RF2DC Transducer Dummy Cell MPPT Tracking
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Solution Overview
Problem
Existing energy harvesting systems for wireless sensor networks and IoT applications face challenges in efficiently tracking maximum power point (MPPT) at ultra-low power levels, where the energy required for MPPT functions exceeds the energy gained, making it impractical due to high power consumption and complex circuitry.
Innovation Solution
A Radio-Frequency-to-Direct-Current (RF2DC) transducer with a dedicated terminal for open-circuit voltage measurement, using a small 'dummy' cell to replicate the main system's behavior, allowing MPPT tracking without disconnecting the energy harvester, thus reducing power absorption and circuit complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If Maximum Power Point Tracking (MPPT) functions are implemented in existing energy harvesting systems, then power transfer efficiency is improved, but power consumption by the system increases and circuit complexity increases
Solution Approach 1:
The patent implements a dummy cell that replicates the electrical behavior of the main energy harvesting cell without requiring full-scale implementation. This copy provides sufficient information for MPPT tracking while consuming significantly less power than a complete cell would require, directly resolving the contradiction between achieving efficient power tracking and minimizing power consumption.
Solution Approach 2:
The system is divided into two functional segments: the main energy harvesting cell and the dummy cell for measurement purposes. This segmentation allows the MPPT function to operate independently on a scaled-down replica, reducing the power burden on the main system while maintaining tracking accuracy.
2Measurement precision
If a dedicated terminal for open circuit voltage measurement is added to the RF2DC transducer, then measurement capability is improved, but device complexity increases
Solution Approach 1:
The dummy cell serves multiple functions simultaneously: it provides open-circuit voltage measurement, enables MPPT tracking, and replicates environmental response characteristics. This multi-functionality approach adds measurement capability without proportionally increasing complexity, as the same structural element serves several purposes.
3Measurement precision
If the energy harvester is disconnected to measure open circuit voltage, then measurement accuracy is improved, but energy flow continuity is reduced and power loss increases
Solution Approach 1:
The dummy cell acts as an intermediary measurement device that provides open-circuit voltage information without requiring disconnection of the main energy harvesting cell. This mediator enables accurate measurement while maintaining continuous energy flow through the primary system, eliminating the trade-off between measurement accuracy and energy continuity.
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 solution enables efficient MPPT tracking in ultra-low power applications with negligible power consumption, facilitating continuous energy flow and system miniaturization, while maintaining energy performance across varying environmental conditions.
Implementation Method 1
Radio-Frequency-to-Direct-Current (RF2DC) transducer with a dedicated terminal for the easy measurement of the open circuit Voltage
Data Source
AI summary
A first Radio-Frequency-to-Direct-Current (RF2DC) transducer receives a first signal from a sensing antenna and generates energy stored by an energy storage circuit. An energy transfer circuit is controllably switched between an energy storage state where energy is stored in the energy storage state and an energy transfer state where stored energy is transferred to a load. The voltage at the energy storage circuit is alternatively variable between an upper value and a lower value around a voltage setting point. A second RF2DC transducer, which is a down-scaled replica of the first RF2DC transducer, produces a second signal indicative of an open-circuit voltage of the first RF2DC transducer. The voltage setting point is set as a function of the second signal indicative of the open-circuit voltage of the first RF2DC transducer.