Multi-Layer Wireless Charging Coils for Misalignment and Faster Charging
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Solution Overview
Problem
The electromagnetic induction scheme for wireless charging using a single coil results in slow charging speed and low efficiency due to the need for precise alignment of coils between the wireless charging device and the electronic device.
Innovation Solution
A wireless charging device with multiple coils grouped in different layers, where a processor detects the electronic device using at least one coil from each group, transmits a ping signal, identifies the device's position, and wirelessly transmits power using one coil from each group to improve charging speed and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single coil is used for wireless charging, then the device structure is simple, but the charging speed is slow and charging efficiency is low
Solution Approach 1:
The wireless charging device divides the coil system into multiple independent coils (first coil and second coil) arranged in different layers. Each coil can be independently controlled by separate inverters, allowing selective activation based on the electronic device's position and charging requirements, thereby increasing charging speed without requiring all coils to operate simultaneously.
Solution Approach 2:
The patent introduces a vertical dimension by arranging coils in multiple layers (first coil group in a first layer, second coil group in a second layer). This three-dimensional coil arrangement allows the system to address alignment issues from multiple vertical positions, improving charging efficiency by providing more opportunities for effective magnetic coupling with the electronic device.
2Loss of energy
If multiple coils are used for wireless charging, then the charging efficiency is improved, but the alignment requirement between coils becomes more stringent
Solution Approach 1:
The system dynamically selects which coils to activate based on the detected position of the electronic device. The processor controls switches to connect only the necessary coils (from different layers) to the power source, adapting the active coil configuration to the device's position. This dynamic adaptation reduces the stringency of alignment requirements while maintaining high charging efficiency.
Solution Approach 2:
The patent introduces control circuitry (processors, switches, and inverters) as intermediaries between the power source and the coils. These intermediaries enable intelligent selection and activation of specific coil combinations based on real-time detection of the electronic device's position, thereby decoupling the relationship between coil quantity and alignment precision requirements.
3Productivity
If only one coil is activated at a time, then the device complexity is reduced, but the charging rate is limited
Solution Approach 1:
The patent merges multiple coils (first coil and second coil from different layers) to operate simultaneously or in coordinated fashion. By combining the power transmission capabilities of multiple coils, the system achieves a higher charging rate than a single coil could provide, while the control system manages their operation through selective switching.
Solution Approach 2:
The system employs periodic detection and switching operations to manage multiple coils. The processor periodically detects the electronic device's position and adjusts which coils are active, creating a dynamic control rhythm that optimizes charging rate while managing system complexity through structured periodic action rather than continuous complex control.
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 configuration enhances charging speed and efficiency by allowing power transmission using multiple coils, reducing the need for precise alignment and increasing the overall charging rate.
Implementation Method 1
the electromagnetic induction scheme using coils performs charging by wirelessly transferring power from a wireless charging device (i.e., a wireless charging transmitter) to an electronic device (i.e., a wireless charging receiver) while using a magnetic field induced through the coils
Data Source
AI summary
A wireless charging device is provided and includes a first inverter, a first switch electrically connected to the first inverter, a second inverter, a second switch electrically connected to the second inverter, a first coil group connected to the first inverter through the first switch, a second coil group connected to the second inverter through the second switch, and a processor operatively connected to the first inverter, the first switch, the second inverter, the second switch, the first coil group, and the second coil group. The processor detects an electronic device disposed above the wireless charging device through at least one coil in the first coil group or the second coil group, and to wirelessly transmit power to the electronic device by using one coil in the first coil group and one coil in the second coil group.