Automatic Gain Control for Wireless Power Demodulation
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Solution Overview
Problem
Existing wireless power transfer systems face inefficiencies in in-band data transfer due to varying relative positions and orientations of sender and receiver, leading to signal strength changes that can cause previously readable signals to become faint or saturated, requiring more computational resources for accurate demodulation.
Innovation Solution
A wireless transmission system incorporating a demodulation circuit with automatic bias control and gain control, utilizing a slope detection circuit and comparator circuit to detect changes in electrical signals and generate alerts, allowing for efficient decoding of data signals even with dynamic coupling conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If in-band data transfer is used to reduce system complexity, then device complexity is reduced, but measurement precision deteriorates due to signal strength variations
Solution Approach 1:
The patent implements automatic gain control (AGC) that dynamically adjusts the gain of the demodulation circuit based on the detected signal strength. This dynamic adjustment allows the system to maintain optimal signal detection accuracy across varying coupling conditions without requiring complex adaptive processing algorithms, thus resolving the contradiction between simplified device complexity and maintained measurement precision.
Solution Approach 2:
The system changes the electrical parameter (gain) of the demodulation circuit in response to signal strength variations. By monitoring the input signal level and adjusting the gain accordingly, the system maintains consistent detection accuracy despite changes in coupling strength, thereby achieving high measurement precision with a relatively simple parameter-adjustment mechanism rather than complex system architecture.
2Measurement precision
If additional processing is applied to maintain signal accuracy under varying conditions, then measurement precision is improved, but use of energy increases
Solution Approach 1:
The patent applies preliminary gain adjustment based on initial signal strength assessment. The AGC circuit pre-adjusts the signal amplitude to an optimal range before further processing, which simplifies subsequent detection operations and reduces the computational energy required for accurate data signal detection under varying coupling conditions.
3Adaptability or versatility
If the system adapts to dynamic coupling conditions, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the output of the demodulation circuit is monitored and used to adjust the gain of the circuit. This closed-loop feedback system enables the demodulation circuit to automatically adapt to dynamic coupling conditions and maintain optimal performance without requiring complex adaptive algorithms or additional control logic, thus achieving high adaptability with minimal increase in device complexity.
4Measurement precision
If signal gain is increased to detect faint signals, then measurement precision is improved, but object-generated harmful factors worsen due to saturation
Solution Approach 1:
The patent employs dynamic gain control that automatically adjusts the signal gain based on the detected signal strength. When faint signals are detected, the gain is increased to improve detectability; when strong signals are detected, the gain is reduced to prevent saturation. This dynamic adjustment resolves the contradiction between detecting faint signals and avoiding saturation of strong signals.
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 system reduces computational resources needed for data signal decoding, enabling the use of less capable processors and maintaining data transfer accuracy across varying coupling strengths, thus improving throughput and reducing Bill of Materials (BOM) costs.
Implementation Method 1
inductive and/or resonant inductive wireless power transfer, which occurs when magnetic fields created by a transmitting element induce an electric field and, hence, an electric current, in a receiving element
Implementation Method 2
determine a voltage rate of change for a voltage of the AC wireless signals... compare the modified voltage rate of change to a rising rate of change... compare the modified voltage rate of change to a falling rate of change
Data Source
AI summary
A wireless transmission system includes a transmitter antenna, a sensor, a demodulation circuit, and a transmitter controller. The sensor is configured to detect electrical information superimposed on an AC wireless signal. The demodulation circuit is configured to receive the electrical information from the at least one sensor, apply automatic bias control and gain control to generate modified electrical information, detect a change in the modified electrical information and determine if the change in the modified electrical information meets or exceeds one of a rise threshold or a fall threshold. If the change exceeds one of the rise threshold or the fall threshold, an alert is generated. Alerts are decoded into the electrical information.