Current Signal Sensing for Inductive Power Supply Systems
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Solution Overview
Problem
Existing induction type power supply systems face challenges in accurately interpreting small voltage and current variations due to noise and amplification issues, leading to unreliable signal modulation and limited data transmission speed, especially under full-load conditions, and require complex circuits that increase cost and reliability concerns.
Innovation Solution
A current signal sensing method for the supplying-end module of an induction type power supply system that includes a current sensing element and a control unit to directly interpret current signals without filtering, using the time difference between current and driving signals to determine load status and metal object presence, and automatically adjusts voltage levels to enhance signal retrieval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage and current variations are retrieved through coil voltage detection circuit and low-pass filtering, then signal processing is performed, but the variations are small and require amplification which increases circuit complexity and reduces reliability
Solution Approach 1:
The patent extracts only the necessary signal processing function by directly detecting current variations through the supplying-end coil without requiring complex voltage detection circuits and low-pass filtering stages. The current signal is obtained directly from the coil, eliminating multiple circuit stages and reducing overall system complexity while maintaining detection accuracy.
Solution Approach 2:
The supplying-end coil serves multiple functions: it generates electromagnetic power for transmission and simultaneously acts as the sensing element for detecting current variations. This multi-functionality eliminates the need for separate detection circuits, reducing component count and improving reliability while maintaining measurement precision.
2Measurement precision
If amplification ratio is increased to make small variations clear, then signal interpretation becomes possible, but the signal easily blends with noise reducing reliability
Solution Approach 1:
The patent changes the detection parameter from voltage to current, and specifically detects the variation of current at the supplying-end coil. By focusing on current variation rather than absolute current or voltage signals, the system achieves clear signal interpretation without requiring high amplification ratios, thus avoiding noise blending issues and improving signal stability.
3Power
If transmitted power is increased, then power delivery is improved, but the modulation ratio is reduced making data code interpretation more difficult
Solution Approach 1:
The patent replaces the traditional voltage-based detection system with a current-based detection system. By detecting current variation directly at the supplying-end coil, the system maintains high modulation ratio even when transmitted power is increased, as the current signal directly reflects the load status and data modulation without being diluted by power level changes.
4Reliability
If signals undergo filtering before interpretation, then noise is reduced, but the variations require several cycles to pass through the filter limiting data transmission speed
Solution Approach 1:
The patent extracts and detects the current signal directly from the supplying-end coil without subjecting it to filtering operations. By using the supplying-end coil as both the power transmission element and the sensing element, the system obtains current variation signals that are inherently suitable for direct interpretation, eliminating the need for filtering and thus removing the speed limitation imposed by filter cycle requirements.
5Adaptability or versatility
If a large number of electronic elements are used in the signal analysis circuit, then signal processing capability is improved, but the cost increases and reliability decreases
Solution Approach 1:
The patent makes the supplying-end coil multi-functional by using it both for electromagnetic power transmission and for sensing current variations. This eliminates the need for separate signal analysis circuits with multiple electronic elements, reducing component count, lowering cost, and improving reliability while maintaining the capability to process and interpret signals for load status and data code 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 enhances signal processing speed and reliability by eliminating the need for filtering, reduces the number of circuit elements, and improves data transmission accuracy and speed, while maintaining high reliability and low cost.
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
a current sensing element, serially connected between the supplying-end coil and the resonant capacitor, for obtaining a current signal corresponding to a current of the supplying-end coil
Data Source
AI summary
A current signal sensing method for a supplying-end module of an induction type power supply system, wherein the supplying-end module includes a supplying-end coil and a resonant capacitor, includes serially connecting a current sensing element between the supplying-end coil and the resonant capacitor to obtain a current signal corresponding to a current of the supplying-end coil; and interpreting the current signal to retrieve data of a receiving-end module of the induction type power supply system.