Wireless Charging Cover Relay for Coil Gap Power Transfer
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Solution Overview
Problem
In wireless charging systems, the efficiency of power reception is reduced when a protective cover is placed on a power reception device due to increased distance between transmission and reception coils, and the cover's load may not receive power during charging.
Innovation Solution
A power relay device is integrated into the cover, equipped with a coil, power reception circuit, wireless communication circuit, and relay control circuit, which wirelessly receives power from a transmission device, relays it to the reception device, and communicates with both to manage power transmission and control operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective cover is placed on the power reception device, then the device is protected, but the distance between transmission and reception coils increases reducing power reception efficiency
Solution Approach 1:
A power relay device is introduced as an intermediary component between the transmission coil and reception coil. This relay device includes a transmission coil that receives power wirelessly from the external charging device and a reception coil that transmits power to the power reception device. The relay device effectively bridges the gap created by the protective cover, maintaining power transmission efficiency while allowing the cover to remain in place.
2Adaptability or versatility
If a protective cover with load is added to the power reception device, then additional functionality is provided, but the load cannot operate during charging due to power availability issues
Solution Approach 1:
The power management system is segmented into distinct power reception and power transmission functions. The power relay device separately manages power reception from the external charging device and power transmission to both the battery and the load. This segmentation allows the load to operate independently during charging by receiving power directly from the relay device's transmission coil, while the battery charges simultaneously through the reception coil.
3Loss of energy
If the power relay device is added to the cover, then power reception efficiency is improved and load operation is enabled, but the device complexity increases
Solution Approach 1:
The power relay device is designed with multi-functionality to reduce overall system complexity. The same transmission and reception coils are used for both power transfer and communication purposes. The relay control circuit manages multiple functions including power reception, power transmission, load control, and communication with both the external charging device and the power reception device. This universal approach allows a single compact device to perform multiple functions that would otherwise require separate components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances power reception efficiency and allows the cover's load to operate by maintaining power transmission and communication while charging, preventing misidentification of the relay device as a foreign object.
Implementation Method 1
a coil; a power reception circuit configured to rectify a power signal received from a power transmission device through the coil
Implementation Method 2
a power reception circuit configured to rectify a power signal received from a power transmission device through the coil
Data Source
AI summary
A power relay device may be included on/in a cover which covers a portable power reception device, and may comprise: a coil; a power reception circuit configured to rectify a power signal received from a power transmission device through the coil; a wireless communication circuit configured to be driven using the power signal received from the power reception circuit and to communicate with the power transmission device and the power reception device using the coil; and a relay control circuit configured to be driven using the power signal received from the power reception circuit and electrically connected to the power reception circuit and the wireless communication circuit. The relay control circuit may be configured to: receive a first received power value indicating power consumed by the power reception device from the wireless communication circuit; and based on the first received power value being received, transmit a second received power value indicating power consumed by the power relay device to the power transmission device using the wireless communication circuit.