How to Wireless Charge your iPhone and the Qi Standard Explained
To enable an easy charging experience, Apple’s iPhone 8 or later contain integrated wireless charging. The iPhone has a glass back that works with Qi-certified chargers which are available as accessories in hotels, cafes, cars, airports, etc. In general, any Qi-enabled wireless charger will have 5W of charging because that is the base minimum. When wirelessly charging, there is currently two charging speeds available for iPhone users: the 5W and 7.5W. You will have to make sure your wireless charger supports 7.5W wireless charging. Created when the iPhone adopted “fast” wireless charging, the 7.5W is a special use case.
The Qi Standard Explained
Qi is an open, universal charging standard created by the Wireless Power Consortium (WPC). Mobile device manufacturers that are working with the standard include Apple, Asus, Google, HTC, Huawei, LG Electronics, Motorola Mobility, Nokia, Samsung, BlackBerry, Xiaomi, and Sony.
Qi defines wireless power transfer using inductive charging over distances of up to 1.6 inches, Developed by the WPC, the system uses a charging pad and a compatible device, which is placed on top of the pad, charging through resonant inductive coupling.Under the Qi specification, "low power" inductive transfers deliver power below 5 W using inductive coupling between two planar coils. These coils tend to be 5 mm apart, however they can be up to 40 mm apart.
Regulation of the output voltage is provided by a digital control loop where the power receiver communicates with the power transmitter and requests more or less power. Communication is unidirectional from the power receiver to the power transmitter via backscatter modulation. In backscatter modulation, the power-receiver coil is loaded, changing the current draw at the power transmitter. These current changes are monitored and demodulated into the information required for the two devices to work together. (Source: Wikipedia)
Qi Standard Incorporation
The Qi standard, first released in 2008, had been incorporated into more than 140 smartphones, tablets and other devices by 2016. In 2012, Nokia first adopted Qi in its Lumia 920 phone. Later that year, the Google/LG Nexus 4 followed. In 2015, IKEA introduced lamps and tables with integrated wireless chargers, As well, The Lexus NX introduced an optional Qi charging pad in the center console.
In 2015, an estimated 120 million wireless charging phones were sold. The Samsung Galaxy supported both Qi and the competing Power Matters Alliance standards. By early 2017, Qi had superseded the competing standards. On September 12, 2017, Apple announced that their new smartphones, the iPhone 8, iPhone 8 Plus, and the iPhone X, all will support the Qi standard.
There are many Qi-certified chargers available on the market with charging mats which charge an iPhone with the latest version of iOS at rates up to 7.5 watts. The iPhone 8 and later + can wireless charge. Other brand companies include: Samsung, Sony, LG, Nokia, Huawei, Microsoft Lumia, Google, Nexus, and BlackBerry.
How to Wireless Charge Your iPhone
- Connect your charger to power.
- Use the power adapter that came with your accessory or a power adapter recommended by the manufacturer.
- Place your iPhone on the wireless charger with the display facing up. Make sure the middle of the phone lines up with your wireless charger. For best performance, place it in the center of the charger or in the location recommended by the manufacturer.
- Your iPhone should start charging a few seconds after you place it on your wireless charger.
Your iPhone will display it’s charging the same way it does when your iPhone is plugged in over USB and charging. If your wireless charging has an LED light, make sure it is lit. Magnetic cases, mounts, or other items that have magnetic properties situated between your iPhone and the charger could reduce performance or damage the magnetic strips or RFID chips. This is because wireless charging uses magnetic induction to charge your iPhone. Don't place anything like a credit card between your iPhone and the charger. It is best to remove all sensitive items before charging. In addition, your iPhone won't charge wirelessly when connected to USB, however, if your iPhone is connected to your computer with USB, or if it's connected to a USB power adapter, it will charge using the USB connection.
Zendure’s Q4 Luxury Wireless Charger Bundle (QC 3.0 AC adapter included) is an example of a quality iPhone wireless charger. Enjoy the 7.5W rapid charging for iPhone Xs Max/ XR/ X/ 8/ 8 Plus and 10W fast charging for Samsung Galaxy S9+/ S9/ S8+/ S8/ S7 / S7 Edge / S6 Edge Plus / Note 5 series devices when using Quick Charge 2.0/3.0 charger.
Wireless charging your iPhone means less wear and tear on both ports and cable life. Most are lightweight and can be used with a wireless battery charger for traveling. Fewer cables frees up the phone port for other uses. It reduces the chance of a power surge to the phone. It can charge multiple devices at the same time with larger charging pads. Newer phones charge faster at 7.5 watts, 9 watts, or even 15 watts. As well, wireless charging pads release negligibly low levels of EMF and the Qi standard includes radiation shielding.