Wireless Power Transmitter Frequency Adaptation
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Solution Overview
Problem
Conventional wireless power transmitting terminals have limited adaptability and can cause damage to devices due to over-voltage issues when the device is close to the charging coil, and inefficiency when the device is at a distance beyond the preset optimal range.
Innovation Solution
A wireless power transmitting terminal with an inverter circuit, resonance circuit, and controller that dynamically adjusts its operating state by switching between candidate frequencies to determine a resonance frequency and maximum peak value, allowing real-time adaptation to the device's position and distance, thereby optimizing charging efficiency and preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the preset distance range is increased to satisfy long distance charging requirements, then the adaptability to different devices is improved, but the induced voltage becomes too high when the device is close to the transmitting terminal, triggering over-voltage protection and preventing continuous charging or causing damage
Solution Approach 1:
The patent applies dynamics by making the initial magnetic field intensity adjustable rather than fixed. The controller dynamically adjusts the initial magnetic field intensity based on the detected distance between the transmitting terminal and the charging device, selecting from multiple preset intensity levels. This resolves the contradiction by allowing the system to adapt to both long-distance and close-distance charging scenarios, preventing over-voltage damage while maintaining charging effectiveness across different distances.
Solution Approach 2:
The patent implements parameter changes by modifying the initial magnetic field intensity parameter according to the detected distance. The system detects the distance and accordingly changes the initial magnetic field intensity parameter to an appropriate preset value, enabling the same transmitting terminal to safely charge devices at varying distances without triggering over-voltage protection.
2Object-affected harmful factors
If the preset distance range is decreased to limit the charging zone, then the induced voltage is controlled within safe limits, but the charging terminal can only serve a limited number of device types and distances
Solution Approach 1:
The system uses dynamic adjustment of the initial magnetic field intensity based on real-time distance detection. Instead of being constrained to a fixed distance range, the transmitting terminal can adapt its operating parameters to serve devices at various distances, thereby maintaining safe voltage levels while expanding device compatibility.
Solution Approach 2:
The patent achieves universality by enabling the transmitting terminal to handle multiple charging scenarios (different distances, different device types) through a single adjustable system. By providing multiple preset initial magnetic field intensities and selecting appropriate ones based on distance, the terminal becomes universally applicable to various charging needs without requiring multiple dedicated devices.
3Ease of operation
If a fixed initial magnetic field intensity is used, then the system is simple to operate, but it cannot adapt to devices at different distances or positions
Solution Approach 1:
The system implements self-service by automatically detecting the distance between the transmitting terminal and the charging device, then autonomously selecting the appropriate initial magnetic field intensity from preset values. This eliminates the need for manual configuration while achieving adaptive charging, thus maintaining ease of operation without sacrificing adaptability.
Solution Approach 2:
The patent applies feedback by using the detected distance information to adjust the initial magnetic field intensity. The system continuously monitors the charging state and distance, and accordingly adjusts the magnetic field parameters to optimize charging performance, creating a closed-loop control system that is both simple to operate and highly adaptive.
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 solution enhances the adaptability and safety of wireless charging by dynamically adjusting the magnetic field intensity based on the device's distance, ensuring efficient charging and preventing over-voltage damage.
Implementation Method 1
the resonance circuit is connected to the inverter circuit, receiving the alternating current outputted by the inverter circuit to generate an alternating magnetic field
Implementation Method 2
in a frequency detection state, controlling the alternating current of the inverter circuit to switch between different candidate frequencies to determine a resonance frequency, wherein at the resonance frequency, an electrical parameter of the alternating current has a maximum peak value
Data Source
AI summary
A wireless power transmitting terminal and control method are disclosed. The wireless power transmitting terminal including an inverter circuit, a resonance circuit and a controller, wherein in a frequency detection state, an alternating current of the inverter circuit is controlled to switch between different candidate frequencies, so as to determine a resonance frequency and a maximum peak value of an electrical parameter of the alternating current at the resonance frequency, and determine an operating state of the power transmitting terminal according to the change of the maximum peak value. Therefore, the wireless power transmitting terminal can dynamically adjust in real time a preset operating state thereof, thereby improving the device adaptability, and avoiding the damage of the device to be charged.