• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.193-196
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• 2003

This paper describes a micro DC-DC converter using LTCC(Low Temperature Cofired Ceramics) technology. We have designed a inductor, an embedded structure to maximize the effect of miniaturizing, and applied the Neumann's formula to calculate inductance. Also, we have implemented a micro DC-DC conveter of which whole volume is $13{\times}18{\times}0.13[mm^3]$ by embeding other passive components such as resistors and capacitors.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2001년도 ICCAS
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• pp.128.2-128
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• 2001

Since pulse energization can improve the performance of Electrostatic Precipitator(ESP) for high resistivity dusts, high voltage micro-pulse generators, 70kV 140usec duration pulses for instance, are commonly developed by LC resonance for most pulse powered ESPs. Consisting of discharge electrodes and collecting electrodes, ESP has its own capacitance like a capacitor. ESP's capacitance affects the LC resonance phenomenon with resonance inductor and capacitor of micro-pulse power supply, engineers should acquire the value of their ESP to design for proper power supply design. In this study, we describe the ESP's capacitance measuring device which has the same topology with our new developed micro-pulse power supply. In this microcontroller based capacitance measuring equipment, ESP's capacitance can be calculated easily through ...

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 C
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• pp.2254-2256
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• 2000

This paper presents an implantable telemetry LC resonance-type pressure sensor for the measurement of the ventricle pressure. This sensor consists of a capacitor and an inductor. This resonant circuit is magnetically coupled with an external antenna coil. The resonance frequency of the circuit decreases as the sensor capacitance is increased by the applied pressure. The inductance and the capacitance are 428nH and 0.98${\mu}F$, respectively. The resonance frequency is 245.7MHz when the differential pressure is zero. The sensitivity of the sensor is 9.477kHz/Pa.

• Journal of Power Electronics
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• 제5권4호
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• pp.247-256
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• 2005

In order to harvest power in an efficient manner from a micro piezoelectric (PZT) device for charging the battery of a remote system, a new AC/DC resonant pulse power converter is proposed. The proposed power converter has two stages in the power conversion process. The first stage includes N-type MOSFET full bridge rectifier. The second stage includes a boost converter having an N-type MOSFET and a P-type MOSFET. MOSFETs work in the $1^{st}$ or $3^{rd}$ quadrant region. A small inductor for the boost converter is assigned in order to make the size of the power converter as small as possible, which makes the on-interval of the MOSFET switch of the boost converter ultimately short. Due to this short on-interval, the parasitic junction capacitances of MOSFETs affect the performance of the power converter system. In this paper, the performance of the new converter is analytically and experimentally evaluated with consideration of the parasitic capacitance of switching devices.

• 한국자기학회지
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• 제17권3호
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• pp.141-146
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• 2007

MEMS 공정기법을 적용하여 새로운 형태의 LC 공진기형 자기센서를 제작하였다. 이 마이크로 LC 공진기는 솔레노이드형 마이크로인덕터에 연자성 마이크로와이어를 코어로 삽입하고 여기에 콘덴서를 병렬로 연결하여 구성하였다. 코어 자성 물질은 melt spinning 법으로 제조한 유리가 코팅된 $Co_{83.2}B_{3.3}Si_{5.9}Mn_{7.6}$ 마이크로와이어이다. 코어물질의 연자성을 개선하기 위하여 $150^{\circ}C$, $200^{\circ}C,\;250^{\circ}C,\;300^{\circ}C$ 등 여러 온도에서 1시간씩 진공 열처리하였다. MEMS 공정으로 제작된 솔레노이형 마이크로인덕터는 길이가 $500{\sim}1,000{\mu}m$ 이며 감은수는 $10{\sim}20$회이다. 외부자기장에 따른 본 마이크로인덕터의 최대 인덕턴스 변화율은 370%이었다. 초연자성 마이크로와이어의 투자율이 외부자기장에 따라 급격히 변하기 때문에 인덕턴스변화율이나 LC 공진기의 자기임피던스 변화율(MIR)이 급속하게 변한다. 최대감도를 얻기 위해서 MIR 곡선은 정교하게 조절할 수 있다. 마이크로인덕터와 멀티바이브 레어터 회로로 구성된 원형 자기센서소자를 제작하여 시험동작을 하는데 성공하였다.

