Wireless Power Transmitter Frequency Control via Receiver Deadtime Feedback
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Solution Overview
Problem
Wireless charging systems face inefficiencies due to sensitivity to operating frequency and input voltage, leading to elevated device temperatures and compromised performance when not operated at optimal frequencies.
Innovation Solution
A method and device for controlling the operating frequency of a wireless power transfer system by adjusting the input voltage and frequency based on deadtime information received from the receiver coil, using a microcontroller and lookup table to maintain the frequency within a target range for optimal efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If transmission power is increased to achieve high transferred power at the receiver, then the transferred power is improved, but the device temperature rises and performance is compromised
Solution Approach 1:
The system implements a feedback mechanism where deadtime information from the receiver is continuously monitored and used to adjust the transmitter operating frequency. The microcontroller determines frequency deviation from target range and dynamically adjusts the operating frequency to maintain optimal efficiency, preventing excessive temperature rise while ensuring adequate power transfer.
Solution Approach 2:
The patent changes the operating frequency parameter of the transmitter based on deadtime feedback to optimize power transfer efficiency. By adjusting the frequency within a target range, the system achieves high transferred power without the need to continuously increase transmission power, thereby controlling device temperature.
2Adaptability or versatility
If the wireless charging system is not operated at desired frequency, then the operating flexibility is improved, but the transmission power becomes uncontrolled and device performance is compromised
Solution Approach 1:
The system uses deadtime feedback from the receiver to continuously monitor and adjust the transmitter operating frequency. This feedback loop ensures the frequency remains within the target range, providing controlled transmission power while maintaining operating flexibility through dynamic adaptation to changing conditions.
Solution Approach 2:
The operating frequency is made dynamic rather than fixed, allowing the system to adapt to varying load conditions and receiver positions. The microcontroller continuously adjusts the frequency based on deadtime information, maintaining optimal efficiency across different operating scenarios without losing control over transmission power.
3Loss of energy
If deadtime information is used to adjust operating frequency, then the power transfer efficiency is improved, but the device complexity increases
Solution Approach 1:
The system implements a feedback mechanism where deadtime information from the receiver is continuously monitored and used to adjust the transmitter operating frequency. The microcontroller determines frequency deviation from target range and dynamically adjusts the operating frequency to maintain optimal efficiency, preventing excessive temperature rise while ensuring adequate power transfer.
Solution Approach 2:
The system uses its own deadtime information to automatically adjust its operating parameters. The microcontroller self-regulates the frequency based on feedback from the receiver, eliminating the need for external control systems and reducing overall device complexity while maintaining high efficiency.
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 adaptive control mechanism ensures efficient power transfer by minimizing signal oscillations during deadtime, reducing power waste, and maintaining the system within the optimal frequency range, thereby preventing overheating and improving device performance.
Implementation Method 1
wireless power transfer involves a transmitter driving a transmitter coil and a receiver with a receiver coil placed proximate to the transmitter coil. The receiver coil receives the wireless power generated by the transmitter coil
Data Source
AI summary
Embodiments described herein a method for controlling operating frequency for a wireless power charging system. Specifically, a transmitter coil at a wireless power transmitter is driven under an operating frequency and an input voltage. Deadtime information at the wireless power receiver is received, from a wireless power receiver having a receiver coil that receives wireless power from the transmitter coil. A microcontroller then determines, based on the received deadtime information or the operating frequency, whether the operating frequency deviates from a target operating frequency range. Based on the determination, one or both of the operating frequency or the input voltage are adjusted thereby causing the operating frequency to fall within the target operating frequency range.