Wireless PowerShare (Reverse Wireless Charging): what it is, how it works and what it does

Definition and Operating Principle

Wireless PowerShare is a reverse wireless charging feature that enables a smart device, typically a smartphone, to function as a charging base for other compatible devices. This mechanism inverts the usual energy flow: instead of receiving power from an external source, the primary device transmits energy through its back surface.

Architecture and Technical Specifications

Implementing this technology requires the transmitting device to have a wireless transmission circuit and a battery with sufficient capacity to sustain the transfer. According to available evidence, the standard output power for this function is set at 4.5 W. This figure indicates that the energy transfer is moderate, designed to keep small accessories charged or to provide emergency charging to another smartphone, but not to rapidly recharge large-capacity batteries.

Applications and Scope

• Accessory Charging: Allows charging small devices such as wireless earbuds or smartwatches directly on the back of the smartphone.
• Emergencies: Serves as a provisional solution for charging another phone when there is no access to a wall outlet or a dedicated charging base.

Limitations

Due to the limited power of 4.5 W, the charging speed is significantly slower than cable charging or high-power charging bases. Additionally, the efficiency of wireless transfer is lower than conductive methods, implying greater heat dissipation and faster consumption of the transmitting device's battery.

Interpretation in Products

The presence of Wireless PowerShare in a product's technical specifications indicates that the device supports the reverse wireless charging standard. Users should interpret this feature as a convenience function for accessories or emergency situations, and not as a substitute for primary cable charging or high-power charging bases.