• Title/Summary/Keyword: Transformer

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Design of Clustering CoaT Vision Model Based on Transformer (Transformer 기반의 Clustering CoaT 모델 설계)

  • Bang, Ji-Hyeon;Park, Jun;Jung, Se-Hoon;Sim, Chun-Bo
    • Proceedings of the Korea Information Processing Society Conference
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    • 2022.05a
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    • pp.546-548
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    • 2022
  • 최근 컴퓨터 비전 분야에서 Transformer를 도입한 연구가 활발히 연구되고 있다. 이 모델들은 Transformer의 구조를 거의 그대로 사용하기 때문에 확장성이 좋으며 large 스케일 학습에서 매우 우수한 성능을 보여주었다. 하지만 Transformer를 적용한 비전 모델은 inductive bias의 부족으로 학습 시 많은 데이터와 시간을 필요로 하였다. 그로 인하여 현재 많은 Vision Transformer 개선 모델들이 연구되고 있다. 본 논문에서도 Vision Transformer의 문제점을 개선한 Clustering CoaT 모델을 제안한다.

Design technology by structure of transformer (변압기의 형태에 따른 설계기술)

  • Lee O.K.;Song H.S.
    • Proceedings of the KIPE Conference
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    • 2003.07a
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    • pp.313-316
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    • 2003
  • Investigated about topology of each component of transformer and material choice method and property in this paper. Component of transformer is bobin, winding, insulating paper, Varnish etc. And, experiment and investigated special quality by primary winding of transformer and composition of secondary winding. Investigated loss of transformer and EMI decrease method. Investigated method to select winding size that consider frequency.

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The Characteristic Analysis and Design of Transformer for LCD Backlight Inverter (LCD 구동 Backlight Inverter용 변압기의 설계 방법과 특성 분석)

  • Kim, Youn-Hyun
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.55 no.7
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    • pp.353-361
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    • 2006
  • This paper presents the design scheme of transformer for backlight inverter and discuss the characteristics related to its design, including driving inverter. A few studies have so far been made at design and characteristics analysis of transformer. Therefore, this paper manages the presentation of the advisable design methodology of transformer for backlight inverter supplying CCFL. To verify the proposed method, this paper accomplishes the analysis by FEM coupled with circuit and finally shows that the proposed design method is very useful.

Analytic Design of a Ferroresonant Transformer for Microwave Heating System (초고주파 가열장치에 사용하는 철공진 변압기의 해석적 설계)

  • 나정웅;김원수
    • 전기의세계
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    • v.28 no.1
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    • pp.53-58
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    • 1979
  • In the microwave heating system, a ferroresonant transformer is used to regulate the magnetron power fluctuation. For the simplification, nonlinear characteristics of the transformer and the magnetron are idealized to be piecewise linear. Dipped peak shape of the magnetron current is explained qualitatively by considering the fundamental and third harmonic frequency components in the circuit. Design equations providing the values of the leakage inductance, turn ratio of the transformer and the capacitance are derived analytically by cosnidering the fundamental frequency component only. The ferroresonant transformer is designed to obtain a required regulation and high input power factor from the derived design equations, and analytical calculations are compared with experimental measurements.

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The fault analysis of transformer to develope protective relaying algorithm for transformer (변압기보호계전 알고리즘 개발을 위한 변압기의 고장해석)

  • Suh, Hee-Seok;Shin, Myong-Chul
    • Proceedings of the KIEE Conference
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    • 1996.07b
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    • pp.844-846
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    • 1996
  • This paper deals with a simulation method of faults in a power transformer. Using the [R],[L] matrix supplied by the auxiliary routine of EMTP called BCTRAN, the turn to ground fault and turn to turn fault are simulated and the inrush condition is simulated using saturable transformer model. Data from simulations can be used to identify the response of the digital protection algorithms for transformer.

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Special quality analysis by component type choice of transformer (변압기의 구성요소 선정에 따른 특성고찰)

  • Lee, O.K.;Kim, S.Y.
    • Proceedings of the KIEE Conference
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    • 2003.07c
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    • pp.1601-1603
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    • 2003
  • Investigated about topology of each component of transformer and material choice method and property in this paper. Component of transformer is bobin winding, insulating paper, Varnish etc. And experiment and investigated special quality by primary winding of transformer and composition of secondary winding. Investigated loss of transformer and EMI decrease method. Investigated method to select winding size that consider frequency.

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A Study on the Cooling Characteristic of a 154kV Less-Flammable Power Transformer (154kV 방재형 난연 변압기 냉각특성에 관한 연구)

  • Park, J.H.;Oh, W.K.;Ha, Y.S.
    • Proceedings of the KIEE Conference
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    • 2001.10a
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    • pp.61-64
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    • 2001
  • Demand for development of 154kV Less-Flammable Power transformer is now increasing greatly instead of a oil-immersed transformer for preventing disasters and Less-flammability of substations. The most important point in developing Less-flammable transformer is cooling system. This paper describes the study on cooling characteristic of Less-flammable transformer.

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A Study on the Effects of Exitation Voltage Waveforms on the Performances of Parametric Transformer (여자전압의 파형에 따른 Parametric Transformer의 특성)

  • Woo, Jung-In;Jung, Kee-Wha
    • Proceedings of the KIEE Conference
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    • 1992.07b
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    • pp.706-709
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    • 1992
  • This paper deals with the operation of a parametric transformer through the normalization of system equations. Based on these equations, the effects of excitation voltage waveforms on the performances of the parametric transformer are analyzed.

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Analysis on Current Limiting Characteristics of Flux-Lock Type SFCL Using a Transformer Winding (변압기 권선을 이용한 자속구속형 초전도 전류제한기의 전류제한 특성 분석)

  • Han, Tae-Hee;Lim, Sung-Hun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.24 no.2
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    • pp.136-140
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    • 2011
  • The fault current limiting characteristics of the flux-lock type superconducting fault current limiter (SFCL) using a transformer winding were investigated. The suggested flux-lock type SFCL consists of two parallel connected coils on an iron core and the transformer winding connected in series with one of two coils. In this SFCL, the high-TC superconducting (HTSC) element was connected with the secondary side of the transformer. The short-circuit experimental devices to analyze the fault current limiting characteristics of the flux-lock type SFCL using the transformer winding were constructed. Through the short-circuit tests, the flux-lock type SFCL using transformer winding was shown to perform more effective fault current limiting operation compared to the previous flux-lock type SFCL without the transformer winding from the viewpoint of the quench occurrence and the recovery time of the HTSC element.

Forward Converter Using 300W Planar Transformer (300W 평면 변압기적용 포워드 컨버터)

  • Choi, S.H;Park J.Y;Kim E.S
    • The Transactions of the Korean Institute of Power Electronics
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    • v.9 no.6
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    • pp.560-567
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    • 2004
  • In this paper, the design and implementation of a high power(300W) forward converter using a planar transformer is presented. The overall size and volume of the converter is decreased by replacing a planar transformer in stead of using a conventional winding transformer. Due to the decreased size and volume, power density of the applied forward converter is increased. Also, in this paper, the 300W ZVS forward converter with active clamp snubber circuit is compared to the 300W hard switching forward converter planar transformer, the decreased size and volume, the 300W ZVS forward converter with active clamp snubber circuit, 30W hard switching forward converter.