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Journal articles on the topic 'PMG and rectifier system'

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Published: 4 June 2021

Last updated: 11 February 2022

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O'Hara, Thomas, and Yoram Rudy. "Quantitative comparison of cardiac ventricular myocyte electrophysiology and response to drugs in human and nonhuman species." American Journal of Physiology-Heart and Circulatory Physiology 302, no. 5 (2012): H1023—H1030. http://dx.doi.org/10.1152/ajpheart.00785.2011.

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Explanations for arrhythmia mechanisms at the cellular level are usually based on experiments in nonhuman myocytes. However, subtle electrophysiological differences between species may lead to different rhythmic or arrhythmic cellular behaviors and drug response given the nonlinear and highly interactive cellular system. Using detailed and quantitatively accurate mathematical models for human, dog, and guinea pig ventricular action potentials (APs), we simulated and compared cell electrophysiology mechanisms and response to drugs. Under basal conditions (absence of β-adrenergic stimulation), Na+/K+-ATPase changes secondary to Na+ accumulation determined AP rate dependence for human and dog but not for guinea pig where slow delayed rectifier current ( IKs) was the major rate-dependent current. AP prolongation with reduction of rapid delayed rectifier current ( IKr) and IKs (due to mutations or drugs) showed strong species dependence in simulations, as in experiments. For humans, AP prolongation was 80% following IKr block. It was 30% for dog and 20% for guinea pig. Under basal conditions, IKs block was of no consequence for human and dog, but for guinea pig, AP prolongation after IKs block was severe. However, with β-adrenergic stimulation, IKs played an important role in all species, particularly in AP shortening at fast rate. Quantitative comparison of AP repolarization, rate-dependence mechanisms, and drug response in human, dog, and guinea pig revealed major species differences (e.g., susceptibility to arrhythmogenic early afterdepolarizations). Extrapolation from animal to human electrophysiology and drug response requires great caution.

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Puglisi, José L., Weilong Yuan, Valeriy Timofeyev, et al. "Phorbol ester and endothelin-1 alter functional expression of Na+/Ca2+ exchange, K+, and Ca2+ currents in cultured neonatal rat myocytes." American Journal of Physiology-Heart and Circulatory Physiology 300, no. 2 (2011): H617—H626. http://dx.doi.org/10.1152/ajpheart.00388.2010.

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Endothelin-1 (ET-1) and activation of protein kinase C (PKC) have been implicated in alterations of myocyte function in cardiac hypertrophy and heart failure. Changes in cellular Ca2+ handling and electrophysiological properties also occur in these states and may contribute to mechanical dysfunction and arrhythmias. While ET-1 or PKC stimulation induces cellular hypertrophy in cultured neonatal rat ventricular myocytes (NRVMs), a system widely used in studies of hypertrophic signaling, there is little data about electrophysiological changes. Here we studied the effects of ET-1 (100 nM) or the PKC activator phorbol 12-myristate 13-acetate (PMA, 1 μM) on ionic currents in NRVMs. The acute effects of PMA or ET-1 (≤30 min) were small or insignificant. However, PMA or ET-1 exposure for 48–72 h increased cell capacitance by 100 or 25%, respectively, indicating cellular hypertrophy. ET-1 also slightly increased Ca2+ current density (T and L type). Na+/Ca2+ exchange current was increased by chronic pretreatment with either PMA or ET-1. In contrast, transient outward and delayed rectifier K+ currents were strongly downregulated by PMA or ET-1 pretreatment. Inward rectifier K+ current tended toward a decrease at larger negative potential, but time-independent outward K+ current was unaltered by either treatment. The enhanced inward and reduced outward currents also result in action potential prolongation after PMA or ET-1 pretreatment. We conclude that chronic PMA or ET-1 exposure in cultured NRVMs causes altered functional expression of cardiac ion currents, which mimic electrophysiological changes seen in whole animal and human hypertrophy and heart failure.

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Tang, W., A. Ruknudin, W. P. Yang, S. Y. Shaw, A. Knickerbocker, and S. Kurtz. "Functional expression of a vertebrate inwardly rectifying K+ channel in yeast." Molecular Biology of the Cell 6, no. 9 (1995): 1231–40. http://dx.doi.org/10.1091/mbc.6.9.1231.

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We describe the expression of gpIRK1, an inwardly rectifying K+ channel obtained from guinea pig cardiac cDNA. gpIRK1 is a homologue of the mouse IRK1 channel identified in macrophage cells. Expression of gpIRK1 in Xenopus oocytes produces inwardly rectifying K+ current, similar to the cardiac inward rectifier current IK1. This current is blocked by external Ba2+ and Cs+. Plasmids containing the gpIRK1 coding region under the transcriptional control of constitutive (PGK) or inducible (GAL) promoters were constructed for expression in Saccharomyces cerevisiae. Several observations suggest that gpIRK1 forms functional ion channels when expressed in yeast. gpIRK1 complements a trk1 delta trk2 delta strain, which is defective in potassium uptake. Expression of gpIRK1 in this mutant restores growth on low potassium media. Growth dependent on gpIRK1 is inhibited by external Cs+. The strain expressing gpIRK1 provides a versatile genetic system for studying the assembly and composition of inwardly rectifying K+ channels.

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Hanani, M., M. Francke, W. Härtig, J. Grosche, A. Reichenbach, and T. Pannicke. "Patch-clamp study of neurons and glial cells in isolated myenteric ganglia." American Journal of Physiology-Gastrointestinal and Liver Physiology 278, no. 4 (2000): G644—G651. http://dx.doi.org/10.1152/ajpgi.2000.278.4.g644.

