Power Conversion Efficiency Of Rectifier Research Articles

Dualband rectenna for RF energy harvesting using metamaterial reflect array and novel matching technique

Harvesting energy from multiple sources, antenna gain, rectifier power conversion efficiency, and rectenna size are essential properties to consider while designing an antenna for ambient energy harvesting. This paper represents two high-gain, dualband antennas using a metamaterial Artificial Magnetic Conductor array. Both antennas are designed to harvest energy from GSM-1800, and the 2.45 GHz Industrial, Scientific, and Medical (ISM) frequency bands. The first antenna achieves a gain of 6.85 dB and 6.57 dB at 1.8 GHz and 2.45 GHz, respectively. The second configuration shows a gain of 7.11 dB at 1.8 GHz and 6.79 dB at 2.45 GHz. The antennas are circularly polarized at 2.45 GHZ.A dualband rectifier is designed based on a novel matching procedure to complete the energy harvesting system. The measured peak conversion efficiency is 72 % at 1.8GHz and 65 % at 2.45GHz with an area of 33 ×55 mm2.

Design of high efficiency energy harvesting circuit using dual switching technique

Energy harvesting technique has been popularly used as a powering methodology for various low power applications like wireless sensor nodes, wearable and implantable devices. This paper mainly focuses novel rectifier design to enhance the performance of energy harvesting circuit. The sound signals produced from smartphone or loud speaker are the main input source for the energy harvesting circuit consisting of transducer, rectifier, regulator. The existing active diodes of rectifier are replaced with dual switching technique. This technique maintains constant gate bias, reduces reverse leakage current and area and increases the power conversion efficiency of rectifier. The proposed rectifier yields maximum power conversion efficiency (PCE) of 85% with an input voltage of 800mv. The energy harvesting circuit has been designed and simulated within CMOS standards.

Quad-Band Rectenna for RF Energy Harvesting System

The design of multiband microstrip rectenna for radio frequency energy harvesting applications is presented in this paper. The designed antenna has good performance in the GSM-900/1800, WiFi and WLAN bands. In addition, the rectifier circuit is designed at multi resonant frequencies to collect the largest amount of RF ambient power from different RF sources. The developed antenna is matched with the rectifier at four desired frequencies using several rectifier branches to collect the largest of RF power. The proposed rectenna is printed on FR4 substrate with modified ground plane to achieve suitable impedance bandwidth. The proposed antenna consists of elliptical radiating plane with stubs and stepped modified ground plane. The rectenna resonates at quad frequency bands at (GSM 900/1800, WiFi band and WLAN bands) with rectifier power conversion efficiency up to 56.4% at 0 dBm input power using the HSMS-2850 Schottky diode. The efficiency is more enhanced by using SMS-7630-061 Schottky diode which is characterized by a low junction capacitance and a low threshold voltage to achieve higher conversion efficiency up to 71.1% at the same 0 dBm input power for the same resonating frequency band.

Self-Biased Differential Rectifier With Enhanced Dynamic Range for Wireless Powering

A self-biased cross-coupled differential rectifier is proposed with enhanced power-conversion efficiency (PCE) over an extended range of input power. A prototype is designed for ultrahigh-frequency (UHF) 433-MHz radio-frequency power-harvesting applications and is implemented using a 0.18- $\mu\text{m}$ CMOS technology. The proposed rectifier architecture is compared with the conventional cross-coupled rectifier. It demonstrates an improvement of more than 40% in the rectifier PCE and an input power range extension of more than 50% relative to the conventional cross-coupled rectifier. A sensitivity of −15.2-dBm (30- $\mu\text{W}$ ) input power for 1-V output voltage and a peak PCE of 65% are achieved for a 50- $\text{k}\Omega$ load.