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Isolation transformer

About: Isolation transformer is a research topic. Over the lifetime, 8145 publications have been published within this topic receiving 72396 citations.


Papers
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Proceedings ArticleDOI
19 Sep 2004
TL;DR: In this paper, a high performance bidirectional Cuk converter-based power supply is proposed to meet the essential requirements, such as high efficiency, low noise, and low EMI, which is achieved by integrating the magnetic components of the converter, the input inductors, the output inductor, and the isolation transformer.
Abstract: Telecommunication systems mainly need highly reliable power supplies with high efficiency. Other important issues are related to the noise and electromagnetic interference (EMI), which are produced by the power supply. Low EMI means low shielding cost and low distortion of the main communication signal. To meet such essential requirements, a high performance bidirectional Cuk converter-based power supply is proposed in this paper. The converter provides high efficiency, low noise, and low EMI. In addition, the converter has high power density, low cost, and electric isolation. These advantages are achieved from integrating the magnetic components of the converter, the input inductors, the output inductor, and the isolation transformer, on one magnetic assembly. In this paper, the conventional 42 VDC power supply architecture for telecommunication systems is briefly described. A modified system that utilizes the integrated magnetics bidirectional Cuk converter is explained. Finally, the full design integrated Cuk converter, simulation results, and practical performance evaluation are presented.

21 citations

Patent
20 Jun 1995
TL;DR: In this paper, an autotransformer with a ground connection coupled to the node between two secondary windings is used to enable the transmission of broadband analog CATV video signals on unshielded twisted wire pairs.
Abstract: Disclosed is a circuit which permits transmission of broadband analog CATV video signals on unshielded twisted wire pairs. The circuit includes an autotransformer with a ground connection coupled to the node between two secondary windings. The two opposite ends of the secondary windings are coupled to a choke, which, in turn, is coupled to an isolation transformer with a center-tapped primary and secondary winding for shunting any remaining common-mode currents.

21 citations

Proceedings ArticleDOI
26 Jul 2015
TL;DR: The Smart Transformer (ST) as discussed by the authors is a power electronics-based transformer that represents an enabling technology for providing new services to the Low Voltage (LV) and Medium Voltage (MV) grids.
Abstract: The Smart Transformer (ST), which is a power electronics-based transformer, represents an enabling technology for providing new services to the Low Voltage (LV) and Medium Voltage (MV) grid. The 3-stage configuration, with a high frequency transformer and 2 DC links, allows the electrical separation of the LV and MV grids. This leads to the independence of the two grids: any disturbance downstream and upstream can be compensated and mitigated by the ST action, which is the case of the unbalanced load condition of the LV grids. The unbalanced currents demanded by the loads could create unbalanced voltages at the LV side and also unbalanced currents at the MV side of a traditional transformer. This paper presents the improvements achieved by ST implementation in terms of voltage and current balancing: with a proper control of the ST, it provides balanced voltage in the LV grid, demanding a balanced current from the MV grid. This feature increases the power quality in both grids and provides an improved service to the customers.

21 citations

Proceedings ArticleDOI
22 Oct 2001
TL;DR: A dual two-level inverter fed open-end winding induction motor drive with novel PWM switching strategy aimed to suppress the zero sequence currents is proposed, without the need for harmonic filters and isolation transformers.
Abstract: A dual two-level inverter fed open-end winding induction motor drive is proposed in this paper. A total of 64 voltage space phasor combinations are possible in this scheme as each inverter produces eight voltage space phasors. The proposed scheme produces voltage space phasor locations similar to that of a 3-level inverter. In a 3-level inverter the series connected DC link capacitors carry the load current. This results in a fluctuating voltage space phasors, which is undesirable. Also, a 3-level inverter requires a bulky DC link capacitor. In the proposed scheme the DC link capacitor carries only the ripple current and hence the voltage space phasor fluctuations are absent. A novel PWM switching strategy aimed to suppress the zero sequence currents is also proposed in this paper, without the need for harmonic filters and isolation transformers.

21 citations

Patent
18 May 1949

21 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202313
202251
202144
2020151
2019211
2018266