Multi-Coil Wireless Charging With ASK Channels for Concurrent Devices
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Solution Overview
Problem
Conventional wireless charging systems face challenges in efficiently charging multiple devices simultaneously and managing complex communication protocols, particularly in multi-coil, multi-device configurations, due to interference and the need for precise positioning of devices on the charging surface.
Innovation Solution
A multi-coil wireless charging system with a matrix configuration of charging cells and a controller that selectively activates coils and uses multi-frequency ASK modulation to ensure each device has a private communication channel, allowing for concurrent charging and communication without interference, and a scheduling scheme to manage digital pings and prevent disruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional wireless charging systems use a single resonant LC circuit for charging, then basic charging capability is provided, but the system cannot efficiently charge multiple devices simultaneously and suffers from interference in multi-device configurations
Solution Approach 1:
The charging surface is divided into multiple independent charging cells, each with its own resonant LC circuit and transmitting coil. Each cell can independently detect and charge devices placed on it, enabling simultaneous charging of multiple devices without interference between cells.
Solution Approach 2:
The system transitions from a single-plane charging approach to a multi-layer three-dimensional configuration with charging cells arranged in stacked layers. This vertical dimensionality allows multiple devices to be charged simultaneously at different positions and orientations on the charging surface.
2Speed
If digital pings are sent frequently to detect device presence, then device detection speed is improved, but power consumption increases significantly
Solution Approach 1:
Instead of continuous or frequent pinging, the system uses periodic digital pings at optimized intervals. The resonant LC circuits are excited periodically to detect device presence, reducing unnecessary power consumption while maintaining effective device detection capability.
Solution Approach 2:
The system leverages the natural resonant response of the LC circuits and the devices themselves. When a device is placed on a charging cell, the periodic excitation automatically induces a detectable response from the device's receiving coil, eliminating the need for complex active scanning or high-power continuous transmission.
3Quantity of substance
If multiple devices are charged on the same charging surface, then charging capacity is improved, but communication interference occurs between devices
Solution Approach 1:
Each charging cell operates as an independent communication zone with its own resonant frequency. Devices communicate with their respective charging cells through dedicated ASK-modulated channels, preventing communication interference even when multiple devices are charged simultaneously on different cells or layers.
Solution Approach 2:
The system uses amplitude shift keying (ASK) modulation with different carrier frequencies for different charging cells. By varying the frequency parameter of the communication signals, the system enables simultaneous independent communication between multiple device-transmitter pairs without mutual interference.
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
Enables efficient and interference-free concurrent charging of multiple devices on a single surface, regardless of their position, by using a matrix configuration of coils and selective activation, and multi-frequency communication to prevent collisions and ensure reliable data exchange.
Implementation Method 1
a transmitting coil in a charging cell may be configured to direct an electromagnetic field through a power transfer area
Implementation Method 2
The transmitter coil has an inductance (L) and, a resonant capacitor that has a capacitance (C) is coupled to the transmitting coil to obtain a resonant LC circuit
Implementation Method 3
A receiving coil in a receiving device may be configured to sense changes in an electromagnetic field
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.