• Journal of Power Electronics
• /
• 제9권6호
• /
• pp.854-865
• /
• 2009

Super-lift dc-dc converters are a series of advanced step-up dc-dc topologies that provide high voltage transfer gains by super-lift techniques. This paper presents a developed graphical modelling method for super-lift converters and gives a thorough analysis with a consideration of the effects caused by parasitic parameters and diodes' forward voltage drop. The general guidelines for constructing and deriving graphical models are provided for system analysis. By applying it to examples, the proposed method shows the advantages of high convenience and feasibility. Both the circuit simulation and experimental results are given to support the theoretical analysis.

• 전기전자학회논문지
• /
• 제23권3호
• /
• pp.1054-1060
• /
• 2019

A extension of the high boost voltage-lift DC-DC converter with large conversion ratio has been proposed in this paper. The proposed extension is combined the switched-inductor cell (SL-cell) and modular voltage cell (MV-cell). The proposed structure can achieve the large voltage conversion without high duty-cycle and the low voltage of the components. Moreover, the PID controller for novel SL-MV voltage-lift DC-DC converter also introduces. This technique a good-performance output voltage can kept constant with an good transient performance when the output load is suddenly changed. In order to prove the theoretical analysis, the experimental setup has been built for the DC load of $150[{\Omega}]$ and $300[{\Omega}]$. In addition, the transient of output voltage has been tested to determine the controller. Experimental results validate the effectiveness of the theoretical analysis proving the satisfactory converter performance.

• 조명전기설비학회논문지
• /
• 제13권4호
• /
• pp.152-159
• /
• 1999

본 논문에서는 교류전압 인가시 모의 GIS내에 존재하는 금속이물의 거동현상에 대해 연구하였다. 평행평판 전극을 내장한 가스챔버를 설계·제작하고, 전국내 선형 및 구형의 금속이물에 대해 부상전압을 계산 및 측정하였다. 또한 각각의 금속이물에 대전되는 전하량을 계산하였다. 고속카메라를 이용하여 금속이물의 종류 및 인가전압에 따른 거동양상과 부상시간, 부상높이 등의 거동특성을 분석하였다. 전계인가시 금속이물의 대전 전하량은 금속이물의 크기에 따라 증가하며, 부상전압은 서형 및 구형 금속이물의 직경에 큰 양형을 받는 것으로 나타났다. 금속이물의 부상이후 부상전압 부근의 전압에서의 선형 금속이물은 후 전극과 거의 수직인 상태로 상하 왕복운동을 하며, 거의 수직상태로 움직이는 거동 형태를 나타내었다. 절연파괴전압에 가까운 전압에서는 금속이물은 부상 중에 수회 수직회전을 반복하며, 장시간 부유하였다.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2001년도 춘계학술대회논문집A
• /
• pp.529-533
• /
• 2001

NDI technique system using AC current is newly developed for inspection of defects. This technique is non-contact measurement system and can be applied for locating and sizing of surface defects in components. In this paper, the technique was applied for evaluating the location and size for 2-dimensional surface cracks and we had investigated the influence of frequency and lift-off. The results show that defects are able to detect with the variety of voltage, and the measuring voltage for the depth of defects are under the influence of the measuring frequency and the lift-off.

• Journal of Power Electronics
• /
• 제19권3호
• /
• pp.645-654
• /
• 2019

In this paper, a new high step up DC/DC converter with a modified super-lift technique is presented. The coupled inductor technique is combined with the super-lift technique to provide a tenfold or more voltage gain with a proper duty cycle and a low turn ratio. Due to a high conversion ratio, the voltage stress on the semiconductor devices is reduced. As a result, low voltage ultra-fast recovery diodes and low on resistance MOSFET can be used, which improves the reverse recovery problems and conduction losses. This converter employs a passive clamp circuit to recycle the energy stored in the leakage inductance. The proposed convertor features a high conversion ratio with a low turn ratio, low voltage stress, low reverse recovery losses, omission of the inrush currents of the switch capacitor loops, high efficiency, small volume and reduced cost. This converter is suitable for renewable energy applications. The operational principle and a steady-state analysis of the proposed converter are presented in details. A 200W, 30V input, 380V output laboratory prototype circuit is implemented to confirm the theoretical analysis.

