Showing papers on "Precision rectifier published in 2022"
TL;DR: This work designed a single band rectifier and converted it into a dual- and triple-band rectifier by introducing an appropriate transmission line and shorted stub, respectively, to convert simultaneously multiple RF signals into dc.
Abstract: Rectifier is a fundamental element of a rectenna system that converts RF energy to direct current (dc). We proposed a triple-band rectifier using a novel matching technique and single series diode topology. First, we designed a single band rectifier and then converted it into a dual- and triple-band rectifier by introducing an appropriate transmission line and shorted stub, respectively, to convert simultaneously multiple RF signals into dc. The proposed rectifier operates at the popular frequency bands of 1.95, 2.7, and 5.8 GHz with power conversion efficiency (PCE) of 65.5%, 62%, and 57.1%, respectively, using a single impedance matching circuit.
19 citations
TL;DR: In this article , a single-stage rectifier-less boost converter circuit (SSRBC) for piezoelectric energy harvesting from ambient vibration was proposed, which combined the conventional boost, buck-boost methods using two split inductors and single filter capacitor.
Abstract: In this paper, a single-stage rectifier-less boost converter circuit (SSRBC) for piezoelectric energy harvesting from ambient vibration was proposed. The proposed rectifier-less circuit acted as a boost converter to extract energy from a piezoelectric device (PD). It combined the conventional boost, buck-boost methods using two split inductors and single filter capacitor. The proposed integrated circuit topology functioned in both positive and negative half cycles generated by the PD. In the proposed topology, inductors were invigorated by being enveloped with the current, which was produced by the PD through the switches. This facilitated active rectification of ultra-low AC (amplitude < 0.5 V P ). Theoretical analysis, control strategies, simulation and experimental study were presented. The proposed circuit was capable of converting a low amplitude AC voltage of 0.5 V P into 5.1 V dc . The highest output power extracted by the proposed circuit was 281.1 μW, which outperformed existing circuits. It could potentially facilitate the advancement of vibration-based energy harvesting systems for low power demand applications such as sensors, quartz watches and portable charging devices.
12 citations
TL;DR: In this paper , the authors investigated the latest research outcomes on the wide power dynamic range (PDR) CMOS RF-DC rectifier for on-chip radio frequency energy harvesting (RFEH) system as a viable approach to extend the high power conversion efficiency (PCE) operating range which is limited by the varying nature of the available far-field RF power.
Abstract: This article investigates the latest research outcomes on the wide power dynamic range (PDR) CMOS RF-DC rectifier for on-chip radio frequency energy harvesting (RFEH) system as a viable approach to extend the high power conversion efficiency (PCE) operating range which is limited by the varying nature of the available far-field RF power. The significance of enhancing the rectifier’s PDR is that it offers a more reliable operation of RFEH in real-life applications. Therefore, this review seeks to navigate the research and development focus of the RFEH system towards extending the PDR of the CMOS RF-DC rectifier by providing analysis of the effect of state-of-the-art PDR extension techniques and their design tradeoffs. The review encapsulates the transmission of the RF power, a brief overview of the RFEH front-end circuit, and a comprehensive review of the CMOS rectifier design focusing on PDR. At the end of this article, we discuss the future design aspects to address the limitation of the RFEH system. Recent research shows that extending the rectifier’s PDR will enhance the overall performance of the RFEH system.
11 citations
TL;DR: In this article , the authors proposed a three-phase hybrid rectifier topology and control method for high power electrolytic hydrogen production application, which is composed of a primary rectifier, i.e., a six-pulse silicon controlled rectifier (SCR) and an auxiliary converter, including a pulsewidth modulation (PWM) voltage source converter and a phase-shift full-bridge converter.