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Most of the physiological information on the enteric nervous system has been obtained from studies on preparations of the myenteric ganglia attached to the longitudinal muscle layer. This preparation has a number of disadvantages, e.g., the inability to make patch-clamp recordings and the occurrence of muscle movements. To overcome these limitations we used isolated myenteric ganglia from the guinea pig small intestine. In this preparation movement was eliminated because muscle was completely absent, gigaseals were obtained, and whole cell recordings were made from neurons and glial cells. The morphological identity of cells was verified by injecting a fluorescent dye by micropipette. Neurons displayed voltage-gated inactivating inward Na+ and Ca2+currents as well as delayed-rectifier K+ currents. Immunohistochemical staining confirmed that most neurons have Na+ channels. Neurons responded to GABA, indicating that membrane receptors were retained. Glial cells displayed hyperpolarization-induced K+ inward currents and depolarization-induced K+ outward currents. Glia showed large “passive” currents that were suppressed by octanol, consistent with coupling by gap junctions among these cells. These results demonstrate the advantages of isolated ganglia for studying myenteric neurons and glial cells.

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Imoto, Y., T. Ehara, and H. Matsuura. "Voltage- and time-dependent block of iK1 underlying Ba2+-induced ventricular automaticity." American Journal of Physiology-Heart and Circulatory Physiology 252, no. 2 (1987): H325—H333. http://dx.doi.org/10.1152/ajpheart.1987.252.2.h325.

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The mechanism underlying the Ba2+-induced automaticity was studied in isolated guinea pig ventricular myocytes using the whole-cell clamp method and a patch electrode. In the presence of 0.1–0.3 mM Ba2+, application of a weak depolarizing current induced repetitive firing of spontaneous action potentials. Application of tetrodotoxin or Ca2+ channel blockers and removal of external Na+ and Ca2+ did not abolish the rhythmic activity, thereby suggesting that activation of inward currents played no crucial role in the generation of this rhythmicity. Voltage-clamp studies revealed that Ba2+ blocked the inward rectifier K+ current (iK1) in a voltage- and time-dependent manner with a greater and more rapid block at more negative potentials. This Ba2+ action could quantitatively be fitted with a model of the conventional bimolecular adsorption isotherm with a voltage-dependent dissociation constant. Simulation studies using this model showed that a membrane model, in which only the iK1 system and a small leak conductance were incorporated, could reproduce an automatic activity similar to that seen experimentally. Thus, in isolated ventricular cells, the voltage- and time-dependent block of iK1 by Ba2+ appears to be one important mechanism underlying the automaticity.

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Deng, Zi Gang, Jun Zheng, Hong Hai Song, Su Yu Wang, and Jia Su Wang. "A New HTS/PMG Maglev Design Using Halbach Array." Materials Science Forum 546-549 (May 2007): 1941–44. http://dx.doi.org/10.4028/www.scientific.net/msf.546-549.1941.

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For the high temperature superconducting (HTS) magnetic levitation (Maglev) test vehicle in china, the present NdFeB PMG has the symmetrical magnetic field distribution on the upper and lower surface. However, the vehicle only utilizes its upper magnetic field. 50% PMG magnetic field energy goes to waste, so the onboard HTSC arrays haven’t reached the best levitation performance. In order to make the HTS/PMG maglev system more efficient and reasonable, a new HTS/PMG Maglev design has been proposed based on the present PMG and the Halbach array PMG, whose PMG is called as hybrid PMG. Firstly, three magnetic field distributions of three kinds of PMG are compared using FEM. It is found that the magnetic field distribution of the hybrid PMG is more efficient for the HTSC’s maglev. The concentrating upper surface magnetic field is stronger to improve the load capability of the system. Numerical analysis and experiment are close for the present HTS/PMG system. More calculation shows that the bulk YBaCuO HTSC with the hybrid PMG has significantly better levitation performance than that with the other two PMGs. The usage of the onboard HTSC arrays is improved much and the load capability of the HTS/PMG Maglev vehicle is upgraded with the hybrid PMG.

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Vohra, Twinkle, Elisabeth Kemter, Na Sun, et al. "Effect of Dietary Sodium Modulation on Pig Adrenal Steroidogenesis and Transcriptome Profiles." Hypertension 76, no. 6 (2020): 1769–77. http://dx.doi.org/10.1161/hypertensionaha.120.15998.

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Primary aldosteronism is a frequent form of endocrine hypertension caused by aldosterone overproduction from the adrenal cortex. Regulation of aldosterone biosynthesis has been studied in rodents despite differences in adrenal physiology with humans. We, therefore, investigated pig adrenal steroidogenesis, morphology, and transcriptome profiles of the zona glomerulosa (zG) and zona fasciculata in response to activation of the renin-angiotensin-aldosterone system by dietary sodium restriction. Six-week-old pigs were fed a low- or high-sodium diet for 14 days (3 pigs per group, 0.4 g sodium/kg feed versus 6.8 g sodium/kg). Plasma aldosterone concentrations displayed a 43-fold increase ( P =0.011) after 14 days of sodium restriction (day 14 versus day 0). Low dietary sodium caused a 2-fold increase in thickness of the zG ( P <0.001) and an almost 3-fold upregulation of CYP11B ( P <0.05) compared with high dietary sodium. Strong immunostaining of the KCNJ5 (G protein-activated inward rectifier potassium channel 4), which is frequently mutated in primary aldosteronism, was demonstrated in the zG. mRNA sequencing transcriptome analysis identified significantly altered expression of genes modulated by the renin-angiotensin-aldosterone system in the zG (n=1172) and zona fasciculata (n=280). These genes included many with a known role in the regulation of aldosterone synthesis and adrenal function. The most highly enriched biological pathways in the zG were related to cholesterol biosynthesis, steroid metabolism, cell cycle, and potassium channels. This study provides mechanistic insights into the physiology and pathophysiology of aldosterone production in a species closely related to humans and shows the suitability of pigs as a translational animal model for human adrenal steroidogenesis.

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Hwang, Seung Won, and Jae Sup Shin. "Pectin-Coated Curcumin-Chitosan Microparticles Crosslinked with Mg2+ for Delayed Drug Release in the Digestive System." International Journal of Polymer Science 2018 (September 17, 2018): 1–7. http://dx.doi.org/10.1155/2018/2071071.

