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Reduction of Components in New Family of Diode Clamp Multilevel Inverter Ordeal to Induction Motor
Angamuthu, Rathinam,Thangavelu, Karthikeyan,Kannan, Ramani The Institute of Electronics and Information Engin 2016 Journal of semiconductor technology and science Vol.16 No.1
This paper describes the design and implementation of a new diode clamped multilevel inverter for variable frequency drive. The diode clamp multilevel inverter has been widely used for low power, high voltage applications due to its superior performance. However, it has some limitations such as increased number of switching devices and complex PWM control. In this paper, a new topology is proposed. New topology requires only (N-1) switching devices and (N-3) clamping diodes compared to existing topology. A modified APO-PWM control method is used to generate gate pulses for inverter. The proposed inverter topology is coupled with single phase induction motor and its performance is tested by MATLAB simulation. Finally, a prototype model has built and its performance is tested with single phase variable frequency drive.
Rathinam Angamuthu,Balaji Govindan 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.11
The proposed system deals with the conversion of solar power into fundamental AC power by using flying capacitor multilevel inverter controlled by synchronous sequential circuits. The flying capacitor multilevel inverter controls the real and reactive power flow, deep voltage sags and short duration outages. The performance of the inverter is enhanced by using a synchronous sequential circuit, which gives the superior performance by reducing the total harmonic distortion in load voltage and capacitor voltage fluctuations. The synchronous sequential circuit based multilevel inverter offers several advantages like simpler structure, easy fault identification, cost-effectiveness and low power consumption. The performance of proposed strategy has been confirmed through simulation and hardware investigations.
Approximation by Generalized Kantorovich Sampling Type Series
Kumar, Angamuthu Sathish,Devaraj, Ponnaian Department of Mathematics 2019 Kyungpook mathematical journal Vol.59 No.3
In the present article, we analyse the behaviour of a new family of Kantorovich type sampling operators $(K^{\varphi}_wf)_{w>0}$. First, we give a Voronovskaya type theorem for these Kantorovich generalized sampling series and a corresponding quantitative version in terms of the first order of modulus of continuity. Further, we study the order of approximation in $C({\mathbb{R}})$, the set of all uniformly continuous and bounded functions on ${\mathbb{R}}$ for the family $(K^{\varphi}_wf)_{w>0}$. Finally, we give some examples of kernels such as B-spline kernels and the Blackman-Harris kernel to which the theory can be applied.
Reduction of Components in New Family of Diode Clamp Multilevel Inverter Ordeal to Induction Motor
Rathinam Angamuthu,Karthikeyan Thangavelu,Ramani Kannan 대한전자공학회 2016 Journal of semiconductor technology and science Vol.16 No.1
This paper describes the design and implementation of a new diode clamped multilevel inverter for variable frequency drive. The diode clamp multilevel inverter has been widely used for low power, high voltage applications due to its superior performance. However, it has some limitations such as increased number of switching devices and complex PWM control. In this paper, a new topology is proposed. New topology requires only (N-1) switching devices and (N-3) clamping diodes compared to existing topology. A modified APO-PWM control method is used to generate gate pulses for inverter. The proposed inverter topology is coupled with single phase induction motor and its performance is tested by MATLAB simulation. Finally, a prototype model has built and its performance is tested with single phase variable frequency drive.
A. Angamuthu,M. Sundaram,V. Balaji 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.3
These days FACTS devices are predominantly used to improve the power quality in distribution networks to meet the standards. The dynamic voltage restorer (DVR) plays a vital role in maintaining voltage in a distribution power substation at standard levels. DVRs can compensate a short period of sag or swell in a power network. Currently, many industries employ a servo-controlled voltage stabilizer at their premises to compensate voltage fluctuations and swells that occur for a longer period of time. Servo-controlled voltage stabilizers take about 20–30 power cycles to compensate fluctuation. The operation of sensitive equipment fails due to this inefficient compensation. This paper presents a solution for both voltage fluctuations and prolonged low voltage profiles at distribution networks. The proposed switching algorithm for the H-bridge inverter compensates grid voltage fluctuations by injecting compensating voltage without utilizing a DC bulk capacitor unlike a DVR. A prototype developed in the laboratory is tested experimentally and the obtained test results verify the extended feature of the proposed solution.
