Wireless Power Transmitter Control via Coil Current and Voltage Estimation
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Solution Overview
Problem
Wireless power transmission systems face challenges in efficiently adjusting power delivery in real-time to meet changing load conditions, leading to potential voltage fluctuations and reduced responsiveness due to latency in communication feedback loops.
Innovation Solution
Incorporating measurement circuitry in both the wireless power transmitting and receiving devices to estimate operating parameters, such as coil currents and voltages, and using a circuit network model to make low-latency adjustments to power transmission, allowing for rapid estimation and adjustment of power levels without relying solely on in-band feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the wireless power receiving device sends feedback commands through in-band communication to request power adjustments, then the power transmission can be adjusted to meet load conditions, but the system experiences latency that reduces responsiveness to sudden load changes
Solution Approach 1:
The transmitter performs preliminary power adjustments based on estimated rectifier conditions before the receiver actually experiences voltage deviations. By predicting the rectifier's voltage state using the circuit model and proactively adjusting transmitted power, the system prevents voltage swings rather than reacting to them after feedback is received.
Solution Approach 2:
A circuit network model acts as an intermediary between the transmitter and receiver, allowing the transmitter to estimate receiver-side conditions (rectifier voltage and current) without direct feedback. This virtual intermediary provides real-time information about receiver state, enabling responsive control without the latency of actual feedback communication.
2Ease of operation
If the system relies on periodic feedback from the receiving device to adjust power transmission, then communication between devices is simplified, but the responsiveness to sudden load changes is reduced due to feedback latency
Solution Approach 1:
The transmitter independently determines optimal power levels by using its own measurements of transmitted voltage and current, combined with the circuit model, to estimate receiver conditions. This self-service approach eliminates the need for complex bidirectional communication protocols while achieving rapid power adjustment, as the transmitter makes autonomous control decisions.
Solution Approach 2:
The system implements a virtual feedback mechanism where the circuit model provides real-time estimates of receiver voltage and current back to the transmitter's control logic. This modeled feedback loop enables continuous power optimization without requiring actual physical feedback signals from the receiver, thus maintaining communication simplicity while achieving fast response.
3Loss of time
If the wireless power transmitting device uses real-time measurements and circuit modeling to estimate rectifier conditions, then power transmission can be adjusted with low latency, but the system complexity increases due to the need for measurement circuitry and modeling computations
Solution Approach 1:
The measurement circuitry performs multiple functions: it measures transmitted voltage and current for power calculation, provides data for the circuit model to estimate receiver conditions, and enables both active power control and passive foreign object detection. This multi-functionality reduces the need for separate dedicated circuits, thereby limiting the increase in overall system complexity.
Solution Approach 2:
The control algorithm merges the circuit model computations with the existing power management logic in the transmitter. By integrating the voltage and current estimation functions into the existing control processor rather than adding separate hardware blocks, the system achieves low-latency power adjustment while minimizing the increase in device complexity.
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 approach enhances the responsiveness of the system by enabling timely adjustments to power transmission, reducing undesired voltage swings, and maintaining stable rectifier output voltage, even during sudden load changes, while minimizing latency and ensuring accurate power delivery.
Implementation Method 1
a wireless power transmitting device such as a charging mat wirelessly transmits power to a wireless power receiving device
Implementation Method 2
The rectifier circuitry converts the received signals into direct-current power
Data Source
AI summary
A wireless power system has a wireless power transmitting device and a wireless power receiving device. The wireless power transmitting device and wireless power receiving device may include control circuitry that measures operating parameters. During wireless power transmission operations, the wireless power receiving device may periodically send feedback to the wireless power transmitting device such as in-band wireless power adjustment commands requesting that the wireless power transmitting device adjust the amount of power being transmitted from the wireless power transmitting device to the wireless power receiving device. Faster estimates of desired adjustments to the amount of transmitted power can be made by the wireless power transmitting device using real-time measurements of wireless power transmitting device coil current and wireless power transmitting device coil voltage.