Results 21 to 30 of about 7,856 (197)

THD and mucopexy: Efficacy and controversy

Annals of Medicine & Surgery, 2017
Transanal haemorrhoidal dearterialisation and mucopexy has evolved in recent years as a popular minimally invasive non-excisional surgery for symptomatic prolapsing haemorrhoids. The long-term outcome of this procedure however, remains to be established.
Abudeeb, Haytham, Ugwu, Ajogwu, Darabnia, Jamshid, Hammad, Ahmed, Khan, Khurram, Maung, Min, McNulty, Elizabeth, Khan, Abdul Latif, Mukherjee, Arijit   +8 more
openaire   +2 more sources

Coordinated control of active disturbance rejection and grid voltage feedforward for grid‐connected inverters

IET Power Electronics, EarlyView., 2022
This paper introduces the research on the inductance‐capacitor‐capacitor‐inductance grid‐connected inverter using active disturbance rejection and grid voltage feedforward coordinated control technology. The pade approximation is performed on the inductance‐capacitor‐capacitor‐inductance filter to derive the first‐order discretization mathematical ...
Guang‐Xin Zhong, Zhiteng Wang, Jiahua Zhou, Jian Li, Qingyu Su   +4 more
wiley   +1 more source

Power quality enhancement in asymmetrical cascaded multilevel inverter using modified carrier level shifted pulse width modulation approach

IET Power Electronics, EarlyView., 2022
New modified carrier‐based level shifted pulse width modulation approaches for single‐phase trinary dc source fed cascaded H‐bridge inverters are proposed in this article. In order to suppress the lower order harmonics, the carrier frequency is often tuned higher. However, switching and electromagnetic interference problems have a significant influence
Arun Vijayakumar, Albert Alexander Stonier, Geno Peter, Ashok Kumar Loganathan, Vivekananda Ganji   +4 more
wiley   +1 more source

Three-phase Active Tracking AC-AC Voltage Regulator based on Buck Converter with an Efficient Hybrid Control Technique

Düzce Üniversitesi Bilim ve Teknoloji Dergisi, 2022
This study proposes a switch-mode three-phase active tracking AC-AC voltage regulator based on the buck converter. The regulator topology incorporates a moderate number of components with less complexity and high efficiency.
Faruk Yalçın, Felix Hımmelstoss
doaj   +1 more source

A new symmetric modular eleven‐level inverter using single and double source unit for low voltage applications with reduced number of switches

IET Power Electronics, EarlyView., 2023
This study introduces a new modular multilevel inverter that can produce five levels of positive voltage using only six power switches and five DC voltage sources. The basic unit is composed of a single‐ and double‐source (SDS) unit. SDS reduces the number of power electronic components, such as the insulated gate bipolar transistors, freewheeling ...
Naser Fakhri, Sara Laali, Mohammad Salay Naderi, Hossein Rahimi, Saeid Gholami Farkoush   +4 more
wiley   +1 more source

Review of multiport modular multilevel converters for residential applications: A control perspective

IET Power Electronics, EarlyView., 2023
Here, multiport modular multilevel converter (MPMMC) topologies will be reviewed and analysed from a control standpoint. It does this through identifying feasible MPMMC topologies, developing review criteria and then reviewing the feasible topologies.
Stephan Adams, Dezso Sera, Geoffrey Walker, Mark Broadmeadow   +3 more
wiley   +1 more source

THD Analysis in Closed-Loop Analog PWM Class-D Amplifiers [PDF]

Journal of Electrical and Computer Engineering Innovations, 2014
In this paper, we investigate the parameters affecting Total Harmonic Distortion (THD) and Power Supply Rejection Ratio (PSRR) in PWM Class D Amplifiers (CDAs) on the basis of linear models with feedback.
P. Amiri, M. Kohestani, M. Seifouri
doaj   +1 more source

Special conditions in the treatment of hemorrhoidal disease. The advantages of THD-RAR in the treatment of hemorrhoidal disease in these situations [PDF]

Romanian Medical Journal, 2020
Introduction. The prevalence of hemorrhoids in the general population ranks first among benign anorectal diseases. In the last 20 years, however, the number of cases operated for hemorrhoidal disease has decreased and consequently the experience of ...
Romica Mehic, Veronica Indreica, Vasilica Marcu, Mircea Beuran, Alexandru Laurentiu Chiotoroiu   +4 more
doaj   +1 more source

A nine‐level T‐type inverter (9L‐TTI) with voltage boost capability

IET Power Electronics, EarlyView., 2023
A new multi‐level inverter topology with boosting feature considering the reduced switch count has been presented, compared and validated. Abstract This paper introduces a 9L T‐type boost inverter (9L‐TTI) based multilevel topology, which generates a nine‐level output voltage in the boost mode.
Zarren Firdous, Saad Mekhilef, Nidhi Mishra, Asif Mustafa, Mehdi Seyedmahmoudian, Alex Stojcevski   +5 more
wiley   +1 more source

Dual source novel nine level inverter (DSN2LI) design with minimum active devices and inherent polarity generation

IET Power Electronics, EarlyView., 2023
This article presents a dual‐source novel nine‐level inverter (DSN2LI) featuring minimal devices. Utilizing eight switches, which include 2 bidirectional switching devices and 2 uneven dc links, the proposed DSN2LI generates nine levels. The DSN2LI employs the utilization of trinary geometric DC links.
Arun Vijayakumar, Albert Alexander Stonier, Geno Peter, Vivekananda Ganji   +3 more
wiley   +1 more source