Wireless Power Control Using Current Sensing and Prediction
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Solution Overview
Problem
Conventional wireless power control methods are inadequate for rapidly moving wireless power reception devices, as they have low power control speed and cannot accurately control power transmission due to reliance on feedback signals alone.
Innovation Solution
A wireless power control method and device that dynamically control the output voltage of a power converter based on the intensity of current input, using a feedback circuit with a comparator and RC circuit to maintain uniform current flow, and adjust reference voltages according to changes in charging mode, class, or category of the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional wireless power control methods using feedback signals are used, then power transmission can be controlled, but the power control speed is low and cannot accurately control power for rapidly moving devices
Solution Approach 1:
The system performs preliminary action by predicting the required power level based on the movement trajectory and speed of the wireless power reception device before the actual power adjustment is needed. This allows the wireless power transmission device to proactively adjust its output power, eliminating the delay inherent in conventional feedback-based control methods and achieving both high speed and high precision power control.
2Adaptability or versatility
If feedback signals are used for power control, then power can be dynamically adjusted, but the control is insufficient for abruptly changing power transmission environments
Solution Approach 1:
The system enhances conventional feedback by combining it with prediction algorithms that anticipate future power requirements based on device movement patterns. This dual mechanism allows the system to adapt quickly to changing environments while maintaining reliable and stable power transmission, as the prediction component compensates for the inherent delays in feedback-based control.
3Stability of the object's composition
If the output voltage of the power converter is controlled based on current intensity, then stable power transmission can be achieved, but additional control circuits are required
Solution Approach 1:
The system implements self-service by utilizing the existing current intensity measurements already taken for power management purposes and repurposing them for voltage control decisions. This approach achieves stable power transmission without requiring additional dedicated control circuits, as the system leverages data and existing hardware components to perform multiple functions simultaneously.
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 ensures stable and accurate power transmission to wireless power reception devices, even with abrupt changes in coupling coefficients, by maintaining constant current input to the power converter and adapting to different operational states.
Implementation Method 1
Wireless power transmission or wireless energy transfer is a technology for wirelessly transmitting electric energy from a transmitter to a receiver using the principle of magnetic induction
Implementation Method 2
detecting intensity of current flowing between a power supply unit supplying a fixed voltage and a power converter during power transmission
Data Source
AI summary
A wireless power control method in a wireless power transmission device for wirelessly transmitting power to a wireless power reception device. The method includes receiving a first control signal from the wireless power reception device at a first time interval; sensing a current within the wireless power transmission device to generate a second control signal at a second time interval; and controlling a wireless power based on the first control signal and the second control signal, and in which the first time interval is longer than the second time interval.