• Proceedings of the KIPE Conference
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• 2014.07a
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• pp.161-162
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• 2014

본 논문에서는 스탠바이 컨버터를 가지는 전력 변환 시스템에서 경부하 효율을 높일 수 있는 새로운 게이트 구동기법을 제안한다. 제안 방법은 스탠바이 컨버터의 보조 출력 전압을 조절하여 전력 MOSFET의 구동 전압 및 제어기 IC의 동작 전압을 경부하 조건에서 낮춘다. 따라서, MOSFET의 게이트 구동 손실과 제어기 IC의 손실을 크게 줄일 수 있다. 본 논문에서는 48V 입력전압 및 12V 출력전압/60A 출력전류의 주전원단 및 5V/3A의 출력의 스탠바이 전원단을 포함한 DC/DC 서버용 전원 장치를 실험하여 타당성을 검증하였다.

• Proceedings of the KIPE Conference
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• 2014.07a
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• pp.179-180
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• 2014

서버용 전원장치는 경부하 조건에서의 효율이 점점 강조되고 있다. 이를 만족하기 위해 LLC 공진형 컨버터는 많이 사용되고 서버용 전원장치에서 요구되는 홀드-업 시간을 만족하기 위하여 넓은 입력 전압 범위에서 동작 가능하게 설계되어 있다. 이는 컨버터의 1차측 도통 손실과 턴-오프 스위칭 손실을 증가시켜 정상상태의 효율을 감소시킨다. 본 논문에서는 변압기의 보조 권선을 포함한 제어 회로를 통해 변압기의 인덕턴스를 변경하는 방식을 하프브리지 LLC 공진형 컨버터에 적용함으로써 정상 상태에서는 높은 자화인덕턴스를 적용하고 홀드-업 시간에서 낮은 자화인덕턴스를 적용하여 각각의 상태에서 요구되는 고효율과 최대 전압이득을 모두 만족 한다. 실험을 통해 제안된 방식의 유용성을 검증한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.11a
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• pp.1284-1287
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• 2012

본 논문에서는 트레드밀의 전원공급을 보조하는 압전소자를 이용한 자가발전형 트레드밀을 제안한다. 이를 위해 기존 트레드밀의 발판을 압전소자 발판으로 교체하고, 트레드밀의 발판에 발전된 전기를 저장하기 위한 충전지를 두며, 해당 발판의 압전소자를 이용하여 트레드밀에 재사용 할 수 있는 전원을 생산한다. 본 연구 결과로 트레드밀의 구동전력효율의 향상을 기대할 수 있다.

• Journal of the Institute of Electronics and Information Engineers
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• v.50 no.11
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• pp.58-63
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• 2013

This paper presents a transceiver design for DisplayPort interface using an optical channel. By converting the electronic channel to the optical channel, the DisplayPort's main channel can provide a high-speed data transmission for long distance. The design converting the electronic channel to the optical channel in the main channel and AUX channel of the DisplayPort is presented in this paper. Futhermore, the HPD signal transmission by using AUX channel is proposed. In order to minimize power consumption, this paper also proposed a method of controlling the TX block in the main link. The proposed system is designed by a FPGA and an optical module. The FPGA used 651 ALUT(adaptive look-up table)s, 511 resisters and 324 block memory bits. The maximum operating rate of the FPGA is 250MHz. With the proposed power control scheme, 740mW of power dissipation reduction can be achieved at the main link optical TX module.

