Wireless Charging Loss Scaling for Foreign Object Detection
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Solution Overview
Problem
In wireless charging systems, accurately estimating power losses due to foreign objects and magnetic interactions between diverse transmitter-receiver pairs is challenging, leading to potential inefficiencies and safety risks.
Innovation Solution
Implementing ecosystem scaling techniques that use shared inductive-loss scaling factors, characterized by measuring and exchanging magnetic power loss parameters between transmitters and receivers, to enhance accuracy in power loss estimation and ensure safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If wireless power transmitting devices transmit power to multiple types of receiving devices using fixed power loss parameters, then device complexity is reduced, but measurement precision of power loss estimation deteriorates
Solution Approach 1:
The system dynamically adjusts power loss parameters based on the specific transmitter-receiver pairing. Instead of using fixed parameters, the system exchanges scaling factors between devices and calculates adjusted parameters (e.g., adjusted transmitter power loss parameter = base parameter × scaling factor) to adapt to different device combinations, thereby maintaining measurement precision across diverse device types.
Solution Approach 2:
The patent changes the power loss parameters based on the specific transmitter and receiver models being used. By introducing model-specific scaling factors and adjusting parameters like transmitter power loss parameter and receiver power loss parameter according to the actual device pairing, the system achieves accurate power loss estimation without requiring completely separate parameter sets for each device combination.
2Measurement precision
If ecosystem scaling techniques with shared inductive-loss scaling factors are implemented, then measurement precision of power loss estimation is improved, but device complexity increases
Solution Approach 1:
The system implements a universal scaling factor exchange mechanism that works across all transmitter and receiver model combinations. Instead of creating dedicated parameter sets for each device pair, the patent uses a universal approach where scaling factors are exchanged and applied to base parameters, allowing the same framework to handle diverse device types while maintaining measurement precision.
Solution Approach 2:
The patent introduces scaling factors as intermediary parameters that mediate between the base power loss parameters and the actual power loss estimation for specific device pairings. These scaling factors act as a bridge, allowing the system to maintain simple base parameters while achieving accurate estimates through the intermediary scaling adjustment process.
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 precise determination of foreign object power loss and efficient wireless power transfer by accounting for varying magnetic properties across different device models, ensuring normal operations and user notification of charging status.
Implementation Method 1
The wireless power transmitting device uses a wireless power transmitting coil to transmit wireless power signals to the wireless power receiving device
Implementation Method 2
The wireless power receiving device may be magnetically coupled to wireless power transmitting devices so that power may be transferred from the transmitting devices to the receiving devices
Implementation Method 3
The rectifier circuitry converts the received signals into direct-current power
Data Source
AI summary
A wireless power system has a wireless power transmitting device with a wireless power transmitting coil and an inverter. The inverter and wireless power transmitting coil are used to transmit wireless power signals. The wireless power system also has a wireless power receiving device configured to receive the wireless power signals using a wireless power receiving coil. A rectifier in the wireless power receiving device rectifies alternating-current signals from the wireless power receiving coil and produces corresponding direct-current power. Power loss calculations may be used to help determine whether a foreign object might be present in the vicinity of a coupled wireless power transmitter and receiver. In an ecosystem with multiple models of transmitter and multiple models of receiver, model-dependent scaling factors may be maintained and exchanged between a given coupled transmitter and receiver pair to allow accurate power loss estimates to be made.