What is the role of self-calibration in FOD?

In the WPC protocol, the self-calibration method is specifically introduced, and it is recommended that the production process of the transmitter has a self-calibration process to ensure the consistency of the FOD performance of the transmitter. According to the above introduction, with a good FOD algorithm, the transmitter will calculate all the losses at the transmitter. Some of these losses come from the loss of the transmitting end circuit, the loss of the transmitting end magnetic material and surrounding metal. The same product, different samples, there will be some differences in packaging and materials. In this way, using the same set of parameters to calculate the loss of the transmitting end will cause errors between different products. Therefore, it is best to perform a self-calibration of the products before shipment to correct the errors between different products and ensure the consistency of product performance. sex. Especially products with a metal shell around the coil require a self-calibration process.