Resonant Wireless Power Over-Voltage Protection via Detuning
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Solution Overview
Problem
Existing wireless power transmission and reception systems face challenges in achieving rapid over-voltage protection and efficient power handling due to size constraints, particularly in devices with limited mounting space, as traditional solutions like Zener diodes require a preparation period and increase in size with higher power handling capabilities.
Innovation Solution
A resonant wireless power transmission device incorporating a resonance signal generator, controller, and detuning capacitors that adjust power transmission based on over-voltage protection conditions, allowing for rapid handling and high efficiency while minimizing size, using a resonance-detuning scheme to reduce power reception during over-voltage events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a Zener diode is used for over-voltage protection in the reception device, then over-voltage protection is achieved, but the device requires a preparation period and increases in size with higher power handling requirements
Solution Approach 1:
The patent introduces a controller as an intermediary component that monitors voltage levels and controls the switching element (MOSFET) to achieve over-voltage protection. This mediator approach replaces the direct Zener diode protection mechanism, allowing for more flexible and size-efficient protection while maintaining reliability.
Solution Approach 2:
The patent replaces the passive Zener diode protection mechanism with an active electronic control system involving voltage detection circuits, control logic, and switching elements. This substitution enables dynamic response to over-voltage conditions without the size and preparation time limitations of Zener diodes.
2Reliability
If a Zener diode is used for over-voltage protection, then protection is provided, but rapid handling of over-voltage conditions is difficult due to preparation period requirements
Solution Approach 1:
The controller continuously monitors voltage levels through the detection circuit before over-voltage damage occurs. By maintaining readiness to detect and respond to voltage anomalies, the system eliminates the preparation period required by Zener diodes, achieving immediate protection when over-voltage conditions arise.
Solution Approach 2:
The patent implements a feedback mechanism where the voltage detection circuit continuously monitors the voltage state and provides real-time information to the controller. This feedback loop enables rapid detection and response to over-voltage conditions, significantly improving response speed compared to passive Zener diode protection.
3Reliability
If power handling capability is increased, then over-voltage protection effectiveness is improved, but mounting size restrictions become more significant
Solution Approach 1:
The patent divides the over-voltage protection function into separate modular components: voltage detection circuit, control logic, and switching element. This segmentation allows each component to be optimized independently for high power handling while maintaining compact individual sizes, reducing the total mounting area compared to a single large Zener diode.
Solution Approach 2:
The patent changes the operational parameters of the protection system by using active electronic control instead of passive component breakdown. The controller can dynamically adjust switching timing and duration based on power levels, enabling effective protection across a wide power range without proportionally increasing mounting area.
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 enables rapid and efficient over-voltage protection in wireless power transmission, effectively reducing power transfer during over-voltage conditions, thus preventing damage to devices and addressing size limitations in portable electronics.
Implementation Method 1
The resonant scheme uses frequency resonance between a transmission device and a reception device that use a resonance frequency
Implementation Method 2
An electromagnetic induction-based power transmission method involves transferring power between a primary coil and a secondary coil
Implementation Method 3
an over-voltage protector configured to detune a resonance frequency of the resonance signal receiver when a predetermined condition caused by over-voltage protection operation at the wireless power reception device is detected
Data Source
AI summary
A wireless power transmission device is provided. The wireless power transmission device includes a resonance signal generator and a controller. The resonance signal generator is configured to transmit wireless power to a wireless power reception device. The controller is configured to adjust the wireless power transmitted to the wireless power reception device, when a predetermined condition caused by over-voltage protection operation at the wireless power reception device is detected.