Wireless Power Receiver Oscillation Control via Headroom Adjustment
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Solution Overview
Problem
Wireless power systems experience oscillations at the receiver due to strong communication pulses and load variations, leading to output instability and reduced efficiency, particularly when the voltage difference between the rectifier output and power system output is small.
Innovation Solution
Incorporating a detector and oscillation determiner in the receiver to monitor voltage and current, generating signals to adjust power transmission and prevent oscillations by increasing or decreasing power until stability is achieved, with a predefined headroom to maintain non-oscillating states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the voltage difference between rectifier output voltage and power system output voltage is kept small to improve efficiency, then system efficiency is improved, but the receiver becomes susceptible to oscillations due to communication pulses and load variations
Solution Approach 1:
The system performs preliminary action by identifying the oscillation threshold through iterative power adjustment before normal operation. The receiver determines the threshold by adjusting power until oscillation occurs, then sets the operating power above this threshold by a predefined headroom. This preliminary characterization prevents oscillations during subsequent operation while maintaining high efficiency.
Solution Approach 2:
The system implements feedback by continuously monitoring the oscillation state of the receiver and adjusting the power transmission accordingly. The receiver detects when oscillation occurs and communicates this back to the transmitter, which then adjusts the power level to prevent or stop oscillations, creating a closed-loop control system that balances efficiency and stability.
2Stability of the object's composition
If power transmission is increased to prevent oscillations, then receiver stability is improved, but system efficiency decreases due to larger voltage difference
Solution Approach 1:
The system applies parameter changes by dynamically adjusting the power transmission level based on the oscillation threshold and predefined headroom. Instead of using a fixed conservative power level, the system adapts the power parameter to be just above the oscillation threshold, optimizing the balance between stability and efficiency. This allows the system to operate at higher efficiency while maintaining stability through precise parameter control.
3Loss of energy
If the system operates at the oscillation threshold to maximize efficiency, then system efficiency is maximized, but the receiver becomes unstable and oscillates
Solution Approach 1:
The system performs preliminary action by identifying the oscillation threshold through iterative power adjustment before normal operation. The receiver determines the threshold by adjusting power until oscillation occurs, then sets the operating power above this threshold by a predefined headroom. This preliminary characterization prevents oscillations during subsequent operation while maintaining high efficiency.
Solution Approach 2:
The system applies beforehand cushioning by introducing a predefined headroom above the oscillation threshold. This headroom acts as a safety margin or cushion that prevents the system from operating at the critical oscillation point, ensuring reliability while minimizing the efficiency penalty. The headroom provides a buffer against variations in communication pulses and load changes.
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 solution effectively stabilizes the receiver, preventing oscillations and maintaining high efficiency by dynamically adjusting power transmission based on oscillation detection, ensuring reliable wireless power transfer.
Implementation Method 1
a rectifier that is coupled to the receiver and may receive power from a receiver coil
Data Source
AI summary
A wireless power system includes a receiver. The receiver may include a rectifier coupled to a receiver coil to receive power. The receiver may include a detector coupled to the rectifier to receive a monitor signal from the rectifier. The detector may provide a range signal indicating whether the monitor signal is outside a predetermined range. The receiver further includes an oscillation determiner coupled to the detector to receive the range signal. The oscillation determiner may determine that the rectifier is in an oscillation mode or is not in an oscillation mode. In some embodiments a communication unit is coupled to the oscillation determiner. The oscillation determiner may communicate a power adjustment signal and may request increased power through the communication unit.