ASK Demodulation Circuit With Adaptive Gain for Wireless Power
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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 and harmonic distortion, especially when the relative positions of the sender and receiver vary.
Innovation Solution
A demodulation circuit with a slope detector and comparator circuit is used to decode amplitude shift keying (ASK) signals, reducing computational resources and Bill of Materials (BOM) by allowing cheaper processors and dynamically adjusting thresholds based on voltage rate of change, enabling efficient in-band data transfer regardless of sender and receiver positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional antennas and circuitry are used for data communication, then data transfer capability is improved, but device complexity and BOM cost increase
Solution Approach 1:
The patent combines data communication and power transfer functions into a single antenna system. The transmitter antenna transmits both power signals and modulated data signals simultaneously, eliminating the need for separate data communication antennas and circuitry. This merging approach reduces device complexity and BOM cost while maintaining data transfer capability.
Solution Approach 2:
The single antenna system is designed to perform multiple functions: transmitting power, transmitting data through in-band modulation, and receiving feedback signals. This multi-functional design replaces what would traditionally require separate dedicated antennas for each function, thereby reducing overall system complexity.
2Adaptability or versatility
If additional antennas and circuitry are used for data communication, then data transfer capability is improved, but BOM cost increases
Solution Approach 1:
By merging data communication and power transfer into a single antenna system, the patent reduces the number of components that need to be sourced, assembled, and tested. This consolidation directly reduces BOM cost by eliminating redundant antennas, RF circuitry, and associated components while maintaining full data transfer functionality.
3Adaptability or versatility
If additional antennas are used for out of band communications, then data transfer is enabled, but interference and cross-talk increase
Solution Approach 1:
The patent merges data and power signals into the same frequency band, eliminating the presence of multiple antennas that would operate at different frequencies. This single-band approach removes the source of cross-talk and interference between antennas while enabling data transfer through signal modulation.
4Adaptability or versatility
If additional antennas and circuitry are used, then data communication is enabled, but EMI and harmonic distortion worsen
Solution Approach 1:
By combining data modulation with the power transfer signal in a single antenna system, the patent eliminates the additional electronic circuitry that would generate harmonics and EMI. The single antenna approach reduces the number of signal paths and active components, thereby reducing the overall EMI and harmonic distortion in the system.
5Ease of manufacture
If in-band data transfer is used, then BOM cost is reduced, but effectiveness decreases when relative positions vary
Solution Approach 1:
The patent employs dynamic signal processing and adaptive modulation techniques that adjust to changing coupling conditions between transmitter and receiver. This dynamic adaptation maintains data transfer effectiveness despite variations in relative positions, overcoming the limitation of fixed in-band transfer systems.
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 solution significantly reduces computational resources and BOM, enhances data transfer accuracy, and adapts to varying coupling conditions, ensuring reliable data communication across different positions and orientations of the sender and receiver.
Implementation Method 1
inductive and/or resonant inductive wireless power transfer, which occurs when magnetic fields created by a transmitting element induce an electric field and, hence, an electric current, in a receiving element
Implementation Method 2
A demodulation circuit with a slope detector and comparator circuit is used to decode amplitude shift keying (ASK) signals
Data Source
AI summary
A demodulation circuit includes a slope detector circuit and a comparator circuit. The slope detector circuit is configured detect a change in the voltage and determine if the voltage rate of change meets or exceeds one of a rise threshold or a fall threshold. The comparator circuit is configured to set an upper limit and lower limit for rate of change, compare the voltage rate of change to the limits, determine that the voltage rate of change meets or exceeds the limits, if the voltage rate of change meets or exceeds the rising and falling rate of change limits, (v) set a lower limit for a falling rate of change, (vi) receive the voltage rate of change and determine that the voltage rate of change meets or exceeds the fall or rise threshold, if the voltage rate of change meets or exceeds the falling or rising rate of change.