Inductive Power Coil Resonant Frequency Distance Detection
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Solution Overview
Problem
In induction type power supply systems, the existing methods fail to accurately detect the distance between the power supply device and the power receiving device, leading to inadequate power adjustment, which can result in either excessive power causing device burnout or insufficient power leading to operational interruptions.
Innovation Solution
A method that detects the resonant frequency of the supplying-end coil to determine the distance between the receiving-end and supplying-end modules, sets the maximum and minimum resonant voltages accordingly, and uses a processor to assess deviations based on these voltages and input current to adjust power delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power adjustment is limited within a predetermined maximum resonant voltage, then device safety is improved, but power delivery adequacy deteriorates
Solution Approach 1:
The patent implements dynamic power adjustment by continuously monitoring the distance between transmitting and receiving coils and adjusting the resonant voltage accordingly. The system transitions from static predetermined voltage limits to dynamic voltage control based on real-time distance measurements, allowing the power delivery to adapt to changing operational conditions while maintaining safety margins.
Solution Approach 2:
The patent employs feedback mechanisms where the detected distance information is fed back to the control system, which then adjusts the resonant voltage to optimize power delivery. This closed-loop control ensures that the power supplied matches the actual needs of the receiving device based on its distance from the transmitter, preventing both over-power and under-power conditions.
2Device complexity
If distance detection is not implemented, then device complexity is reduced, but power delivery precision deteriorates
Solution Approach 1:
The patent replaces complex mechanical or optical distance measurement systems with an electrical measurement approach. By measuring changes in resonant frequency caused by distance variations, the system achieves accurate distance detection using simple electrical components and signal processing, avoiding the need for complex mechanical sensors or optical systems.
Solution Approach 2:
The patent utilizes parameter changes in the resonant frequency of the coils as a function of distance. Instead of directly measuring distance, the system measures the shift in resonant frequency caused by distance variations and uses this parameter change to infer distance information, enabling precise measurement through electrical parameter monitoring rather than direct physical measurement.
3Power
If resonant voltage is increased to compensate for distance, then power delivery is improved, but device safety deteriorates
Solution Approach 1:
The patent implements dynamic voltage control where the resonant voltage is continuously adjusted based on the detected distance between coils. Rather than using a fixed high voltage to ensure sufficient power delivery, the system dynamically sets the voltage level appropriate for the current distance, ensuring adequate power transmission while preventing excessive voltage that could cause device damage.
Solution Approach 2:
The system uses feedback from distance detection to control the resonant voltage level. The control system receives distance information and adjusts the voltage accordingly, creating a closed-loop control mechanism that prevents voltage from exceeding safe levels while ensuring sufficient power delivery for the given distance, thus eliminating the need for overly conservative voltage limits.
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 allows for precise power adjustment, preventing device burnout and ensuring stable operation by accurately determining the distance and voltage settings, thereby optimizing power delivery between the modules.
Implementation Method 1
the power supply device drives the supplying-end coil to generate resonance and send electromagnetic power to the power receiving device for power delivery
Implementation Method 2
the power receiving device may change the impedance on the receiving-end coil via the signal modulation technology, and the variations are fed back to vary the resonant carrier signals
Implementation Method 3
drives the supplying-end coil to generate resonance
Data Source
AI summary
A method of detecting a receiving-end module for a supplying-end module of an induction type power supply system, wherein the supplying-end module includes a supplying-end coil, includes the steps of: detecting a resonant frequency of the supplying-end coil; determining a coil distance of the receiving-end module and the supplying-end module according to the resonant frequency; obtaining a maximum resonant voltage and a minimum resonant voltage corresponding to the coil distance; and determining whether there is a deviation between the supplying-end module and the receiving-end module according to the maximum resonant voltage and the minimum resonant voltage and an input current of the supplying-end coil.