Abstract: This letter proposes a novel three-phase hybrid rectifier topology and control method for high power electrolytic hydrogen production application. It is composed of a primary rectifier, i.e., a six-pulse silicon controlled rectifier (SCR) and an auxiliary converter, including a pulsewidth modulation (PWM) voltage source converter and a phase-shift-full-bridge converter. SCR undertakes most of the power consumed by electrolysis cell, and the auxiliary converter can compensate dc current ripples and absorb ac current harmonics of primary rectifier simultaneously. Compared with high power PWM rectifier, the proposed hybrid rectifier can keep the main benefits of PWM rectifier, such as the low dc current ripple to realize improved efficiency of electrolytic hydrogen production and high grid current quality at ac side while significantly reducing the cost. The effectiveness of the proposed hybrid rectifier is verified by the simulation as well as experimental results.
10 citations
TL;DR: In this article , a broadband RF rectifier is proposed and tested for ambient RF energy harvesting (EH) and an uncomplicated impedance matching network with multistage transmission lines (quasi T-shaped) is presented.
Abstract: In this letter, a compact broadband RF rectifier is proposed and tested for ambient RF energy harvesting (EH). An uncomplicated impedance matching network with multistage transmission lines (quasi T-shaped) is presented. Quasi T-shaped network performs three different functions to complete the broadband matching process. The novel matching network widens working bandwidth using fewer transmission lines without via hole so that it has low loss and high conversion efficiency. After theoretical analysis and simulation, the rectifier is manufactured, and the measured results are consistent with the simulation results. The rectifier shows good broadband performance. The frequency range of rectifier efficiency over 50% is from 0.85 to 2.05 GHz (a bandwidth of 82.7%) at 5 dBm. The rectifier shows a bandwidth of 101.5% (0.8–2.45 GHz) with a power conversion efficiency (PEC) greater than 50% for an 8 dBm input power. In addition, the maximum conversion efficiency of the circuit is as high as 73.1% at the input power of 8 dBm.
7 citations
01 Mar 2022
TL;DR: In this article , the authors proposed a 20-pulse rectifier for the ac-dc MEA power system based on a low-rating autotransformer (LRA), and a passive harmonic reduction circuit (PHRC) was used on the dc side of the 20pulse Rectifier to suppress the harmonics up to the 40th order according to DO-160G.
Abstract: From a theoretical and practical point of view, to increase rating and decrease the cost and complexity of a multi-pulse rectifier (MPR), its pulse number has to be increased. In many industrial applications, a 20-pulse rectifier is suggested as the practical solution considering its simple structure and low weight. But the 20-pulse rectifiers, suggested in different studies, must use filters to satisfy the DO-160G requirements for 21st and 39th harmonics for ac–dc more electric aircraft (MEA) power systems. To overcome this problem, this article proposes a novel 20-pulse rectifier for the ac–dc MEA power system based on a low-rating autotransformer (LRA). Also, a passive harmonic reduction circuit (PHRC) is used on the dc side of the 20-pulse rectifier to suppress the harmonics up to the 40th order according to DO-160G without using any filter. In this article, simulations are provided to show the merits of this new rectifier over other proposed solutions. Then, an experimental prototype is implemented for evaluating and verifying the simulation results. By investigating the captured outcomes, this article concludes that the introduced design is practical and can simultaneously consider the trade-off among autotransformer structure, pulse number, complexity, rating, and cost.
6 citations
TL;DR: This paper reviews and analyses the design of popular radio frequency energy harvesting systems and proposes a method to qualitatively and quantitatively analyze their circuit architectures using new square-wave approximation method, which will help in simplifying design analysis.
Abstract: This paper reviews and analyses the design of popular radio frequency energy harvesting systems and proposes a method to qualitatively and quantitatively analyze their circuit architectures using new square-wave approximation method. This approach helps in simplifying design analysis. Using this analysis, we can establish no load output voltage characteristics, upper limit on rectifier efficiency, and maximum power characteristics of a rectifier. This paper will help guide the design of RF energy harvesting rectifier circuits for radio frequency identification (RFIDs), the Internet of Things (IoTs), wearable, and implantable medical device applications. Different application scenarios are explained in the context of design challenges, and corresponding design considerations are discussed in order to evaluate their performance. The pros and cons of different rectifier topologies are also investigated. In addition to presenting the popular rectifier topologies, new measurement results of these energy harvester topologies, fabricated in 65nm, 130nm and 180nm CMOS technologies are also presented.
