• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1999년도 춘계학술대회 논문집
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• pp.80-83
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• 1999

We have studied properties(crystal structure, density, absorption, contraction, initial permeability, and permeability) of Ni$_{0.175-x}$Cu$_{x}$Zn$_{0.33}$Fe$_{0.495}$ (x=0~0.175) ferrites with various NiO and CuO, because of development of materials for high frequency inductor. The XRD peaks of all of samples were observed only spine이 phase. As a results of the density, absorption rate, and shrinkage rate, the grain growth progressed rapidly in x=0.1 at 95$0^{\circ}C$, x=0.075 at 105$0^{\circ}C$, and x=0.025 at 115$0^{\circ}C$ for 3 hours. Initial permeability increased with increasing CuO concentration until x=0.1, and then decreased. The complex permeability as a function frequency were high values at sintered 105$0^{\circ}C$ fotr3 hours in x=0.075, 0.1., 0.1.1.

• 한국전자파학회논문지
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• 제11권3호
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• pp.445-453
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• 2000

본 논문에서는 MMlC 설계에서 필요한 능동 인덕터의 설계 방법을 제시하였다. 제안된 가변 능동 인덕터는 궤환 커패시터와 궤환 저항을 가진 종속접속된 2개의 FET로 구성을 하였다. 제안된 가변 능동 인덕터는 낮은 직렬 저항을 가져서 상대적으로 높은 Q 값을 얻을 수 있고 높은 주파수대에서 사용이 가능한 우수한 동작 특성 을 가진다. 인덕턴스 값은 궤환 커패시터와 궤환 저항 및 바이어스 전압에 의하여 변화되어지며 궤환 저항과 회 로내 병렬 저항을 가변하였을 때 1 GHz에서 15 GHz까지 범위에서 인덕턴스 값이 0.2nH에서 L7nH까지 변화하 였다. 또한 제안된 능동 인덕터를 사용하여 대역통과 필터를 설계하였을 때 삽입손실은 약 0.4 dB이고 반사 손실은 20dB 이상의 우수한 결과를 얻을 수 있었다

• 한국인터넷방송통신학회논문지
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• 제16권6호
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• pp.231-237
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• 2016

본 논문에서는 스위치드 본드와이어 인덕터 뱅크를 사용하여, 넓은 주파수 튜닝범위를 갖는 다중대역 저잡음 CMOS 전압제어발진기가 제안되었다. 본드와이어 인덕터와 CMOS 스위치의 결합으로 주파수 튜닝범위는 증가하고, 위상잡음은 개선되었다. 제안된 다중대역 CMOS 전압제어발진기는 2.3GHz부터 6.3GHz까지의 주파수에 대해 동작하며, 위상잡음은 1MHz 오프셋 주파수에 대해, 각각 -136dBc/Hz와 -122dBc/Hz를 나타내었다. 스위치드 본드와이어 인덕터 뱅크는 각 주파수 대역에서 높은 Quality factor(Q)를 나타내어, 위상잡음과 전력소모량 사이의 trade-off를 더욱 원활하게 해 준다. 제안된 전압제어발진기는 TSMC 0.18um CMOS공정을 사용하여 설계되었고, 7.2mW의 전력을 사용하며, 6GHz 발진주파수에 대해 1MHz 오프셋 주파수에서 -189.3dBC/Hz의 성능지수(FOM)를 나타내었다.

• 한국세라믹학회지
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• 제40권4호
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• pp.375-379
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• 2003

In this paper, a novel design of multilayer ceramic-based Transmit/Receive (T/R) switch using Low Temperature Co-fired Ceramic (LTCC) technology have been presented. Compact T/R switch has been designed by transforming quarter-wave transmission line to its lumped equivalent circuit. Especially, high-Q three dimensional inductors with double strip have been proposed and incorporated. The proposed inductor has been modeled by multi-conductor coupled lines. A measured inductor quality factor (Q) of 80 and a Self-Resonance Frequency (SRF) of 6.6 GHz have been demonstrated. The inductor library has been incorporated into the design of WCDMA T/R switch.

• 반도체디스플레이기술학회지
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• 제2권1호
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• pp.11-14
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• 2003

The high Q(quality factor) suspended spiral inductors were fabricated on the silicon substrate by 3D surface micromachined process. The integration of 2.4GHz VCO has been performed by fabricating suspended spiral inductor of the top of CMOS VCO circuit. The phase noise of VCO integrated MEMS inductor is 93.5 dBc/Hz at 100kHz of offset frequency.

