• Title/Summary/Keyword: Transformer design

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Design of a Force Applying System for a Smart-phone Curved Glass Molding System and Its Characteristic Test (스마트폰 곡면유리 성형시스템의 가압장치 설계 및 곡면유리 성형특성실험)

  • Kim, Hyeon-Min;Hong, Tae-Kyung;Jung, Dong-Yean;Lee, Yeon-Hyeong;Park, Jea-Hyun;Kim, Gab-Soon
    • Journal of Institute of Control, Robotics and Systems
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    • v.20 no.5
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    • pp.570-577
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    • 2014
  • This paper describes the design of a force applying system for a smart phone curved glass molding system and its characteristic test. The force applying system is composed of a motor and gear, a rectilinear movement structure, a force sensor, an LVDT (Linear Variable Differential Transformer) sensor, an up and down moving block, and so on. The system precisely controls the applying force and time to the plane glass because the glass can be easily destroyed under applied force, and can be bent imperfectly. As a result of the characteristic test, the curved glass can be manufactured using this system, and the holding time under 0N force, the applying force to the plane glass, the time for applying from 0N to maximum force, and the holding time under maximum force at the manufacture feasible temperature $620^{\circ}C$ were found.

High Efficiency Resonant Asymmetrical Half-Bridge Flyback Converter (고효율 공진형 비대칭 하프브리지 플라이백컨버터)

  • Jeong, Gang-Youl;Yoo, Doo-Hee
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.24 no.4
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    • pp.81-94
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    • 2010
  • This paper presents a high efficiency resonant asymmetrical half-bridge flyback converter. The primary half-bridge circuit of the converter operates by a soft-switching type using the asymmetrical pulse-width modulation (PWM) method with the resonant capacitance and transformer leakage inductance. The secondary flyback circuit of the proposed converter utilizes a synchronous rectifier, which operates by a new voltage-driven method with a simple drive circuit. Thus the proposed converter improves the total efficiency. This paper explains the operational principle of the proposed converter by each mode and shows the converter design consideration and a design example for the prototype converter, respectively. After that, the proposed simple driving technique of the synchronous rectifier by a voltage-driven method is explained, briefly. The designed prototype converter has wide input voltage (AC $V_{in,rms}$=75~265[V]), 5[V] DC output voltage, and 100[W] output power. To verify the excellent performance of the proposed converter, the designed prototype is implemented and experimented. The good performance of the proposed converter is shown through the experimental results.

Design of outside orbit style supersonic waves multi curer for Fracture patient's type (radish stimulation, radish invasion) rehalibitation promotion) (Fracture 환자의 유형(무자극, 무침습) 재활촉진을 위한 외부궤도형 초음파 다층치료기의 설계)

  • Kim Whi-Young
    • Journal of the Korea Computer Industry Society
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    • v.7 no.3
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    • pp.245-252
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    • 2006
  • Estrangement hierarchical by bipolarization is deepened and time space that social welfare by graying corresponds great so. Specially, is real condition that indifference by patient's increase which is solitary life string is come to involve by social Voblem. Together, Jaetaek bone fracture patient's ratio is zooming. <중략>Supersonic waves operation frequency used on both end because do 1mHz, 1.3mHz, supersonic waves origination that have 1.5mHz's Piezo-ceramic crystal tranducer material each 4 premature senilitys in this research, and outside diameter according to impedance and Phase d used Gakgak4mm, 5.4mm, Dukke0.5mm, transformer deuce of length 70mm. Manufactured, and investigated supersonic waves distribution chart by capacity 50m W. Supersonic waves used by diagnosis mainly but is seen to become convenient medical treatment mounting in bone fracture patient's treatment if supplement clinically. If supplement system furthermore, is going to apply to osteoporosis patient, and this research tried to design poetic theme width directly and study rain standardization special qualify and approach basic form because do modelling.