5 citations
TL;DR: In this paper , a high-input power (>30 dBm) rectifier circuit for 2.45 GHz microwave wireless power transmission is presented, which is designed based on a GaAs field effect transistor (FET) and a Schottky diode together as the rectification part.
Abstract: In this article, a high-input power (>30 dBm) rectifier circuit for 2.45-GHz microwave wireless power transmission is presented. To overcome the shortcomings of the traditional Schottky rectifier circuit, the novel rectifier circuit is designed based on a GaAs field-effect transistor (FET) and a Schottky diode together as the rectification part. A system-level verification demonstrates that the novel rectifier circuit has a potential application value for microwave wireless power transmission system. Measurement results show that higher input power range and MW-dc power conversion efficiency are realized at the same time by this design scheme. The maximum MW-dc conversion efficiency of the novel rectifier circuit can reach 74.42% when the input power is 30 dBm, and it is 20% higher than the peak conversion efficiency of the traditional rectifier without FET. In addition, the proposed rectifier circuit can operate with over 50% efficiency when the input power varies from 16 to 31 dBm, and has a good performance with the value of load ranging from 70 to 730 Ω, it is mean that the novel rectifier circuit is able to provide power for some electronic devices with different impedance.
5 citations
TL;DR: In this paper , a broadband rectifier based on Schottky diode SMS7630 was proposed to improve the operating bandwidth of the rectifier by using the harmonic components generated by the diode for rectifying.
Abstract: With the rapid and extensive development of wireless communication and low power electronics, electromagnetic wireless power harvesting (WPH) draws more and more attention. As the core component for RF-to-DC power conversion, its characteristics determine the performance of the overall WPH system. To obtain as much dc energy as possible, ambient electromagnetic energy with various frequencies should be efficiently rectified. Therefore, it is important to widen the operating bandwidth of the rectifier. According to the theoretical analysis of the Schottky diode, it can be found that if the harmonic components generated by the diode can be fed back through a specific approach for rectifying, the bandwidth of the rectifier will be effectively improved. Therefore, a broadband rectifier has been proposed based on the previous principle. For validation, a wideband rectifier based on Schottky diode SMS7630 had been designed, fabricated and measured. When the input power level is 0 dBm, the conversion efficiency of the implemented rectifier is larger than 40% from 0.4 to 2.6 GHz within a relative bandwidth of 146.67%, exhibiting an ultrawide bandwidth compared with existing state-of-the-art configurations.
4 citations
TL;DR: In this article , two identical sub-rectifiers replace the two load circuits of the conventional rat-race coupler (RRC) topology with a smaller variation in power conversion efficiency (PCE) over the incident angle.
Abstract: This article presents a radio frequency (RF) rectifier with a wide incident angle of incoming waves, based on a rat-race coupler (RRC). Two identical sub-rectifiers replace the two load circuits of the conventional RRC. When compared with the previous Wilkinson power combiner (WPC)-based rectifier, the proposed topology advances with a smaller variation in power conversion efficiency (PCE) over the incident angle. In addition, it simplifies the matching network (MN) design and enables a lower input return loss due to the fully symmetric circuitry between 0° and 180°. Furthermore, it allows a higher design flexibility on the rectifier topology. For validation, we designed and fabricated two wide-angle rectifiers, one working at single band (2.45 GHz) and the other at dual band (0.9 and 2.4 GHz). The single-band rectifier achieved a 67.3% peak PCE and 7.9% efficiency variation within the 0°–360° incident angle range. For the dual-band rectifier, the peak PCE is 78.4% and 70.2%, while the variation is 4% and 8.8%, for 0.9 and 2.4 GHz, respectively. The PCE variation is the smallest among previous works.
4 citations
08 Jun 2022
TL;DR: A rectifier circuit for RF to DC conversion suitable for operation at sub-6 GHz 5G bands and found to be highly efficient in its current form.