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Curcumin-loaded chitosan-pectin microparticles based on polymeric microencapsulation were prepared by two methods to delay the release of curcumin in the digestive system, employing Mg2+ as a pectin-crosslinking agent for the first time. Pectin-coated curcumin-chitosan microparticles (C-g-PMg) and curcumin-loaded chitosan-pectin composite microparticles (C-PMg-g) were formulated, and their release profiles at pH 1.2 and at pH 6.8 were tested. The former (C-g-PMg) showed slower curcumin release profiles than the latter (C-PMg-g) because the C-g-PMg are composed of two layers, a chitosan-glutaraldehyde layer and a pectin-Mg2+ layer, which together hold the curcumin for a longer duration. Of the pectin-coated microparticles, those crosslinked with Mg2+ showed a slower release rate than those crosslinked with Ca2+, but the former showed a faster release rate at pH 6.8 in the presence of pectinase, acting as a promising drug delivery carrier for treating a colonic disease. The pectin layer and the pectin-crosslinking agent play a vital role in prolonging the release of curcumin until pectin is degraded by pectinase.

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Sun, R. X., Z. G. Deng, Y. F. Gou, et al. "Feasibility of low-cost magnetic rail designs by integrating ferrite magnets and NdFeB magnets for HTS Maglev systems." International Journal of Modern Physics B 29, no. 25n26 (2015): 1542043. http://dx.doi.org/10.1142/s0217979215420436.

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Permanent magnet guideway (PMG) is an indispensable part of high temperature superconducting (HTS) Maglev systems. Present PMGs are made of NdFeB magnets with excellent performance and cost much. As another permanent magnet material, the ferrite magnet is weak at magnetic energy product and coercive force, but inexpensive. So, it is a possible way to integrate the ferrite and NdFeB magnets for cutting down the cost of present PMGs. In the paper, the equivalent on magnetic field intensity between ferrite magnets and NdFeB magnets was evaluated by finite element simulation. According to the calculation results, the magnetic field of the PMG integrating ferrite magnets and NdFeB magnets can be increased remarkably comparing with the pure ferrite PMG. It indicates that low-cost PMG designs by integrating the two permanent magnet materials are feasible for the practical HTS Maglev system.

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Yamada, Hiroshi, Tadashi Masuda, and Morihiko Okada. "Age-Related EMG Variables during Maximum Voluntary Contraction." Perceptual and Motor Skills 95, no. 1 (2002): 10–14. http://dx.doi.org/10.2466/pms.2002.95.1.10.

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We studied the neuromuscular adaptation that occurs with aging by comparing changes in surface electromyography (EMG) variables from the tibialis anterior muscle in 12 young (21.4 ± 1.7 yr. old) and 13 older subjects (70.8 ± 3.0 yr. old). EMG variables such as the muscle fiber conduction velocity, median frequency, and averaged rectified value were calculated during maximum voluntary contraction for 5-sec, isometric contractions. The dorsiflexion force, muscle fiber conduction velocity, median frequency, and average rectified value during maximum voluntary contraction were significantly smaller in the older than in the younger group ( p <.05). These results suggested char the neuromuscular system in older subjects is affected by the selective atrophy of fast twitch fibers and differences in motor unit firing statistics. Our results suggest the utility of applying the EMG observed during maximum voluntary contraction to the noninvasive evaluation of neuromuscular function in elderly persons.

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Irasari, Pudji, Muhammad Fathul Hikmawan, and Puji Widiyanto. "Torque Characteristic Analysis of Outer Rotor Permanent Magnet Generator for Low Head Hydro Power Application." Jurnal IPTEK 23, no. 2 (2019): 79–86. http://dx.doi.org/10.31284/j.iptek.2019.v23i2.524.

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This paper analyzes the torque characteristics of outer rotor PMG for low head hydro power application. The aim is to prevent the generator torque from exceeding the turbine torque as the prime mover so that the system can work properly in both start and steady state conditions. The PMG is of outer rotor type and the torques are calculated analytically and numerically. The analysis is focused only on the PMG without connecting it to the turbine. Two analyzed torques include electromagnetic torque and starting torque, which comprises cogging torque, hysteresis torque and friction torque. The electromagnetic torque was obtained by loading the PMG with resistance and impedance (RL-LL in series) respectively. The results indicate that electromagnetic torque is the highest among all the investigated torques although its value is only 5.6% of the turbine torque, and cogging torque is the highest among the starting torque. From those results, it can be concluded that the hydro turbine torque can overcome the generator torque both at start and steady state conditions.

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Li, Jianying, Longfu Luo, and Jiazhu Xu. "A Harmonic Suppression Rectifier Transformer with Filters for an Industrial Rectifier System." Recent Advances in Electrical & Electronic Engineering (Formerly Recent Patents on Electrical & Electronic Engineering) 7, no. 1 (2014): 65–74. http://dx.doi.org/10.2174/2213111607666140517002643.

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Doan, Chuc Huu, and Duong Gia Bach. "Investigation of Rectifier Circuit Configurations for Microwave Power Transmission System Operating at S Band." International Journal of Electrical and Computer Engineering (IJECE) 5, no. 5 (2015): 967. http://dx.doi.org/10.11591/ijece.v5i5.pp967-974.

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The purpose of this work is to propose rectifier circuit topologies for microwave power transmission system operating at ISM band. This paper particularly presents in detail the proposed rectifier circuit configurations including series diode half wave rectifier and voltage doubler rectifier. The maximum conversion efficiency of rectifier using series diode half wave rectifier is 40.17 % with 220 W load resistance whereas it is 70.06 % with 330 W load resistance for voltage doubler rectifier. Compared to the series rectifier circuit, it is significant to note that the voltage doubler rectifier circuit has higher efficiency. The circuits presented are tuned for a center frequency of 2.45 GHz. The rectifiers were fabricated using microstrip technology. The design, fabrication and measurement results were obtained using a well-known professional design software for microwave engineering, Advanced Design System 2009 (ADS 2009). All design and measurement results will be reported.

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Yamada, Hiroshi, Kimihiro Kaneko, and Tadashi Masuda. "Effects of Voluntary Activation on Neuromuscular Endurance Analyzed by Surface Electromyography." Perceptual and Motor Skills 95, no. 2 (2002): 613–19. http://dx.doi.org/10.2466/pms.2002.95.2.613.

