Wireless Power Control via Error Threshold Feedback
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Solution Overview
Problem
Wireless power transfer systems face issues when a receiver is quickly moved in and out of the transmitter's magnetic field, leading to excessive magnetic field strength exposure for receivers not designed to handle higher power levels, potentially causing damage due to abnormal current flow and impedance changes.
Innovation Solution
Implementing a system where the receiver generates and sends error messages to the transmitter to control output levels based on power error thresholds, allowing the transmitter to perform corrective actions such as switching off or reducing power to prevent damage, and the receiver can isolate its load to protect itself.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the transmitter operates at full output to maintain maximum transmission distance, then the transmission distance is improved, but the receiver may be exposed to excessive magnetic field strength when quickly reintroduced into the field
Solution Approach 1:
The system implements feedback control by continuously monitoring the power error between required and received power at the receiver. When the receiver is quickly reintroduced into the magnetic field, the feedback mechanism detects the power discrepancy and triggers corrective actions to adjust transmitter output, preventing excessive magnetic field exposure while maintaining optimal transmission distance.
Solution Approach 2:
The system performs preliminary actions by implementing protection protocols before excessive power transfer can occur. When a power error threshold is exceeded for a threshold time, the transmitter proactively reduces output power or shuts off before the receiver can be damaged by excessive magnetic field strength, rather than waiting for damage to occur.
2Reliability
If the transmitter increases output power to compensate for receiver movement, then the power transfer reliability is improved, but the receiver capacitances become depleted leading to higher system Q and abnormal current flow
Solution Approach 1:
The feedback mechanism monitors power error continuously and detects when receiver capacitances are depleted by observing deviations between required and received power. This triggers corrective actions to reduce transmitter output, preventing the system Q from becoming excessively high and avoiding abnormal current flow conditions.
Solution Approach 2:
The system dynamically adjusts transmitter output power based on real-time receiver conditions. When capacitance depletion is detected through power error monitoring, the transmitter adapts its output level to match receiver capabilities, maintaining stable operation and preventing harmful impedance changes while ensuring reliable power transfer.
3Reliability
If existing regulation methods are used to reset or lower transmitter output, then the system protection is improved, but the receiver may already be damaged by the time corrective action occurs
Solution Approach 1:
The system takes preliminary protective action by monitoring power error thresholds continuously and triggering corrective measures before damage can occur. When the power error exceeds the threshold for the threshold time, the transmitter immediately reduces output or shuts off, preventing receiver damage rather than waiting for existing regulation methods to activate after damage has already occurred.
Solution Approach 2:
The feedback mechanism provides real-time monitoring of power transfer conditions and immediately triggers protection protocols when anomalies are detected. This rapid feedback loop eliminates the time delay inherent in existing regulation methods by continuously comparing required versus received power and instantly responding to deviations that indicate potential damage.
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 solution effectively manages magnetic field strength and operating levels, preventing damage to receivers and transmitters by dynamically adjusting power transfer in response to changing conditions, ensuring safe operation across different power profiles and receiver types.
Implementation Method 1
An example of a wireless power transfer system is an inductive power transfer (IPT) system that uses magnetic or electromagnetic induction as a mechanism of power transfer between the transmitter and receiver.
Data Source
AI summary
A system for wireless power transfer control comprising a receiver for receiving and consuming power, a transmitter for transmitting power, wherein the receiver is configured to generate and send a message to the transmitter, the transmitter is configured to control an output level transmitted to the receiver based on the message, and wherein the receiver or the transmitter is configured to perform a corrective action if a magnitude of the message exceeds a power error threshold for a threshold time.