Wireless Power Transmission Voltage Stabilization
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Solution Overview
Problem
Wireless power transmission systems face issues with dispersion and vibration in rectified voltage due to communication delays and interference, leading to unstable operation and potential shutdowns when feedback delays extend, and they often incorrectly respond to expected voltage fluctuations.
Innovation Solution
The system includes a power supply device with a power supply coil, inverter, and radio unit, and a power receiving device with a resonant circuit and radio unit, where the power receiving device periodically transmits voltage information and a circulation index, allowing the power supply device to adjust its output without delay and prevent protection operations during expected voltage fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the feedback control period is extended to account for communication delay, then the system can handle delayed feedback, but the rectified voltage exhibits dispersion and vibration due to improper control
Solution Approach 1:
The system performs preliminary actions by predicting expected voltage fluctuations before they occur. The determination unit identifies when voltage changes are expected based on load characteristics, and the control unit pre-adjusts or prepares for these changes, preventing the need for extended feedback periods while maintaining voltage stability.
Solution Approach 2:
The system uses feedback from the determination unit about expected voltage fluctuations to modify the control strategy. When voltage fluctuations are predicted, the control unit adjusts its behavior accordingly, creating a closed-loop system that responds to anticipated conditions rather than reacting to delays.
2Reliability
If the power supply device performs protection operation when rectified voltage exceeds voltage range, then it prevents voltage damage, but it incorrectly shuts down during expected voltage fluctuations caused by load changes
Solution Approach 1:
The determination unit acts as an intermediary between the voltage detection mechanism and the protection operation. It analyzes whether voltage excursions are expected (due to normal load changes) or unexpected (potential faults), and only triggers protection operations for unexpected conditions. This mediator prevents false shutdowns while maintaining necessary protection.
Solution Approach 2:
The system dynamically changes the voltage threshold parameters based on the operational state. When expected voltage fluctuations are detected, the voltage range thresholds are temporarily adjusted to accommodate normal variations, preventing false protection operations while maintaining protection against actual abnormal conditions.
3Loss of information
If wireless communication packets are used for voltage feedback, then the system can transmit voltage information, but communication packet loss and delay occur due to crosstalk and electromagnetic noise
Solution Approach 1:
The system implements a feedback mechanism where the determination unit continuously monitors voltage information from communication packets and compares it with expected voltage ranges. When packets are lost or delayed, the system can infer the state based on load information and previous measurements, maintaining reliable operation despite communication issues.
Solution Approach 2:
The system prepares for communication failures by establishing expected voltage ranges and fluctuation patterns in advance. When communication packets are lost due to noise or interference, the system uses these pre-established expectations to determine whether voltage conditions are normal, cushioning against the impact of communication reliability issues.
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 stabilizes the rectified voltage, preventing dispersion and vibration, and ensures continuous operation even with extended feedback delays, by minimizing communication packet losses and adjusting radio output levels to maintain proper feedback control.
Implementation Method 1
a resonant circuit including a power receiving coil wirelessly receiving electric power from the power supply coil of the power supply device and a capacitor to generate a resonant voltage
Implementation Method 2
a rectifying circuit rectifying the resonant voltage to output a rectified voltage
Implementation Method 3
an inverter driving the power supply coil
Data Source
AI summary
The wireless power transmission system includes a power supply device and a power receiving device. The power supply device includes a power supply coil, an inverter driving the power supply coil and a radio and a first processor. The power receiving device includes a resonant circuit wirelessly receiving electric power from the power supply coil, a rectifying circuit DB outputting a rectified voltage, a load, a radio unit and a second processor. The second processor transmits a communication packet in a predetermined period of time, the communication packet including information about a rectified voltage value and a circulation index value indicating transmission sequence. The first processor outputs a signal according to the rectified voltage value included in the communication packet every time the first processor receives the communication packet without delay.