Wireless Power Transmitter Impedance Control for Coupling Variations
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Solution Overview
Problem
Existing wireless power transmission systems face reduced power transmission efficiency due to varying coupling states between the transmitter and receiver, as impedance on the load side is fixed, leading to inefficiencies in power transfer.
Innovation Solution
A method is developed to detect the coupling factor between resonant coils and control the impedance of the load accordingly, ensuring stable power transmission by adjusting the transmission power based on the detected coupling state, thereby improving power transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If impedance of load side is fixed in wireless power transmission system, then device complexity is reduced, but power transmission efficiency deteriorates as coupling state varies
Solution Approach 1:
The patent applies dynamics by transitioning from fixed impedance to dynamically adjustable impedance on the load side. The system continuously monitors coupling state and adjusts impedance in real-time to match optimal values, enabling the system to adapt to varying coupling conditions and maintain high power transmission efficiency throughout the power transfer process.
Solution Approach 2:
The patent implements parameter changes by modifying the impedance parameter of the load side based on detected coupling state. By changing impedance values according to coupling conditions, the system optimizes power transfer efficiency dynamically, resolving the contradiction between device complexity and energy loss.
2Loss of energy
If impedance of load side is adjusted according to coupling state, then power transmission efficiency is improved, but device complexity increases
Solution Approach 1:
The patent employs feedback by implementing a closed-loop control system that detects coupling state and uses this information to adjust impedance on the load side. The feedback mechanism enables automatic optimization of power transmission efficiency without requiring complex manual intervention, balancing the trade-off between efficiency improvement and system complexity.
Solution Approach 2:
The system applies self-service by enabling the wireless power transmission system to automatically monitor its own coupling state and adjust its impedance accordingly. This self-regulating capability allows the system to optimize its own performance without external control, reducing the burden on external control systems while maintaining high efficiency.
3Stability of the object's composition
If coupling factor is detected and transmission power is controlled accordingly, then power transmission stability is improved, but measurement and control complexity increases
Solution Approach 1:
The patent uses feedback by implementing a detection and control loop that monitors coupling factor and adjusts transmission power based on detected values. This feedback mechanism ensures stable power transmission by continuously adapting to coupling variations, while the automated nature of the feedback loop minimizes the complexity burden.
Solution Approach 2:
The system applies preliminary action by detecting coupling state in advance and proactively adjusting transmission power before significant efficiency losses occur. This predictive approach maintains power transmission stability by preparing the system for upcoming coupling variations, reducing the complexity of real-time emergency corrections.
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 approach enhances power transmission efficiency and stability by dynamically adjusting impedance in response to coupling variations, resulting in improved frequency-to-power transmission efficiency characteristics.
Implementation Method 1
a transmission resonant coil unit (22) including a transmission resonant coil (L2), a capacitor (C2) and a resistor (R2), wherein one terminal of the transmission resonant coil (L2) is connected to one terminal of the capacitor (C2) and the other terminal of the transmission resonant coil (L2) is connected to one terminal of the resistor (R2)
Implementation Method 2
a reception resonant coil unit (31) including a reception resonant coil (L3), a capacitor (C3) and a resistor (R3)... a coupling factor between the transmission resonant coil (L2) and the reception resonant coil (L3)
Data Source
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AI summary
Disclosed is a wireless power transmitter which transmits power through a wireless power receiver to a load side. The wireless power transmitter includes a power source for generating AC power; a transmission coil for wirelessly transmitting the AC power to a reception coil of the wireless power receiver; and a detecting unit for detecting a coupling state between the transmission coil and the reception coil.