High-Frequency Wireless Power Transfer With Damping and Isolation
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Solution Overview
Problem
Current high frequency wireless power transfer systems face challenges in achieving higher power levels without damaging circuitry or degrading communications, particularly at power levels above 300 mW, and often require additional antennas and circuitry that increase cost, complexity, and electromagnetic interference.
Innovation Solution
The implementation of a damping circuit to control rise and fall times of AC wireless signals and a voltage isolation circuit to enable efficient data communication at higher power levels, using components like damping diodes, capacitors, and resistors, and inexpensive isolation capacitors to protect legacy microprocessors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional antennas and circuitry are used for data communication, then 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 handles data communication by modulating the load, eliminating the need for separate communication antennas and reducing system complexity.
Solution Approach 2:
The transmitting and receiving circuits are designed to perform multiple functions: power transfer and data communication. The load modulation technique allows the receiver to communicate data back to the transmitter using the same electrical connection used for power reception.
2Reliability
If additional antennas and circuitry are used for data communication, then communication capability is improved, but electromagnetic interference worsens
Solution Approach 1:
By merging power transfer and communication into a single channel, the patent eliminates out-of-band interference between separate antennas. The load modulation technique communicates data through subtle variations in power consumption rather than emitting separate electromagnetic signals.
3Power
If higher power levels are used in high frequency systems, then power transfer capability is improved, but circuit damage risk increases
Solution Approach 1:
The patent changes the operating parameters of high frequency circuits to handle higher power levels safely. This includes using appropriate impedance matching, selecting components rated for higher power, and implementing protection circuits that monitor and respond to abnormal conditions.
4Power
If higher power levels are used in high frequency systems, then power transfer capability is improved, but communication fidelity deteriorates
Solution Approach 1:
The patent implements feedback mechanisms where the transmitter monitors the load modulation signals from the receiver to ensure accurate data reception. This allows for error detection and correction, maintaining communication fidelity even at higher power levels where signal integrity challenges exist.
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 higher power wireless power transfer beyond 1 W while maintaining data fidelity and reducing costs by using less costly components, minimizing electromagnetic interference, and preventing power efficiency loss.
Implementation Method 1
The amplifier includes a damping circuit configured for damping the AC wireless signal during transmission of the AC wireless signal and 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 may include a damping circuit, configured to dampen a wireless power signal such that communications fidelity is upheld at high power. Additionally or alternatively, such wireless power transfer systems may include voltage isolation circuits, to isolate components of the wireless receiver systems from high voltage signals intended for a load associated with the receiver. 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.