What are the foreign body detection indicators in Qi certification?

In the BPP (maximum transmission power less than or equal to 5W) certification process, the metal is placed between the transmitter and the receiver until the transmitter detects a foreign object. If the temperature rise of the metal is less than a certain threshold, the foreign object detection function is considered Is qualified.

In the EPP (maximum transmission power greater than or equal to 15W) certification process, in addition to the BPP certification requirements, Q-value detection requirements are also added. The Q value detection will be introduced in more detail later. Q-value detection can ensure that metal foreign objects are detected between the transmitter and the receiver before power transmission, further enhancing the safety of the high-power wireless charging system. This is one of the biggest differences between EPP and BPP.

Therefore, Qi certification ensures that the wireless charging system is safe. If you are a wireless charging consumer, you must choose a Qi-certified wireless charger. All Volta Semiconductor products, whether the wheel is the transmitter or the receiver, have passed Qi certification, covering BPP and EPP.