• Title/Summary/Keyword: low power mode

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Two-mode tracking system control of PV generation for efficiency improvement (태양광 발전의 효율 향상을 위한 이중모드 추적 시스템 제어)

  • Jang, Mi-Geum;Ko, Jae-Sub;Choi, Jung-Sik;Baek, Jung-Woo;Kang, Sung-Joon;Chung, Dong-Hwa
    • Proceedings of the KIEE Conference
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    • 2009.07a
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    • pp.1082_1083
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    • 2009
  • This paper proposes two-mode tracking system control algorithm to improve efficiency of PV system. Two-mode control algorithm tracks sun position using sensor method and program method with insolation condition. Also, in this case that insolation is very low, tracking system is controlled by environment mode to reduce the power loss. Proposed algorithm is applied the PV system and analyzes the generation value. And this algorithm proves the validity of this paper through the experimental result.

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A Study on Sensorless Control of PMSM using Sliding Mode Observer in high speed range (슬라이딩 모드 관측기를 이용한 고속 영역에서의 PMSM 센서리스 제어에 관한 연구)

  • Kang K.L.;Kim Jang-Mok;Lee S.H.;Hwag K.B.;Kim K.H.
    • Proceedings of the KIPE Conference
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    • 2003.07b
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    • pp.745-749
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    • 2003
  • The iterative sliding mode observer is proposed to control sensorless PMSM(Permanent Magnet Synchronous Motor). Proposed sliding mode observer has the character which is robust to the disturbance and parameter variation. Low pass filter with the variable cutoff frequency is also proposed to compensate rotor angle, it is led to saving memory and minimizing operation time. Experimental results shows that the proposed sliding mode observer leads to the proper performance.

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Improved full wave mode ZVT-PWM DC-DC Converters (개선된 전파형 ZVT-PWM DC-DC 컨버터)

  • Kim T.W.;Kang A.J.;Chin G.H.;Kim H.S.
    • Proceedings of the KIPE Conference
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    • 2003.07b
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    • pp.777-780
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    • 2003
  • In this paper, an improved full wave mode ZVT-PWM DC-DC Converter is presented to maximize the regeneration ratio of resonant energy by only putting an additional diode in series with auxiliary switch. The operation of auxiliary switch in a half wave mode makes possible the soft switching condition of all switches. Furthermore, the increase of the regeneration ratio to resonant energy results in low conduction losses and minimum voltage and current stresses. The operation principles of the proposed converters are analyzed using the PWM boost converter topology as an example. Theoretically analysis and experimental results verify the validity of the boost converter topology with the proposed full wave mode ZVT-PWM converters

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The design, construction and operational characteristics of the superconducting persistent current switch (초전도 영구전류스위치의 설계. 제작 및 특성시험)

  • 오윤상;이상진;최경달;류강식;고태국
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.45 no.2
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    • pp.193-198
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    • 1996
  • Low power superconducting persistent current switch(PCS) for the superconducting magnet systems in the persistent mode was developed and its experimental results were analyzed when the system was charged or discharged. The multifilament NbTi wire with Cu matrix was used for the PCS. The constructed NbTi superconducting switch with superconducting magnet system operated successfully. It also operated on-off switching action with good stabilization. The maximum operating current in persistent mode was 60A (at 1T). In persistent current mode, the decay of the persistent current at 60A was observed. Its decay was 3.55% in 60 min. It is possible to make the persistent current switch with the better decaying of persistent current if some problems for joint resistance are solved.

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A design of the high efficiency PMIC with DT-CMOS switch for portable application (DT-CMOS 스위치를 사용한 휴대기기용 고효율 전원제어부 설계)

  • Ha, Ka-San;Lee, Kang-Yoon;Ha, Jae-Hwan;Ju, Hwan-Kyu;Koo, Yong-Seo
    • Journal of IKEEE
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    • v.13 no.2
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    • pp.208-215
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    • 2009
  • The high efficiency power management IC(PMIC) with DT-CMOS(Dynamic Threshold voltage MOSFET) switching device for portable application is proposed in this paper. Because portable applications need high output voltages and low output voltage, Boost converter and Buck converter are embedded in One-chip. PMIC is controlled with PWM control method in order to have high power efficiency at high current level. DTMOS with low on-resistance is designed to decrease conduction loss. Boost converter and Buck converter, are based on Voltage-mode PWM control circuits and low on-resistance switching device, achieved the high efficiency near 92.1% and 95%, respectively, at 100mA output current. And Step-down DC-DC converter in stand-by mode below 1mA is designed with LDO in order to achive high efficiency.

