Capacitive Power Transmission Voltage Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing non-contact power transmission systems using electric field coupling face challenges in reducing standby power consumption and ensuring safety, particularly when no power reception device is mounted, due to high electric fields and inefficient voltage monitoring.
Innovation Solution
A power transmission device with a first passive electrode and a first active electrode, capacitively coupled with corresponding electrodes in the power reception device, employs a power supply circuit, detection means, and control means to manage voltage and frequency sweeping to reduce power consumption and ensure safety by maintaining a lower voltage when no device is mounted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage monitoring is performed continuously to ensure safety in electric field coupling power transmission, then safety is improved, but standby power consumption increases
Solution Approach 1:
The patent implements periodic frequency sweeping at different time intervals depending on the operational state. During standby mode, frequency sweeping is performed at longer time intervals to reduce power consumption, while during power transmission, sweeping occurs at shorter intervals to ensure safety and detect foreign objects. This periodic action with variable intervals resolves the contradiction between continuous safety monitoring and reduced standby power consumption.
2Power
If high voltage is maintained at the electrode to form a strong electric field for power transmission, then power transmission efficiency is improved, but safety risks increase due to potential current conduction
Solution Approach 1:
The patent dynamically adjusts the voltage level at the electrode based on the operational state. During standby mode, a lower voltage is maintained to reduce safety risks while still enabling detection. When power transmission is required, the voltage is increased to form a strong electric field for efficient power transfer. This dynamic voltage adjustment resolves the contradiction between power transmission efficiency and safety.
Solution Approach 2:
The patent employs feedback control through continuous frequency sweeping and foreign object detection. The system monitors the electric field conditions and adjusts voltage levels accordingly. When foreign objects or abnormal conditions are detected, the system reduces voltage to prevent current conduction hazards. This feedback mechanism ensures that high voltage is only maintained when necessary for power transmission, resolving the safety efficiency contradiction.
3Measurement precision
If frequency sweeping is performed at short time intervals to detect power reception device, then detection accuracy is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic frequency sweeping with variable time intervals based on operational state. During standby mode, frequency sweeping is performed at longer time intervals to reduce power consumption while maintaining adequate detection capability. When power transmission is active or imminent, sweeping occurs at shorter intervals to improve detection accuracy. This adaptive periodic action resolves the contradiction between detection accuracy and power consumption.
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 reduces standby power consumption and enhances safety by maintaining a lower voltage when no power reception device is mounted, preventing current conduction hazards and optimizing power transmission efficiency.
Implementation Method 1
The first active electrode and a second active electrode of a power reception device are made to face each other with a space therebetween so as to be capacitively coupled with each other
Implementation Method 2
a strong electric field 7 is formed therebetween, whereby high power transmission efficiency is realized
Data Source
AI summary
Power transmission device that causes a power supply circuit to supply a first voltage to a first active electrode when power transmission is performed, causes the power supply circuit to supply a second voltage that is lower than the first voltage to the first active electrode and causes power reception device detection means to perform frequency sweeping at a first time interval until the power reception device is mounted, or causes the power supply circuit to supply a third voltage that is lower than the first voltage to the first active electrode and causes the power reception device detection means to perform frequency sweeping at a second time interval that is longer than the first time interval until the power reception device is removed.