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The purpose was to examine the relation between voluntary muscle activation and neuromuscular endurance of individual subjects based on the pattern of surface electromyography (EMG). The voluntary muscle activation was estimated from the relation between voluntary force and tetanic force superimposed on the voluntary force (twitch interpolation technique). 11 male subjects (10 regular exercisers and 4 sedentary; 21–29 years old) were divided into a High Voluntary Activation group and a Low Voluntary Activation group. A significant positive correlation of .72 (p<.01) was found between maximum voluntary torque and voluntary activation. A fatigue test was conducted during isometric contractions of 60% and 20% maximum voluntary torque. The endurance time was significantly longer for the Low Voluntary Activation group than the High Voluntary Activation group. The mean power frequency of voluntary EMG obtained from the vastus lateralis muscle decreased consistently whereas the average rectified value increased. The final change of mean power frequency relative to the initial value was significantly greater in the 60% Fatigue task than in the 20% Fatigue task. For the 60% Fatigue task, the final change of mean power frequency and average rectified value relative to the initial value was significantly greater in the Low Voluntary Activation group than in the High Voluntary Activation group. These results suggest that the individual differences in voluntary activation determine the neuromuscular performance usually evaluated as maximum voluntary torque and endurance time and that the voluntary activation may depend on the daily exercise.

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Lou, Bei, Xi Peng Guo, Jun Xin, Gen Yong Chen, Jin Feng Yang, and Xiao Yi Chen. "Simulation Analysis of Zhengzhou Metro Power Supply System Rectifier Unit." Advanced Materials Research 732-733 (August 2013): 707–11. http://dx.doi.org/10.4028/www.scientific.net/amr.732-733.707.

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Developing the Zhengzhou rail transit as a new transportation plays an important role in easing traffic congestion and promoting the economic development. The principle, connection mode and harmonic generation mechanism of the rectifier unit of Zhengzhou rail transit is analysed in theoretical. 12-pulse and 24-pulse rectifier unit model is simulated in MATLAB/Simulink environment. The simulation result shows that the 24-pulse rectifier unit can reduce the harmonic current injected to the power system greatly, and abate the effects on the utility grid compared with the 12-pulse rectifier unit. The 24-pulse rectifier can smoothen the output voltage, reduce the harmonic content and improve the quality of DC power supply. So it can obviously reduce the adverse effects on public power grid.

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Steinbuch, M., and O. Bosgra. "Dynamic modeling of a generator/rectifier system." IEEE Transactions on Power Electronics 7, no. 1 (1992): 212–23. http://dx.doi.org/10.1109/63.124593.

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Saleh, S. A., and R. Ahshan. "Resolution-Level-Controlled WM Inverter for PMG-Based Wind Energy Conversion System." IEEE Transactions on Industry Applications 48, no. 2 (2012): 750–63. http://dx.doi.org/10.1109/tia.2012.2182750.

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Liu, Lu, Jiasu Wang, Suyu Wang, Lulin Wang, and Jing Li. "Flux Concentrator Optimization of PMG for High-Temperature Superconducting Maglev Vehicle System." Journal of Low Temperature Physics 157, no. 1-2 (2009): 67–72. http://dx.doi.org/10.1007/s10909-009-9926-7.

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Qin, Yujie, and Yiyun Lu. "Magnetic fields end-face effect investigation of HTS bulk over PMG with 3D-modeling numerical method." International Journal of Modern Physics B 29, no. 25n26 (2015): 1542041. http://dx.doi.org/10.1142/s0217979215420412.

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In this paper, the magnetic fields end-face effect of high temperature superconducting (HTS) bulk over a permanent magnetic guideway (PMG) is researched with 3D-modeling numerical method. The electromagnetic behavior of the bulk is simulated using finite element method (FEM). The framework is formulated by the magnetic field vector method (H-method). A superconducting levitation system composed of one rectangular HTS bulk and one infinite long PMG is successfully investigated using the proposed method. The simulation results show that for finite geometrical HTS bulk, even the applied magnetic field is only distributed in [Formula: see text]–[Formula: see text] plane, the magnetic field component Hz which is along the [Formula: see text]-axis can be observed interior the HTS bulk.

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Jun, Rong. "The Simulation Study of Direct-Current Control Technology for Three-Phase Voltage Type Rectifier." Applied Mechanics and Materials 556-562 (May 2014): 2105–9. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.2105.

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The diode uncontrolled rectifier or the phase controlled rectifier is widely used in conventional rectifier link, thus the conventional rectifier link on the grid inject a large number of harmonics and reactive power, and they cause a severe grid “pollution”. This paper starts from the basic principles of the PWM rectifier, then the paper discusses the topological classification of three-phase PWM rectifier in detail. Based on topological structure, the paper builds the mathematical model of three-phase stationary coordinate system and two-phase rotating coordinate system. Based on space voltage vector, the paper studies PWM control method in-depth and simulates in Matlab/Simulink. The correctness of the theoretical study of three-phase voltage source PWM rectifier system is verified by the simulation results.

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Jing, Hua, Ming Jiang, and Su Yu Wang. "The Relationship between Temperature and Levitation Stiffness of YBCO Bulk for Maglev Vehicle." Applied Mechanics and Materials 236-237 (November 2012): 1270–74. http://dx.doi.org/10.4028/www.scientific.net/amm.236-237.1270.

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In order to make the levitation performance of the high temperature superconducting (HTS) magnetic levitation (Maglev) vehicle more stable and safer, in this paper, using a cryogenic measurement system, we measured the levitation forces of YBCO bulk above halbach-type permanent magnet guideway (Halbach PMG) in the temperature range from 77 K to 60 K, then in the condition of deep cryogenic, the levitation forces of YBCO bulk at different field cooling heights (FCHs) were also measured, according to which the levitation stiffness were calculated. The results show that the levitation stiffness of HTS/PMG Maglev system is better at lower temperature. Moreover, when the temperature of YBCO bulk decreases from 77 K to 73 K, the levitation stiffness largely increases in any FCHs. However, after the temperature of the bulk decreases to 73 K, the rate of the levitation stiffness increased gradually reduces. The results are helpful to HTS Maglev vehicle application.

