Multi-Coil Wireless Charging With Frequency-Filtered ASK Signaling
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Solution Overview
Problem
Conventional wireless charging systems face challenges in efficiently and effectively charging multiple devices simultaneously on a multi-coil charging surface, particularly due to interference and the need for improved control over charging procedures.
Innovation Solution
The implementation of a multi-coil wireless charging device with a controller that can locate and configure transmitting coils to optimally charge receiving devices, using advanced sensing techniques and selective activation of coils to minimize interference and enhance charging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional wireless charging systems use a single transmitting coil and basic Ping protocol, then the system is simple and easy to manufacture, but it cannot efficiently charge multiple devices simultaneously and causes interference when multiple devices are placed on the charging surface
Solution Approach 1:
The charging surface is divided into multiple independent transmitting coils arranged in a grid pattern, allowing each coil to independently charge a device placed above it. This segmentation enables simultaneous charging of multiple devices without interference between coils, as each coil can be selectively activated based on device presence and charging requirements
Solution Approach 2:
The system dynamically selects and activates specific transmitting coils based on real-time detection of device presence, position, and charging status. The controller continuously monitors the charging surface and adjusts which coils are active, enabling adaptive multi-device charging optimization
2Measurement precision
If the transmitting base station pings frequently to detect device presence, then device detection accuracy is improved, but power consumption increases significantly
Solution Approach 1:
Instead of continuous or frequent periodic pinging, the system uses opportunistic detection during normal charging operations. The controller leverages the existing charging current flow to detect device presence and status, eliminating the need for separate high-frequency Ping operations and significantly reducing power consumption while maintaining accurate device detection
Solution Approach 2:
The system uses the charging process itself to detect device presence and status. By monitoring the electrical characteristics of the charging circuit during normal operation, the system automatically detects when devices are placed on the surface, their charging status, and when they are removed, without requiring additional detection power
3Productivity
If multiple transmitting coils are activated simultaneously to charge multiple devices, then charging capacity is improved, but interference between coils increases and reduces charging efficiency
Solution Approach 1:
The charging surface is divided into multiple independent transmitting coils arranged in a grid pattern, allowing each coil to independently charge a device placed above it. This segmentation enables simultaneous charging of multiple devices without interference between coils, as each coil can be selectively activated based on device presence and charging requirements
Solution Approach 2:
Each transmitting coil is independently controlled and optimized for its local region of the charging surface. The system activates only the specific coils needed for current charging tasks, allowing each active coil to operate at optimal power levels without contributing to interference in other regions, thus maintaining high charging efficiency across multiple simultaneous charging zones
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 enables efficient and concurrent charging of multiple devices on a free-positioning charging surface, reducing interference and improving the overall capacity and efficiency of wireless power transmission.
Implementation Method 1
a transmitting coil in a wireless charging device coupled to a receiving coil in a power receiving device
Implementation Method 2
a resonant capacitor that has a capacitance (C) is coupled to the transmitting coil to obtain a resonant LC circuit
Data Source
AI summary
Systems, methods and apparatus for wireless charging are disclosed. One method includes providing a first charging current to a first transmitting coil in a wireless charging device, where the first transmitting coil is coupled to a receiving coil in a first power receiving device, providing a second charging current to a second transmitting coil in the wireless charging device, where the second transmitting coil is coupled to a receiving coil in a second power receiving device, the first charging current and the second charging current being provided at different frequencies from one another, receiving a first modulated signal from the first power receiving device, where the first modulated signal includes a carrier signal provided at a frequency corresponding to the frequency of the first charging current, and filtering the first modulated signal using a band-pass filter configured to block a second modulated signal transmitted by the second power receiving device.