Wireless Power Amplifier Impedance Detection and Demodulation
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Solution Overview
Problem
Existing wireless power transmission systems face challenges in efficiently communicating and controlling power delivery to target devices due to impedance changes, leading to instability and interference in signal demodulation.
Innovation Solution
The apparatus and method incorporate a detection unit to sense impedance changes in target devices, adjusting power supply accordingly, and a demodulation unit that amplifies and compares the detected power to demodulate messages, while also controlling DC voltage levels for data modulation, using a combination of amplification, ripple removal, and comparison units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power supply is adjusted based on impedance changes, then message demodulation stability is improved, but device complexity increases due to detection and control units
Solution Approach 1:
The amplifier is designed to serve dual functions: both amplifying the input signal for power transmission and detecting impedance changes through its power consumption characteristics. This multi-functionality reduces the need for separate detection circuits, thereby improving message demodulation stability while minimizing the increase in device complexity.
Solution Approach 2:
A control unit continuously monitors the power consumption of the amplifier and adjusts the power supply voltage in real-time based on detected impedance changes. This feedback mechanism ensures stable message demodulation by adapting to load variations, while the integration of control logic keeps the overall system complexity manageable.
2Reliability
If detection unit monitors power changes, then communication reliability is improved, but energy consumption increases
Solution Approach 1:
The detection unit leverages the amplifier's own power consumption characteristics as the detection mechanism. By monitoring the power already being consumed during normal operation, the system achieves reliable communication without requiring additional energy-intensive separate detection circuits.
Solution Approach 2:
The system detects impedance changes by monitoring variations in power consumption parameters of the amplifier. This approach allows reliable communication by translating physical parameter changes (power consumption) into actionable information, while avoiding the need for additional active sensing components that would increase energy usage.
3Measurement precision
If amplifier power is increased for better signal detection, then demodulation accuracy is improved, but interference and Bit Error Rate worsen
Solution Approach 1:
The amplifier's power supply voltage is dynamically adjusted in real-time based on detected impedance changes. This dynamic adaptation allows the system to optimize signal detection accuracy under varying load conditions while preventing excessive power levels that would cause interference and increase Bit Error Rate.
Solution Approach 2:
The control unit modifies the power supply voltage parameter of the amplifier based on impedance measurements. By changing this electrical parameter adaptively, the system achieves accurate demodulation when needed while avoiding the harmful effects of consistently high power levels, thus reducing interference and Bit Error Rate.
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 stabilizes message demodulation and data transmission by adapting power supply to impedance changes, reducing interference and improving Bit Error Rate (BER) in wireless power communication.
Implementation Method 1
an amplifier configured to amplify an input signal based on a power supplied to the amplifier
Implementation Method 2
The detection unit further includes a resistor, or an ON-resistance of a transistor, or a line impedance, or any combination thereof. The detection unit is further configured to detect a voltage applied to the resistor, or the ON-resistance of a transistor, or the line impedance, or any combination thereof, to detect the changed power.
Implementation Method 3
a conversion unit configured to receive an alternating current (AC) voltage, and to convert the AC voltage to the DC voltage based on a switching pulse signal
Implementation Method 4
Wireless power transmission may use resonance characteristics of radio frequency (RF) elements
Data Source
AI summary
An apparatus and method for communication using a wireless power are provided. The apparatus includes an amplifier configured to amplify an input signal based on a power supplied to the amplifier. The apparatus further includes a control unit configured to detect a change in an impedance of a target device, and to change the power based on the change in the impedance. The apparatus further includes a demodulation unit configured to receive a message from the target device, and to demodulate the message based on the changed power.