Abstract: The need for electronic devices usage has risen significantly over the years. This has in turn generated greater demands for electricity and in addition for green energy sources. These include Radio-Frequency (RF) energy harvesting. In this concept we design a rectifier circuit for RF to DC conversion suitable for operation at sub-6 GHz 5G bands. Such a circuit can be used to supply low-power electronic devices. The proposed rectifier works at the frequency band FR1 of 5G cellular network and more specifically at 3.5 GHz. The most important problem in the RF energy harvesters is low system efficiency, something that limits the popularity of the power harvest. The proposed design is found to be highly efficient in its current form. Numerical results show that the system in a single-tone signal provides maximum power conversion efficiency equal to 42.5% when the load of the circuit is 1.1 KΩ and the input power reaches 9 dBm. The presented rectifier circuit performs better or equally with similar designs in the literature.
TL;DR: Considering the weakness of the conventional physical model of power diodes in the rectifier design, an improved lumped-charge model is presented in this paper to achieve both high accuracy and high efficiency in the simulation of power electronic equipment.
Abstract: Considering the weakness of the conventional physical model of power diodes in the rectifier design, an improved lumped-charge model is presented in this article to achieve both high accuracy and high efficiency in the simulation of power electronic equipment. To improve the convergence of the physical model simulation in the rectifier circuit, the transmission-line theory is implemented in the model. Furthermore, a dynamic partition method is implemented in the model to achieve high accuracy of the transient characteristics of the diode during the level transition of the rectifier, with reducing the number of numerical solutions through reallocation of computing resources. Compared with the conventional model, the simulation error is decreased. This successfully adopts the physical model to realize both equipment-level simulation and high accuracy of device simulation in the design of the rectifier and $RC$ snubber circuit. The experimental results show that the error of the proposed model is less than 10% and 5% the minimum, which is a maximum 30% decreasing compared with that of the conventional model. The half-cycle ( $500~{\mu \text {s}}$ ) simulation of the rectifier circuit with 10 and 20 power diodes cost 18 and 33 s.
TL;DR: In this paper , a three-phase diode rectifier, a buck converter, and an instantaneous reactive power compensator (IRPC) were used to reduce the current ripple.
Abstract: This article discussesthe control method for an ac/dc rectifier system consisting of a three-phase diode rectifier, a buck converter, and an instantaneous reactive power compensator (IRPC). The IRPC makes the grid current sinusoidal by controlling only the instantaneous reactive power. Thus, it is possible to reduce the size of the dc capacitors and ac inductors. This article analyzes the overlap in the rectifier, derives the suitable gain in the damping control, and proposes a modified control method for the IRPC to reduce the current ripple. A 4.5-kW laboratory setup was assembled and examined to verify the theory developed in this article. As a result, the modified control method effectively suppresses the spike current around the overlap duration and damps the overshoot/ringing caused by the resonance. The proposed ac/dc rectifier exhibits an improved power conversion efficiency of 98.2%.
05 Jul 2022
TL;DR: In this paper , a synchronous rectification without transfer side signals was applied to a magnetic-field WPT system with a series-series topology, where the secondary resonant capacitor voltage was 90 degrees forward from the rectifier input voltage, and the conversion efficiency of the proposed synchronous system from dc to dc was 91.8% achieved at 85-kHz 3kW output power and 1.6pt higher than the diode rectifier method.
Abstract: A wireless power transfer (WPT) system has been considered to be applied to various charging applications. Conversion efficiency is one of the important factors and is in need of improvement in various approaches. This paper proposes a WPT system consisted of a synchronous rectification without transfer side signals. The proposed rectifier is applied to a magnetic-field WPT system with a series-series topology. This system is characterized by the use of the voltage sensor at the secondary resonant capacitor to achieve the synchronous rectification. The theoretical analysis concludes by the secondary resonant capacitor voltage being 90 degrees forward from the rectifier input voltage. A synchronous rectifier is designed, constructed, and tested to verify the principles of operation. The conversion efficiency of the proposed synchronous system from dc to dc is 91.8% achieved at 85-kHz 3-kW output power and 1. 6pt higher than the diode rectifier method. The efficiency distribution results from the loss of the synchronous rectifier is 53.2 W lower than that of the diode rectifier.
