Wireless Power Resonator Harmonic Noise Cancellation
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Solution Overview
Problem
Wireless power transmission systems face challenges in canceling harmonic noise, which affects the efficiency and reliability of energy transfer between source and target resonators.
Innovation Solution
The system employs a resonant power generator with differential input signals and notch filters to cancel even-order and odd-order harmonic components, ensuring that the output power transmitted to the target resonator is free from harmonic noise, using a combination of Class-E amplifiers and a low-pass filter to achieve impedance matching and efficient harmonic cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless power transmission is performed using a source resonator and target resonator, then power can be transmitted wirelessly, but harmonic noise is generated that reduces transmission efficiency and reliability
Solution Approach 1:
The patent applies differential signaling to convert the harmful harmonic noise into beneficial cancellation. By transmitting differential signals with opposite phases through the source resonator, the even-order harmonic components generated by non-linear power amplifiers are automatically cancelled at the receiver, transforming the harmful distortion into a self-correcting mechanism that improves transmission reliability without requiring complex external filtering
Solution Approach 2:
The patent introduces notch filters as intermediary components that specifically target and remove odd-order harmonic components from the transmitted signal. These filters act as mediators between the source resonator and target resonator, selectively attenuating harmful frequency components while preserving the fundamental power transmission signal, thereby reducing harmonic noise without affecting the main power transfer
2Object-generated harmful factors
If multiple filters and amplifiers are added to cancel harmonic components, then harmonic noise cancellation improves, but device complexity increases
Solution Approach 1:
The patent merges the harmonic cancellation function directly into the existing power transmission path by using differential signaling in the source resonator configuration. This integration approach combines the power amplification and harmonic cancellation functions into a unified system architecture, eliminating the need for separate cancellation circuits and reducing overall device complexity while maintaining effective noise suppression
Solution Approach 2:
The source resonator is designed to perform multiple functions simultaneously: it acts as both the power transmission medium and the harmonic cancellation mechanism through its differential input configuration. The power amplifiers generate both the fundamental transmission signal and the cancellation signals in one integrated stage, making the system multi-functional and reducing the number of discrete components required
3Object-generated harmful factors
If differential input signals are used to cancel even-order harmonics, then even-order harmonic cancellation is achieved, but impedance matching becomes more difficult
Solution Approach 1:
The patent employs Class-E power amplifiers with specifically optimized operating parameters to generate differential signals that achieve both even-order harmonic cancellation and acceptable impedance matching. By carefully selecting the amplifier operating point, frequency, and loading conditions, the system transforms the impedance matching problem into a parameter optimization task, where adjusted parameters simultaneously achieve harmonic suppression and sufficient power transfer
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 significantly enhances the efficiency and reliability of wireless power transmission by eliminating harmonic noise, ensuring optimal energy transfer and maintaining high efficiency across various harmonic frequencies.
Implementation Method 1
A wireless power refers to energy transmitted to a power receiving unit (PRU) from a power transmitting unit (PTU) via a magnetic resonant coupling
Implementation Method 2
a resonant power generator configured to differentially input a first input signal and a second input signal to the source resonator, and cancel the harmonic component of the output power
Implementation Method 3
The first power amplifier may include a first notch filter; the second power amplifier may include a second notch filter; and the resonant power generator may be further configured to cancel a third harmonic component of the output power using the first notch filter and the second notch filter
Implementation Method 4
The apparatus may further include a low-pass filter (LPF) configured to cancel a fifth or higher odd-order harmonic component of the output power
Data Source
AI summary
A wireless power transmission apparatus includes a source resonator configured to transmit an output power from which a harmonic component has been cancelled to a wireless power reception apparatus by resonating with a target resonator of the wireless power transmission apparatus, and a resonant power generator configured to differentially input a first input signal and a second input signal to the source resonator, and cancel the harmonic component of the output power.