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Ding, Qiu Qi, Min Tao, and Yun Xiang Jia. "Analysis of Electromagnetic Interference in Rectifier and Inverter System." Applied Mechanics and Materials 536-537 (April 2014): 1547–50. http://dx.doi.org/10.4028/www.scientific.net/amm.536-537.1547.

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Aiming at the problem of electromagnetic interference in design and application of electronic rectifier and inverter system, introduces the electromagnetic interference and electromagnetic compatibility characteristics of common circuit, the interference test of rectifier and inverter system, puts forward the products it has produced inhibition method of interference. The test results show that the method can reduce electromagnetic interference system greatly.

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Kolar, J. W., U. Drofenik, and F. C. Zach. "VIENNA rectifier II-a novel single-stage high-frequency isolated three-phase PWM rectifier system." IEEE Transactions on Industrial Electronics 46, no. 4 (1999): 674–91. http://dx.doi.org/10.1109/41.778214.

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Zhou, Dajin, Lifeng Zhao, Linbo Li, et al. "Study of Running Stability in Side-Suspended HTS-PMG Maglev Circular Line System." Journal of Physics: Conference Series 871 (July 2017): 012093. http://dx.doi.org/10.1088/1742-6596/871/1/012093.

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Hachisuka, Michihiro, Takuya Fukuhara, Yasuyoshi Kaneko, and Shigeru Abe. "Inverter-Rectifier Using SiC Power Devices for Bidirectional Wireless Power Transfer System of Electric Vehicles." Materials Science Forum 778-780 (February 2014): 1100–1103. http://dx.doi.org/10.4028/www.scientific.net/msf.778-780.1100.

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The bidirectional wireless power transfer system will have many advantages to charge the batteries of the electric vehicles. In their power supply circuit, the efficiency of the inverter and rectifier is important for total system efficiency. The inverter-rectifier, which is a type of power supply circuit in this system, performs inverter operation and rectifier operation. To reduce the loss of operation modes of both, we decided to use SiC power devices that are able to reduce switching loss. However, there is a problem of high conduction loss caused by the use of SiC power devices in rectifier operation. We propose the method of parallelizing SiC-MOSFET and diode of low forward voltage, and achieved a higher efficiency.

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Senthilnathan, Karthikrajan, and K. Iyswarya Annapoorani. "Co-simulation and hardware implementation of multi-port rectifier for power system and renewable energy applications." Wind Engineering 43, no. 2 (2018): 162–74. http://dx.doi.org/10.1177/0309524x18780389.

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In this article, a novel rectifier is designed for two three-phase sources with single-phase inverter and three-phase inverter. The proposed configuration results in back-to-back converter with the dual input source. The main objective is to reduce the semiconductor components in the rectifier. The rectifier design consists of six diodes and three split capacitors. A separate direct current link capacitor is eliminated due to the presence of split capacitors. The simulation model of rectifier and inverter is designed in Multisim, a PSpice-based power electronics simulator, and interfaced with LabVIEW, a graphical programming language for co-simulation. The co-simulation enables the user to utilize two simulation engines for better analysis. The hardware prototype is fabricated and tested for rectifier and inverter. The co-simulation and hardware results proved that proposed design is capable to use in back-to-back converter applications.

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Jeon, Hyeonmin, Jongsu Kim, and Kyoungkuk Yoon. "Large-Scale Electric Propulsion Systems in Ships Using an Active Front-End Rectifier." Journal of Marine Science and Engineering 7, no. 6 (2019): 168. http://dx.doi.org/10.3390/jmse7060168.

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In the case of the electric propulsion system on the vessel, Diode Front End (DFE) rectifiers have been applied for large-sized ships and Active Front End (AFE) rectifiers have been utilized for small and medium-sized ships as a part of the system. In this paper, we design a large electric propulsion ship system using AFE rectifier with the proposed phase angle detector and verify the feasibility of the system by simulation. The phase angle derived from the proposed phase angle detection method is applied to the control of the AFE rectifier instead of the zero-crossing method used to detect the phase angle in the control of the conventional AFE rectifier. We compare and analyze the speed control, Direct Current (DC)-link voltage, harmonic content and measurement data of heat loss by inverter switch obtained from the simulation of the electric propulsion system with the 24-pulse DFE rectifier, the conventional AFE rectifier, and the proposed AFE rectifier. As a result of the simulation, it was confirmed that the proposed AFE rectifier derives a satisfactory result similar to that of a 24-pulse DFE rectifier with a phase shifting transformer installed according to the speed load of the ship, and it can be designed and applied as a rectifier of a large-sized vessel.

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Rybicki, Krystian, and Rafał M. Wojciechowski. "Analysis and design of a class E current-driven rectifier for 1 MHz wireless power transfer system." Journal of Electrical Engineering 70, no. 1 (2019): 58–63. http://dx.doi.org/10.2478/jee-2019-0008.

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Abstract The paper presents the design of the class E current-driven rectifier, which is intended for operation in the wireless power transmission system, as well as the concept of selection of the rectifier parameters which allows the operation with high efficiency. The selection of the rectifier parameters was performed with a view to the use of the existing wireless power transmission (WPT) system. The procedure for selection of the rectifier parameters has been proposed to enable its optimal use in reference to the system parameters given already at the design stage, ie; load resistance and the coil magnetic coupling factor (distance between coils). In order to verify the correctness of the procedure for selection of the parameters, the numerical model of the system which consists of the class E resonance inverter, the air-core transformer and the designed E class rectifier system was developed in the LTspice environment. Simulation tests and analysis of the obtained calculation results were performed. Based on the simulation results, a prototype of the class E rectifier system which cooperates with the existing wireless power transmission system supplied from the class E inverter was developed. The obtained results of laboratory measurements demonstrated a high compliance with the simulation results, thus, confirming the correctness of the proposed design procedure and the high operating efficiency of the rectifier system.