TL;DR: In this article , the reverse DC feeding (RDCF) self-body-biasing technique is proposed for allowing both NMOS and PMOS transistors in the rectifier to operate with a scalable threshold voltage.
Abstract: A CMOS rectifier is presented for the far-field RF energy harvesting (RFEH) system based on the differential-drive cross-coupled bridge (DDCCB) structure. A novel body-biasing technique known as the reverse DC feeding (RDCF) self-body-biasing technique is proposed for allowing both NMOS and PMOS transistors in the rectifier to operate with a scalable threshold voltage. As such, the RDCF technique enables the rectifier to operate with adaptive efficiency leading to better system performance. The performance of the proposed structure has been verified through simulation using a triple-well 130 nm CMOS technology and analyzed with the conventional source-to-body and the lower DC feeding (LDCF) technique at the operation frequency of 953 MHz along with a corresponding load of 2 kΩ, 10 kΩ, and 50 kΩ. Compared with other published works, the proposed DDCCB rectifier with the RDCF technique has an improved peak PCE of 72.2 % at the frequency of 953 MHz when driving a 10 kΩ load. The RDCF technique also has the capability of self-limiting output DC voltage which is crucial when the rectifier operates at a short communication range. A limit-voltage level of 4.2 V is obtained irrespective of the load to protect the other subsequent circuit driven by the rectifier.
01 Sep 2022
TL;DR: In this article , a single-phase Vienna rectifier with two power switches and two diodes is proposed to make the output voltage to be controlled more flexible, which has a wider output voltage regulation range and a lower output voltage ripple amplitude.
Abstract: The conventional single-phase Vienna rectifier has been applied in EV chargers with the advantages of a small inductor and high efficiency. However, it has a narrow output voltage regulation range and a large output voltage ripple amplitude. To resolve the above problems, a novel single-phase Vienna rectifier is proposed. The proposed rectifier adds two power switches and two diodes, which makes the output voltage to be controlled more flexible. By the relationship between the input voltage and the output voltage, the proposed rectifier divides three operation modes with the two-modulation strategy. As a result, it has a wider output voltage regulation range and a lower output voltage ripple amplitude. The theories of the topology and the modulation strategy of the proposed rectifier are explained in detail. The mathematical model is deduced and built up. The control strategy is analyzed and provided. The simulations and experiments are carried out to validate the advantages of the proposed rectifier.
05 Jul 2022
TL;DR: In this article , a single-shunt rectifier is proposed, and a 1 GHz broadband rectifier was designed, fabricated, and evaluated, and the frequency response was measured using a DC load resistance of 200 ohm determined by the input/output characteristics.
Abstract: In this study, a single-shunt rectifier is proposed, and a 1-GHz broadband rectifier is designed, fabricated, and evaluated. A rectifier is a device used to convert microwaves into DC current for data transmission and reception. First, it was confirmed that the wideband rectifier fabricated using microstrip lines can be matched around 1 GHz. The load resistance was then varied, and the input-output characteristics determined the DC load resistance to be 200 ohm. Next, the frequency response was measured using a DC load resistance of 200 ohm determined by the input/output characteristics. Finally, we calculated the EBW value (bandwidth vs. median bandwidth) using the band above 50% as the frequency band, and achieved 71%.
TL;DR: In this paper , a reconfigurable hybrid radio frequency rectifier is proposed to efficiently convert AC RF power to DC voltages for an energy harvesting system, which adopts the advantage of low conduction loss in the switch-connected rectifier and low reverse current loss in diode-connection rectifier topology to enhance its power conversion efficiency.
