• Title, Summary, Keyword: on-chip power module

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An embedded vision system based on an analog VLSI Optical Flow vision sensor

  • Becanovic, Vlatako;Matsuo, Takayuki;Stocker, Alan A.
    • Proceedings of the Korea Society of Information Technology Applications Conference
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    • pp.285-288
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    • 2005
  • We propose a novel programmable miniature vision module based on a custom designed analog VLSI (aVLSI) chip. The vision module consists of the optical flow vision sensor embedded with commercial off-the-shelves digital hardware; in our case is the Intel XScale PXA270 processor enforced with a programmable gate array device. The aVLSI sensor provides gray-scale imager data as well as smooth optical flow estimates, thus each pixel gives a triplet of information that can be continuously read out as three independent images. The particular computational architecture of the custom designed sensor, which is fully parallel and also analog, allows for efficient real-time estimations of the smooth optical flow. The Intel XScale PXA270 controls the sensor read-out and furthermore allows, together with the programmable gate array, for additional higher level processing of the intensity image and optical flow data. It also provides the necessary standard interface such that the module can be easily programmed and integrated into different vision systems, or even form a complete stand-alone vision system itself. The low power consumption, small size and flexible interface of the proposed vision module suggests that it could be particularly well suited as a vision system in an autonomous robotics platform and especially well suited for educational projects in the robotic sciences.

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Low Power 260k Color TFT LCD Driver IC

  • Kim, Bo-Sung;Ko, Jae-Su;Lee, Won-Hyo;Park, Kyoung-Won;Hong, Soon-Yang
    • ETRI Journal
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    • v.25 no.5
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    • pp.288-296
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    • 2003
  • In this study, we present a 260k color TFT LCD driver chip set that consumes only 5 mW in the module, which has exceptionally low power consumption. To reduce power consumption, we used many power-lowering schemes in the logic and analog design. A driver IC for LCDs has a built-in graphic SRAM. Besides write and read operations, the graphic SRAM has a scan operation that is similar to the read operation of one row-line, which is displayed on one line in an LCD panel. Currently, the embedded graphic memory is implemented by an 8-transistor leaf cell and a 6-transistor leaf cell. We propose an efficient scan method for a 6-transistor embedded graphic memory that is greatly improved over previous methods. The proposed method is implemented in a 0.22 ${\mu}m$ process. We demonstrate the efficacy of the proposed method by measuring and comparing the current consumption of chips with and without our proposed scheme.

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IO BOARD DESIGN OF NEXT GENERATION SATELLITE USING THE SPACE WIRE INTERFACE

  • Kwon Ki-Ho;Kim Day-Young;Choi Seung-Woon;Lee Jong-In
    • Bulletin of the Korean Space Science Society
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    • pp.223-226
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    • 2004
  • This paper presents a feasibility study of an advanced IO board design for the next generation of low-earth orbit satellites. Advanced IO board design includes sensor interface, NO, D/A, Digital Module, Serial Module etc, and allows to process increasing data rates between IO board and CPU board. The higher data rate involved in modem IO board additionally introduce issues such as noise, fault tolerance, command and data handling, limited pin count and power consumption problems. The experience in KOMPSAT-l and 2 program with this kind of problems resulted in using SMCS chip set, a high speed serial link technology based on IEEE-1355 (Space Wire Protocol) (ESA-ESTEC 2003, Parkes 1999), as a standard for next generation of satellite IO board design.

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A Study on Thermoelectric Converter Using DMFC (Direct Methanol Fuel Cell) System (DMFC 시스템에 사용한 열전 변환기에 관한 연구)

  • Zhang, Jing-Liang;Moon, Chae-Joo;Chang, Young-Hak;Cheang, Eui-Heang;Kim, Tae-Gon
    • Proceedings of the KIEE Conference
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    • pp.92-94
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    • 2007
  • This article describes a thermoelectric converter, which is powered by thermoelectric (TE) power modules. This system uses TE devices that directly convert heat energy to electricity to power a converter using direct methanol fuel ceil (DMFC) system. The characteristics of the TE module were tested at different temperatures. A boost BC-DC converter was designed and controlled by a power-supply controller chip. Efficiency of about 80% can be achieved and because the thermoelectric converter system has not moving parts and has a small volume, the system can be carried about easily and conveniently to supply portable electric equipment and this is very important for some mobile equipment.

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An investigation Study of Electromagnetic Compatibility for Power Module (전원모듈의 전자파 적합성(EMC) 특성 분석)

  • Chae, Gyoo-Soo
    • Journal of the Korea Convergence Society
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    • v.7 no.6
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    • pp.23-28
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    • 2016
  • In this study, an investigation study on EMC(Electromagnetic Compatibility) is presented for power converter circuit. A DC-DC power converter circuit using LT3652 chip is designed and fabricated. The simulation results using ANSYS SIwave for far field radiation and unwanted emissions are presented. To minimize the unwanted emissions, we design a optimized circuit by using capacitors and ground posts. The conducted and radiation emissions are measured in the EMC test chamber based on standardized testing procedures of CISPR 22. The measured EMI emission values for a power converter circuit are presented and compared with the original circuit. The results show that the unwanted emissions from the circuit are tremendously diminished due to the applied EMI reduction techniques. The results proposed here can be usefully applied on designing power converter modules.

