Wireless Charging Negotiation via Coil Impedance Detection
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Solution Overview
Problem
Regulating the flow of wireless power in wireless charging systems is challenging, particularly in systems with adjustable settings, as determining the optimal settings for effective power transmission to electronic devices is difficult.
Innovation Solution
A wireless power transmission system that uses measurement circuitry, such as coil impedance and impulse-response circuitry, to monitor the charging surface for the presence of a receiving device and establish a communication link, allowing for the transmission of power transmission capabilities and settings, including duty cycle, modulation schemes, frequency, and power limits, which are selected by the receiving device based on its sensor readings and battery state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wireless power transmission uses adjustable operating settings to optimize power delivery, then power transmission effectiveness is improved, but system complexity increases
Solution Approach 1:
The patent implements dynamic adjustment of power transmission settings by having the receiving device select optimal operating parameters (duty cycle, modulation scheme, frequency, power limits) based on real-time sensor readings and battery state, then communicate these selections back to the transmitting device. This allows the system to adapt to changing conditions while maintaining manageable complexity through automated negotiation.
Solution Approach 2:
The system changes multiple transmission parameters including duty cycle settings, power modulation scheme settings (PWM, AM, phase shift), sleep timer settings, frequency settings, and power limits/thresholds. These parameter changes enable optimized power delivery while the automated negotiation process keeps the control complexity manageable.
2Productivity
If the system establishes communication link and negotiates settings before power transmission, then power transmission optimization is improved, but startup time increases
Solution Approach 1:
The patent performs preliminary actions by establishing communication links and negotiating optimal transmission settings before actual power transmission begins. The receiving device selects appropriate settings based on its initial state and communicates these to the transmitting device in advance, ensuring optimized power delivery from the start while minimizing startup delay through efficient negotiation protocols.
Solution Approach 2:
The system uses feedback mechanisms where the receiving device monitors its own state (sensor readings, battery charge state, active components) and communicates this information back to the transmitting device. This feedback loop enables the transmitting device to adjust power transmission settings in real-time, optimizing power delivery while maintaining quick response times through continuous bidirectional communication.
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 optimized wireless power transmission by dynamically adjusting settings based on the device's requirements, ensuring effective charging while minimizing interference and power consumption.
Implementation Method 1
The wireless power transmitting device uses measurement circuitry such as coil impedance measurement circuitry or impulse-response circuitry that makes coil inductance measurements to monitor the charging surface for the presence of the wireless power receiving device
Implementation Method 2
The wireless power transmitting device uses measurement circuitry such as coil impedance measurement circuitry or impulse-response circuitry that makes coil inductance measurements
Implementation Method 3
a wireless charging system having a wireless power transmitting device that transmits power wirelessly to a wireless power receiving device
Data Source
AI summary
A wireless power transmission system has a wireless power receiving device that is located on a charging surface of a wireless power transmitting device. The wireless power transmitting device uses measurement circuitry such as coil impedance measurement circuitry or impulse-response circuitry that makes coil inductance measurements to monitor the charging surface for the presence of the wireless power receiving device. In response to detecting that the wireless power receiving device is present on the charging surface, the wireless power transmitting device and the wireless power receiving device establish a wireless communications link. The wireless power transmitting device transmits information on wireless power transmission capabilities of the wireless power transmitting device to the wirelessly power receiving device. The receiving device selects desired settings and transmits these to the transmitting device.