Abstract: This paper presents a reconfigurable hybrid Radio Frequency (RF) rectifier designed to efficiently convert AC RF power to DC voltages for an energy harvesting system. The proposed reconfigurable rectifier adopts the advantage of low conduction loss in the switch-connected rectifier and low reverse current loss in the diode-connection rectifier topology to enhance its power conversion efficiency (PCE). Capable of reconfiguring into different rectifier topologies, the proposed circuit can reconfigure into a switch-based cross-coupling differential drive (CCDD) at low input power and a diode-based hybrid rectifier at higher input power for a wide dynamic range operation. Designed and implemented on a CMOS 65 nm technology, the post-layout result records a peak PCE of 88.7% and a wide PCE dynamic range (PDR) of 16 dBm for PCE >40%. The proposed circuit also demonstrates a −21 dBm sensitivity output across a 1 MΩ output load.
TL;DR: In this article , a simple 24-pulse rectifier that provides low-harmonic utility power interface is proposed, which consists of a 12-pin rectifier using a zigzag phase-shifting transformer and an auxiliary pulse-doubling circuit (APDC).
Abstract: A simple 24-pulse rectifier that provides low-harmonic utility power interface is proposed in this article. The proposed 24-pulse rectifier consists of a 12-pulse rectifier using a zigzag phase-shifting transformer and an auxiliary pulse-doubling circuit (APDC). Two auxiliary diodes in the APDC extract specific rectangular currents from the dc side of the rectifier to modulate and increase the output states of three-phase rectification bridges first, and then the 12-pulse rectifier is extended to a 24-pulse rectifier in accordance with the current relationship between ac and dc sides. The main low-order harmonics, such as 11th and 13th, are reduced markedly from the input line current and the proposed rectifier draws near-sinusoidal input line currents with less than 5% THD from the utility. The maximum current flowing through the two auxiliary diodes in APDC is only 3.4% of the load current and the capacity of APDC is only 3.06% of the output power. Thus, the proposed scheme is inexpensive and easy to implement and has a simple circuit configuration. Theoretical analyses were experimentally verified using a 1.7-kW experimental prototype.
TL;DR: In this paper , a fabricated 5.8 GHz charge pump rectifier achieved an RF-dc conversion efficiency of 70.8% at an input power of 8.0 W and a load resistance of 2.9% at the maximum input power.
Abstract: This study theoretically and experimentally indicates that a charge pump rectifier for low-power rectifiers such as RF-ID can be applied to high-power rectifiers and can attain the same level of RF-dc conversion efficiency and twice as high power rectification as the single-shunt rectifiers. A high-power rectifier is primarily a single-shunt rectifier, and a charge pump rectifier that applies twice the output voltage is used in low-power applications such as RF-ID. We aim to enhance the power of charge pump rectifiers by focusing on their characteristics. A fabricated 5.8 GHz charge pump rectifier achieved an RF-dc conversion efficiency of 70.8% at an input power of 8.0 W and a load resistance of $150\,\Omega$
TL;DR: In this article , a high-efficiency rectifier based on a transmission-line transformer with wide input power and frequency ranges is presented, where the rectifier was configured with a voltage multiplier and transmission lines connected to each diode.
Abstract: In this paper, a high-efficiency rectifier based on a transmission-line transformer with wide input power and frequency ranges is presented. The proposed rectifier was configured with a voltage multiplier and transmission lines connected to each diode. Both the connected transmission lines were coupled and configured in the form of a transformer for a high Q-factor and low insertion loss. Further, the rectifier was optimized to match the source impedance for wide input power and frequency ranges. The size of the proposed rectifier was 34.4 mm × 12.8 mm, and its performance was verified through measurements. The proposed rectifier exhibited a high power conversion efficiency of over 70% in a wide frequency band of 2.0 GHz–2.8 GHz. The rectifier exhibited a power conversion efficiency of 50% or more in the power range of 4.6 dBm–22.8 dBm at a center frequency of 2.45 GHz.
TL;DR: In this paper , a rectifier circuit based on a tuned matching circuit is demonstrated for RF energy harvesting applications, which is suitable for selecting a wide range of operating frequency bands, realized by changing the value of the inductor in the matching network.