Tc-99 m Ubiquicidin Imaging in Orbital Aspergilloma: an Illustration
Meivel Angamuthu,Nishikant Damle,Dikhra Khan,Rachna Meel,Sanjay Sharma,Chandrasekhar Bal 대한핵의학회 2023 핵의학 분자영상 Vol.57 No.3
Aspergillus infection is relatively rare disease, and we present a case of orbital aspergillus infection who presented withright orbital pain and swelling. Right orbital lesion was identified on CT, MRI, and PET-CT imaging followed by confirmationof aspergillus on histopathological examination. We demonstrate that Tc-99 m ubiquicidin scan can yield positiveresults in aspergillosis too, enabling its differentiation from non-infective pathologies.
Pirabu Sakthivel,Alok Thakar,Arun Prashanth,Meivel Angamuthu,Suresh Chandra Sharma,Rakesh Kumar 대한핵의학회 2020 핵의학 분자영상 Vol.54 No.1
We present a case of a 16-year-old boy who underwent 68Ga-PSMA PET/CT for residual disease assessment of juvenile nasal angiofibroma. Positive uptake was noted in residual tumor on PET/CT imaging. However, there was no abnormal uptake in surrounding scar tissues as compared with contrast-enhanced magnetic resonance imaging. These findings were confirmed by biopsy from the scar tissue on posterior ethmoids. 68Ga-PSMA PET/CT may be a potentially valuable tool especially in distinguishing recurrences from surgical site reparative tissue and in planning and delivering stereotactic radiotherapy.
Rukmini Mridula Kandadai,Praveen Yada,Megha S. Uppin,Shaik Afshan Jabeen,Ajith Cherian,Meena Angamuthu Kanikannan,Rupam Borgohain,Sundaram Challa 대한신경과학회 2014 Journal of Clinical Neurology Vol.10 No.4
Background Subacute sclerosing panencephalitis (SSPE) is a delayed and fatal manifestationof measles infection. Fulminant SSPE is a rare presentation in which the disease progresses todeath over a period of 6 months. The clinical features are atypical and can be misleading. Case Report We report herein a teenage boy who presented with acute-onset gait ataxia followed by right hemiparesis that evolved over 1 month, with left-hemispheric, delta-range slowing on the electroencephalogram (EEG). Magnetic resonance imaging disclosed multiple whitematter hyperintensities, suggesting a diagnosis of acute disseminated encephalomyelitis. Hereceived intravenous steroids, and within 4 days of hospital admission he developed unilateralslow myoclonic jerks. Repeat EEG revealed Rademecker complexes, pathognomonic of SSPE,and an elevated titer of IgG antimeasles antibodies was detected in his cerebrospinal fluid. Thedisease progressed rapidly and the patient succumbed within 15 days of hospitalization. The diagnosis of SSPE was confirmed by autopsy. Conclusions This case illustrates the difficulty of recognizing fulminant SSPE when it manifests with asymmetric clinical and EEG abnormalities.
Orbital IgG4 Disease: Imaging Findings on 68Ga-DOTANOC PET/CT
Saurabh Arora,Nishikant A. Damle,Rachna Meel,Sanjay Sharma,Seema Sen,Chandrasekar Bal,Kanak Lata,Sneha Prakash,Divya Yadav,Meivel Angamuthu 대한핵의학회 2019 핵의학 분자영상 Vol.53 No.6
Immunoglobulin G4 (IgG4)–related diseases are a spectrum of systemic inflammatory conditions of unknown etiology, which are characterized by infiltration of tissues by IgG4 plasma cells and sclerosing inflammation (Cheuk and Chan Adv Anat Pathol 17:303–32, 2010). Although this condition was initially described in relation to autoimmune pancreatitis, now it has been reported in almost every organ system of body (Zen and Nakanuma Am J Surg Pathol 34:1812–9, 2010, Masaki et al. Ann Rheuma Dis 68:1310–5, 2009). Orbital involvement by IgG4 disease can involve extraocular muscles (EOM), lacrimal glands, conjunctiva, eyelids, infraorbital nerve, orbital fat, and nasolacrimal system (McNab and McKelvie. Ophthal Plast Reconstr Surg 31:167–78, 2015, Katsura et al. Neuroradiology 54:873–82, 2012). The basis of using 68Ga-DOTANOC PET/CT in IgG4 orbital disease is the known expression of somatostatin receptors in chronic inflammatory cells (Cuccurullo et al. Indian J Radiol Imaging 27:509-16, 2017) and also avidity shown previously in other IgG4-related diseases (Cheng et al. Clin Nucl Med 43:773-6, 2018).