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Dual-Level LVDS Circuit with Common Mode Bias Compensation Technique for LCD Driver ICs (공통모드 전압 보정기능을 갖는 LCD 드라이버용 듀얼모드 LVDS 전송회로)

  • Kim Doo-Hwan;Kim Ki-Sun;Cho Kyoung-Rok
    • The Journal of the Korea Contents Association
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    • v.6 no.3
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    • pp.38-45
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    • 2006
  • A dual-level low voltage differential signalling (DLVDS) circuit is proposed aiming at reducing transmission lines for a LCD driver IC. We apply two data to the proposed DLVDS circuit as inputs. Then, the transmitter converts two inputs to two kinds of fully differential signals. In this circuit, two transmission lines are sufficient to transfer two inputs while keeping the LVDS feature. However, the circuit has a common mode bias fluctuation due to difference of the input bias and the reference bias. We compensate the common mode bias fluctuation using a feedback circuit of the current source bias. The receiver recovers the original input data through a level decoding circuit. We fabricated the proposed circuit using $0.25{\mu}m$ CMOS technology. The simulation results of proposed circuit shows 1-Gbps/2-line data rate and 35mW power consumption at 2.5V supply voltage, respectively.

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Performance Improvement of Current Memory for Low Power Wireless Communication MODEM (저전력 무선통신 모뎀 구현용 전류기억소자 성능개선)

  • Kim, Seong-Kweon
    • The Journal of the Korea institute of electronic communication sciences
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    • v.3 no.2
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    • pp.79-85
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    • 2008
  • It is important to consider the life of battery and low power operation for various wireless communications. Thus, Analog current-mode signal processing with SI circuit has been taken notice of in designing the LSI for wireless communications. However, in current mode signal processsing, current memory circuit has a problem called clock-feedthrough. In this paper, we examine the connection of CMOS switch that is the common solution of clock-feedthrough and calculate the relation of width between CMOS switch for design methodology for improvement of current memory. As a result of simulation, when the width of memory MOS is 20um, ratio of input current and bias current is 0.3, the width relation in CMOS switch is obtained with $W_{Mp}=5.62W_{Mn}+1.6$, for the nMOS width of 2~6um in CMOS switch. And from the same simulation condition, it is obtained with $W_{Mp}=2.05W_{Mn}+23$ for the nMOS width of 6~10um in CMOS switch. Then the defined width relation of MOS transistor will be useful guidance in design for improvement of current memory.

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A Study on Storing Node Addition and Instance Leveling Using DIS Message in RPL (RPL에서 DIS 메시지를 이용한 Storing 노드 추가 및 Instance 평준화 기법 연구)

  • Bae, Sung-Hyun;Yun, Jeong-Oh
    • Journal of IKEEE
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    • v.22 no.3
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    • pp.590-598
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    • 2018
  • Recently, interest in IoT(Internet of Things) technology, which provides Internet services to objects, is increasing. IoT offers a variety of services in home networks, healthcare, and disaster alerts. IoT with LLN(Low Power & Lossy Networks) feature frequently loses sensor node. RPL, the standard routing protocol of IoT, performs global repair when data loss occurs in a sensor node. However, frequent loss of sensor nodes due to lower sensor nodes causes network performance degradation due to frequent full path reset. In this paper, we propose an additional selection method of the storage mode sensor node to solve the network degradation problem due to the frequent path resetting problem even after selecting the storage mode sensor node, and propose a method of equalizing the total path resetting number of each instance.

Design of Border Surveillance and Control System Based on Wireless Sensor Network (WSN 기반 국경 감시 및 제어 시스템 설계)

  • Hwang, Bo Ram;An, Sun Shin
    • KIPS Transactions on Computer and Communication Systems
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    • v.4 no.1
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    • pp.11-14
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    • 2015
  • WSN (Wireless Sensor Network) based on low-power is one of the core technologies in the ubiquitous society. In this paper, we present a border surveillance and control system in WSN environment. The system consists of static sensor node, mobile sensor node, static gateway, mobile gateway, server and mobile application. Mobile applications are divided into user mode and manager mode. So users monitor border surveillance through mobile phone and get information of border network environment without time and space constraints. In manager mode, for the flexible operation of nodes, manager can update to the software remotely and adjust the position of the mobile node. And also we implement a suitable multi-hop routing protocol for scalable low-power sensor nodes and confirm that the system operates well in WSN environment.

The Characteristics and Technical Trends of Power MOSFET (전력용 MOSFET의 특성 및 기술동향)

  • Bae, Jin-Yong;Kim, Yong
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.7
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    • pp.1363-1374
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    • 2009
  • This paper reviews the characteristics and technical trends in Power MOSFET technology that are leading to improvements in power loss for power electronic system. The silicon bipolar power transistor has been displaced by silicon power MOSFET's in low and high voltage system. The power electronic technology requires the marriage of power device technology with MOS-gated device and bipolar analog circuits. The technology challenges involved in combining power handling capability with finger gate, trench array, super junction structure, and SiC transistor are described, together with examples of solutions for telecommunications, motor control, and switch mode power supplies.