Multi-Stage Rectifier Tuning Using Intermediate Voltage Sensing
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Solution Overview
Problem
Wireless communications systems face challenges in improving signal rectification efficiency and reliability, especially in complex and dynamic environments, which can attenuate or block signals, leading to issues with power consumption, coverage area, and device connectivity.
Innovation Solution
A multi-stage rectifier system with a sample and tune circuit is employed, utilizing a chain of CMOS rectifiers to quickly sense and tune the rectifier stages based on sampled voltage, enabling faster and more accurate rectification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a multi-stage rectifier is used to improve rectification efficiency, then power conversion efficiency is improved, but device complexity increases
Solution Approach 1:
The rectifier is divided into multiple stages (first rectifier stage, second rectifier stage, third rectifier stage) where each stage performs partial rectification. This segmentation allows the system to achieve high overall rectification efficiency while maintaining manageable complexity through modular design, with each stage contributing to the cumulative power conversion efficiency.
Solution Approach 2:
The multi-stage rectifier employs a nested architecture where the output of one rectifier stage feeds into the next stage. The second rectifier stage is coupled between the first and third stages, creating a cascaded structure that efficiently multiplies the rectification effect across stages while organizing complexity in a hierarchical manner.
2Area of stationary object
If signal rectification is performed in complex and dynamic environments, then coverage area and connectivity are improved, but signal attenuation and blocking increase
Solution Approach 1:
A sample and tune circuit is implemented that samples the output voltage of the second rectifier stage and uses this feedback to dynamically adjust tuning inputs of the multi-stage rectifier. This feedback mechanism enables the system to adapt to complex and dynamic environments by continuously optimizing rectification performance despite signal attenuation and blocking, thereby maintaining coverage area and connectivity.
Solution Approach 2:
The rectifier system incorporates dynamic tuning capabilities where the sample and tune circuit continuously adjusts operating parameters based on sampled voltage. This dynamic adaptation allows the rectifier to maintain optimal performance in varying environmental conditions, overcoming signal attenuation and blocking effects that would otherwise limit coverage area.
3Speed
If the second rectifier stage is sampled for tuning, then tuning speed is improved, but measurement precision may be affected
Solution Approach 1:
The system samples the output voltage of the second rectifier stage as an intermediate measurement point before the final output stage. This preliminary sampling enables faster tuning responses by detecting voltage changes earlier in the signal chain, while the multi-stage architecture ensures that this intermediate measurement sufficiently represents the overall system state for effective tuning decisions.
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 enhances the efficiency and speed of signal rectification, allowing energy harvesting devices to operate more effectively, particularly in low-power modes, and improves the performance of wireless communications systems.
Implementation Method 1
a multi-stage rectifier comprising a first rectifier stage, a second rectifier stage, and a third rectifier stage coupled to an output of the multi-stage rectifier
Implementation Method 2
sampling a voltage at an output of the second rectifier stage
Data Source
AI summary
Certain aspects of the present disclosure are directed towards an apparatus for signal rectification. The apparatus generally includes: a multi-stage rectifier comprising a first rectifier stage, a second rectifier stage, and a third rectifier stage coupled to an output of the multi-stage rectifier, wherein the second rectifier stage is coupled between the first rectifier stage and the third rectifier stage; and a sample and tune circuit comprising a sampling input coupled to an output of the second rectifier stage and an output coupled to at least one tuning input of the multi-stage rectifier.