• Journal of Industrial Convergence
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• v.22 no.7
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• pp.15-21
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• 2024

A hiking stick is generally one of the walking aids that allow hikers to walk while relying on their own bodies when walking. A rechargeable battery must be built into the hiking stick, which is an auxiliary device, in order to perform various functions. A separate power supply is required to charge the rechargeable battery. This study is about a self-generated power supply and develops a power generation device using a screw with higher power generation efficiency than the existing method. It is differentiated from the method suggested in this study by comparing and analyzing it with the existing power generation method, and identifying problems therewith. The screw-type power generation device generates power when the climbing stick comes into contact with the ground and when it is separated from the ground. The built-in power generation device does not require a separate power supply, and it can be used by attaching the role of a mobile phone auxiliary battery and a lighting lamp, and it has the effect of being able to find it through location tracking by embedding a GPS sensor, etc., and using lighting to keep the user safe in emergency situations such as distress. The existing generator with built-in mountain climbing stick is difficult to charge due to very weak current and low practicality, but the generator developed in this research could achieve high efficiency to obtain a sufficient current, so it is possible to charge a battery and practicality.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2009.10a
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• pp.239-242
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• 2009

Power Control and Distribution Unit (PCDU) plays roles of power generation control for solar array panel, power storage control for battery system, power conversion for unregulated and regulated primary bus and power distribution to bus and payload system. The selection and design of the proper auxiliary power interface for PCDU depending on various mission is one of the most important step for electrical power subsystem design. In this paper, the general design approach of auxiliary power interface for PCDU which can be used for small-sized LEO satellites application is given. And, the auxiliary power design concept for always alived modules such as solar array regulator and house keeping module is also suggested.

• Proceedings of the KIPE Conference
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• 2007.11a
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• pp.47-49
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• 2007

For the magnetron, two kinds of auxiliary power is required to generate proper heat and electromagnetic field. In this paper the development of filament power supply and magnet power supply for high power industrial magnetron is studied. The filament power supply which is generate proper heat, even it doesn't require high power like main power supplies, has many consideration such as high voltage insulation and power control coordinated with high voltage cathod current to maintain constant heat generation. The novel control method using constant resistance control is proposed for accurate control of filament power supply.

• Proceedings of the KSR Conference
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• 2004.06a
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• pp.1440-1443
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• 2004

In this paper, to assess and enhance the reliability of Korea High Speed Train, auxiliary power is selected and reliability analysis is carried out. The auxiliary power system is classified into subsystems and functional analysis is conducted. Reliability block diagrams are drawn. and reliability parametric analysis is performed. Analysis results show that the reliability of auxiliary power system depends on critical items. To grow the system reliability, activities have been concentrated on improvement of critical items and the results were successful.

• Journal of the Korean Society for Railway
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• v.9 no.5 s.36
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• pp.612-617
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• 2006

As the on-board electric devices determine the performances of vehicles, production of reliable devices is important. To keep the reliability of devices constant, management of performance evaluation of the on-board devices is crucial. Because temperature has a serious effect on failures of the components of the devices, its measurement is the first step for good management. In this study, we described performance characteristics of domestic auxiliary block developed through G7 project. We measured the performances of auxiliary block during test running by the developed on-line measurement system. After we save the input real-time data from each signal of Korean High Speed Train through the network line, we can acquire necessary information through post-processing program. We verify the motor block characteristics of Korean High Speed Train by this system.

• Proceedings of the Safety Management and Science Conference
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• 2003.11a
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• pp.335-343
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• 2003

In the electrode fabrication of unit cell, it was ascertained that electrochemical characteristics were greatly increased with 90 wt.% of BP-20, 5 wt.% of Super P and 5 wt.% of mixed binder [P(VdF-co-HFP) : PVP =7 : 3] The self-discharge of unit cell showed that diffusion process was controlled by the ion concentration difference of initial electrolyte due to the characteristics of Electric Double Layer Capacitor (EDLC) charged by ion adsorption in the beginning, but this by current leakage through the double-layer at the electrode/electrolyte interface had a minor effect and voltages of curves were remained constant regardless of electrode material. The electrochemical characteristics of 2.3 V/3,000 F grade EDLC were as follows: 0.35 m of DC-ESR (100 A discharge), 0.14 mof AC-ESR (AC amplitude 100 mV), 2.80 Wh/kg (3.73 Wh/L) of energy density and 4.64 kW /kg (6.19 kW/L) of power density. Power output was compatible with electric vehicle applications, uninterrupted power supply and engine starter, in due consideration of Ragone relations.