Wireless Power Synchronization Using Rectifier Harmonic Filtering
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Solution Overview
Problem
Existing wireless power transfer (WPT) systems for electric vehicles face challenges in synchronization due to variations in the relative position and resonant frequencies of transmitting and receiving units, leading to increased system cost and complexity, and inefficiencies from using additional hardware or techniques that introduce multiple zero crossings in the rectifier current.
Innovation Solution
Utilizing the first harmonic of the rectifier current as a reference signal for synchronization between the wireless power transmitter and receiver, without requiring additional components, by filtering out higher-order harmonics and adjusting for phase delays to ensure precise alignment and efficient power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional hardware or techniques are used for synchronization, then synchronization precision is improved, but system cost and complexity increase
Solution Approach 1:
The system uses its own rectifier current signal to achieve synchronization, eliminating the need for external shared clocks or additional synchronization hardware. The receiver controller identifies the fundamental harmonic of the rectifier current and uses it as a reference signal, making the system self-sufficient for synchronization purposes.
Solution Approach 2:
The rectifier current signal serves dual purposes: it performs the power conversion function and simultaneously provides the synchronization reference signal. This multi-functionality eliminates the need for separate synchronization hardware, reducing system complexity while maintaining synchronization precision.
2Device complexity
If rectifier current is used as reference signal, then system cost is reduced, but multiple zero crossings occur reducing reliability
Solution Approach 1:
The system extracts only the fundamental harmonic component from the rectifier current signal using filtering techniques. By separating and using only the fundamental frequency component, the system eliminates the multiple zero crossings caused by higher-order harmonics while still using the readily available rectifier current signal.
Solution Approach 2:
The system changes the parameter being used from the raw rectifier current to the filtered fundamental harmonic of the rectifier current. This parameter transformation maintains the cost-effectiveness of using an existing signal while improving reliability by eliminating multiple zero crossings.
3Reliability
If high reactive power is used to avoid multiple zero crossings, then signal stability is improved, but system efficiency decreases
Solution Approach 1:
Instead of adding reactive power to stabilize the signal, the system extracts and uses only the fundamental harmonic component of the existing rectifier current. This approach achieves signal stability without requiring additional reactive power, thereby maintaining system efficiency.
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 enables cost-effective and efficient synchronization by utilizing existing signals within the system, reducing the likelihood of multiple zero crossings and maintaining system efficiency, thus optimizing power transfer in dynamic environments.
Implementation Method 1
Synchronization based on fundamental harmonic resonance
Data Source
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AI summary
Synchronization within a wireless power transmission system is used to ensure proper transfer of power. An example wireless power system includes a wireless power transmitter and a wireless power receiver, wherein the wireless power transmitter comprises a transmitter controller. The wireless power receiver comprises filter circuitry configured to receive an input signal from the wireless power transmitter, identify a harmonic signal of the input signal, and generate a filtered signal. The wireless power receiver also comprises converter circuitry configured to convert the filtered signal to an output signal, and a receiver controller configured to control the converter circuitry, wherein the receiver controller is synchronized with the transmitter controller based on the harmonic signal identified by the filter circuitry.