Wireless Energy Collection Circuit with Dynamic Impedance Matching
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Solution Overview
Problem
Wireless electronic devices face challenges in generating sufficient DC power due to insufficient received electric power, especially when located far from transmitters, and limited electromagnetic wave energy, leading to inefficient energy collection and conversion.
Innovation Solution
An apparatus with an antenna and a collection circuit that generates AC voltage from radio waves, includes a rectifier, impedance transformer, detector, and controller to adjust internal impedance for optimal power conversion efficiency, using a differential rectifier for higher efficiency at low power levels and impedance matching to maximize energy collection from both specific and skywave frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a wireless electronic device collects energy from a specific frequency transmitter, then the device can generate DC power, but the received electric power is insufficient when the device is located far away from the transmitter
Solution Approach 1:
The wireless electronic device is designed to collect electromagnetic energy from multiple frequency sources simultaneously - both specific frequency transmitters and skywave frequencies. This multi-functionality allows the device to operate effectively whether near a transmitter or far away by diversifying its energy collection sources.
Solution Approach 2:
The device dynamically adjusts its impedance parameters to optimize energy collection efficiency. By changing impedance values based on received signal conditions, the device maximizes power transfer from available electromagnetic fields regardless of distance or frequency source.
2Adaptability or versatility
If a wireless electronic device collects energy from electromagnetic skywave frequency, then the device can receive electric power irrespective of position, but the amount of received electric power is not sufficient due to limited electromagnetic wave energy
Solution Approach 1:
The device merges energy collection from two different frequency sources - specific frequency transmitters and skywave frequencies - into a unified power generation system. This combination allows the device to maintain position independence while increasing total received power by aggregating energy from multiple sources.
Solution Approach 2:
The dual-frequency collection capability enables the device to function effectively in diverse environmental conditions and locations, maintaining versatility while overcoming the limitation of insufficient power from single skywave collection.
3Device complexity
If the internal impedance of the collection circuit is fixed, then the circuit structure is simple, but the power conversion efficiency is reduced when impedance mismatch occurs
Solution Approach 1:
The collection circuit employs dynamically adjustable impedance elements that can change their values in response to operating conditions. This dynamic impedance adjustment optimizes power transfer efficiency across varying input conditions without requiring a completely complex circuit architecture.
Solution Approach 2:
The circuit modifies its impedance parameters adaptively to match source impedance under different operating conditions. This parameter adjustment minimizes reflections and maximizes power transfer efficiency while maintaining relatively simple circuit implementation.
4Ease of manufacture
If a standard rectifier is used for power conversion, then the device is simple to manufacture, but the conversion efficiency is insufficient at low AC power levels
Solution Approach 1:
The rectifier circuit employs variable operating parameters and impedance values that are optimized for low-power operation. By adjusting these parameters, the rectifier achieves high conversion efficiency at low AC power levels while maintaining manufacturability through standard component implementations.
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 apparatus efficiently collects wireless energy, generating relatively high DC power by ensuring optimal impedance matching and energy conversion efficiency, even when devices are far from transmitters or receive low electromagnetic wave energy, thereby enhancing power generation and collection capabilities.
Implementation Method 1
an antenna which generates an alternating current (AC) voltage from a radio wave
Implementation Method 2
a rectifier which outputs the DC voltage by rectifying the AC voltage
Data Source
AI summary
An apparatus for collecting wireless is provided. The apparatus includes an antenna and a collection circuit. The antenna generates an alternating current (AC) voltage from a radio wave. The collection circuit generates a direct current (DC) voltage corresponding to the AC voltage, determines whether the DC voltage is lower than a preset value, and changes an internal impedance of the collection circuit if it is determined that the DC voltage is lower than the preset voltage.