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A Study on the LCC Type High Frequency DC/DC Converter for Contactless Power Supply System (비접촉 전원장치에 적용한 LCC형 고주파 공진 DC/DC 컨버터에 관한 연구)

  • Kim, Dong-Hee;Hwang, Gye-Ho
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.21 no.6
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    • pp.55-64
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    • 2007
  • This paper represents characteristics and design example of series loaded LCC type high frequency resonant DC-DC converter with variable parallel capacitor in the secondary side of inductive power transformer. In this converter, ZVS(zero voltage switching) technique is applied to reduce turn-off switching losses, and the applied converter used the PFM switching pattern to control output voltage. The operating characteristics of the proposed converter is analyzed using nomalized parameter such as switching frequency and load factor with varing the secondary parallel resonant capacitor. The results of analysis show the operating characteristics and design method of the proposed converter using characteristic values. And the proposed converter can be applied for the contactless power supply with linear transfer system such as dean room facilities of semiconductor and Flat Panel Display.

Design of TE10 to TEM mode convertor for W-band radial power combiner (W밴드 radial 전력 결합기용 TE10-TEM 모드 변환기 설계)

  • Young-Gon Kim;Myung-Hun Yong;Han-Chun Ryu;Se-Hoon Kwon;Seon-Keol Woo
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.23 no.6
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    • pp.41-46
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    • 2023
  • Design of W-band TE10 to TEM mode converter for radial power combiner is proposed in this paper. The proposed structure is used with generally available pin to realize TEM mode and is designed to convert TE10 to TEM mode gradually using 2-step impedance transformer and back short. The pin of proposed mode converter is well bonded to the housing so that environment conditions such as vibration or shock are not affected. The proposed mode converter, in a back-to-back configuration, has less than 1.55 dB insertion loss and more than 10 dB return loss from 92.5 GHz to 97.7 GHz. Proposed converter is expected compact radar and various applications requiring for high power and stable environment conditions.

Design of W-band 12-way radial power combiner (W-밴드 12-way radial 전력 결합기 설계)

  • Young-Gon Kim;Hyo-Chul Kim;Heung-Rae Cho;Han-Chun Ryu;Se-Hoon Kwon;Seon-Keol Woo
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.24 no.3
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    • pp.21-26
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    • 2024
  • Design and fabrication method of W-band 12-way radial power combiner is proposed in this paper. The proposed structure is used with TE10 to TEM mode converter, which is realized using 2-step impedance transformer. The pin structure for mode converter is well bonded to the housing so that environment conditions such as vibration or shock are not affected. Proposed W-band power combiner has less than 0.7 dB insertion loss and more than 13 dB return loss from 88 GHz to 98 GHz. The measured output isolations between each other are greater than 7.5 dB from 82 to 100 GHz and phase differences are less than 10 degree from 88 to 96 GHz. Proposed power combiner is expected compact radar and various applications requiring for high power and stable environment conditions.

The Characteristics Analysis and Design of High-Frequency Isolated Type ZVZCS PS-PWM DC-DC Converter with Fuel Cell Generation System (연료전지 발전시스템에 적용된 고주파 절연형 ZVZCS PS-PWM DC-DC 컨버터의 설계 및 특성 해석)

  • Suh, Ki-Young;Mun, Sang-Pil;Kim, Dong-Hun;Lee, Hyun-Woo;Kwon, Soon-Kurl
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.20 no.4
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    • pp.21-28
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    • 2006
  • In this paper, the proposed full-bridge high frequency isolated zoo voltage and zero current switching phase shifted pulse width modulation(ZVZCS PS-PWM)DC-DC converter among fuel cell generation system consist of 1.2[kW] fuel cell of Nexa Power Module, full-bridge DC-DC converter to boost the fuel cell low voltage($28{\sim}43[%]$) to 380[VDC] and a single phase full-bridge inverter is implemented to produce AC output(220[VAC], 60[Hz]). A tapped inductor filter with freewheeling diode is newly implemented in the output filter of the proposed full-bridge high frequency isolated ZVZCS PS-PWM DC-DC converter to suppress circulating current under the wide output voltage regulation range, thus to eliminate the switching and transformer turn-on/off over-short voltage or transient phenomena. Besides the efficiency of $93{\sim}97[%]$ is obtained over the wide output voltage regulation ranges and load variations.

