Inductive Charging Coil Coupling Detection via Resonant Pings
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Inductive charging systems face inefficiencies in detecting coil coupling, leading to unnecessary power consumption and delayed response times due to periodic pinging, which can be burdensome and unsafe, especially when devices are not present for charging.
Innovation Solution
The implementation of a receiver device with a first and second resonant circuit, along with a switch, allows for efficient detection of coil coupling by transmitting pings at different frequencies and analyzing current inputs, enabling adaptive power management and communication through inductive coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If periodic pinging is used to detect coil coupling, then the charging device can detect the presence of the electronic device, but power is consumed needlessly when the device is not present and response time is delayed
Solution Approach 1:
The system uses periodic pinging at different time intervals to detect coil coupling. By adjusting the ping interval dynamically, the system balances between reliable detection and power conservation. When coupling is detected, pinging frequency increases for accurate communication; when no coupling is detected, pinging interval extends to reduce power consumption.
Solution Approach 2:
The system implements feedback mechanisms where the response from the electronic device (or lack thereof) determines future pinging behavior. If no response is received within expected timeframes, the system adjusts its detection strategy, extending intervals or changing ping characteristics, thereby optimizing power usage while maintaining detection reliability.
2Use of energy by moving object
If the time interval between pings is increased to save power, then power consumption is reduced, but the response time of the charging device is slowed
Solution Approach 1:
The ping interval is made dynamic rather than fixed. The system continuously adapts the time interval between pings based on operational conditions, detection state, and power availability. This dynamic adjustment allows the system to minimize power consumption during idle periods while ensuring rapid response when coupling is detected or required.
Solution Approach 2:
The system performs preliminary detection actions at optimized intervals to prepare for potential charging operations. By conducting lightweight detection ping s in advance at power-efficient intervals, the system prepares the detection state without committing to continuous high-power operation, thus balancing response readiness with power savings.
3Adaptability or versatility
If multiple power supplies with different power outputs are used, then different device charging requirements are met, but the system becomes burdensome to use, store, and transport
Solution Approach 1:
The inductive charging system provides universal charging capability through electromagnetic coupling that can accommodate multiple device types and power requirements through a single charging surface. The system dynamically adjusts power output and detection parameters to support different device specifications, eliminating the need for multiple dedicated power supplies while maintaining charging compatibility across device types.
Solution Approach 2:
The inductive charging surface acts as an intermediary between the power source and various electronic devices. It provides a universal interface that mediates the connection between different device charging requirements and the power supply, enabling multiple devices with different power needs to be charged through a single standardized inductive interface without requiring physical connectors or multiple power adapters.
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 reduces power consumption and enhances response times by accurately determining coil coupling, allowing for efficient energy transfer and communication, while minimizing unnecessary power usage and safety hazards.
Implementation Method 1
a first resonant circuit operatively connected in series between the receiver coil and the input of the AC-to-DC converter, and a second resonant circuit operatively connected in parallel with the receiver coil... The first resonant circuit is associated with a first resonant frequency and the second resonant circuit is associated with a second resonant frequency
Implementation Method 2
inductive charging system... transmitter device transmitting pings to a receiver device... detecting coupling between a receiver coil and a transmitter coil in an inductive power transfer system
Data Source
AI summary
An inductive charging system can include a transmitter device and a receiver device. The transmitter device may be adapted to detect when a receiver coil in the receiver device is coupled to a transmitter coil in the transmitter device. For example, the current input into a DC-to-AC converter in the transmitter device can be measured and coil coupling detected when the current equals or exceeds a threshold value.