A Comprehensive study on RF energy harvesters: modelling, design, and implementation

Download

index.pdf

Date

2016

Author

Gharehbaghi, Kaveh

Metadata

Show full item record

Item Usage Stats

156
views

139
downloads

The Dickson and the threshold self-compensated UHF rectifier architectures are investigated in detail. At first, the Dickson architecture is studied by aiming to find an accurate yet general input-output relationship. It is revealed that the ratio of peak forward current over the load current could be well approximated for broad range of incoming RF amplitudes. For threshold self-compensated UHF rectifiers, a behavioral model is presented for core unit of the structure to ease the analytical discussions. Then, a model is elaborated by noticing the steady-state waveforms at different nodes. Then the coherence between the dependence of the load current and power conversion efficiency over the variation of the generated DC voltage is used for finding the optimum design parameters of the structure. In circuit design level, two novel architectures are introduced. The first one is threshold-compensated UHF rectifier with “self-calibration technique” which avoids the reduction of power conversion efficiency over the increment of the incoming RF signal. The idea is to separate the compensation-generator from the main rectifier by adding two auxiliary rectifiers. Second circuit for UHF rectifiers is “switched-gate” architecture which increases the peak power conversion efficiency. The method is based on adaptive threshold-compensation which establish different gate-source voltage for the diodes during the forward and reverse conduction phases. Analysis of conjugate matching and passive Q-boosting methods for interfacing between antenna and rectifier is also conducted. At the end, a novel reference block is designed by reducing the power consumption of the voltage reference down to 89 nW while providing temperature/supply independent reference.

Subject Keywords

Electric power supplies to apparatus., Electric current converters., Electric current rectifiers., Antennas (Electronics)., Radio frequency.

URI

http://etd.lib.metu.edu.tr/upload/12620388/index.pdf
https://hdl.handle.net/11511/26108

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

A Comparative Study of Capacitive and Inductive Pulsed Power Supply Topologies for Electromagnetic Launcher Applications Ceylan, Doga; Pourkeivannour, Siamak; Keysan, Ozan (2019-01-01) Inductive and capacitive types are the most common pulsed power supply (PPS) topologies. In this paper, the comparison of inductive XRAM generator and capacitor-based (C-based) generator topologies is discussed for the excitation of an electromagnetic launcher (EML). In addition, the effect of capacitance or inductance of the storage element on the load current and laucher efficiency is investigated. The circuit simulation results of these PPS topologies are presented, each of which having 200 kJ PPS energy...
Adaptive control of DC link current in current source converter based STATCOM for improving its power losses Karaduman, Ferdi; Ermiş, Muammer; Bilgin, Hazım Faruk; Department of Electrical and Electronics Engineering (2012) In conventional three-phase PWM (Pulse Width Modulation) current source converter based STATCOM (Static Synchronous Compensator) applications, DC link current is kept constant at a predefined value and the reactive power of STATCOM is controlled by varying modulation index. This control strategy causes unnecessary power losses especially when the reactive power of STATCOM is low. For this purpose, in order to reduce the active power drawn by STATCOM, the modulation index can be maximized by adjusting DC lin...
A High Performance PWM Algorithm for Common Mode Voltage Reduction in Three-phase Voltage Source Inverters Uen, Emre; Hava, Ahmet Masum (2008-06-19) A high performance PWM algorithm with reduced common mode voltage (CMV) and satisfactory overall performance is proposed for three-phase PWM inverter drives. The algorithm combines the near state PWM (NSPWM) method which has superior overall performance characteristics at high modulation index and MAZSPWM, a modified form of the active zero state PWM method (AZSPWM1), which is suitable for low modulation index range of operation. Since AZSPWM1 has line-to-line voltage pulse reversals with small zero-voltage...
Optimizing transient and filtering performance of a C-type 2nd harmonic power filter by the use of solid-state switches Gerçek, Cem Özgür; Ertaş, Arif; Department of Electrical and Electronics Engineering (2007) In this research work, the performance of a C-type, 2nd harmonic power filter is optimized by the use of a thyristor switched damping resistor. In the design of conventional C-type, 2nd harmonic filters; the resistance of permanently connected damping resistor is to be optimized for minimization of voltage stresses on filter elements arising from switchings in transient state and for maximization of filtering effectiveness in the steady-state. Transformer inrush current during energization of power transfor...
The Design of a high frequency pulse width modulation integrated circuit with external synchronization capability Şahin, Osman Ulaş; Koçer, Fatih; Department of Electrical and Electronics Engineering (2017) The Pulse Width Modulation (PWM) has been playing an active role in circuits and systems for many years. The PWM is an irreplaceable part of the switch-mode power supplies (SMPS) and the class D power amplifiers (PA). The high frequency PWM operation is the key for having more compact SMPSs and class D PAs since it provides size reduction of the passive components, which dominates the size and the cost of these circuits. The digital implementation of the high frequency PWM inherently suffers from the lack o...

Citation Formats

K. Gharehbaghi, “A Comprehensive study on RF energy harvesters: modelling, design, and implementation,” Ph.D. - Doctoral Program, Middle East Technical University, 2016.