Adaptive RF Power Transponder for Battery-less Operation
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Solution Overview
Problem
Existing wireless powering technologies for battery-less devices, such as RFID tags, face challenges in efficiently providing consistent and sufficient RF energy due to power and energy consumption constraints, limiting their operational capabilities and effectiveness.
Innovation Solution
A system where a reader device transmits RF power signals with varying pulse duration and power levels to adapt to the availability of collectable energy, allowing transponder devices to optimize their functions based on the received power, using resonating circuitry and charge storage to harvest energy for powering processing capabilities and sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If RF power signals are transmitted to battery-less devices, then the devices can operate without batteries, but the power and energy consumption at the reader device becomes excessive
Solution Approach 1:
The reader device transmits RF power signals in periodic pulses rather than continuously. The pulse duration, repetition frequency, and duty cycle are optimized to provide sufficient energy to transponders only when needed, dramatically reducing average power consumption while maintaining battery-less operation capability
Solution Approach 2:
The system dynamically adjusts RF transmission parameters (power level, pulse duration, repetition rate) based on real-time conditions such as transponder presence, distance, and energy harvesting efficiency. This adaptive approach ensures minimum necessary energy transmission while maintaining device functionality
2Reliability
If continuous RF power transmission is used to ensure sufficient energy supply, then transponder devices can maintain consistent operation, but energy waste increases
Solution Approach 1:
The system incorporates feedback mechanisms where transponders report their energy harvesting status and operational needs to the reader. The reader uses this feedback to intelligently control RF transmission timing and power levels, ensuring energy is transmitted only when transponders are present and can effectively harvest it, eliminating waste while maintaining reliable operation
3Use of energy by moving object
If pulse duration is extended to provide more collectable energy, then transponder energy harvesting improves, but reader device power consumption increases
Solution Approach 1:
The system uses periodic pulsed RF transmission with optimized pulse durations that provide sufficient energy for transponder operations. By spacing pulses appropriately and using duty cycles adapted to transponder energy storage capacity, the system maximizes harvested energy per pulse while minimizing average reader power consumption through间歇式 operation
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
Enables flexible and efficient operation of battery-less devices by tailoring their functions to the available RF energy, reducing power consumption and extending operational capabilities while conserving energy at the reader device.
Implementation Method 1
processing circuits of such a battery-less device may be powered, at least in part, by radio frequency (RF) energy, light energy or acoustical energy transmitted by devices in a close proximity and collected at the battery-less device
Implementation Method 2
using resonating circuitry and charge storage to harvest energy for powering processing capabilities and sensors
Data Source
AI summary
Disclosed are methods, systems and devices for varying operations of a transponder device based, at least in part, on an availability of energy and/or power that may be harvested and/or collected. In one particular implementation, operations to generate one or more signals from sensor circuitry and/or to perform computations may be varied based, at least in part, on an availability of harvestable and/or collectable energy and/or power.