Wireless Power Transmitter Damping Circuit for ASK Signal Fidelity
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Solution Overview
Problem
Current high frequency wireless power transfer systems face challenges in maintaining data communication fidelity at higher power levels, as additional antennas and circuitry increase costs, cause interference, and degrade wireless communications, while legacy hardware is inadequate for high power handling.
Innovation Solution
Incorporating a damping circuit with a damping transistor, resistor, and capacitor to reduce rise and fall times during amplitude shift keying (ASK) signal transmission, allowing for higher power transfer without degrading data communication standards, by dissipating minimal power and preventing power efficiency loss.
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 data communication capability is improved, but device complexity and cost 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 serves as the communication antenna, and the damping circuit serves dual purposes of power management and signal modulation, eliminating the need for separate communication antennas and reducing overall device complexity
Solution Approach 2:
The damping circuit is designed to perform multiple functions: it manages power transfer efficiency while simultaneously enabling amplitude shift keying (ASK) modulation for data communication. The single antenna system handles both power and data transmission, making the system more versatile without requiring additional dedicated components
2Adaptability or versatility
If additional antennas and circuitry are used for data communication, then data communication capability is improved, but interference and EMI worsen
Solution Approach 1:
By merging power transfer and data communication into a single channel using the same antenna, the patent eliminates out-of-band interference and cross-talk between separate antennas. The unified approach ensures that power and data signals operate in the same frequency band, preventing the harmful interference that would occur between separate communication and power antennas
Solution Approach 2:
The patent converts the potential harm of using the same antenna for both power and data into a benefit by implementing ASK modulation. The amplitude variations needed for data modulation are achieved by controlled damping of the power signal, turning what could be signal degradation into a useful modulation mechanism for reliable data communication
3Adaptability or versatility
If legacy hardware is used for high frequency wireless power transfer, then power transfer capability is maintained, but power level handling capability deteriorates
Solution Approach 1:
The patent modifies the operating parameters of legacy hardware by introducing controlled damping to the resonant frequency system. The damping circuit allows the system to operate at higher power levels by managing the energy dissipation and preventing overload conditions, effectively extending the power handling capability beyond what legacy undamped systems could sustain
4Reliability
If damping circuit is used to reduce rise and fall times during ASK transmission, then data communication fidelity is improved, but power loss increases
Solution Approach 1:
The damping circuit is designed to provide just enough damping to achieve the required rise and fall times for reliable ASK modulation, without excessive damping that would cause significant power loss. The damping factor is optimized to be sufficient for signal integrity but minimal enough to maintain high power transfer efficiency
Solution Approach 2:
The damping circuit dynamically adjusts its damping factor based on the operational state, providing stronger damping during signal transitions to ensure fidelity, and weaker damping during steady-state power transfer to minimize power loss. This adaptive parameter adjustment resolves the contradiction between signal quality and power efficiency
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 faster data rates and enhanced data ranges with improved signal fidelity, maintaining data communication integrity at higher power levels, and reducing power loss, thus overcoming the limitations of legacy systems.
Implementation Method 1
a damping circuit that is configured to dampen the AC wireless signal during transmission of the ASK wireless data signals
Implementation Method 2
The amplifier includes at least one transistor that is configured to receive the driving signal at a gate of the at least one transistor and invert a direct power (DC) input power signal to generate the AC wireless signal
Data Source
AI summary
Wireless power transfer systems, disclosed, include one or more circuits to facilitate high power transfer at high frequencies. Such wireless power transfer systems include a damping circuit, configured to dampen a wireless power signal such that communications fidelity is upheld at high power. The damping circuit includes at least a damping transistor that is configured to receive, from the transmitter controller, a damping signal for switching the transistor to control damping during transmission of amplitude shift keying (ASK) wireless data signals. Utilizing such systems enables wireless power transfer at high frequency, such as 13.56 MHz, at voltages over 1 Watt, while maintaining fidelity of in-band communications associated with the higher power wireless power signal.