When choosing a coil for a wireless charging application, there are several factors you should consider, our specialists advise accordingly:
- Coil Type: There are generally two types of coils used in wireless charging applications: transmitter (TX) coils and receiver (RX) coils. TX coils are used in the charging station or pad, while RX coils are integrated into the device being charged. Ensure you select the appropriate coil type for your specific application.
- Coil Size and Shape: The size and shape of the coil will determine the charging range and efficiency. Larger coils can typically provide a longer charging range, but they may be less efficient. Consider the space available for the coil in your device and the desired charging distance when choosing the size and shape.
- Inductance: The inductance of the coil affects the charging efficiency and power transfer. Higher inductance generally improves the charging efficiency but may also increase the coil size and cost. It’s essential to balance the inductance with other design considerations.
- Resonance Frequency: Wireless charging often utilizes resonant coupling, where the transmitter and receiver coils resonate at the same frequency for efficient power transfer. Ensure that the resonant frequency of the coil matches the frequency of the charging system you’re using
- Quality and Reliability: Look for high-quality coils from reputable suppliers to ensure reliability and longevity. Coils made with good materials and manufacturing processes are less prone to heating, power loss, and electromagnetic interference.
- Power Handling: Consider the power requirements of your application. Higher-power applications will require coils that can handle increased power levels without overheating or suffering performance degradation
- Efficiency: The efficiency of the coil affects the charging speed and energy consumption. Look for coils with high efficiency to minimize power loss and optimize charging performance.
- Environmental Factors: Consider the operating environment of your wireless charging application. Factors such as temperature, humidity, and electromagnetic interference can affect coil performance. Ensure the chosen coil can withstand the expected environmental conditions.
- Regulatory Compliance: Ensure that the chosen coil meets relevant regulatory standards and certifications, such as those related to electromagnetic compatibility (EMC) and safety.
- Cost: Evaluate the cost-effectiveness of the coil, considering factors like the unit price, manufacturing requirements, and the overall budget for your wireless charging solution.
It’s important to note that specific design considerations may vary depending on the wireless charging technology you’re using (e.g., Qi standard, resonant charging, etc.) and the specific requirements of your application. Consult our experts who along with the engineers at Elec&Eltek, one of the original pioneers of wireless charging can assist you in your selection. We have standard ranges of low power and medium power coils, if these are not suitable a custom solution can be offered.