Adaptive Rectifier Impedance Control Wireless Power
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Solution Overview
Problem
Conventional wireless power transfer systems face inefficiencies due to fixed resonant frequencies and require additional modules for communication and tuning, increasing complexity and cost.
Innovation Solution
An adaptive rectifier with transistor switches is used in the wireless power receiver to create a complex impedance, enabling bidirectional power transfer, reducing system components, and eliminating the need for separate communication modules, while allowing for adaptive tuning and overvoltage protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional diode rectifier is used in wireless power transfer, then the system structure is simple, but the efficiency is reduced due to fixed resonant frequency mismatch
Solution Approach 1:
The patent applies dynamic switching control where the rectifier switches are controlled with adjustable duty cycles and timing to dynamically adapt the input impedance of the rectifier to match the resonant frequency of the L-C tank circuit, thereby maximizing power transfer efficiency while maintaining manageable circuit complexity through controlled dynamic behavior
Solution Approach 2:
The patent changes the operating parameters of the rectifier by adjusting the duty cycle and timing of the switching signals to the rectifier switches, which alters the effective input impedance and allows tuning to match the resonant frequency, thus improving efficiency without requiring additional tuning components
2Loss of energy
If active tuning components are added to match resonant frequency, then efficiency is improved, but device complexity and cost increase
Solution Approach 1:
The patent makes the existing rectifier switches serve dual functions: both rectification of the AC signal and active tuning of the resonant frequency through controlled duty cycle adjustment, eliminating the need for separate tuning components and reducing overall device complexity while improving efficiency
Solution Approach 2:
The rectifier circuit performs self-tuning by using its own switching elements to adjust its input impedance characteristics, eliminating the need for external tuning components and reducing system complexity while achieving optimal resonant frequency matching
3Loss of information
If separate communication modules are included in wireless power transfer system, then communication capability is improved, but system cost and complexity increase
Solution Approach 1:
The patent enables the power transfer system to perform both power transfer and communication functions using the same magnetic coupling channel, where communication is achieved by modulating the load on the secondary side which reflects impedance changes to the primary side, thus eliminating the need for separate communication modules and reducing system complexity
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 adaptive rectifier enhances efficiency, reduces system cost and size, enables bidirectional power transfer, and provides communication capabilities without additional modules, while protecting against overvoltage conditions.
Implementation Method 1
Power is inductively coupled from the power transmitter to the power receiver through the resulting transformer
Implementation Method 2
the L-C resonant frequency is different than a specific desired value
Data Source
AI summary
A wireless power transfer system includes a wireless power receiver having a rectifier. The rectifier includes switches. The wireless power receiver is operable to control the switches for ensuring a complex impedance at the input of the rectifier.