Wireless Power Transmitter Impedance Control
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Solution Overview
Problem
In wireless power transmission systems, the fixed impedance of the load side and inductance of the receiver coil lead to variations in the coupling state between the transmitter and receiver, resulting in degraded power transmission efficiency.
Innovation Solution
A wireless power transmitter and receiver system that actively controls the impedance of the load side by detecting the coupling state between the coils using input impedance measurements, allowing for adjustment of the output impedance and inductance to optimize power transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed impedance of load side and fixed inductance of receiver coil are used, then device complexity is reduced, but power transmission efficiency is degraded due to coupling state variations
Solution Approach 1:
The patent implements dynamic impedance control by making the load side impedance variable rather than fixed. The controller adjusts the impedance of the load side according to the detected coupling state between transmitter and receiver coils, enabling the system to adapt to varying coupling conditions and maintain high power transmission efficiency across different operating scenarios.
Solution Approach 2:
The patent changes the impedance parameter of the load side dynamically based on the coupling state. By detecting the coupling coefficient or impedance variations and adjusting the load side impedance accordingly, the system optimizes power transfer efficiency. This parameter adjustment can be achieved through variable resistors, capacitors, or active impedance control circuits.
2Device complexity
If fixed inductance of receiver coil is used, then device complexity is reduced, but adaptability to different coupling states is degraded
Solution Approach 1:
The patent makes the receiver coil inductance variable rather than fixed. The controller adjusts the inductance of the receiver coil according to the detected coupling state, enabling the system to adapt to different coupling conditions. This dynamic adjustment maintains resonance conditions and optimizes power transfer efficiency across varying distances and orientations between transmitter and receiver.
Solution Approach 2:
The patent changes the inductance parameter of the receiver coil dynamically based on the coupling state detection. By adjusting the inductance value in response to coupling variations, the system maintains optimal operating conditions. This can be implemented through variable inductors, switched inductor configurations, or active inductance control circuits.
3Loss of energy
If active impedance control is implemented, then power transmission efficiency is improved, but device complexity increases
Solution Approach 1:
The patent implements a feedback control mechanism where the controller detects the coupling state (through impedance measurement or coupling coefficient detection) and uses this information to adjust the load side impedance. This closed-loop feedback system automatically optimizes power transmission efficiency without requiring complex manual intervention, as the system self-regulates based on real-time coupling conditions.
Solution Approach 2:
The patent enables the wireless power transmission system to self-adjust and optimize its own performance. The controller autonomously detects coupling state variations and modifies the load side impedance accordingly, allowing the system to maintain high efficiency without external intervention. This self-service capability reduces the need for complex external control mechanisms.
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 by dynamically adjusting the impedance and inductance based on the detected coupling state, improving the efficiency of power transfer between the transmitter and receiver.
Implementation Method 1
a transmitting coil configured to transmit, which is supplied by a power source, to a receiving coil of the wireless power receiver using resonance
Implementation Method 2
a detecting unit configured to detect a coupling state between the transmitting coil and the receiving coil using an input impedance of the wireless power transmitter
Data Source
AI summary
A wireless power transmitter for transmitting power to a wireless power receiver in a wireless scheme includes a transmitting coil configured to transmit power, which is supplied by a power source, to a receiving coil of the wireless power receiver using resonance; and a detecting unit configured to detect a coupling state between the transmitting coil and the receiving coil using an input impedance of the wireless power transmitter.