Design of a High-Precision Constant Current AC-DC Converter with Inductance Compensation

  • Chang, Changyuan;Xu, Yang;Bian, Bin;Chen, Yao;Hu, Junjie
    • Journal of Power Electronics
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    • v.16 no.3
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    • pp.840-848
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    • 2016
  • A primary-side regulation AC-DC converter operating in the PFM (Pulse Frequency Modulation) mode with a high precision output current is designed, which applies a novel inductance compensation technique to improve the precision of the output current, which reduces the bad impact of the large tolerance of the transformer primary side inductance in the same batch. In this paper, the output current is regulated by the OSC charging current, which is controlled by a CC (constant current) controller. Meanwhile, for different primary inductors, the inductance compensation module adjusts the OSC charging current finely to improve the accuracy of the output current. The operation principle and design of the CC controller and the inductance compensation module are analyzed and illustrated herein. The control chip is implemented based on a TSMC 0.35μm 5V/40V BCD process, and a 12V/1.1A prototype has been built to verify the proposed control method. The deviation of the output current is within ±3% and the variation of the output current is less than 1% when the inductances of the primary windings vary by 10%.

Rapid Dynamic Response Flyback AC-DC Converter Design

  • Chang, Changyuan;Wu, Menglin;He, Luyang;Zhao, Dadi
    • Journal of Power Electronics
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    • v.18 no.6
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    • pp.1627-1633
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    • 2018
  • A constant voltage AC-DC converter based on digital assistant technology is proposed in this paper, which has rapid dynamic response capability. The converter operates in the PFM (Pulse Frequency Modulation) mode. According to the load state, the compensation current produced by the digital compensation module was injected into the CS pin to adjust the switching pulse width dynamically and improve the dynamic response. The control chip is implemented based on NEC $1{\mu}m$ 5V/40V HVCMOS process. A 5V/1.2A prototype has been built to verify the proposed control method. When the load jumps from idle to heavy, the undershoot time is only 7.4ms.

An Investigation of EMI Reduction Technique using the Spread Spectrum for an Automotive Power Converter (EMI 개선을 위해 자동차용 전력변환기에 적용된 주파수 확산 기법 분석)

  • Chae, Gyoo-Soo
    • Journal of the Korea Convergence Society
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    • v.9 no.2
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    • pp.1-6
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    • 2018
  • In this study, the investigation results of conducted and radiated emission for DC/DC converter circuit applied in electric vehicles are presented. A frequency spreading circuit was used to improve the EMI characteristics of a power converter designed by using MPQ4433 chip. The frequency spreading circuit using a TLV3201 chip was designed and applied to the power converter. A PCB was fabricated based on the EMI minimization procedures and simulated and measured results were presented for the far-field and near-field conducted and radiated emissions using the fabricated circuit. The measurement were done as CISPR 25 standardized test procedures. It is clearly showed that the EMI characteristics were improved 20% in case frequency spreading was applied. The EMI reduction technique using the frequency spreading proposed in this study was first applied to the design of power converter module for automobile. It is expected that the method presented here can be effectively used for EMI improvement in the future.

Compact T/R Module Having Improved T/R Isolation Using a Bias Timing Scheme (바이어스 타이밍 기법을 이용하여 송수신 격리도가 개선된 소형 송수신 모듈)

  • Park, Sung-Kyun;Lee, Hai-Young
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.23 no.12
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    • pp.1380-1387
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    • 2012
  • The transmit/receive(T/R) module is a key component in the active phased array system. The brick-type T/R module has been widely used and the miniaturization has been an important factor to get the flexibility of the system configuration. For the miniaturization, multi-function chips(MFC) having a common leg configuration are suitable to reduce the number of required MMICs and a high isolation between transmit and receive paths is necessary for the high gain T/R modules. In this work, we propose a bias timing scheme for the compact T/R module and show the optimum timing based on measurements, in order to improve the feed-back path loop problem and the consequent isolation problem of the common leg configuration. We have implemented high power(7 W/channel) and high T/R gain(35 dB transmit and 30 dB receive gains) within the half size($140{\times}80{\times}16mm^3$) of the conventional T/R modules.

Development, Validation, and Application of a Portable SPR Biosensor for the Direct Detection of Insecticide Residues

  • Yang, Gil-Mo;Cho, Nam-Hong
    • Food Science and Biotechnology
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    • v.17 no.5
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    • pp.1038-1046
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    • 2008
  • This study was carried out to develop a small-sized biosensor based on surface plasmon resonance (SPR) for the rapid identification of insecticide residues for food safety. The SPR biosensor module consists of a single 770 nm-light emitting diodes (LED) light source, several optical lenses for transferring light, a hemisphere sensor chip, photo detector, A/D converter, power source, and software for signal processing using a computer. Except for the computer, the size and weight of the sensor module are 150 (L)$\times$70 (W)$\times$120 (H) mm and 828 g, respectively. Validation and application procedures were designed to assess refractive index analysis, affinity properties, sensitivity, linearity, limits of detection, and robustness which includes an analysis of baseline stability and reproducibility of ligand immobilization using carbamate (carbofuran and carbaryl) and organophosphate (cadusafos, ethoprofos, and chlorpyrifos) insecticide residues. With direct binding analysis, insecticide residues were detected at less than the minimum 0.01 ppm and analyzed in less than 100 sec with a good linear relationship. Based on these results, we find that the binding interaction with active target groups in enzymes using the miniaturized SPR biosensor could detect low concentrations which satisfy the maximum residue limits for pesticide tolerance in Korea, Japan, and the USA.