Circuit module and solution for wireless charging system
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Circuit module and solution for wireless charging system
How users interact with the device is one of the most basic questions that every good engineer must ask at the start of a project. Do customers need to charge quickly? Need flexibility in alignment? Do you need low calories? Do you need long-distance charging? Do you need high power? Do I need multiple receivers for each transmitter? Do you need a small form factor? All of these options are fine, but usually you need to compromise. For example, high power and low heat are not always satisfied at the same time. Distance and efficiency are basically the opposite. Therefore, understanding user needs and prioritizing these requirements is a very important first step in designing a wireless charging system for devices.
Efficiency is always a top priority in the metrics used to measure the performance of wireless charging systems. An efficient system provides longer distance, better directional flexibility, lower heat generation, smaller size, and lower power leakage. Below are the three main modules that have a decisive influence on the efficiency of wireless charging systems.
3 modules of wireless charging system
If all three modules are operating at the lowest estimated efficiency (80%, 70%, and 80% as shown), the overall system efficiency is approximately 45%. For 5W devices, 11W transmit power is required to charge at full speed. In addition, about 6W is consumed by the device itself and the surrounding environment (air, device, body tissue, etc.). In low power situations this may be safe and acceptable. However, at higher powers, such as charging an electric vehicle, the typical charging power is at least 5 kW, so 6 kW is lost in the transmitter, the car and the surrounding environment, thus causing serious thermal and safety issues. cause. If all three modules of the wireless charging system are operating at the highest estimated efficiency (ie 95%, 90%, and 95%), the overall system efficiency is about 82%. In this case, a 5W device requires only about 6W of charging power from the transmitter, and only 1W is lost due to disabling. To improve system efficiency, designers should focus on high efficiency components and increase the coupling between transmitter and receiver.
Panasonic wireless charging reference design
Panasonic wireless power control ICs support all devices (DSC, DVC, Walkman, mobile phones, smartphones, etc.) in accordance with WPC (Wireless Charging Alliance) WPC1.1 (Qi standard). Panasonic's wireless power solution controls the power transfer by using a transmitter control IC (NN32251A, charger) for the power transmitter (charger) and a receiver control IC (AN32258A) for the receiver (device). Use the.