External FET Buck Rectifier for WPT Overvoltage Control
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Solution Overview
Problem
Current wireless power transfer (WPT) systems face issues with overvoltages, which can damage communication devices and result in intermittent shutdowns of the charging process, hindering efficient communication between the charging device and the device being charged.
Innovation Solution
A WPT receiving circuit that includes field effect transistor (FET)-containing circuitry, capable of dynamically changing impedance to reduce incoming voltage under overvoltage conditions without shutting down the charging process, using a switch network and a controller to rectify the wireless power input and manage the output voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If current overvoltage protection solutions are implemented, then device safety is improved, but charging process continuity deteriorates due to intermittent shutdowns
Solution Approach 1:
The patent introduces an external FET as an intermediary component between the WPT receiver and the device circuitry. This external FET acts as a voltage control mediator that can dynamically adjust impedance to buck overvoltages without shutting down the charging process, thereby protecting device safety while maintaining charging continuity
Solution Approach 2:
The patent changes the electrical parameter (impedance) of the external FET dynamically in response to detected overvoltage conditions. By adjusting the FET's impedance state based on voltage threshold comparisons, the system can continuously regulate voltage levels without interrupting the charging process
2Object-affected harmful factors
If overvoltage protection is implemented, then device safety is improved, but communication efficiency deteriorates due to charging shutdowns
Solution Approach 1:
The external FET serves as a mediator that decouples the overvoltage protection function from the charging process control. This allows the system to protect against overvoltages while maintaining uninterrupted communication between the WPT transmitter and the communication device
Solution Approach 2:
The patent ensures continuous operation of the charging process and communication by using the external FET to actively regulate voltage rather than shutting down. The useful actions of charging and communicating continue uninterrupted while overvoltage protection is actively maintained
3Adaptability or versatility
If switch network rectification is used, then voltage regulation capability is improved, but device complexity increases
Solution Approach 1:
The patent extracts the voltage regulation function into a separate external FET component rather than integrating it into the main device circuitry. This externalization simplifies the internal device complexity while maintaining comprehensive voltage regulation capability through the dedicated external component
Solution Approach 2:
The patent segments the voltage regulation system into distinct components: the switch network for rectification and the external FET for overvoltage protection. This segmentation allows each component to perform its specialized function efficiently while keeping the overall system architecture clear and manageable
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 regulates voltage to prevent damage from overvoltages, ensuring continuous charging and communication between the charging device and the user device without interrupting the charging process.
Implementation Method 1
FET-containing circuitry that dynamically changing impedance to reduce incoming voltage under overvoltage conditions
Implementation Method 2
switch network configured to rectify the wireless power input and generate a rectified voltage
Data Source
AI summary
A system is disclosed. The system includes a first circuit that includes a first receiver configured to receive a wireless power input, a first conductor, and operably coupled to the first receiver, and a switch network operably coupled to the first conductor configured to rectify the wireless power input and generate a rectified voltage. The first circuit further includes a first field effect transistor operably coupled to the first conductor and configured to receive a portion of the wireless power input from the first conductor and output an output voltage back to the first conductor based upon a gate input. In one or more embodiments, the first circuit further includes a first controller configured to determine if the rectified voltage is greater than a voltage threshold and transmit a transmission of the gate input to the first field effect transistor if the rectified voltage is above the voltage threshold.