Wireless Power Transmitter Frequency Splitting Mitigation
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Solution Overview
Problem
Wireless power transmission efficiency decreases significantly when two tightly coupling coils cannot resonate simultaneously, often occurring when a coil in a power receiver is placed too close to a coil in a power transmitter.
Innovation Solution
A wireless power transmitter device with a transmitter circuit, coil, communication unit, and control unit that adjusts the configuration of the coil or transmitting frequency based on received power reports to mitigate frequency splitting phenomena, and a wireless power receiver device with a receiver coil, circuit, and control unit that adjusts the receiver coil configuration to maximize received power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a coil in a power receiver is placed too close to a coil in a power transmitter to improve wireless power transmission efficiency, then the coupling between coils increases, but the two coils cannot stay in resonance simultaneously causing frequency splitting phenomena and significant power loss
Solution Approach 1:
The patent implements dynamic frequency adjustment where the transmitter and receiver coils can independently adjust their operating frequencies based on real-time coupling conditions. When coils are placed close together, the system dynamically shifts frequencies to maintain resonance rather than relying on fixed frequency operation, thereby preventing frequency splitting phenomena while maintaining high transmission efficiency.
Solution Approach 2:
The patent changes the operational parameters (frequencies) of the coils based on the coupling condition. By monitoring the coupling between transmitter and receiver coils, the system adjusts the resonant frequencies of individual coils to maintain optimal resonance even when tightly coupled, thus resolving the contradiction between close placement for efficiency and resonance stability.
2Productivity
If the transmitter and receiver coils are tightly coupled to reduce transmission distance and improve efficiency, then power transfer capability increases, but frequency splitting occurs causing received power to decrease significantly
Solution Approach 1:
The patent employs feedback mechanisms where the receiver coil reports received power information back to the transmitter. Based on this feedback, the transmitter adjusts its operating frequency or coil configuration to optimize power transfer. This closed-loop control prevents frequency splitting by continuously adapting to coupling conditions, thereby maintaining both high power transfer capability and received power levels.
Solution Approach 2:
The patent performs preliminary frequency adjustment or coil configuration optimization before power transmission begins. By pre-adjusting the system parameters based on expected coupling conditions, the system prevents frequency splitting phenomena from occurring during operation, ensuring both high power transfer capability and minimal energy loss.
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 enhances wireless power transmission efficiency by adjusting coil configurations and frequencies to prevent frequency splitting, ensuring optimal power transfer and peak received power levels.
Implementation Method 1
the transmitter coil is configured to receive the transmitting current to generate an electromagnetic field to induce a receiving current in a wireless power receiver device
Implementation Method 2
It becomes popular to adopt resonant coils to improve wireless power transmission efficiency for wireless charging systems
Data Source
AI summary
A wireless power transmitter device that includes a transmitter circuit, a transmitter coil, a transmitter communication unit and a transmitter control unit is provided. The transmitter circuit generates a transmitting current. The transmitter coil receives the transmitting current to generate an electromagnetic field to induce a receiving current in a wireless power receiver device. The transmitter communication unit is configured to receive a report of a received power of the wireless power receiver device therefrom. The transmitter control unit receives the report of the received power and determines whether a frequency splitting phenomena occurs according to the received power. When the frequency splitting phenomena occurs, the transmitter control unit adjusts at least one of a configuration of the transmitter coil and a configuration of the transmitter circuit or adjusts a transmitting frequency of the transmitting current.