• 한국산업융합학회 논문집
• /
• 제22권3호
• /
• pp.251-257
• /
• 2019

This paper proposes a new measurement method using virtual power concept to measure the effective value of 3-phase voltage with variable frequency. The conventional effective value measurement method uses a method of integrating data sampled during one or half cycle of the power voltage and averaging it. In this method, since the effective voltage is calculated every cycle, a time delay occurs in the measured effective voltage and it is s a problem to measure the effective value of a device whose frequency varies from time to time, such as a generator. The proposed 3-phase voltage rms measurement method has an advantage that it can measure accurate voltage RMS value regardless of measurement frequency variation. In particular, there is an advantage in that it is possible to measure a 3-phase effective voltage rather than an average value of the effective voltage of each phase in a 3-phase unbalance voltage. In addition, the validity of the proposed method is verified by using the Psim simulation tool and the experimental results are analyzed by applying the proposed measurement algorithm to the actual three phase synchronous generator voltage measurement experiment.

• 한국산업융합학회 논문집
• /
• 제24권4_1호
• /
• pp.387-395
• /
• 2021

Distributed resources such as renewable energy sources and ESS are connected to the low voltage direct current(LVDC) distribution network through the power conversion system(PCS). Control power is required for the operation of the PCS. In general, controller power is supplied from AC power or DC power through switch mode power supply(SMPS). However, the conventional SMPS has a low input voltage, so development and research on high input voltage self-power suitable for LVDC is insufficient. In this paper, to develop Self-Power that can be used for LVDC, the characteristics of the conventional topology are analyzed, and a series-input single-output flyback converter using a flux-sharing transformer for high voltage is designed. The high input voltage Self-Power was designed in the DCM(discontinuous current mode) to reduce the switching loss and solve the problem of current dissipation. In addition, since it operates even at low input voltage, it can be applied to many applications as well as LVDC. The validity of the proposed high input voltage self-power is verified through experiments.

• Journal of Electrical Engineering and Technology
• /
• 제12권3호
• /
• pp.1082-1089
• /
• 2017

Negative output elementary super lift Luo converter (NOESLLC), which has the significant advantages including high-voltage transfer gain, high efficiency, high power density, and reduced output voltage/inductor current ripples when compared to the traditional DC-DC converters, is an attractive DC-DC converter for the field of negative DC voltage applications. In this study, in consideration of the voltage across the energy transferring capacitor changing abruptly at the beginning of each switching cycle, the improved averaged model of the NOESLLC operating in continuous conduction mode (CCM) is established. The improved DC model and transfer functions of the system are derived and analyzed. The current mode control is applied for this NOESLLC. The results from the theoretical calculations, the PSIM simulations and the circuit experiments show that the improved DC model and transfer functions here are more effective than the existed ones of the NOESLLC to describe its real dynamical behaviors.

• 비파괴검사학회지
• /
• 제22권1호
• /
• pp.53-58
• /
• 2002

계자코일에 흐르는 교류전류로 전자기장을 유도하고, 결함에 의하여 누설되는 자속을 간극을 갖는 헤드로 측정하여 결함을 검출하는 새로운 비파괴탐상장치를 구성하였다. 이 탑상장치는 비접촉으로 강자성체의 구조물 요소에 존재하는 표면결항을 검출하고, 그 크기를 평가하는데 적용할 수 있다. 본 논문은 강자성체에 도입한 2차원 표면결함에 적용하여 결함의 평가를 실시하였다. 또한 측정주파수와 lift-off가 이들 평가에 미치는 영향을 검토하였다. 결함은 전압 분포에서 최대치로 검출할 수 있고, 이 최대전압의 변화는 결함의 깊이가 증가함에 따라 증가한다. 결함의 최대전압은 주파수와 lift-off 의 영향을 받지만, 작은 깊이의 결함은 깊이와 전압이$(V_0/V_{ave})$의 관계로부터 선형적으로 예측할 수 있다.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1996년도 하계학술대회 논문집 C
• /
• pp.1925-1928
• /
• 1996

In this work, the behavior of conducting wire type particles existing inside the cylinder type coaxial electrode has been systematically investigated by charge simulation method and electrostatic force analysis from the view point of the acquired charging before being lifted off into the gap under the high ac voltage. Spheroidal charge are adopted as a image charge for the CSM analysis in order to calculate the acquired charges of the particles which are erected on the surface of the outer electrode. For this purpose, different material of the particle and their lengths and diameters have been considered in view to calculate their lift-off field, acquired charge and to understand their effect on the lift-off voltage. The results imply that the particle lengths and diameter have an different influence on the particle behavior in GIS system.