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Lu, Yiyun, and Yujie Qin. "Influence of critical current density on magnetic force of HTSC bulk above PMR with 3D-modeling numerical solutions." International Journal of Modern Physics B 29, no. 25n26 (2015): 1542038. http://dx.doi.org/10.1142/s0217979215420382.

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Numerical simulations of thermo-electromagnetic properties of a high temperature superconducting (HTS) bulk levitating over a permanent magnetic guideway (PMG) are performed by resorting to the quasistatic approximation of the H-method coupling with the classical description of the heat conduction equation. The numerical resolving codes are practiced with the help of the finite element program generation system (FEPG) platform using finite element method (FEM). The [Formula: see text]–[Formula: see text] power law is used to describe the electric current nonlinear characteristics of HTS bulk. The simulation results show that the heat conduction and the critical current density are tightly relative to the thermal effects of the HTS bulk over the PMG. The heat intensity which responds to the heat loss of the HTS bulk is mainly distributed at the two bottom-corners of the bulk sample.

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Radionova, L. V., and A. D. Chernyshev. "Mathematical Description of AFE Rectifier Closed Loop System." Procedia Engineering 129 (2015): 16–21. http://dx.doi.org/10.1016/j.proeng.2015.12.062.

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Khairudin, M., N. Parwantiningsih, E. Panji, and R. Prayoga. "Water level control system using silicon controlled rectifier." Journal of Physics: Conference Series 1456 (January 2020): 012013. http://dx.doi.org/10.1088/1742-6596/1456/1/012013.

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Solanki, Jitendra, Norbert Frohleke, Joachim Bocker, Gregor Duppe, Andreas Averberg, and Peter Wallmeier. "Voltage-Sequence-Control-Based High-Current Rectifier System." IEEE Transactions on Industry Applications 51, no. 5 (2015): 3995–4005. http://dx.doi.org/10.1109/tia.2015.2422772.

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Yazdani, A., and R. Iravani. "Control of high-performance switched-mode rectifier system." IEE Proceedings - Electric Power Applications 152, no. 6 (2005): 1451. http://dx.doi.org/10.1049/ip-epa:20045259.

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Hlaing, Htar Su, Jia Liu, Hassan Bevrani, and Toshifumi Ise. "PMSG Control for a Stand-Alone Gas Engine Generator Using Active Rectifier and VSG-Controlled Inverter." Energies 13, no. 1 (2020): 233. http://dx.doi.org/10.3390/en13010233.

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The engine generator system with a diode rectifier causes harmonic currents in the generator which can affect generator efficiency and may produce torque oscillations. Using an active rectifier instead of a diode rectifier helps us to improve the current waveforms. In this paper, an active rectifier is used for a stand-alone gas engine generation system with a permanent magnet synchronous generator (PMSG). The generator side converter and the load side converter can be controlled separately to achieve high performance and reliability of the system. In the proposed control framework, the generator side converter is controlled by means of a current vector control method in a cascade structure with the synchronous reference frame (dq- frame). In the proposed control scheme, the dc link voltage is controlled by the generator side converter. For load side converter control, the concept of virtual synchronous generator control method is adopted to support a smooth power transient during the load changes. To verify the usefulness of the proposed control structure, using PSCAD software (version 4.2.1), the system transient responses with both a diode rectifier and an active rectifier are investigated under loading and load removal cases. Moreover, for the system with an active rectifier, the transient response of the system with different vector control strategies of PMSG is also investigated.

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Touimi, Khalil, Mohamed Benbouzid, and Zhe Chen. "Optimal Design of a Multibrid Permanent Magnet Generator for a Tidal Stream Turbine." Energies 13, no. 2 (2020): 487. http://dx.doi.org/10.3390/en13020487.

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Tidal stream energy is acquiring more attention as a future potential renewable energy source. Considering the harsh submarine environment, the main challenges that face the tidal stream turbine (TST) industry are cost and reliability. Hence, simple and reliable technologies, especially considering the drivetrain, are preferred. The multibrid drivetrain configuration with only a single stage gearbox is one of the promising concepts for TST systems. In this context, this paper proposes the design optimization of a multibrid permanent magnet generator (PMG), the design of a planetary gearbox, and afterwards analyzes the multibrid concept cost-effectiveness for TST applications. Firstly, the system analytical model, which consists of a single-stage gearbox and a medium speed PMG, is presented. The optimization methodology is afterwards highlighted. Lastly, the multibrid system optimization results for different gear ratios including the direct-drive topology are discussed and compared where the suitable gear ratio (topology) is investigated. The achieved results show that the multibrid concept in TST applications seems more attractive than the direct-drive one especially for high power ratings.

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Ye, Chang Qing, Zi Gang Deng, and Jia Su Wang. "Analysis of the Permanent Magnet Guideway of High Temperature Superconducting Maglev." Materials Science Forum 745-746 (February 2013): 197–202. http://dx.doi.org/10.4028/www.scientific.net/msf.745-746.197.

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t was theoretically and experimentally proved that High Temperature Superconducting (HTS) Maglev had huge potential employment in rail transportation and high speed launch system. This had attracted great research interests in practical engineering. The optimization design was one of the most important works in the application of the HTS Maglev. As the NdFeB permanent magnet and HTS materials prices increased constantly, the design optimization of the permanent guideway (PMG) of HTS maglev became one of the indispensable works to decrease the cost of the application. This paper first reviewed four types of PMGs used by the HTS Maglev, then disucssed their structures and magnetic fields. Finally, the optimization methods of these four PMGs were compared. It was suggested that with better optimization methods, the levitation performance within a limit cost got better. That would be helpful to the future numerical optimization of the PMG of the HTS maglev.

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Ma, Yu Ling, Jiu He Wang, and Hao Xiang. "A Passivity-Based Power Control Strategy of VSR PWM Rectifier under Unbalance Voltage." Advanced Materials Research 622-623 (December 2012): 1503–9. http://dx.doi.org/10.4028/www.scientific.net/amr.622-623.1503.