Abstract: RF energy harvesting (RFEH) is an emerging technique in the field of wireless technology. The key components of this system are receiving antenna, matching network, and rectifier circuit. A rectifier circuit based on a tuned matching circuit is demonstrated in this paper for RFEH applications. The topology of this rectifier circuit is suitable for selecting a wide range of operating frequency bands, realized by changing the value of the inductor in the matching network. For validation purpose, a rectifier has been designed, developed, and tested at 2.45 GHz. The rectifier achieved peak power conversion efficiency (PCE) of 64.5% at 0 dBm. The PCE is higher than 50% for input power in the range of −8.5–2 dBm. The proposed rectifier has a compact size of 20 × 15 × 1.524 mm3. By changing the value of the inductor in the matching network this rectifier can be redesigned for any other operating frequency in the range of 0.6–2.6 GHz.
05 Jul 2022
TL;DR: In this paper , the authors proposed a novel rectenna that can estimate the received power level by using the second-harmonic power generated by the rectenna, and the proposed rectenna consists of two rectifier circuits for fundamental waves, a branch line coupler (BLC), a dual-band pass filter (DBPF), and a rectifier circuit for secondharmonic waves.
Abstract: This paper proposes a novel rectenna that can estimate the received power level by using the second-harmonic power generated by the rectenna. The proposed rectenna consists of two rectifier circuits for fundamental waves (main rectifier circuits), a branch line coupler (BLC), a dual-band pass filter (DBPF), and a rectifier circuit for second-harmonic waves (feedback rectifier circuit). The feedback rectifier circuit rectifies the second harmonic wave extracted by BLC and DBPF, and the second harmonic power level is read as the rectified dc voltage. We estimate the received power level of each rectenna element from the read dc voltage level and feedback them to the transmitting array antenna. In this paper, we describe the design method and the results of the simulation and measurement of the proposed rectenna. The proposed rectenna has the rf-dc conversion efficiency of 75.3 % and the output dc voltage of 0.99 V of the feedback rectifier circuit at the input power of 34.7 dBm. Our results show that the output dc voltage of the feedback rectifier circuit is determined by the input power, resulting in the received power estimation.
TL;DR: The use of software tools allows for a more accurate, less time-consuming construction of time diagrams of the operating parameters of rectifier devices.
Abstract: Rectifier devices that convert alternating voltage into constant voltage are widely used in the energy industry. Laboratory studies allow us to obtain results showing the nature of the time dependencies of the operating parameters of rectifier devices. In this regard, the use of software tools allows for a more accurate, less time-consuming construction of time diagrams of the operating parameters of rectifier devices.
TL;DR: In this article , a grid current control method based on regulation of the rectifier current sixth harmonic is proposed to improve the grid current quality of the small dc-link capacitance (SDC) motor drives fed by three-phase diode rectifier.
Abstract: In order to improve the grid current quality of the small dc-link capacitance (SDC) motor drives fed by three-phase diode rectifier, a grid current control method based on regulation of the rectifier current sixth harmonic is proposed in this paper. Considering the 120° maximum conduction angle of the rectifier diodes, a 120° rectangular waveform with low total harmonic distortion (THD) is selected as the grid current reference. Based on the relationship between the grid current and the rectifier current, the proposed scheme shapes the grid current into the selected 120° rectangular waveform by regulating the rectifier current sixth harmonic. In this way, the grid current THD of the SDC system is significantly reduced. Since the regulation of the rectifier current harmonic is independent of the speed and motor current control loops, the proposed method avoids the complicated controller and the cumbersome parameter tuning in the grid current control process. The experimental results demonstrate the effectiveness of the proposed method.
TL;DR: In this paper , the authors proposed a new rectifier design to increase efficiency and reduce harmonics by decreasing the diode turn-on impedance compared to traditional rectifier designs, such as resonant Half Wave Rectifier (HWR).