Pulsed Laser System of Ultra-scan Way for Uterus Rehabilitation Treatment (자궁 재활치료를 위한 울트라-스캔 방식의 펄스형 레이저시스템)

  • Kim, Whi-Young
    • The Journal of the Korea Contents Association
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    • v.9 no.6
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    • pp.256-265
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    • 2009
  • Laser output becomes output adjustment from 20 w to 100 w consecutively and time of exposure is available adjustment through water plant in 0.01 seconds. Pulse action can intercept laser beam periodically and supermarket pulse 0.1 $\sim$ between 1ms discharge consist and momentary laser output is increased to 5 $\sim$ 10. Specially, that must remove malignancy cell in womb nine escarps in the case of uterine cancer first of all stability of tube output about pulse by weight very, stable soft switching action area is defined without high frequency transformer leakage inductance ($L_1$) increase and additional series inductor insertion to converter the first main circuit securing zero voltage and marks of switching action in this research specially, because circulation current path of inductor ($L_f$) current is intercepted, converter the first main circuit switching component and spiritual enlightenment damage of high frequency transformer take decreasing greatly and high frequency the second stoppage department ($D_5,\;D_6$) becomes soft switching, and also, switching damage absorption quantity characteristic that can come to life again as subordinate have, and to become tube stabilization design and result that manufacture and experiment, brought result that improve of 10% than existing equipment, and if supplement as systematic late, it becomes thought to get into superior result.

Design and Fabrication of Aperture-Coupled Microstrip Patch Antenna for WLL Repeater Using Space Diversity (공간 다이버시티를 이용한 WLL 중계기용 적층형 평판 안테나 설계 및 제작)

  • 한봉희;노광현;박노준;강영진
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.27 no.4B
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    • pp.388-396
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    • 2002
  • In this paper, An aperture-coupled microstrip patch antenna operating at WLL frequency range(Rx : 2.3∼2.33Ghz, Tx : 2.37 ∼2.4Ghz) for WLL repeater is designed and fabricated. FR-4 epoxy substrate with 4.7 relative permittivity is inserted between feed-line and patch plane. Aperture-coupled structure is employed for consideration of bandwidth improvement and gain\`s characteristics. Air gap is arranged at each layer for bandwidth extension and radome is used as a protector in the upper patch. In this paper, both 1 port and 2 port are designed as 1$\times$2 array antenna which uses T-junction and λ$\_$g//4 transformer. Here, 1 port is used as transmitting/receiving antenna and 2 port is used as receiving antenna. Functionally independent two antennas using space diversity arrange slots between two antennas in order to be placed at the same place. As a result, we obtained a excellent isolation below -40dB and return loss is reduced by means of slots arrangement between patch and antenna.

A Study on Quality Improvement of Electrical Master Box for KUH (한국형 기동헬기 전원분배 제어장치의 품질 향상에 관한 연구)

  • Kim, Young Mok;Jun, Byung Kyu;Jeong, Sang Gyu;Lee, Joo Hyung
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.45 no.1
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    • pp.71-78
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    • 2017
  • The electrical power system of Korean Utility Helicopter(KUH) is designed as a dual control system to enhance the system safety of aircraft and each system is installed separately at left and right of the aircraft. The system is composed of 2 AC generators, 1 APU generator, 2 Transformer Rectifier Units(TRU), AC/DC Electrical Master Box(AC/DC EMB). The AC/DC EMB, consists of 2 AC EMB and 2 DC EMB, is essential equipment which supply and distribute electric power to the aviation electronics and electrical equipment of KUH. There were defects caused by internal short circuit in AC EMB during the first production phase of the KUH. This paper describes the analysis of the defects, troubleshooting process, root cause, and the solution by design change.