Wireless Power Splitter With Quarter-Wave Lines for Impedance Matching
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Solution Overview
Problem
Wireless power transmission systems that split received signals experience signal reflection and attenuation between the splitting point and rectifier, leading to a reduction in conversion efficiency from high-frequency AC power to DC power.
Innovation Solution
A wireless power transmission system with a power reception unit, a splitting unit that splits the received AC power into two transmission lines of equal length, each approximately one-fourth of the wavelength, and rectification units connected to the ends of these lines, maintaining impedance matching to minimize signal loss and reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the received signal is simply split into multiple signals, then the power can be distributed to multiple rectifiers, but signal reflection occurs between the splitting point and rectifier causing attenuation and reduction in conversion efficiency
Solution Approach 1:
The patent changes the physical parameter of transmission line length to one-fourth of the wavelength of the AC power. This specific length parameter creates impedance matching conditions that prevent signal reflection and attenuation, thereby maintaining high conversion efficiency while enabling power distribution to multiple rectifiers.
Solution Approach 2:
The transmission lines with specific lengths act as intermediaries between the splitting unit and rectifiers. These transmission lines are designed with precise length parameters to serve as impedance-matching elements, preventing direct problematic coupling between the splitter and rectifiers while enabling efficient power transfer.
2Adaptability or versatility
If transmission lines are used to connect the splitting unit to rectifiers, then power can be transmitted to multiple rectifiers, but signal attenuation occurs due to reflection between the splitting point and rectifier
Solution Approach 1:
The patent specifies that transmission lines should have a length of one-fourth of the wavelength of the AC power. This parameter optimization ensures impedance matching, minimizing signal reflection and attenuation, thereby maintaining strong signal strength while enabling connections to multiple rectifiers.
3Ease of manufacture
If the transmission line length is not optimized, then the system is easier to manufacture with arbitrary line lengths, but conversion efficiency from high frequency signal to DC signal is reduced
Solution Approach 1:
The patent establishes a specific parameter requirement for transmission line length (one-fourth wavelength) to optimize conversion efficiency. While this reduces manufacturing flexibility, it ensures that the system achieves high efficiency operation. The specific length parameter creates standing wave patterns that provide impedance matching and prevent signal reflection.
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 system effectively suppresses the reduction in conversion efficiency, allowing faster charging of the voltage, with the first embodiment charging to 1 V 5.9% faster than conventional techniques, and subsequent embodiments achieving further improvements in charging speed.
Implementation Method 1
a transmission line length of the second transmission line and a transmission line length of the third transmission line are each substantially equal to one fourth of a wavelength of the AC power
Implementation Method 2
if the received signal is simply split, a signal reflection can occur between a splitting point and a rectifier, which causes an attenuation of the signal
Implementation Method 3
the received high-frequency AC power is rectified to DC power
Data Source
AI summary
A wireless power transmission system includes a transmission line, one end of which is connected to a power reception unit configured to receive AC power, a splitting unit, one end of which is connected to an other end of the transmission line and an other end of which is split into a plurality of transmission lines, a first rectification unit connected to a second transmission line of the splitting unit, and a second rectification unit connected to a third transmission line. A transmission line length of the second transmission line and a transmission line length of the third transmission line are each substantially equal to one fourth of a wavelength of the AC power.