Wireless Charging Coils

Wireless Charging Receiving Coil

A wireless charging receiving coil is a critical component in wireless power transfer systems, enabling devices to draw power from an electromagnetic field without the need for physical connections. These coils are typically found in smartphones, wearables, and other electronic devices that support wireless charging.

Definition:
A receiving coil is a loop of conductive material, often copper or aluminum, that is designed to resonate at a specific frequency when an alternating magnetic field is applied. It captures the energy from the transmitting coil and converts it into electrical current to charge the device's battery.

Function:
The primary function of a receiving coil is to:
1. Tune into the frequency of the transmitting coil to establish a resonant connection.
2. Inductively couple with the transmitting coil to receive the electromagnetic energy.
3. Convert the received electromagnetic energy into direct current (DC) through a rectifier circuit.
4. Regulate and manage the power to charge the device's battery safely and efficiently.

Applications:
Receiving coils are used in a variety of applications, including:
1. Consumer electronics like smartphones, tablets, and smartwatches.
2. Electric vehicles (EVs) for inductive charging.
3. Medical devices that require wireless charging to avoid the risk of infection from wired connections.
4. IoT devices and sensors for continuous, untethered operation.
5. Home and office furniture with built-in charging capabilities.

Selection Criteria:
When choosing a wireless charging receiving coil, consider the following standards:
1. Compatibility: Ensure it is compatible with the wireless charging standard your device supports, such as Qi or PMA.
2. Efficiency: Look for coils with high energy transfer efficiency to minimize power loss.
3. Size and Shape: The coil should fit within the device's design constraints without compromising performance.
4. Frequency: The coil should resonate at the frequency used by the wireless charging system to maximize power transfer.
5. Safety: It should include safety features to prevent overcharging and overheating.
6. Certification: Check for certification by recognized standards organizations to ensure quality and reliability.

In summary, wireless charging receiving coils are essential for enabling contactless power transfer in a wide range of devices, and their selection should be based on compatibility, efficiency, size, frequency, safety, and certification.
Please refer to the product rule book for details.