Wireless Power Transmitter Coil Current Threshold Adjustment
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Solution Overview
Problem
Current wireless charging systems face inefficiencies and long charging times due to low power transmission capabilities, especially with the increasing size and battery capacity of mobile devices, and lack effective protection against over-voltage damage from strong magnetic fields.
Innovation Solution
A method and apparatus for adjusting the coil current threshold of a power transmitter based on the specifications of the power receiver, using threshold adjustment support information to prevent over-voltage damage, and optimizing power transmission levels through established power transfer contracts, allowing flexible power allocation to multiple receivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power transmitter uses a fixed reference threshold for primary coil current, then the system is simple to operate, but power receivers with different specifications may receive excessive power causing damage
Solution Approach 1:
The patent applies preliminary action by having the power receiver transmit threshold adjustment support information (including inductance value and maximum rectified voltage level) to the power transmitter before power transmission begins. This allows the power transmitter to pre-calculate and set the appropriate reference threshold based on the receiver's specifications, preventing over-voltage damage before it can occur.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the reference threshold parameter based on the power receiver's inductance value and maximum rectified voltage level. The reference threshold is calculated using the formula: reference threshold = (maximum rectified voltage level × inductance value of reference power receiver) / (inductance value of power receiver × maximum rectified voltage level of reference power receiver), allowing the system to adapt to different receiver specifications.
2Productivity
If the power transmitter increases transmission power to reduce charging time, then charging speed improves, but the risk of damaging receivers with lower power tolerance increases
Solution Approach 1:
The patent resolves this contradiction by changing the reference threshold parameter based on the power receiver's specifications. By calculating the appropriate threshold using the receiver's inductance value and maximum rectified voltage level, the system can transmit at the maximum safe power level for each specific receiver, achieving fast charging without exceeding the receiver's power tolerance.
Solution Approach 2:
The system uses feedback from the power receiver's transmitted configuration information (inductance value and maximum rectified voltage level) to adjust the transmission parameters. This feedback mechanism allows the power transmitter to optimize power delivery for each receiver, maximizing charging speed while maintaining safety.
3Adaptability or versatility
If the system uses a standardized power transmission level, then device compatibility is improved, but charging efficiency is reduced for devices with higher battery capacity
Solution Approach 1:
The patent achieves both compatibility and efficiency by dynamically changing the reference threshold parameter based on each power receiver's specifications. The system maintains compatibility by accepting various receiver types while adjusting the transmission parameters to optimize charging efficiency for each device's specific battery capacity and power handling capability.
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 approach enhances charging efficiency and speed by ensuring safe power levels and maximizing charging performance across various devices, while preventing damage from strong magnetic fields and improving compatibility with different receiver specifications.
Implementation Method 1
In the electromagnetic induction method, a power transmission unit generates a magnetic field through a power transmission coil (i.e., a primary coil), and a power reception coil (i.e., a secondary coil) is placed at the location where an electric current may be induced so that power is transferred.
Implementation Method 2
a power reception coil (i.e., a secondary coil) is placed at the location where an electric current may be induced so that power is transferred
Implementation Method 3
In the resonant method, energy is transmitted using a resonant phenomenon between the transmission coil and the reception coil. In this case, a system is configured so that the primary coil and the secondary coil have the same resonant frequency, and resonant mode energy coupling between the transmission and reception coils is used.
Data Source
AI summary
Disclosed is a method for wirelessly transmitting, by a power transmitter including a primary coil, power. The method may include detecting the placement of objects on a surface of an interface included in the power transmitter and selecting a power receiver which belongs to the detected objects and to which power is to be transmitted, performing digital ping for applying a power signal for detecting and identifying the power receiver to the power receiver and receiving a response to the digital ping from the power receiver, obtaining information about the configuration of the power receiver and establishing a power transfer contract with the power receiver using the configuration information, and wirelessly transmitting the power to the power receiver based on the established power transfer contract.