Wireless Charging Explained

Are you curious about wireless charging but wary of the technology behind it? Some people might need wireless charging explained to fully understand and trust the technology. Wireless charging, of course, has been a technological marvel in recent years. It works for many, and it may just work for you. After all, the advantages of a wireless charger go beyond convenience. It also includes fast charging, versatility with environments and household integrations, compatibility with multiple devices, and a chance for a clutter-free space. So how does the wireless charger work exactly?


How does the wireless charger work?

Wireless chargers work through a technology called electromagnetic induction, which involves the transfer of energy between two objects through a magnetic field.

Here’s the wireless charger explained:


Wireless Charger Components

  1. Transmitter (Charging Pad) - This is the part that is connected to a power source. It includes a coil, a controller circuit, and of course, the power source.
    Coil: The primary component is a coil of wire (also known as a magnetic loop antenna) through which an alternating current (AC) flows. This creates an oscillating electromagnetic field. The bigger the coil, the more power or energy can travel.
    Controller Circuit: This regulates the flow of electricity and ensures the correct frequency of the AC to optimize energy transfer.
    Power Source: Usually connected to an electrical outlet, which supplies the necessary power to generate the electromagnetic field.
  2. Receiver (Device) - This refers to the device being charged (such as a smartphone). It also contains a coil of wire that receives energy from the electromagnetic field.
    Coil: A coil of wire inside the device (such as a smartphone, smartwatch, or more) that captures the energy from the magnetic field.
    Rectifier Circuit: Converts the induced AC into direct current (DC), suitable for charging the device's battery.
    Battery Management System: This manages the charging process of the device, including regulating the voltage and current to prevent overcharging and overheating.


How a wireless charger works

  1. Generation of Electromagnetic Field
    The charging pad (transmitter) is plugged into an electrical outlet.
    When powered on, an alternating current (AC) flows through the coil in the charging pad.
    This current creates an oscillating magnetic field around the coil.
  2. Induction Process
    When a device with a compatible receiver coil is placed on the charging pad, the magnetic field generated by the transmitter induces a current in the receiver coil.
    This process is based on Faraday's Law of Induction, which states that a change in magnetic field within a closed loop of wire induces an electromotive force (EMF) in the wire.
  3. Conversion to DC
    The induced current in the receiver coil is typically an alternating current.
    The device contains circuitry that converts this AC into direct current (DC), which is used to charge the device’s battery.
    The device's battery is charged until it is full.


Wireless Charger Standards

  • Qi Standard: Most wireless chargers use the Qi (pronounced "chee") standard, developed by the Wireless Power Consortium (WPC). At a glance, it defines specifications for power transfer, communication between the charger and device, and safety measures. Qi standard ensures compatibility between devices and chargers from different manufacturers. It also enables inductive charging among devices and coils. The Qi standard is commonly used by manufacturers, including Apple.


Wireless Charger Additional Features

  • Resonant Induction: Some advanced wireless chargers use resonant charging instead of inductive charging. Unlike inductive charging, where physical contact is necessary between the charging pad and the device, resonant charging allows for greater flexibility in the positioning of the device on the charging pad. In essence, it can work over slightly longer distances.
  • Smart Features: Modern wireless chargers often come with smart features. This includes temperature control, foreign object detection, and multi-device charging capabilities. Brands and manufacturers are continuously improving and developing wireless charging technology for the convenience of many.
  • Charging Speed: Some wireless chargers support fast charging, which delivers higher power (e.g., 10W, 15W, or even higher) compared to standard 5W chargers. Fast charging typically requires both the charger and the device to support higher power levels and include mechanisms to manage increased heat.

Can all phones be charged on a wireless charger?

For individual consumers looking forward to wireless charging, it’s best to remember that not all phones can be charged on a wireless charger. Only phones that are equipped with the necessary hardware and standards for wireless charging can utilize this feature.

Here's how you can determine if your phone can be charged wirelessly:


Check the factors determining wireless charging capability

  • Built-in Hardware: Phones need a built-in receiver coil inside of them that is compatible with the wireless charging standard (commonly Qi). Without this hardware, the phone cannot receive power wirelessly.