Abstract: Power transfer efficiency (PTE) and harmonics are crucial performance parameters of the resonant rectifier design for low/medium coupling inductive wireless power transfer (WPT) systems used in wireless biomedical implants. The performance of a resonant rectifier degrades under higher loading and lower coupling conditions as the voltage available to the rectifier at the output of the receiver coil becomes low. As the diode turn-on impedance increases, diodes turn on incompletely, leading to non-linearities that reduce rectifier efficiency and output voltage. This work proposes a new rectifier design to increase efficiency and reduce harmonics by decreasing the diode turn-on impedance compared to traditional rectifier designs, such as resonant Half Wave Rectifier (HWR). The proposed rectifier design offers individual paths for RF and rectification signals, which reduces the non-linear loading on the receiver coil and improves diode turn-on performance. Measurement and SPICE simulation results show efficiency enhancement of 50% and reduction of harmonics by 6 dB for the proposed rectifier compared to HWR.
TL;DR: In this article , a self-configurable and self-powered active rectifier that operates from 0.25-20 V was proposed for energy harvesting applications, which self-startups from low voltage using a charge pump and amplifies the voltage with a voltage doubler topology to provide succeeding circuits such as boost converters with a higher voltage.
Abstract: This article presents a self-configurable and self-poweredactive rectifier that operates from 0.25–20 V for energy harvesting applications. The proposed circuit self-startups from a low voltage using a charge pump and amplifies the voltage with a voltage doubler topology to provide succeeding circuits such as boost converters with a higher voltage. When the voltage of the energy harvester reaches a high threshold, the circuit switches its topology to a full-wave rectifier that does not amplify the voltage. The start-up circuit can limit its voltage intake to prevent boosting the high voltage, which may damage the whole circuit. Comparators with a maximum operating voltage of 5.5 V used in the implementation of the rectifier are protected by a diode and resistor based circuit. A piezoelectric energy harvester (PEH) that has a wide open-circuit voltage of 0.4–15 V under the acceleration of 0.04–0.3 g was used to test the circuit. The experiment results showed the rectifier can startup from 0.25 V and switch its topology according to the PEH voltage. The voltage and power conversion efficiencies are over 90% in most cases.
TL;DR: In this article , a novel mode reduction space vector pulse width modulation (SVPWM) control method is proposed for the VIENNA rectifier, which has high reliability, high power density, and low complexity.
Abstract: The VIENNA rectifier is of high reliability, high power density, and low complexity, which has been widely applied in telecommunication systems. However, it has 25 switching states complicating the control design. Besides, it is easy for the VIENNA rectifier to distort the input currents at zero‐crossing points, which will degrade the grid power quality. To address these problems, a novel mode‐reduction space vector pulse width modulation (SVPWM) control method is proposed in this paper. By analyzing the switching states of the VIENNA rectifier, 3‐mode, 6‐mode, and 18‐mode control framework are compared, and it is found that the 18‐mode has advanced features. Specifically, the proposed 18‐mode control algorithm will have fewer calculation steps and a simpler processing flow. More importantly, it can eliminate the input current distortions for power quality improvement. A 4 kW hardware prototype of the VIENNA rectifier is developed, and experiments have been performed to verify the harmonic reduction feature of the proposed 18‐mode control.
11 Oct 2022
TL;DR: In this paper , the authors present a self-test for DC power supply and show that half-wave rectifiers and bridge rectifiers can be used to construct DC power supplies.
Abstract: No Abstract available. Chapter Contents: 3.1 Half-wave rectifiers 3.1.1 Introduction to DC power supply 3.1.2 Transformer 3.1.3 Half-wave rectifier 3.2 Full-wave rectifier 3.2.1 A center-tapped full-wave rectifier 3.2.2 Full-wave bridge rectifier 3.3 Power supply filters 3.3.1 Capacitor filter 3.3.2 Operation of the capacitor filter 3.3.3 Ripple factor and surge current 3.4 Diode clipping and clamping circuits 3.4.1 Clippers 3.4.2 Clampers Summary Self-test