Wireless Power Impedance Matching via Digital-Analog Control
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Solution Overview
Problem
Existing wireless power transmission technologies using electromagnetic induction are limited by the need for precise impedance matching, which is slow and has low positional freedom due to sensitivity to coil matching and limited distance, making rapid and precise impedance adjustment challenging.
Innovation Solution
An apparatus and method that utilize a digital control system to rapidly match impedance, followed by precise analog control, incorporating an oscillator, amplifier, impedance matcher, sensor, digital controller, and analog controller to adjust impedance based on sensed voltage or current values, ensuring efficient wireless power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If impedance matching is performed by detecting a reflection wave, then impedance matching can be achieved, but the response speed is low and the range of matching is small
Solution Approach 1:
The patent changes the control parameter from reflection wave detection to direct impedance parameter detection using a sensor that measures voltage or current. The digital controller adjusts impedance parameters (resistance and reactance) directly based on the detected values, enabling both rapid response and precise matching without the limitations of reflection wave methods
Solution Approach 2:
The patent replaces the traditional reflection wave detection method with a direct electrical measurement system using sensors and digital controllers. This substitution of the control mechanism enables faster response speeds while maintaining or improving impedance matching precision through direct parameter adjustment
2Loss of energy
If electromagnetic induction coupling is used, then transmission efficiency is high, but the power transmission distance is limited and positional freedom is remarkably low
Solution Approach 1:
The patent implements dynamic impedance adjustment capability that allows the system to adapt to changing transmission distances and positions. By rapidly adjusting impedance parameters based on real-time sensor feedback, the system maintains high transmission efficiency across a wider range of distances and positions, thereby increasing positional freedom while preserving energy efficiency
3Length of moving object
If resonant magnetic coupling is used, then energy can be transmitted up to a comparatively long distance, but impedance matching is difficult to perform rapidly and precisely
Solution Approach 1:
The patent implements rapid parameter adjustment capability through digital control that can quickly modify impedance settings in response to changing transmission conditions. This enables the system to maintain resonance and high efficiency even when transmission distance varies, reducing the time required for impedance matching while preserving the extended transmission distance capability of resonant magnetic coupling
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 rapid and accurate impedance matching, enhancing the efficiency and distance of wireless power transmission while improving positional freedom, allowing for reliable power transfer in various applications.
Implementation Method 1
an oscillator which oscillates power having a specific frequency
Implementation Method 2
the technology using the electromagnetic induction phenomenon has been primarily researched in recent years
Implementation Method 3
a transmitting antenna which radiates the magnetic field by using the transmission power
Implementation Method 4
a sensor which senses a voltage value or a current value of the transmission power
Data Source
AI summary
The present invention relates to an apparatus and a method for transmitting wireless power, and more particularly, to an apparatus and a method for transmitting wireless power that rapidly and precisely adjusts impedance so as to transmit desired power. Disclosed an apparatus for transmitting wireless power that performs wireless power transmission, including: an oscillator; an amplifier; an impedance matcher including a matching network which adjusts impedance according to a digital control signal and an analog signal, a sensor, a digital controller which outputs a digital control signal, and generates an analog control start signal when adjustment of the impedance by the digital control signal is completed, and an analog controller which outputs the analog control signal, and a transmitting antenna which radiates the magnetic field by using the transmission power.