A new interleaved high step‐down converter with wide range of soft switching

Author(s):  
Rouhollah Khorami ◽  
Majid Delshad ◽  
Hadi Saghafi
Keyword(s):  
2019 ◽  
Vol 34 (10) ◽  
pp. 9828-9843 ◽  
Author(s):  
Liangzong He ◽  
Jiazhe Chen ◽  
Xinyong Xu ◽  
Bing Cheng ◽  
Jiaqing Sun ◽  
...  

2021 ◽  
Vol 136 (2) ◽  
pp. 143-147
Author(s):  
Victor Badner ◽  
Mana Saraghi

The first few months of the coronavirus disease 2019 (COVID-19) pandemic challenged health care facilities worldwide in many ways. Inpatient and intensive care unit (ICU) beds were at a premium, and personnel shortages occurred during the initial peak of the pandemic. New York State was the hardest hit of all US states, with a high concentration of cases in New York City and, in particular, Bronx County. The governor of New York and leadership of hospitals in New York City called upon all available personnel to provide support and patient care during this health care crisis. This case study highlights the efforts of Jacobi Medical Center, located in the northeast Bronx, from March 1 through May 31, 2020, and its use of nontraditional health care personnel, including Department of Dentistry/OMFS (Oral and Maxillofacial Surgery) staff members, to provide a wide range of health care services. Dental staff members including ancillary personnel, residents, and attendings were redeployed and functioned throughout the facility. Dental anesthesiology residents provided medical services in support of their colleagues in a step-down COVID-19–dedicated ICU, providing intubation, ventilator management, and critical and palliative care. (Step-down units provide an intermediate level of care between ICUs and the general medical–surgical wards.) Clear communication of an acute need, a well-articulated mission, creative use of personnel, and dedicated staff members were evident during this challenging time. Although not routinely called upon to provide support in the medical and surgical inpatient areas, dental staff members may provide additional health care personnel during times of need.


Author(s):  
V. Ramesh ◽  
Y. Kusuma Latha

In this paper, Zero-Voltage-Transition (ZVT) two-cell interleaved boost Power Factor Correction (PFC) converter for voltage source Inverter (VSI) fed permanent magnet brushless DC motor (PMBLDCM) drive has been proposed Scheme reduce the torque ripple of BLDC motor drive and also reduce the switching losses of VSI for Which an auxiliary circuit is designed and added to the interleaved boost converter.  For achieving soft switching, only one switch is used in auxiliary circuit which reduces the torque ripple and switching losses. In this proposed control strategy, the DC link voltage is controlled with interleaved boost converter which is proportional to the desired speed of the BLDC motor. In this paper, six switch and four switch VSI is also implemented with interleaved boost converter topology. A comparison is made between the six switch and Four Switch VSI fed PMBLDC Motor drive and Torque Analysis as been done. To validate the proposed work, results are presented. The results showed that proposed converter control strategy operating under soft switching mode improves the efficiency of the drive system with PFC feature in wide range of the speed control.


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