Wireless Power Transmission Apparatus with Reflected Power Detection
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Solution Overview
Problem
Existing wireless power transmission systems face inefficiencies due to variations in the number of objects receiving power, as they require accurate detection and matching circuit control, which is challenging without optical detection devices and can lead to false detection and mismatched impedance.
Innovation Solution
A wireless power transmission apparatus with a high-frequency power generator, power-transmitting and receiving electrodes, a switchable matching device, a detection circuit, and a controller that automatically adjusts matching circuits based on reflected power output to match impedance with the number of receiving electrodes, eliminating the need for optical detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical detection devices are arranged to detect the number of objects receiving power, then the number of power-receiving electrodes can be detected, but false detection occurs when devices without power-receiving electrodes enter the power-receiving region
Solution Approach 1:
The patent replaces optical detection devices with an electrical detection method. The detection circuit measures reflected power from the power-transmitting electrode to determine the number of power-receiving electrodes actually receiving power. This electrical field-based detection method is more reliable than optical detection because it directly detects the electrical coupling status between transmitting and receiving electrodes, eliminating false detections caused by objects without power-receiving electrodes entering the region.
Solution Approach 2:
The power-transmitting electrode itself serves as the detection sensor by measuring its own reflected power. The system uses the electrical characteristics of the power transmission process to detect the number of receiving electrodes, eliminating the need for separate detection devices. The reflected power naturally indicates the coupling status and number of active receiving electrodes.
2Loss of energy
If matching circuit control is adjusted according to the number of power-receiving electrodes, then power transmission efficiency is maximized, but system complexity increases due to the need for detection and control mechanisms
Solution Approach 1:
The patent implements a feedback control system where the detection circuit continuously monitors reflected power from the power-transmitting electrode and provides this information to the controller. The controller automatically adjusts the matching circuit based on the detected number of power-receiving electrodes to maintain optimal power transmission efficiency. This closed-loop feedback mechanism enables automatic adaptation without requiring complex manual intervention.
Solution Approach 2:
The detection circuit serves multiple functions: it detects the number of power-receiving electrodes, determines their operational status, and provides feedback for matching circuit control. The power-transmitting electrode serves both as a power transmission element and as a sensing element for detecting reflected power. This multi-functionality reduces the need for separate dedicated components, thereby reducing overall system complexity.
3Adaptability or versatility
If the number of power-receiving electrodes varies, then adaptability to different scenarios is improved, but matching between power transmission and reception deteriorates
Solution Approach 1:
The patent implements dynamic adjustment of the matching circuit based on the real-time number of power-receiving electrodes detected through reflected power measurement. The system transitions from a static matching configuration to a dynamic one that automatically adapts to varying numbers of receiving electrodes. The controller adjusts matching components such as variable capacitors or inductors to maintain optimal impedance matching regardless of how many objects are simultaneously receiving power.
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 configuration enables automatic matching between power generation and transmission, improving efficiency and avoiding false detection, thus ensuring safe and high-efficiency wireless power transfer even with varying numbers of receiving objects.
Implementation Method 1
Each of the power-receiving electrodes is capable of being opposed to the power-transmitting electrode and wirelessly receiving the high-frequency power from the power-transmitting electrode via electric field coupling using capacitance between the power-transmitting electrode and the power-receiving electrode
Implementation Method 2
via electric field coupling using capacitance between the power-transmitting electrode and the power-receiving electrode
Implementation Method 3
The detection circuit is electrically connected between the high-frequency power generator and the switchable matching device to detect, based on output of reflected power from the power-transmitting electrode, whether or not the generation of the high-frequency power by the high-frequency power generator and the transmission of the high-frequency power at the power-transmitting electrode match each other
Data Source
AI summary
A wireless power transmission apparatus includes a high-frequency power generator, a power-transmitting electrode, a plurality of power-receiving electrodes, a switchable matching device, a detection circuit and a controller. The high-frequency power generator generates high-frequency power. The power-transmitting electrode is configured to transmit the high-frequency power generated by the high-frequency power generator. Each of the power-receiving electrodes is capable of wirelessly receiving the high-frequency power from the power-transmitting electrode. The matching device is electrically connected with the power-transmitting electrode and includes one or more matching circuits. The detection circuit detects, based on the output of reflected power from the power-transmitting electrode, whether or not the generation of the high-frequency power by the high-frequency power generator and the transmission of the high-frequency power at the power-transmitting electrode match each other. The controller switches the one or more matching circuits of the matching device depending on the detection result of the detection circuit.