• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.10 no.7
• /
• pp.1266-1274
• /
• 2006

A non-overlap boosted-clock charge pump(NBCCP) with internal pumping capacitor, an advantageous circuit from a minimizing point of TFT-LCD driver IC module, is proposed in this paper. By using the non-overlap boosted-clock swinging in 2VDC voltage, the number of pumping stages is reduced to half and a back current of pumping charge from charge pumping node to input stage is also prevented compared with conventional cross-coupled charge pump with internal pumping capacitor. As a result, pumping current of the proposed NBCCP circuit is increased more than conventional cross-coupled charge pump, and a layout area is decreased. A proposed DC-DC converter for TFT-LCD driver IC is designed with $0.18{\mu}m$ triple-well CMOS process and a test chip is in the marking.

• Journal of the Microelectronics and Packaging Society
• /
• v.11 no.2 s.31
• /
• pp.1-9
• /
• 2004

We investigated the effect of $BaTiO_3$ powder content on the dielectric constant of epoxy/$BaTiO_3$ composite embedded capacitor films (ECFs). Variations of the dielectric constant of epoxy/$BaTiO_3$ composite ECFs with unimodal $BaTiO_3$ powder content were measured. To explain this result, density of the ECFs was measured, and surface and cross section images of the ECFs were observed. In addition, variations of the dielectric constant of epoxy/$BaTiO_3$ composite ECFs with various bimodal combinations were measured. In the case of unimodal powder, the maximum dielectric constant was about 60 at $60\;vol\%$ S4 powder. And more powder addition lowered the dielectric constant of the ECFs, which was due to voids or pores formation by excess $BaTiO_3$ powder. In the case of bimodal combination, $75vol\%\;BaTiO_3$ powder loading and the dielectric constant of 90 were achieved using $S_5+C_1$ combination, biggest and smallest powder combination.

• Proceedings of the Materials Research Society of Korea Conference
• /
• 2007.11a
• /
• pp.23.2-23.2
• /
• 2007

• Electrical & Electronic Materials
• /
• v.26 no.2
• /
• pp.7-13
• /
• 2013

• Journal of the Microelectronics and Packaging Society
• /
• v.11 no.1
• /
• pp.87-96
• /
• 2004

Polymer/ceramic composites are the most promising embedded capacitor material for organic substrates application. Predicting the effective dielectric constant of polymer/ceramic composites is very important for design of composite materials. In this paper, we measured the dielectric constant of epoxy/$BaTiO_3$ composite embedded capacitor films with various $BaTiO_3$ particles loading for 5 different sizes $BaTiO_3$ powders. Experimental data were fitted to several theoretical equations to find the equation useful for the prediction of the effective dielectric constant of polymer/ceramic composites and also to estimate the dielectric constant of $BaTiO_3$ powders. The Lichtenecker equation and the Jayasundere-Smith equation were useful for the prediction of the effective dielectric constant of epoxy/$BaTiO_3$ composites. And calculated dielectric constants of the $BaTiO_3$ powders were in the range of 100 to 600, which were lower than those of $BaTiO_3$ bulk ceramics.

• Proceedings of the KIPE Conference
• /
• 2015.07a
• /
• pp.305-306
• /
• 2015

기존 소용량 전원 장치의 경우, Primary 측에 단상 AC 전압 평활을 위한 고압 전해 커패시터가 사용되는 것이 일반적이다. 이러한 전해 커패시터는 회로의 전체적인 부피를 키우고 제작 단가를 증가시킨다. 뿐만 아니라, 전원 열악 지역(인도향 제품 등)과 같이 300Vac 이상의 전압 한계치를 갖는 경우에는 전해 커패시터 파열에 의한 회로의 손상을 야기할 수 있다. 본 논문에서는 고압 DC 평활 커패시터를 삭제한 소용량 전원 장치 구현 방안을 제안한다. 제안 방식은 고전압 전해 커패시터의 삭제와 스위치 내장형 IC를 채용함으로써 소형화 및 원가 저감이 가능하며, 동시에 불안정한 입력 전원에도 전해 커패시터 파열에 의한 회로 손상을 막을 수 있다. 본 논문에서는 절연형 Flyback 컨버터를 이용하여, 이론적 특성 분석과 5W급 시작품을 통한 실험적 분석을 통해 그 타당성을 검증한다.