• 한국전자파학회지:전자파기술
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• 제12권3호
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• pp.60-68
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• 2001

본 논문에서는 최근 초소형 기술로 각광받고 있는 MEMS(MicroElectroMechanical System) 기술을 이용한 무선통신 분야의 응용을 제고한다. RF ME- MS 기술은 기존의 기술들에 비해 크기나 전력소모, 삽입손실 등에서 우수한 고주파 특성을 갖는 소자 나 부품을 만들 수 있으며 특히 휴대용 단말기에 적 용 가능한 RE 부품들 즉 저손실 전송선로, 스위치, High Q inductor, 안테나 등의 주요 부품에 대한 연 구가 많이 이루어지고 있다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 C
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• pp.1301-1302
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• 2006

In this paper, embedded spiral inductors are investigated into the PCB substrate for low cost RF SOP applications. The spiral inductors designed with geometrical variations were simulated, fabricated, measured, and characterized by using 3D EM simulator, 8 layered PCB standard process and HP 8510B network analyzer (or verifying their applicability. The fabricated embedded spiral inductor has inductance of 9.4 nH at 800MHz, maximum quality factor of 64.8 at 1.09GHz and self resonant frequency of 3.93GHz, respectively. As the measured inductances and quality factors are well matched with simulated ones. PCB embedded spiral inductors are promising for advanced electronic systems with various functionality, low cost, small size and volume.

• Journal of Power Electronics
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• 제13권6호
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• pp.919-927
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• 2013

This paper proposes a Boundary Current Mode (BCM) control scheme to realize soft switching on a conventional single phase full bridge DC/AC inverter. This technique with the advantages of no auxiliary components, low cost, high efficiency, and simple in control, is attractive for micro-inverter applications. The operation principle and characteristic waveforms of the proposed soft switching technique are analyzed in theory. A digital controller is provided based on that theory. To balance the requirements of efficiency, switching frequency, and inductor size, the design considerations are discussed in detail to guide in BCM inverter construction. A 150W prototype is built under these guidelines to implement the BCM control scheme. Simulation and experiment results demonstrate the feasibilities of the proposed soft switching technique.

• 마이크로전자및패키징학회지
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• 제15권1호
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• pp.39-44
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• 2008

In this paper, fully embedded 2.4GHz WLAN band pass filter (BPF) was investigated into a multi-layered organic packaging substrate using high Q spiral stacked inductors and high Dk MIM capacitors for low cost RF System on Package (SOP) applications. The proposed 2.4GHz WLAN BPF was designed by modifying chebyshev second order filter circuit topology. It was comprised of two parallel LC resonators for obtaining two transmission zeros. It was designed by using 2D circuit and 3D EM simulators for finding out optimal geometries and verifying their applicability. It exhibited an insertion loss of max -1.7dB and return loss of min -l7dB. The two transmission zeros were observed at 1.85 and 6.7GHz, respectively. In the low frequency band of $1.8GHz{\sim}1.9GHz$, the stop band suppression of min -23dB was achieved. In the high frequency band of $4.1GHz{\sim}5.4GHz$, the stop band suppression of min -l8dB was obtained. It was the first embedded and the smallest one of the filters formed into the organic packaging substrate. It has a size of $2.2{\times}1.8{\times}0.77mm^3$.

• Design & Manufacturing
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• 제2권6호
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• pp.11-16
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• 2008

In order to satisfy the customer's variant needs for a product quality in recent years, a demand for developing higher precision machining technologies in a lot of application areas such as automobile, cellular phone and semiconductor has been increased more and more. Micro-magnetic induced polishing(${\mu}-MIP$) process is one of these precision technologies. In this study, to verify the parameters' effect of the ${\mu}-MIP$ process on the surface roughness improvement of the inclined workpiece, well planned experiment which was called the design of experiments was carried out. Considered parameters were spindle speed, inductor current, abrasive configuration and working gap between the workpiece and the solid tool. As a result, it was seen that the inductor current and the working gap greatly affected the surface roughness improvement. And to predict the surface roughness of the inclined workpiece, S/N ratio and first-order response surface model was developed.