Check your phone information and specifications

  • Manufacturer Specification: Check the user manual that came with your phone. You can also visit the manufacturer's website and look for the specifications of your phone model. Contact the customer support center of your phone’s manufacturer for detailed information.Online Research: Simple online research also works. Use search engines to look up your phone model followed by “wireless charging.”
  • Technology Websites: Websites like GSMArena or PhoneArena often list detailed specifications of various phones and devices, including whether they support wireless charging.
  • Phone Settings: Some phones may have settings or options related to wireless charging. Check the settings menu under battery or power settings.
  • Physical Inspection: Phones with glass backs are more likely to support wireless charging, as metal can interfere with the charging process. You can also look for any bundled accessories or mentions in the packaging that indicate wireless charging capability.

Check your phone model

  • Apple iPhones: iPhone 8 and newer models are compatible with wireless charging. This includes the iPhone 8, 8 Plus, X, XR, XS, XS Max, 11 series, 12 series, 13 series, 14 series, and more.
  • Samsung Galaxy Phones: Many from the Galaxy S6 and newer (S6, S7, S8, S9, S10, S20, S21, S22, S23 series, and newer), Note series, and some models in the A series.
  • Google Pixels: Pixel 3 and newer models (Pixel 3, 4, 5, 6, 7, and their variations) are able to charge wirelessly.
  • Other Brands: Many high-end models from LG, Sony, Huawei, and others also support wireless charging for their phones.

In simple words, checking the device specifications through various methods can help determine if your phone can charge wirelessly. Many modern high-end phones already support wireless charging, but it’s not universal across all models, especially older or budget devices. If your phone lacks this feature, you can consider upgrading to a newer phone model that supports wireless charging.


Issues with wireless charging

Of course, you also need to know about the issues or setbacks when it comes to wireless charging explained. While wireless charging offers several conveniences, there are certain drawbacks and issues that users should be aware of.

Here are some of the common issues associated with wireless charging:

  • Efficiency and charging speed - Even though fast wireless chargers are available, they still typically charge devices more slowly than their wired counterparts, especially those that aren’t of high quality.
  • Heat generation - Wireless charging can generate more heat compared to wired charging. Excessive heat can potentially damage the battery over time and reduce its lifespan. Some wireless chargers include cooling mechanisms or temperature management features, but not all do.
  • Alignment sensitivity - Many wireless chargers require precise alignment of the device with the charging coil for optimal charging. Misalignment can lead to slower charging or no charging at all.
  • Interference and obstructions - Metal objects, such as coins or keys, can interfere with wireless charging and even cause overheating if placed between the device and the charger. Thick or metal cases can interfere with the charging process. Users may need to remove certain cases to charge wirelessly.
  • Limited mobility - Unlike wired charging, where you can still use the device while plugged in, using a device while wirelessly charging can be cumbersome, especially if it's on a flat pad.
  • Compatibility issues - Not all devices support wireless charging, and different standards (e.g., Qi, PMA) can lead to compatibility issues.


What are the types of wireless chargers you can use?

Wireless chargers come in various types, especially when made by different manufacturers. Each is designed to suit different needs and preferences, which means you need to be wise with what kind of wireless charger you need.

Here's an overview of the main types of wireless chargers:


Charging Pads
These are flat surfaces where you place your phone to charge. Users can simply place the phone on the pad, ensuring alignment for optimal charging. These are some of the most common wireless charging types, used by both individuals for personal use and establishments.


Charging Stands
These are dedicated stands that hold your phone upright while charging. These are usually ideal for keeping the phone in view for notifications or video calls while it charges.


Magnetic Chargers
These are chargers with magnets that snap onto the back of the phone, ensuring perfect alignment. They provide a more secure attachment for the phone and the charger. These are often used with MagSafe-compatible devices, as well as magnetic or wireless power banks for on-the-go charging.


Wireless Charging Mouse Pads
These are mouse pads that have a built-in wireless charging area. These kinds of wireless chargers are ideal for keeping your phone charged while you work.


Duo Wireless Charger
SOLUM Group also brings ultimate innovation and convenience with a Duo Wireless Charger. This kind of wireless charger has dual charging surfaces for charging two devices, fast charging capabilities, and wide compatibility. It also has a sleek, compact design that will blend with various environments, such as work desks, bedsides, hotels, living rooms, and more.

There are various types of wireless chargers designed to meet different needs—from simple charging pads to multi-device docks and portable options. To choose the right one for your needs, make sure to consider versatility, portability, multiple device compatibility, and overall convenience. 

SOLUM Marketing


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