Wireless Power Transmission Full-Duplex Communication
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Solution Overview
Problem
Existing wireless power transmission systems can only perform half-duplex communication, where either the power transmission apparatus or the power reception apparatus can transmit data, but not simultaneously, leading to long wait times for bidirectional data communication.
Innovation Solution
A wireless power transmission system that includes a power transmission apparatus with an inverter circuit and a power transmission control circuit that varies the frequency of alternating current power between two frequencies, and a power reception apparatus with an amplitude modulator that varies the voltage amplitude, allowing both apparatuses to transmit data simultaneously by eliminating amplitude differences between the two frequencies using amplitude control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If frequency modulation is used for data transmission from power transmission apparatus to power reception apparatus, then data communication capability is improved, but amplitude variation causes incorrect demodulation when bidirectional communication is attempted
Solution Approach 1:
The patent introduces an amplitude control circuit as an intermediary component between the frequency modulation stage and the power reception apparatus. This amplitude control circuit actively compensates for amplitude variations caused by frequency changes, thereby preventing incorrect demodulation. The amplitude control circuit serves as a mediator that resolves the conflict between frequency modulation (for data transmission) and amplitude stability (for reliable demodulation).
Solution Approach 2:
The patent dynamically adjusts the amplitude parameter of the alternating current power based on the frequency being used. When the frequency is changed for data transmission, the amplitude control circuit simultaneously modifies the amplitude to maintain consistency. This parameter change approach ensures that frequency modulation can occur without causing amplitude-related demodulation errors, thus resolving the technical contradiction.
2Reliability
If half-duplex communication is used to prevent interference, then demodulation accuracy is maintained, but communication time increases due to waiting periods
Solution Approach 1:
The patent enables continuous bidirectional data communication by allowing both the power transmission apparatus and power reception apparatus to transmit data simultaneously. The amplitude control circuit ensures that frequency modulation on the transmission side does not interfere with amplitude modulation detection on the reception side, thus maintaining continuous useful action without waiting periods typical of half-duplex systems.
Solution Approach 2:
The patent segments the communication channels by separating the modulation dimensions: frequency modulation is used for transmission from the power transmission apparatus to the power reception apparatus, while amplitude modulation is used for transmission from the power reception apparatus to the power transmission apparatus. This segmentation allows both directions to operate simultaneously without interference, converting half-duplex communication into full-duplex communication and reducing communication time.
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 bidirectional data communication without interference, allowing both the power transmission and power reception apparatuses to transmit data simultaneously, reducing the time required for communication and preventing incorrect demodulation of received data.
Implementation Method 1
transmitting first binary communication data from the power transmission antenna to the power reception antenna through electromagnetic coupling between the power transmission antenna and the power reception antenna
Data Source
Figure 1A~1C
Figure 2~3B
Figure 4~5A
AI summary
A power transmission apparatus includes an inverter circuit, a power transmission antenna that wirelessly transmits alternating current power output from the inverter circuit, and a power transmission control circuit that causes the inverter circuit to output the alternating current power. The power transmission control circuit causes the inverter circuit to output the alternating current power as binary communication data by varying frequency of the alternating current power output from the inverter circuit between a first frequency and a second frequency, and performs amplitude control for eliminating a difference between amplitude of voltage of the alternating current power at a time when the frequency is the first frequency and amplitude of the voltage of the alternating current power at a time when the frequency is the second frequency.