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In actual application the three-phase gird voltage is unbalanced, but the control strategy of PWM rectifier is always based on balance grid voltage. So the control research of rectifier under unbalance voltage is necessary .In view of the mathematical of rectifier is nonlinear, we will adopt a kind of nonlinear control strategy called Passivity-Based Control (PBC).First based on Symmetric component theory we extract positive sequence of unbalance grid voltage, and then establish the standard Euler-Lagrange (EL) model of rectifier under positive sequence, next we design the system controller based on the PBC theory. Based on passivity of rectifier, we can redistribute the system energy, and improve system performance. Simulation results show that PBC method under unbalance grid voltage is practicable.

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Asli, Astrie Nurasyeila Fifie, and Yan Chiew Wong. "3.3V DC output at -16dBm sensitivity and 77% PCE rectifier for RF energy harvesting." International Journal of Power Electronics and Drive Systems (IJPEDS) 10, no. 3 (2019): 1398. http://dx.doi.org/10.11591/ijpeds.v10.i3.pp1398-1409.

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<span>This paper presents a high voltage conversion at high sensitivity RF energy harvesting system for IoT applications. The harvesting system comprises bulk-to-source (BTMOS) differential-drive based rectifier to produce a high efficiency RF energy harvesting system. Low-pass upward impedance matching network is applied at the rectifier input to increase the sensitivity and output voltage. Dual-oxide-thickness transistors are used in the rectifier circuit to maintain the power efficiency at each stage of the rectifier. The system is designed using 0.18µm Silterra RF in deep n-well process technology and achieves 4.07V output at -16dBm sensitivity without the need of complex auxiliary control circuit and DC-DC charge-pump circuit. The system is targeted for urban environment.</span>

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Krylov, D. S., and O. I. Kholod. "The efficiency of the active controlled rectifier operation in the mains voltage distortion mode." Electrical Engineering & Electromechanics, no. 2 (April 10, 2021): 30–35. http://dx.doi.org/10.20998/2074-272x.2021.2.05.

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Goal. Checking the efficiency of the active rectifier with differences types of control systems in conditions of deep voltage distortions of a three-phase three-wire supply network. Methodology. The authors have used the Matlab/Simulink software environment to create a model of an active rectifier with various types of control systems as part of a frequency electric drive. We performed a series of simulations of the operating modes of an active rectifier with various control systems when the supply voltage is distorted. Results. When the active rectifier is operating in an unregulated mode, the distortions of the current and mains voltage exceed the maximum permissible values. The quality indicators of the mains current and mains voltage are significantly higher than the normally permissible values. In the absence of voltage distortions in the supply network, the operation of the active rectifier can effectively eliminate the distortions of the mains current, regardless of the type of control system of the active rectifier. In conditions of deep distortions of the supply network voltage, the operation of an active rectifier with a vector control system is more efficient than with a parametric control system. Originality. Criteria for determining the quality of consumed electricity at the connection point of the circuit are proposed. Practical significance. Recommendations have been developed for the use of active rectifier control systems when working with a distorted power supply voltage.

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Penczek, Adam, Andrzej Mondzik, and Tomasz Siostrzonek. "Three Phase AC-Line Converter for the Flywheel Energy Storage System." Solid State Phenomena 147-149 (January 2009): 167–72. http://dx.doi.org/10.4028/www.scientific.net/ssp.147-149.167.

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he paper presents a three-phase rectifier with sinusoidal source current which enables energy to be fed back to the AC supply network. It has been used in a flywheel energy storage system. The principle of operation and control methods of the three-phase rectifier are discussed. The experimental setup employing a DSP controller co-operating with CPLD device is described. Results of experimental investigation for both the steady and transient states are presented in the concluding section.

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Rajab, Muhammad Novian Rahmatur. "Rectifier Design in RF Energy Harvesting System with Television Antenna at UHF Frequency." Jurnal Jartel: Jurnal Jaringan Telekomunikasi 9, no. 4 (2019): 25–30. http://dx.doi.org/10.33795/jartel.v9i4.143.

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Nowadays, the development of technology is increasing rapidly, one of which is the development of telecommunication technology. Telecomunication provides communication services by using radio waves as information carriers, as a result of the large number of electromagnetic waves in the natural surroundings. From this, various studies have now been developed in order to be able to utilize the energy contained in electromagnetic waves that are around as an alternative energy source, also called Energy Harvesting. The purpose of making this thesisis to make a rectifier and integrated with a television antenna to convert the RF signal at the UHF frequency (470MHz-807 MHz) into DC voltage energy as an Energy Harvesting system. In this final project, a 2.4 and 6-stage voltage douber rectifier was designed using the HSMS 2820 diode and integrated with television antenna. The results of the rectifier circuit made are circuit simulation. The rectifier is able to convert the AC input to DC and amplify the output voltage to achieve multiple stages of the circuit used. In the 6-stage rectifier circuit fabrication test, the largest output produced reached 1.3 V with an input of 0.398 V at a frequency of 470 MHz while the output was the smallest is 3 mV with an input of 0.022 V at a frequency of 637 MHz, and in testing using a TV antenna as an RF signal catcher from the transmitter, the largest voltage obtained reaches 1,019 V in a 6-stage circuit, the output voltage is DC voltage.

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Vorontsov, A., V. Glushakov, M. Pronin, and Yu Sychev. "Cascade frequency converters control features." Journal of Mining Institute 241 (February 25, 2020): 37. http://dx.doi.org/10.31897/pmi.2020.1.37.

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The structures of systems with high-voltage cascade frequency converters containing multi-winding transformers and low-voltage low-power converters connected in series at each output phase of the load are considered. Low-voltage blocks contain three-phase diode or active rectifiers, DC capacitor filters, single-phase stand-alone voltage inverters and block disconnecting devices in partial modes (in case of failure when part of the blocks are disconnected). The possibilities of operation of cascade converters are determined, equations for correcting tasks to units in partial modes are given, tables of correction of tasks with estimates of achievable load characteristics are proposed. The results of experiments on the model of a powerful installation with a cascade frequency converter are presented, confirming the possibility of ensuring the symmetry of the load currents when disconnecting part of the blocks and the asymmetry of the circuit.