• Information and Communications Magazine
• /
• v.28 no.11
• /
• pp.24-30
• /
• 2011

본고에서는 소형 고집적 이동단말기용 패키지를 위해 구현 되고 있는 능/수동소자 내장형 패키지 기술에 대해 알아보고자 한다. 능/수동소자내장형 패키지 기술은 IC 칩과 같은 능동 소자와 저항, 커패시터, 인덕터와 같은 수동소자 부품들을 패키지 기판 내부에 내장시켜 소형화를 추구함과 더불어 칩과 수동소자간의 접속 길이를 짧게 해서 전기적 성능을 향상시키실 수 있는 패키징 기술이다. 본 원고에서는 PCB기술에 기반을 둔 embedded active device 기술과 웨이퍼 레벨 패키징 기술에 기반을 둔 fan-out embedded wafer level package 기술 동향에 대해 서술하고 그 특정들을 비교 분석하였으며 이 기술들에 대환 동향을 살펴보고자 한다.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.11 no.10
• /
• pp.1899-1909
• /
• 2007

A cross-coupled charge pump with internal pumping capacitor, witch is advantages from a point of minimizing TFT-LCD driver IC module, is newly proposed in this paper. By using a NMOS and a PMOS diode connected to boosting node from VIN node, the pumping node is precharged to the same value each pumping node at start pumping operation. Since the lust-stage charge pump is designed differently from the other stage pumps, a back current of pumped charge from charge pumping node to input stage is prevented. As a pumping clock driver is located the font side of pumping capacitor, the driving capacity is improved by reducing a voltage drop of the pumping clock line from parasitic resistor. Finally, a layout area is decreased more compared with conventional cross-coupled charge pump by using a stack-MIM capacitors. A proposed charge pump for TFT-LCD driver IC is designed with $0.13{\mu}m$ triple-well DDI process, fabricated, and tested.

• Journal of the Korea Society of Computer and Information
• /
• v.26 no.11
• /
• pp.11-19
• /
• 2021

In this paper, we propose a prototype platform combined with the power management system using, as an auxiliary power storage device, a supercapacitor that can be fast charged and discharged with high power efficiency as well as semi-permanent charge and discharge cycle life. For the proposed platform, we designed a technique which is capable of detecting the state of power cutoff or resumption of power supplied from the solar panel in accordance with physical environment changes through an interrupt attached to the micro-controller was developed. To prevent data loss in a computing environment in which continuous power supply is not guaranteed, we implemented a low-level system software in the micro-controller to transfer program context and data in volatile memory to nonvolatile memory when power supply is cut off. Experimental results shows that supercapacitors effectively supply temporary power as auxiliary power storage devices. Various benchmarks also confirm that power state detection and transfer of program context and data from volatile memory to nonvolatile memory have low overhead.

• Proceedings of the KIPE Conference
• /
• 2014.07a
• /
• pp.116-117
• /
• 2014

본 논문에서는 3상 IPM을 사용하여 2상 유도전동기를 위한 2레그형 인버터를 설계하였다. 3상 IPM은 6개의 스위칭 소자를 내장하고 있어서 이중 4개는 2레그형 인버터로 사용하고, 나머지 2개는 역률제어 회로에 이용할 수 있다. 이렇게 하면 하드웨어의 추가를 최소화하면서 역률제어 기능을 갖는 2레그형 인버터를 구현할 수 있다. 2레그형 인버터에서는 반드시 직류링크에 2개의 커패시터를 직렬로 연결하는데, 입력 전원의 반주기 마다 각각의 커패시터에 충방전 동작이 수행된다. 이러한 동작으로 인해 2개의 커패시터에 전압 불균형이 발생할 수 있고 커패시터 용량이 서로 다를 경우에는 이 전압 리플이 더욱 커지게 되며, 이것은 전동기에 불평형 전류를 공급하게 되어 전동기의 토크리플을 발생시킨다. 본 논문에서는 직류링크의 전압 불균형 문제가 전동기에 미치는 영향을 분석하고, 이러한 전압 불균형을 보상하여 전동기의 토크리플을 제거하고 동작특성을 개선하는 방법을 제안하며, 컴퓨터 시뮬레이션을 통하여 이를 검증한다.