How does a wireless charger work and what is its principle
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Publish Time: 2024-04-28
A
wireless charger
refers to a charger that does not use a traditional charging power cord to connect the terminal device that needs to be charged. It uses the latest wireless charging technology. Wireless charging technology received 20 patents in 2007. Various devices can use a charging base, and wired charging methods for mobile phones, MP3 players, power tools and other devices will no longer exist. By using the magnetic field generated between coils, inductive coupling technology will become a bridge between the charging base and the device, achieving magical transmission of electrical energy.
Most current chargers, such as those for tablets, charge the device's built-in battery through direct contact with metal wires. The advantage of wireless charging technology is its convenience and versatility. However, its disadvantage is that it is less efficient and can only provide electrical energy. The traditional charging connector not only provides power, but also synchronizes audio and video files to the device through the USB interface. Still, wireless charging technology promises to bring improvements to WiFi and battery technology. For devices that do not require data transmission, this new technology will significantly reduce the number of various chargers required by users. Additionally, with the adoption of wireless charging technology, public mobile device charging stations will become a reality.
Wireless chargers work using the principle of electromagnetic induction to achieve wireless transmission of electrical energy. There is a transmitting coil inside the wireless charger. When the power is turned on, the transmitting coil will generate an alternating magnetic field. When a mobile phone or other device that needs to be charged is placed on the charger, the receiving coil in the device senses the magnetic field generated by the transmitting coil. According to Faraday's law of electromagnetic induction, when a changing magnetic field exists between two coils, an induced current is generated in the receiving coil. In this way, the receiving coil in the device can convert the electrical energy into direct current, which can be supplied to the device for charging, thereby filling the battery in the device or used for direct power supply. It should be noted that the effect and charging distance of the wireless charger will be affected by factors such as the distance, relative position, and coil design between the transmitting coil and the receiving coil. Therefore, to ensure optimal charging, it is often necessary to place the device closely or at a close distance from the charger.
Convenience: Wireless chargers eliminate the need to plug and unplug the charging cable. Users only need to place the device on the charger to start charging, which greatly improves the convenience of charging. This contactless charging method is especially suitable for driving, office, travel and other scenarios. Users do not need to worry about the entanglement of cables or the inconvenience of plugging and unplugging.
Versatility: Since wireless chargers adopt a unified charging standard, devices of different brands and models can be charged with the same charger as long as they support wireless charging. This greatly reduces the number of chargers users need to carry and manage, making charging simpler and more efficient.
Safety: Wireless chargers reduce the risk of equipment damage or electric shock due to improper plugging and unplugging of charging cables to a certain extent. At the same time, some high-end wireless chargers are also equipped with overheating, overvoltage, overcurrent and other protection mechanisms to further ensure the safety of the charging process.
Aesthetics: Wireless chargers usually have a simple design and beautiful appearance, and can be well integrated into various home and office environments. At the same time, there is no restriction of cables, making the desktop or space cleaner.
Environmental protection: Wireless charging reduces the use of cables and reduces the generation of electronic waste, which is beneficial to environmental protection. In addition, because the wireless charger can support charging of a variety of devices, it reduces the frequency of charger replacement due to device updates and indirectly reduces the waste of resources.
It should be noted that although wireless chargers have many advantages, their charging efficiency may be slightly lower than wired charging, and the cost is usually higher. Therefore, when choosing whether to use a wireless charger, users need to weigh it based on their actual needs and budget.
Most current chargers, such as those for tablets, charge the device's built-in battery through direct contact with metal wires. The advantage of wireless charging technology is its convenience and versatility. However, its disadvantage is that it is less efficient and can only provide electrical energy. The traditional charging connector not only provides power, but also synchronizes audio and video files to the device through the USB interface. Still, wireless charging technology promises to bring improvements to WiFi and battery technology. For devices that do not require data transmission, this new technology will significantly reduce the number of various chargers required by users. Additionally, with the adoption of wireless charging technology, public mobile device charging stations will become a reality.
How does a wireless charger work?
Wireless chargers work using the principle of electromagnetic induction to achieve wireless transmission of electrical energy. There is a transmitting coil inside the wireless charger. When the power is turned on, the transmitting coil will generate an alternating magnetic field. When a mobile phone or other device that needs to be charged is placed on the charger, the receiving coil in the device senses the magnetic field generated by the transmitting coil. According to Faraday's law of electromagnetic induction, when a changing magnetic field exists between two coils, an induced current is generated in the receiving coil. In this way, the receiving coil in the device can convert the electrical energy into direct current, which can be supplied to the device for charging, thereby filling the battery in the device or used for direct power supply. It should be noted that the effect and charging distance of the wireless charger will be affected by factors such as the distance, relative position, and coil design between the transmitting coil and the receiving coil. Therefore, to ensure optimal charging, it is often necessary to place the device closely or at a close distance from the charger.
Wireless chargers have the following significant advantages
Convenience: Wireless chargers eliminate the need to plug and unplug the charging cable. Users only need to place the device on the charger to start charging, which greatly improves the convenience of charging. This contactless charging method is especially suitable for driving, office, travel and other scenarios. Users do not need to worry about the entanglement of cables or the inconvenience of plugging and unplugging.
Versatility: Since wireless chargers adopt a unified charging standard, devices of different brands and models can be charged with the same charger as long as they support wireless charging. This greatly reduces the number of chargers users need to carry and manage, making charging simpler and more efficient.
Safety: Wireless chargers reduce the risk of equipment damage or electric shock due to improper plugging and unplugging of charging cables to a certain extent. At the same time, some high-end wireless chargers are also equipped with overheating, overvoltage, overcurrent and other protection mechanisms to further ensure the safety of the charging process.
Aesthetics: Wireless chargers usually have a simple design and beautiful appearance, and can be well integrated into various home and office environments. At the same time, there is no restriction of cables, making the desktop or space cleaner.
Environmental protection: Wireless charging reduces the use of cables and reduces the generation of electronic waste, which is beneficial to environmental protection. In addition, because the wireless charger can support charging of a variety of devices, it reduces the frequency of charger replacement due to device updates and indirectly reduces the waste of resources.
It should be noted that although wireless chargers have many advantages, their charging efficiency may be slightly lower than wired charging, and the cost is usually higher. Therefore, when choosing whether to use a wireless charger, users need to weigh it based on their actual needs and budget.
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