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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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Journal ArticleDOI
S. Moisseev1, Koji Soshin1, Shinji Sato1, L. Gamage1, Mutsuo Nakaoka1 
08 May 2004
TL;DR: In this paper, the authors presented a novel circuit topology of the voltage source type zero voltage soft-switching (ZVS) full bridge DC-DC power converter with an isolated high-frequency transformer, which incorporates zero-current soft switching (ZCS) phase-shifted (PS)-PWM active power switches in series with diodes of two bridge arms of a full-bridge rectifier on the highfrequency transformer secondary side.
Abstract: This paper presents a novel circuit topology of the voltage source type zero voltage soft-switching (ZVS) full bridge DC-DC power converter with an isolated high-frequency transformer, which incorporates zero-current soft-switching (ZCS) phase-shifted (PS)-PWM active power switches in series with diodes of two bridge arms of a full-bridge rectifier on the high-frequency transformer secondary side. This high-frequency linked DC-DC power converter can achieve ZVS for noncontrolled active power switches on the primary side of the transformer and ZCS for PS-PWM active switches on the secondary side of the transformer under wide load variations as well as a wide PS-PWM regulation range. The switching power losses and conduction power losses of the active devices of the proposed DC-DC converter can be considerably reduced. The proposed DC-DC converter blocks circulating current flowing through the semiconductor switching devices on the transformer primary side as compared to the lossless snubbing capacitor and transformer leakage and magnetising inductor-assisted soft-switching full-bridge DC-DC converter with ZVS PS-PWM scheme on the transformer primary side. The steady-state operating principles of the proposed DC-DC converter are evaluated and discussed, based on the simulation and experimental results obtained from a 2 kW-40 kHz breadboard set-up using IGBTs.

27 citations

Patent
13 Mar 2013
TL;DR: In this paper, a controller is configured to determine from a transformer secondary signal whether the transformer comprises a magnetic transformer or an electronic transformer, and select a compatibility mode of operation from a plurality of modes of operation.
Abstract: An apparatus may include a controller to provide compatibility between a load and a secondary winding of a transformer driven at its primary winding by a dimmer, wherein the controller is configured to: determine from a transformer secondary signal whether the transformer comprises a magnetic transformer or an electronic transformer; and select a compatibility mode of operation from a plurality of modes of operation based on the determination of whether the transformer comprises a magnetic transformer or an electronic transformer. A method for providing compatibility between a load and a secondary winding of a transformer driven at its primary winding by a dimmer may include determining from a transformer secondary signal whether the transformer comprises a magnetic transformer or an electronic transformer and selecting a compatibility mode of operation from a plurality of modes of operation based on the determination of whether the transformer comprises a magnetic transformer or an electronic transformer.

27 citations

Patent
08 Nov 1990
TL;DR: In this article, an electrical data filter is provided for reducing noise reception and generation for data signal which is transmitted differentially on two conductors constituting the twisted-pair cable.
Abstract: An electrical data filter is provided for reducing noise reception and generation for data signal which is transmitted differentially on two conductors constituting the twisted-pair cable. The data filter includes an in-line transformer and a shunt transformer. The in-line transformer has a winding (i.e. the primary or secondary) in series with each line of the twisted pair. These windings are arranged so that they are wound in the same direction. Similarly, the shunt transformer includes a winding which shunts each wire of the twisted pair to ground through a series capacitor. These shunt windings are wound in opposite directions to each other.

27 citations

Patent
11 Jul 2008
TL;DR: In this article, the authors proposed an isolating transformer consisting of at least a first and a second transformer core (28), a transformer coil (33) on a circuit board around a branch (27) of the transformer core on the high voltage side, and an intermediate coil (36) encircling at least one branch of each said at least two transformer cores.
Abstract: Sensor for measuring electrical parameters in a high voltage environment comprising a high voltage side (4) for connection to high voltage conductors, a low voltage side (6) for connection to low voltage power supply and measurement signal control circuitry, a measurement signal circuit (16), and a power supply circuit (14), and at least one isolating transformer (18, 20) for transmission of electrical power supply and/or measurement signals between the low voltage side and the high voltage side. The isolating transformer comprises at least a first and a second transformer core (28), a transformer coil (33) on a circuit board around a branch (27) of the transformer core on the high voltage side and a transformer coil (32) on a circuit board around a branch (29) of the transformer core on the low voltage side, the isolating transformer further comprising an intermediate coil (36) encircling at least one branch of each said at least two transformer cores.

27 citations

Proceedings ArticleDOI
17 Jun 2001
TL;DR: In this paper, a high frequency and high voltage pulse transformer is designed, fabricated, and tested, and results of various parameters such as transformer loss, temperature rise, leakage inductance, distributed capacitance, and hysteresis characteristics are discussed in detail.
Abstract: Summary form only given, as follows. In designing a compact and high efficiency TWT microwave amplifier, the role of a high power density DC power supply is very important. In order to reduce volume of the power supply, it is necessary to increase switching frequency of the power supply. The high operation frequency mainly reduces transformer volume in the power supply. However, a step-up ratio of the transformer in the high voltage DC power supply needs to be maintained. Therefore, the pulse transformer should be carefully designed to fulfill its function in the power supply. A high frequency and high voltage pulse transformer is designed, fabricated, and tested. Switching frequency of the transformer is 100 kHz. Input and output voltages of the transformer are 250 V and 4 kV, respectively. Normal operation power of the transformer is 3.3 kW. Maximum volume of the transformer is 400cm/sup 3/. The transformer will be installed in a metal box that has nominal operation temperature of 85 degree centigrade. The transformer and other high voltage components in the box will be molded with Silicon RIV that has a very low thermal conductivity. Procedure of design and test results will be presented. Results of various parameters such as transformer loss, temperature rise, leakage inductance, distributed capacitance, and hysteresis characteristics will be discussed in detail. In addition, thermal analysis results from ANSYS code for three different operation conditions will be discussed.

27 citations


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