ASK Damping Circuit for High-Power Wireless Power Transmission
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Solution Overview
Problem
Existing high frequency wireless power transfer systems face challenges in achieving higher power transfer levels without degrading communication fidelity, particularly at power levels above 300 mW, where legacy hardware may be damaged and data communications are compromised.
Innovation Solution
The implementation of a damping circuit in wireless transmission systems, which includes a damping transistor, resistor, capacitor, and diode, is configured to reduce rise and fall times during amplitude shift keying (ASK) signal transmission, ensuring compliance and enhancing data rates and ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If wireless power transfer power level is increased above 300 mW, then power transfer capability is improved, but communication fidelity deteriorates and legacy hardware may be damaged
Solution Approach 1:
The damping circuit dynamically adjusts the rise and fall times of the power signal to accommodate ASK communication. By making the signal transitions adjustable rather than fixed, the system can maintain communication fidelity while transferring higher power levels, resolving the contradiction between power capability and communication reliability
Solution Approach 2:
The patent changes the temporal parameters (rise time and fall time) of the power signal through the damping circuit. By controlling these parameters, the system ensures that ASK communication signals can be properly detected even at power levels above 300 mW, thus maintaining communication fidelity while enabling higher power transfer
2Productivity
If damping circuit is implemented to reduce rise and fall times, then data rate and range are improved, but system complexity increases
Solution Approach 1:
The damping circuit serves multiple functions simultaneously: it controls rise and fall times for communication fidelity, enables higher power transfer capability, and extends communication range. By making this single circuit multi-functional, the patent improves data rate and range without proportionally increasing system complexity
Solution Approach 2:
The patent combines the damping function with the existing wireless power transfer system architecture. Rather than adding separate communication control circuits, the damping circuit is integrated into the power signal path, merging power control and communication functions into a unified system that reduces overall complexity
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
This approach allows for higher power wireless power transfer (greater than 300 mW) while maintaining data communication fidelity, preventing damage to legacy hardware and ensuring efficient power transfer without signal degradation.
Implementation Method 1
an amplifier, and a damping circuit. The damping circuit is configured to dampen the AC wireless signal during transmission of the ASK wireless data signals
Implementation Method 2
Such systems often use 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
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.