Wireless Power Transmission Impedance Control
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Solution Overview
Problem
In wireless power transmission systems where a single power transmission apparatus sends power to multiple reception apparatuses, differences in power consumption across phases can lead to voltage increases in internal circuits of reception apparatuses, potentially causing failures, especially when apparatuses with low voltage resistance are used.
Innovation Solution
A wireless power transmission apparatus with a first antenna unit for power transmission, a communication unit for authentication using a separate antenna, and a transformation unit that adjusts impedance based on power consumption during authentication and load operation to prevent voltage rises.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single power transmission apparatus transmits electric power to multiple power reception apparatuses simultaneously, then power transmission versatility is improved, but voltage control stability deteriorates due to varying power consumption across phases
Solution Approach 1:
The patent applies dynamics by making the impedance of the resonance circuit adjustable rather than fixed. The control unit dynamically changes the impedance value based on the operational phase (authentication phase vs. power reception phase) and the number of connected reception apparatuses. This dynamic adjustment allows the system to maintain stable voltage control while supporting multiple reception apparatuses across different phases.
Solution Approach 2:
The patent implements parameter changes by modifying the impedance parameter of the resonance circuit according to operational conditions. During the authentication phase, a different impedance value is set compared to the power reception phase. This parameter adaptation enables the transmission apparatus to handle varying power consumption scenarios while maintaining voltage stability.
2Productivity
If impedance is optimized for power reception phase, then power transmission efficiency is improved, but voltage control during authentication phase deteriorates
Solution Approach 1:
The system dynamically adjusts impedance based on the current operational phase. When in the authentication phase, the control unit sets the impedance to a value appropriate for low power consumption scenarios. When transitioning to the power reception phase, the impedance is adjusted to optimize power transmission efficiency. This dynamic phase-based control resolves the contradiction between authentication-phase voltage control and power-reception efficiency.
Solution Approach 2:
The patent applies preliminary action by pre-setting appropriate impedance values for each operational phase before power transmission begins. The control unit determines the operational phase and pre-adjusts the resonance circuit impedance to the optimal value for that phase, ensuring both authentication-phase voltage control and power-reception efficiency are optimized in advance.
3Device complexity
If fixed impedance is used to simplify circuit design, then device complexity is reduced, but power transmission adaptability deteriorates
Solution Approach 1:
The patent implements universality by designing the resonance circuit with adjustable impedance capability that serves multiple functions. The same resonance circuit structure is used across different operational phases (authentication and power reception), but its impedance parameter is adaptively changed to suit each phase's requirements. This multi-functional design achieves both circuit simplicity and transmission adaptability.
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 ensures stable operation across phases of varying power consumption, preventing voltage increases and apparatus failures by dynamically controlling impedance, thus maintaining efficient power reception and transmission.
Implementation Method 1
a first antenna unit (101) configured to perform wireless power transmission with another apparatus
Implementation Method 2
a transformation unit (202) configured to be connected to the first antenna unit (101) and perform impedance transformation
Implementation Method 3
In the magnetic resonance method, electric power is supplied by coupling a resonance circuit included in a power transmission apparatus and a resonance circuit included in a power reception apparatus by resonance of a magnetic field
Data Source
AI summary
A wireless power transmission apparatus includes a first antenna unit configured to perform wireless power transmission with another apparatus, a communication unit configured to include a second antenna unit which is different from the first antenna unit and perform communication for authentication in the wireless power transmission with the other apparatus using electric power received through the first antenna unit, a load configured to operate using the electric power received through the first antenna unit; and a transformation unit configured to be connected to the first antenna unit and perform impedance transformation. The transformation unit performs impedance transformation in accordance with electric power consumed by the communication unit during the communication for authentication performed by the communication unit and performs impedance transformation in accordance with electric power consumed by the load when the authentication is successfully performed.