ASK Demodulation Circuit for Low-Cost Wireless Power Data Links
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Solution Overview
Problem
Existing wireless power transfer systems face inefficiencies and increased costs due to the need for additional antennas and circuitry for data communication, which can lead to interference, harmonic distortion, and increased Bill of Materials (BOM), complicating device design and increasing costs.
Innovation Solution
A low-cost demodulation circuit that decodes amplitude shift keying (ASK) signals by detecting changes in electrical characteristics, reducing computational resources required for data decoding and allowing the use of less capable processors, thereby simplifying the system and reducing BOM.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional antennas and circuitry are used for data communication in wireless power transfer systems, then communication capability is improved, but device complexity and Bill of Materials increase
Solution Approach 1:
The patent combines wireless power transfer and data communication functions into a single antenna and circuit system. The same antenna used for power transfer also receives modulated power signals containing data, eliminating the need for separate communication antennas and circuitry. This merging approach maintains full communication capability while significantly reducing device complexity and component count.
Solution Approach 2:
The patent implements multi-functionality by enabling the power transfer antenna and associated circuits to perform both power reception and data communication functions. The receiver system modulates data onto the power signal, allowing the existing power transfer infrastructure to serve dual purposes, thereby improving system versatility without adding dedicated communication hardware.
2Adaptability or versatility
If additional antennas and circuitry are used for data communication, then communication capability is improved, but Bill of Materials and cost increase
Solution Approach 1:
The patent merges power transfer and communication functions into a single hardware platform, eliminating redundant components. By using the same antenna and signal processing circuits for both power reception and data communication, the system reduces the quantity of components required, directly lowering the Bill of Materials and overall system cost while maintaining communication capability.
Solution Approach 2:
The receiver system is designed to extract both power and data from the received signal through a single antenna interface. The modulation detection circuitry operates on the same signal path as the power rectification, allowing one set of components to fulfill multiple functions and reduce component quantity.
3Adaptability or versatility
If additional antennas are used for out of band communications, then communication capability is improved, but interference and cross-talk increase
Solution Approach 1:
The patent combines power transfer and communication into the same frequency band and physical antenna, eliminating the presence of multiple antennas that could cause cross-talk. Since there is only one antenna system, antenna-to-antenna interference is completely eliminated, while communication is achieved through modulation of the power signal itself.
Solution Approach 2:
The patent converts the power signal, which could be considered a harmful interference to communication bands, into a carrier for data transmission. By modulating data onto the power signal, the system turns what would be interference into the communication medium itself, eliminating the need for separate communication antennas that would create cross-talk.
4Adaptability or versatility
If additional circuitry is used for data communication, then communication capability is improved, but computational resources required for decoding increase
Solution Approach 1:
The patent introduces a dedicated modulation detection circuit as an intermediary between the received signal and the microcontroller. This specialized hardware circuit performs the complex task of detecting modulation envelope changes and extracting data bits, offloading this computationally intensive function from the microcontroller and reducing its processing burden while maintaining full communication capability.
Solution Approach 2:
The patent replaces software-based signal processing and decoding algorithms with dedicated hardware circuitry. The modulation detection circuit uses analog and digital signal processing components to detect envelope transitions and decode data bits directly in hardware, substituting computational operations with electrical circuit operations that are more efficient for this specific task.
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 demodulation circuit enables efficient and accurate in-band communication with reduced computational burden, lowering system costs and complexity while minimizing interference, thus enhancing the overall efficiency of wireless power transfer systems.
Implementation Method 1
a transmitter antenna configured to couple with at least one other antenna of at least one other system and transmit alternating current (AC) wireless signals to the at least one antenna
Implementation Method 2
The demodulation circuit is configured to (i) receive the electrical information from the at least one sensor, (ii) detect a change in the electrical information, (iii) determine if the change in the electrical information meets or exceeds one of a rise threshold or a fall threshold
Data Source
AI summary
A wireless transmission system includes a transmitter antenna, a sensor, a demodulation circuit, and a transmitter controller. The sensor is configured to detect electrical information associated with AC wireless signals, the electrical information including, at least, a voltage of the AC wireless signals. The demodulation circuit is configured to receive the electrical information from the at least one sensor, detect a change in the electrical information, determine if the change in the electrical information meets or exceeds one of a rise threshold or a fall threshold, if the change exceeds one of the rise threshold or the fall threshold, generate an alert, and output a plurality of data alerts. The transmitter controller is configured to receive the plurality of data alerts from the demodulation circuit, and decode the plurality of data alerts into the wireless data signals.