• 마이크로전자및패키징학회지
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• 제16권4호
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• pp.5-8
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• 2009

In this paper, a high-quality low-temperature co-fired ceramic (LTCC) solenoid inductor using a solder ball and an air cavity on a silicon wafer for three-dimensional (3-D) system-in-package (SiP) is proposed. The LTCC multi-layer solenoid inductor is attached using Ag paste and solder ball on a silicon wafer with the air cavity structure. The air cavity is formed on a silicon wafer through an anisotropic wet-etching technology and is able to isolate the LTCC dielectric loss which is equivalent to a low k material effect. The electrical coupling between the metal layer and the LTCC dielectric layer is decreased by adopting the air cavity. The LTCC solenoid inductor using the solder ball and the air cavity on silicon wafer has an improved Q factor and self-resonant frequency (SRF) by reducing the LTCC dielectric resistance and parasitic capacitance. Also, 3-D device stacking technologies provide an effective path to the miniaturization of electronic systems.

• Journal of Power Electronics
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• 제16권2호
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• pp.436-446
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• 2016

A novel step-up DC-DC converter with a switched-coupled-inductor-capacitor (SCIC) which successfully integrates three-winding coupled inductors and switched-capacitor techniques is proposed in this paper. The primary side of the coupled inductors for the SCIC is charged by the input source, and the capacitors are charged in parallel and discharged in series by the secondary windings of the coupled inductor to achieve a high step-up voltage gain with an appropriate duty ratio. In addition, the passive lossless clamped circuits recycle the leakage energy and reduce the voltage stress on the main switch effectively, and the reverse-recovery problem of the diodes is alleviated by the leakage inductor. Thus, the efficiency can be improved. The operating principle and steady-state analyses of the converter are discussed in detail. Finally, a prototype circuit at a 50 kHz switching frequency with a 20-V input voltage, a 200-V output voltage, and a 200-W output power is built in the laboratory to verify the performance of the proposed converter.

• Journal of Power Electronics
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• 제5권2호
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• pp.99-103
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• 2005

In this paper, a novel circuit topology of a three-winding coupling inductor-assisting a high-frequency PWM boost chopper type DC-DC power converter with a high boost voltage conversion ratio and low switch voltage stress is proposed for the new energy interfaced DC power conditioner in solar photovoltaic and fuel cell generation systems. The operating principle in a steady state is described by using its equivalent circuits under the practical condition of energy processing of a lossless capacitive snubber. The newly-proposed power MOSFET boost chopper type DC-DC power converter with the three-winding coupled inductor type transformer and a single lossless capacitor snubber is built and tested for an output power of 500W. Utilizing the lower voltage and internal resistance power MOSFET switch in the proposed PWM boost chopper type DC-DC power converter can reduce the conduction losses of the active power switch compared to the conventional model. Therefore, the total actual power conversion efficiency under a condition of the nominal rated output power is estimated to be 81.1 ％, which is 3.7％ higher than the conventional PWM boost chopper DC power conversion circuit topology.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2003년도 춘계전력전자학술대회 논문집(1)
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• pp.231-234
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• 2003

This paper presents a novel high frequency transformer linked full-bridge type soft-switching phase-shift PWM control scheme DC-DC power converter, which can be used as power conditioner fur small-scale fuel cell power generation system. Using full-bridge soft-switching DC-DC converter topology makes possible to use low voltage high performance MOSFETs to achieve high efficiency of the power conditioner. A tapped inductor filter is implemented in the proposed soft-switching converter topology to achieve soft-switching PWM constant high frequency operation for a wide load variation range. to minimize circulating and idling currents without using additional resonant circuit and auxiliary power switching devices. The practical effectiveness of the proposed soft-switching DC-DC converter is verified in laboratory level experiment with 1 kW 100kHz breadboard setup using power MOSFETs. Actual efficiency of 94-96$\%$ is obtained for the wide load range

• 전력전자학회논문지
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• 제26권1호
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• pp.53-58
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• 2021

Operation of the interleaved Boost PFC converter in Critical Conduction Mode (CrM) shows the advantages of high efficiency and good EMI characteristics owing to the valley switching of FET. However, when it is designed for a highly pulsating load, operation at a relatively high frequency is inevitable at non-pulsating typical load condition, resulting in efficiency degradation. Moreover, the physical size of the inductor becomes problematic because of the nature of the CrM operation, where the inductor peak current is about two times the inductor average current, thereby requiring high DC-bias characteristics, which is worse when the output power is high. In this study, a new parallel driving method of two sets of interleaved boost PFC converters for highly pulsating high-power application is proposed. The proposed method does not require any additional load-sharing controller, resulting in high efficiency and smaller inductor size.