Inductive Power Supply Coil Self-Resonant Frequency Detection
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Solution Overview
Problem
Existing induction type power supply systems face issues with electromagnetic interference (EMI) and excessive power losses due to continuous energy delivery for detecting power receiving devices, and struggle to accurately determine the distance between the power supply device and the receiving device, leading to potential device burnout or ineffective detection.
Innovation Solution
A method that detects the self-resonant frequency of the supplying-end coil to determine the presence and distance of a receiving-end module, allowing for adaptive power output and reducing energy delivery to minimize EMI and power losses, using a processor-controlled system with a resonant capacitor and magnetic conductor to enhance electromagnetic induction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous energy delivery is used to detect power receiving devices, then detection reliability is improved, but electromagnetic interference and power losses increase
Solution Approach 1:
The system performs detection at specific periodic intervals rather than continuously. The processor controls the supplying-end coil to operate in detection mode at predetermined times, sending detection energies periodically to identify receiving-end devices. This periodic operation reduces continuous energy delivery, thereby minimizing electromagnetic interference and power losses while maintaining reliable detection capability.
2Measurement precision
If high energy is sent to detect receiving-end module, then detection sensitivity is improved, but risk of device burnout increases
Solution Approach 1:
The system dynamically adjusts the energy level of the supplying-end coil based on operational mode. In detection mode, the processor controls the coil to send lower energy levels sufficient for identifying receiving-end devices. In power supply mode, higher energy levels are used when actual power transfer is needed. This dynamic adjustment ensures detection sensitivity while preventing device burnout by avoiding excessive energy during detection phases.
3Object-affected harmful factors
If low energy is sent to detect receiving-end module, then safety is improved, but detection effectiveness decreases
Solution Approach 1:
The system performs preliminary detection using low energy levels in detection mode before initiating power supply. The processor first sends detection energies to identify the presence of receiving-end modules and verify their readiness. Only after successful detection and confirmation does the system transition to power supply mode with higher energy levels. This preliminary action ensures device safety while maintaining detection effectiveness through a two-stage approach.
4Speed
If continuous detection is performed, then real-time monitoring is improved, but power losses increase
Solution Approach 1:
The system implements periodic detection cycles where the processor controls the supplying-end coil to alternate between detection mode and power supply mode. Detection is performed at specific intervals rather than continuously, reducing the time duration of energy delivery for detection purposes. This periodic approach maintains real-time monitoring capability by regularly checking for receiving-end devices while significantly reducing overall power losses compared to continuous detection.
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 significantly reduces EMI and power losses, enables faster detection of receiving-end modules, and ensures appropriate power delivery by determining the distance, thereby preventing device burnout and improving detection sensitivity.
Implementation Method 1
the power supply device drives the supplying-end coil to generate resonance and sends electromagnetic power to the power receiving device
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 amplitude of carriers on the supplying-end coil
Data Source
AI summary
A method of detecting a receiving-end module, for a supplying-end module of an induction type power supply system where the supplying-end module includes a supplying-end coil, includes detecting the supplying-end coil to obtain a self-resonant frequency of the supplying-end coil; determining whether the self-resonant frequency is smaller than a basic frequency; obtaining a first output power corresponding to the self-resonant frequency when the self-resonant frequency is determined to be smaller than the basic frequency and the degree of the self-resonant frequency smaller than the basic frequency exceeds a threshold; and sending an activation signal with the first output power, and starting to supply electric power when a data code corresponding to the activation signal is received.