Wireless Power Transmission Frequency Control for Efficiency
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Solution Overview
Problem
Conventional wireless energy transfer systems face challenges in maintaining high-efficiency transmission performance, especially when operating under constant voltage conditions, regardless of the amount of power being transmitted.
Innovation Solution
A wireless power transmission system utilizing a pair of antennas with one as a series resonant circuit and the other as a parallel resonant circuit, along with a control section that adjusts the transmission frequency based on the power being transmitted, switching between even and odd modes to optimize efficiency across varying power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional electromagnetic induction technology or resonant magnetic coupling is used for wireless power transmission, then power can be transmitted wirelessly, but transmission efficiency deteriorates when the system performs constant voltage operation across varying power levels
Solution Approach 1:
The patent applies dynamics by making the transmission frequency adjustable rather than fixed. The frequency is dynamically changed based on the power transmission level: using a first frequency for high power transmission and a second frequency for low power transmission. This dynamic adaptation allows the system to maintain high transmission efficiency across varying power levels while performing constant voltage operation.
Solution Approach 2:
The patent changes the transmission frequency parameter according to power levels to optimize efficiency. By switching between different frequency values based on whether power transmission is high or low, the system adapts its operating parameters to maintain optimal transmission efficiency under different conditions while supporting constant voltage operation.
2Loss of energy
If a single transmission frequency is used for wireless power transmission, then the system structure is simple, but transmission efficiency deteriorates when power levels vary between high and low
Solution Approach 1:
The system transitions from a static single-frequency approach to a dynamic multi-frequency approach. A frequency control section is added that automatically selects between a first frequency (for high power) and a second frequency (for low power) based on the current power transmission level. This dynamic frequency selection maintains high efficiency across varying power levels while adding minimal complexity through automated control.
Solution Approach 2:
The transmission frequency parameter is changed based on power levels to optimize efficiency. The system uses a first frequency value for high power transmission and a second frequency value for low power transmission, with the frequency control section automatically selecting the appropriate value. This parameter adaptation maintains high transmission efficiency without requiring complex manual intervention.
3Productivity
If resonant magnetic coupling is used at a fixed frequency f0, then the system operates simply, but it cannot maintain high efficiency across a broad transmission power range
Solution Approach 1:
The patent enhances the fixed-frequency resonant magnetic coupling system by introducing dynamic frequency adjustment. The frequency control section selects between a first frequency and a second frequency based on power transmission levels, enabling the system to maintain high transmission efficiency across a broad power range from high to low power transmission.
Solution Approach 2:
The transmission frequency parameter is adapted based on power levels to expand the efficient operating range. By using a first frequency for high power transmission and a second frequency for low power transmission, the system maintains high efficiency across a broad transmission power range while building upon the resonant magnetic coupling foundation.
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
Enables efficient power transmission with a predetermined output voltage across a broad power range, maintaining high efficiency even when transmitting small or large amounts of power by dynamically controlling the transmission frequency and resonant modes.
Implementation Method 1
a pair of antennas, between which power is transmissible wirelessly by resonant magnetic coupling at a frequency f0
Implementation Method 2
The prior art technique needs further improvement in view of maintaining high-efficiency transmission performance when the system needs to perform a constant voltage operation
Data Source
AI summary
A wireless power transmission system according to the present disclosure includes: a pair of antennas, between which power is transmissible wirelessly by resonant magnetic coupling at a frequency f0, one of which is a series resonant circuit, and the other of which is a parallel resonant circuit; and a control section, which controls a transmission frequency according to the magnitude of the power being transmitted between the antennas. If the power transmitted between the antennas is greater than a reference value P1, the control section sets the transmission frequency to be a value that falls within a first level range that is higher than the frequency f0. But if the power is smaller than the reference value P1, then the control section sets the transmission frequency to be a value that falls within a second level range that is lower than the first level range.