Multi-Coil Wireless Charging with Leakage Current Blocking
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Solution Overview
Problem
Existing wireless charging systems face inefficiencies in power transmission due to misalignment of coils, leading to heating and reduced charging efficiency, especially when charging devices with different power requirements, and they struggle to effectively block leakage currents between coils.
Innovation Solution
An electronic device with multiple wireless charging coils, where a control circuit manages power transmission based on data packets from external devices, using separate coils for different devices and incorporating a current blocking circuit to prevent leakage current, and an inductance element to compensate for inductance differences, ensuring efficient power transfer and minimizing heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single wireless charging coil is used, then the device structure is simple, but it cannot effectively charge multiple devices with different power requirements simultaneously
Solution Approach 1:
The wireless charging system is segmented into multiple independent coils (first coil and second coil), each capable of charging different devices. The first coil is configured for charging a first type of device while the second coil charges a second type of device, allowing simultaneous multi-device charging with different power requirements.
Solution Approach 2:
The wireless charging device is designed with multi-functionality by incorporating multiple coils that can serve different charging purposes. Each coil can be independently controlled to charge different types of external devices, making the system universal in handling various device types and power requirements.
2Productivity
If coils are positioned close together to maximize power transmission, then charging efficiency is improved, but leakage current between coils increases
Solution Approach 1:
A current blocking circuit is introduced as an intermediary between the first and second coils. This circuit selectively blocks leakage current while allowing the magnetic fields to interact for wireless power transmission. The current blocking circuit thus mediates between the need for close coil positioning and the need to prevent harmful leakage currents.
3Productivity
If alignment between transmitting and receiving coils is required for maximum efficiency, then power transmission is optimized, but the ease of operation is reduced due to positioning requirements
Solution Approach 1:
The charging surface is segmented into multiple coil regions, each optimized for specific device types. This segmentation allows users to place different devices on different coil regions without requiring precise alignment across the entire surface, thereby maintaining ease of operation while preserving transmission efficiency for each device-coil pair.
4Adaptability or versatility
If multiple coils are used to charge different devices, then adaptability is improved, but electromagnetic interference between coils increases
Solution Approach 1:
A shielding structure is introduced as a mediator between the first and second coils to block electromagnetic interference. The shielding structure allows the coils to operate independently without mutual interference, enabling the system to maintain high adaptability for different device types while preventing harmful electromagnetic interactions between the coils.
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
The solution enables high-efficiency power transmission to multiple devices with reduced heating and electromagnetic interference, while effectively blocking leakage currents, thereby improving overall charging performance and device compatibility.
Implementation Method 1
The wireless power transfer technique may include magnetic induction and magnetic resonance
Implementation Method 2
A magnetic induction type wireless power transfer system uses a scheme of transmitting power by using a magnetic field induced to a coil
Data Source
AI summary
An electronic device including a wireless charging coils, and an operating method thereof are provided. The electronic device includes a housing including a concave portion couplable to a protrusion of one or more external electronic devices, a first coil stored inside the housing, a second coil stored inside the housing, and disposed between the first coil and the concave portion, a power transmission circuit including a first connecting terminal electrically coupled to the first coil and a second connecting terminal electrically coupled to the second coil, and a control circuit. The control circuit configured to check a data packet received from the external electronic device which is in proximity to the electronic device, control to transmit first designated power to the external electronic device through the first coil wirelessly, and second designated power to the external electronic device through the second coil wirelessly by using the power transmission circuit.