Framing Pulse for Wireless Power Communication Noise
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Solution Overview
Problem
Wireless power supply systems face disruptions due to noisy loads, particularly when the device being powered presents a noisy load at the same frequency as data communications, leading to misinterpretation of noise as legitimate signals, which can delay recognition of actual data transmissions.
Innovation Solution
A wireless power supply system that includes a remote device with a communication transmitter capable of sending a framing pulse, which is a signal pattern with no transitions, to reset the communication receiver and prevent misinterpretation of noise as legitimate data, ensuring the receiver is ready to decode actual messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the communication receiver continuously monitors the inductive field for data transmissions, then communication responsiveness is improved, but noise at the same frequency as data communications is misinterpreted as legitimate signals, causing false detections and delays
Solution Approach 1:
The framing pulse is transmitted before the actual data communication to preliminarily mark the start of a legitimate transmission. This preliminary action allows the communication receiver to distinguish between noise and actual data by expecting a specific pattern (framing pulse followed by data) rather than reacting to every signal change, thereby maintaining responsiveness while improving detection accuracy
Solution Approach 2:
The framing pulse acts as an intermediary signal between the noisy inductive field and the data communication. It provides a recognizable pattern that mediates the transition from potential noise to confirmed data transmission, allowing the receiver to validate signals before processing them as legitimate communications
2Reliability
If the communication receiver processes every detected signal as potential data, then no legitimate data is missed, but processing time is wasted on illegitimate signals and noise patterns
Solution Approach 1:
The framing pulse serves as a preliminary marker that prepares the communication receiver to expect and process subsequent data. By requiring this preliminary pattern, the system avoids processing isolated noise signals while ensuring that any legitimate data transmission (preceded by a framing pulse) is captured and processed efficiently
Solution Approach 2:
The system uses the expected framing pulse pattern as feedback to validate incoming signals. When the receiver detects the specific framing pattern, it confirms legitimate data transmission and proceeds with processing; when the pattern is absent or incorrect, the signal is discarded as noise, preventing wasted processing time on illegitimate signals
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 framing pulse effectively clears the communication buffer and ensures the receiver is not occupied with illegitimate signals, allowing for accurate recognition and decoding of legitimate data transmissions, improving communication efficiency in wireless power transfer systems.
Implementation Method 1
Backscatter modulation relies on the principle that the impedance of the remote device is conveyed back to the power supply through reflected impedance. With backscatter modulation, the impedance of the remote device is selectively varied to create a data stream (e.g. a bit stream) that is conveyed to power supply by reflected impedance.
Implementation Method 2
A typical inductive power transfer system includes an inductive power supply that uses a primary coil to wirelessly transfer energy in the form of a varying electromagnetic field and a remote device that uses a secondary coil to convert the energy in the electromagnetic field into electrical power.
Data Source
AI summary
A wireless power transfer system with a remote device having a communication transmitter configured to initiate communications with a framing pulse to prevent noise from being mistaken for legitimate data. The communication system may employ a bi-phase modulation scheme, and the framing pulse may be generated to present no transitions in the communication signal during a specified period of time. The communication transmitter may produce the framing pulse by applying a load in the remote device. The present invention also provides a method for transmitting communication signals in a wireless power supply system including the general steps of: (a) preceding each communication with a framing pulse configured to present a bit sequence that does not exist in legitimate data communications, (b) maintaining the framing pulse for a period of time sufficient to effectively “reset” the communications receiver and (c) transmitting communications following the framing pulse.