Wireless Power Transmission Frequency Control for Multi-Device Voltage Stability
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Solution Overview
Problem
Existing wireless power transfer systems fail to adequately supply power simultaneously to multiple devices in a non-contact manner due to differences in load characteristics and required voltage levels among the devices, leading to unstable charging operations and potential damage from excessive or insufficient voltage.
Innovation Solution
A wireless power transmission apparatus with a power transmission antenna, receiver circuits, and a control circuit that adjusts the frequency of high-frequency power transmission to minimize the error between required and received voltages across multiple wireless power reception apparatuses, ensuring each device receives power within its target voltage range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a wireless power transmission apparatus transmits high-frequency power to multiple wireless power reception apparatuses simultaneously, then power supply capability to multiple devices is improved, but voltage control accuracy deteriorates due to differences in load characteristics and required voltage levels
Solution Approach 1:
The patent segments the power transmission by dividing multiple reception apparatuses into separate groups or pairs, and transmits power to each group at different frequencies. This segmentation allows independent voltage control for each frequency channel, resolving the voltage control accuracy issue while maintaining the ability to supply power to multiple devices simultaneously.
Solution Approach 2:
The patent dynamically adjusts transmission parameters by using different frequencies for different reception apparatuses. The system can adaptively change frequency allocation based on load characteristics and voltage requirements of each device, enabling precise voltage control while maintaining high productivity.
2Measurement precision
If frequency is adjusted to match each reception apparatus requirements, then voltage control accuracy is improved, but system complexity increases due to need for frequency management across multiple devices
Solution Approach 1:
The patent uses a single power transmission antenna that can operate at multiple frequencies, making it universal for serving different reception apparatuses with diverse voltage requirements. This multi-functional capability allows the system to achieve precise voltage control without requiring separate transmission antennas for each device, thereby limiting the increase in system complexity.
3Device complexity
If high-frequency power is transmitted to multiple devices at the same frequency, then system simplicity is maintained, but voltage errors occur due to conflicting load characteristics
Solution Approach 1:
The patent introduces dynamic frequency allocation where the system can switch between different frequencies based on the specific reception apparatus being served. This dynamic approach maintains system simplicity by using a single antenna while ensuring charging stability through frequency adaptation to match load characteristics of each device.
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 simultaneous, stable, and safe power supply to multiple wireless power reception apparatuses by minimizing voltage errors, thus ensuring efficient and reliable charging operations without damaging circuit elements.
Implementation Method 1
The wireless power transfer system transmits power in a non-contact manner from a wireless power transmission apparatus to a wireless power reception apparatus through electromagnetic induction between a power transmission coil of the wireless power transmission apparatus and a power reception coil of the wireless power reception apparatus
Implementation Method 2
a wireless power transfer system using a power transmission coil and a power reception coil of resonance type (coupling of a resonant magnetic field) is capable of maintaining high transfer efficiency even when the position of the power transmission coil is misaligned with that of the power reception coil
Data Source
AI summary
A wireless power transmission apparatus according to the present disclosure includes a power transmission antenna, receiver circuits, and a control circuit. The power transmission antenna transmits high-frequency power at each of frequencies to wireless power reception apparatuses. Each of the receiver circuits obtains, from a corresponding one of the wireless power reception apparatuses, the value of a required voltage of the wireless power reception apparatus and the value of a power reception voltage received by the wireless power reception apparatus from the wireless power transmission apparatus. The control circuit obtains the required voltage value and the power reception voltage value from each of the receiver circuits, and controls the frequency of the high-frequency power. The control circuit changes the frequency of the high-frequency power so that the sum total of errors between the required voltage and the power reception voltage is minimized.