Wireless Power Transmission Filter Harmonic Reflection
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Solution Overview
Problem
Conventional wireless power transmission technologies face inefficiencies in rectification due to higher harmonics generated during switching operations, leading to increased power consumption and heat radiation issues.
Innovation Solution
Incorporating a filter between the power receiving antenna and the power receiver, which reflects higher harmonics with an arbitrary impedance, specifically designed to maximize rectification efficiency by adjusting the output impedance of the third harmonic within a targeted phase range, thereby reducing rectification loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a power receiver performs rectification and smoothing without a filter, then the device complexity is reduced, but the rectification efficiency deteriorates due to higher harmonics generated during switching operations
Solution Approach 1:
A filter is introduced as an intermediary component between the power receiving antenna and the power receiver. This filter acts as a mediator that selectively removes higher harmonics generated during rectification while allowing the fundamental power transmission frequency to pass through, thereby improving rectification efficiency without significantly increasing overall system complexity
Solution Approach 2:
The filter is designed with specific impedance characteristics that change based on frequency. It presents low impedance to the fundamental power transmission frequency to allow efficient power transfer, while presenting high impedance to higher harmonics to reflect them back, thereby optimizing rectification efficiency through parameter-based frequency discrimination
2Device complexity
If the power receiver operates without filtering higher harmonics, then the device complexity is reduced, but power consumption increases due to rectification loss
Solution Approach 1:
The filter serves as an intermediary that prevents higher harmonics from entering the power receiver, thereby reducing the energy loss associated with rectifying these unwanted frequency components. This mediation reduces overall power consumption while maintaining acceptable device complexity
Solution Approach 2:
The filter converts the harmful effect of higher harmonics (which cause rectification loss and increased power consumption) into a beneficial outcome by reflecting these harmonics back. The harmonics that would otherwise be lost as waste energy are instead redirected, improving overall energy efficiency
3Device complexity
If higher harmonics are not reflected, then the device complexity is reduced, but heat radiation capability deteriorates due to increased power consumption
Solution Approach 1:
The filter acts as a protective intermediary between the power receiving antenna and the power receiver, blocking higher harmonics before they can contribute to excessive heat generation in the power receiver. This mediation improves heat radiation capability by reducing the thermal load
Solution Approach 2:
The filter transforms the potentially harmful higher harmonics (which would increase power consumption and heat generation) into a beneficial configuration where these harmonics are reflected back. This conversion reduces the thermal burden on the power receiver, improving heat radiation capability while maintaining simple device architecture
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 configuration enhances transmission efficiency by minimizing rectification loss and improving heat radiation capabilities, achieving highly efficient non-contact power feeding.
Implementation Method 1
a first resonance capacitor connected between the power transmitter and the power transmitting antenna, and resonating with the power transmitting antenna so as to pass the power transmission frequency of the power transmitter
Implementation Method 2
a second resonance capacitor connected between the power receiving antenna and the power receiver, and resonating with the power receiving antenna so as to pass the power transmission frequency of the power transmitter
Implementation Method 3
a filter connected between the second resonance capacitor and the power receiver, the filter reflecting higher harmonics generated by the power receiver
Implementation Method 4
performing non-contact transmission of power by electromagnetic induction
Data Source
AI summary
A wireless power transmission apparatus is provided for performing non-contact transmission of power by electromagnetic induction, and includes a power transmitter performing frequency conversion; a power transmitting antenna connected to the power transmitter; and a first resonance capacitor connected between the power transmitter and the power transmitting antenna, and resonating with the power transmitting antenna to pass the power transmission frequency of the power transmitter. The wireless power transmission apparatus includes a power receiving antenna arranged to oppose the power transmitting antenna; a power receiver connected to the power receiving antenna, and performing rectification and smoothing; and a second resonance capacitor connected between the power receiving antenna and the power receiver, and resonating with the power receiving antenna to pass the power transmission frequency of the power transmitter. The wireless power transmission apparatus includes a filter connected between the second resonance capacitor and the power receiver, and reflecting higher harmonics generated by the power receiver.