils.
2, the secondary winding is broken, the wireless charging coil has two windings, one is the main winding, one is the secondary winding, after the secondary winding is damaged, it will cause the main winding to heat, and the output has no voltage.
3The capacitance of the coil to the ground is tested because the capacitor is the material that the electric field energy and the magnetic field energy are converted, and the electric field energy and the magnetic field energy need to be converted in the process of wireless charging. The process of wireless charging is the transmission of electric energy from the charging device to the receiving device.