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Wang, Jiu He, and Hong Ren Yin. "Decoupling Control of Three Phase Boost Type PWM Rectifiers Based on Storage Function." Applied Mechanics and Materials 71-78 (July 2011): 3988–91. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.3988.

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Based on the model of three phase boost type PWM rectifier in synchronous dq coordinates, a simple control law, which transforms the rectifier control system into decoupling and linear one,is deduced based on storage function. New rectifier control system based on the law has many advantages, such as simpler structure, and low total harmonic distortion,and good robustness for load. Decouping control system of three phase boost type PWM rectifiers is proved feasible by simulink simulation.

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Radzuan, Roskhatijah, Mohd Khairul Mohd Salleh, Nuha A. Rhaffor, and Shukri Korakkottil Kunhi Mohd. "0.18µm-CMOS Rectifier with Boost-converter and Duty-cycle-control for Energy Harvesting." Bulletin of Electrical Engineering and Informatics 7, no. 2 (2018): 161–68. http://dx.doi.org/10.11591/eei.v7i2.1175.

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Existing works on battery-less of energy harvesting systems often assume as a high efficiency of rectifier circuit for power management system. In practice, rectifier circuit often varies with output power and circuit complexity. In this paper, based on a review of existing rectifier circuits for the energy harvesters in the literature, an integrated rectifier with boost converter for output power enhancement and complexity reduction of power management system is implemented through 0.18-micron CMOS process. Based on this topology and technology, low threshold-voltage of MOSFETs is used instead of diodes in order to reduce the power losses of the integrated rectifier circuit. Besides, a single switch with the duty-cycle control is introduced to reduce the complexities of the integrated boost converter. Measurement results show that the realistic performances of the rectifier circuit could be considerably improved based on the performances showed by the existing study.

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Raheem Esmail Alselwi, Mohammed Abdul, Yan Chiew Wong, and Zul Atfyi Fauzan Mohammed Napiah. "Integrated cmos rectifier for rf-powered wireless sensor network nodes." Bulletin of Electrical Engineering and Informatics 8, no. 3 (2019): 829–38. http://dx.doi.org/10.11591/eei.v8i3.1579.

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This article presents a review of the CMOS rectifier for radio frequency energy harvesting application. The on-chip rectifier converts the ambient low-power radio frequency signal coming to antenna to useable DC voltage that recharges energy to wireless sensor network (WSN) nodes and radiofrequency identification (RFID) tags, therefore the rectifier is the most important part of the radio frequency energy harvesting system. The impedance matching network maximizes power transfer from antenna to rectifier. The design and comparison between the simulation results of one- and multi-stage differential drive cross connected rectifier (DDCCR) at the operating frequencies of 2.44GHz, and 28GHz show the output voltage of the multi-stage rectifier doubles at each added stage and power conversion efficiency (PCE) of rectifier at 2.44GHz was higher than 28GHz. The (DDCCR) rectifier is the most efficient rectifier topology to date and is used widely for passive WSN nodes and RFID tags.

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Hong, Wen Peng, and Song Chen Jian. "Numerical Simulation of Flue Gas Flow and NH₃ Diffusion Properties in SCR System." Advanced Materials Research 881-883 (January 2014): 1819–22. http://dx.doi.org/10.4028/www.scientific.net/amr.881-883.1819.

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The numerical model of SCR denitrification system is established. Simulate the SCR system where installs mixer by the way of installing rectifier grille and three types of guide plates to analyze the changes of velocity, pressure and ammonia concentration before catalyst layer. The results indicate that setting rectifier grille and changing the guide plate size can make velocity and pressure of the whole flow are more stable. In plan 4, the deviation of ammonia concentration at the catalyst inlet section is 3.58%, avoid the phenomenon of ammonia escape and its satisfies the design requirements of SCR denitration system Keywords: SCR denitrification system; rectifier grille; guide plates; pressure drop

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Krystkowiak, Michal, and Michal Gwóźdź. "Three-phase diode rectifier with current modulator in DC circuit based on multi-channel converter." Archives of Electrical Engineering 66, no. 3 (2017): 533–45. http://dx.doi.org/10.1515/aee-2017-0040.

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AbstractIn the paper the 3-phase power diode rectifier system with quasi-sinusoidal input (power grid) current is presented. In order to benefit from it, the current modulation in the DC circuit of a rectifier is used. The essential part of the current modulator is the wide-band power electronics controlled current source based on a multi-channel converter. The control algorithm of the current modulator respects impact of aliasing phenomena at system stability by using the method proposed by the authors. The paper includes the rectifier system description and rules of operation of the current modulator. Also, some results of research on both the rectifier simulation model and the laboratory prototype of a current modulator are presented.

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KOPTYAYEV, Evgenii N., Vyacheslav M. BALASHEVICH, and Sergey S. ABRAMOV. "A Rectifier with «Side» Ripple for Power System Applications." Elektrichestvo, no. 7 (2017): 55–59. http://dx.doi.org/10.24160/0013-5380-2017-7-55-59.

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YANG, Chunhua, Hongqiu ZHU, Weihua GUI, and Yonggang LI. "Improved-PSO-based optimal scheduling for rectifier power system." IFAC Proceedings Volumes 41, no. 2 (2008): 6078–83. http://dx.doi.org/10.3182/20080706-5-kr-1001.01026.

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Yang, Yin Sha, Yan Xia Gao, and Yuan Jie Luo. "Research of PWM Rectifier System Based on Infineon XMC4500." Applied Mechanics and Materials 740 (March 2015): 479–82. http://dx.doi.org/10.4028/www.scientific.net/amm.740.479.

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SVPWM is widely used in power electronic transformation system for it has high voltage utilization ratio and small THD. The InfineonXMC4500 MCU is used as the control core in the lithium battery charge and discharge control system which has three-phase SVPWM rectifier/inverter circuit topology. The mathematical model of the system, the circuit structure, control strategy and software process are introduced in the paper, through the test the results verify the validity of the system.

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