Wireless Power Transmitter Dynamic Control for Error Prevention
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Solution Overview
Problem
Wireless charging systems face issues with abnormal situations such as over-voltage, over-current, and over-temperature errors, which can lead to system failures and unfavorable user experiences, particularly when multiple wireless power receivers with different characteristics are charged simultaneously.
Innovation Solution
A control method for a wireless power transmitter that adjusts power transmission to a lower percentage of the maximum received power level to prevent system errors, using a power adjust command to reduce power consumption in affected wireless power receivers, thereby preventing extreme conditions and maintaining system stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wireless power transmitter charges multiple wireless power receivers with different characteristics simultaneously, then charging efficiency and user convenience are improved, but system errors such as over-voltage, over-current, and over-temperature occur more frequently
Solution Approach 1:
The patent implements dynamic power adjustment by continuously monitoring charging status and transmitting power adjust commands to receivers that approach error thresholds. The transmitter dynamically changes power transmission levels based on real-time feedback from multiple receivers, transitioning from static to dynamic control to prevent system errors while maintaining efficient charging of multiple devices
Solution Approach 2:
The system establishes a feedback mechanism where wireless power receivers monitor their charging parameters (voltage, current, temperature) and communicate status information back to the transmitter. The transmitter uses this feedback to identify receivers approaching error thresholds and sends power adjust commands accordingly, creating a closed-loop control system that prevents errors while maintaining productivity
2Speed
If power transmission level is increased to charge wireless power receivers faster, then charging speed is improved, but the risk of abnormal situations such as over-voltage, over-current, and over-temperature increases
Solution Approach 1:
The system performs preliminary monitoring of receiver status parameters before abnormal situations occur. By continuously checking voltage, current, and temperature levels and comparing them against threshold values, the transmitter can take preventive action by sending power adjust commands before over-voltage, over-current, or over-temperature errors occur, thus maintaining high charging speeds while preventing harmful conditions
Solution Approach 2:
The patent applies preliminary anti-action by detecting when receivers approach error thresholds and preemptively reducing power transmission to those specific receivers. This counter-action prevents the harmful effects of abnormal situations from occurring in the first place, allowing the system to maintain high overall charging speed while protecting individual receivers from damage
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
The solution effectively prevents abnormal situations from escalating into system errors, ensuring reliable and efficient charging of multiple wireless power receivers by dynamically adjusting power levels based on detected errors, thereby enhancing user experience and system reliability.
Implementation Method 1
Electromagnetic induction-based power transmission refers to power transfer between primary and secondary coils. When a magnet moves through a coil, current is induced.
Implementation Method 2
A resonance-based wireless charging system has achieved wireless energy transfer from a charger at a distance of a few meters based on the resonance-based power transmission principle by the Coupled Mode Theory.
Data Source
AI summary
Disclosed is a control method of a wireless power transmitter, including transmitting power to a plurality of wireless power receivers based on a first power value required by a first wireless power receiver from among the plurality of wireless power receivers, and before reaching a threshold condition in which a system error occurs in the wireless power transmitter, transmitting a power adjust command to reduce the power to a lower percentage of a maximum received power level, to at least one wireless power receiver from among the plurality of wireless power receivers, wherein the power adjust command is a control command for reducing power consumption of the at least one wireless power receiver from among the plurality of wireless power receivers, and wherein the system error comprises at least one of an over-temperature error, an over-current error, and an over-voltage error.