• Title/Summary/Keyword: Low voltage operation

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Design of PLL for Low Voltage and High Speed Operation (저전압, 고속동작을 하는 위상 동기 루프(PLL)의 설계)

  • 조용덕;윤영승유상대
    • Proceedings of the IEEK Conference
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    • 1998.10a
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    • pp.1097-1100
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    • 1998
  • In this paper, the PLL(Phase-Locked Loops) for low voltage and high speed operation is described. In other to obtaining above objects, new CMOS circuit technologies have been used in the each block circuit of PLL. It operates with a lock range from 110 up to 700 MHz and has a peak to peak jitter of 50 ps at operating frequency of 250 MHz. It was fabricated in a $0.6\mu\textrm{m}$ CMOS technology and dissipated 45 mW from a single 3.3V.

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A Low Voltage Bandgap Current Reference with Low Dependence on Process, Power Supply, and Temperature

  • Cheon, Jimin
    • Journal of Advanced Information Technology and Convergence
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    • v.8 no.2
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    • pp.59-67
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    • 2018
  • The minimum power supply voltage of a typical bandgap current reference (BGCR) is limited by operating temperature and input common mode range (ICMR) of a feedback amplifier. A new BGCR using a bandgap voltage generator (BGVG) is proposed to minimize the effect of temperature, supply voltage, and process variation. The BGVG is designed with proportional to absolute temperature (PTAT) characteristic, and a feedback amplifier is designed with weak-inversion transistors for low voltage operation. It is verified with a $0.18-{\mu}m$ CMOS process with five corners for MOS transistors and three corners for BJTs. The proposed circuit is superior to other reported current references under temperature variation from $-40^{\circ}C$ to $120^{\circ}C$ and power supply variation from 1.2 V to 1.8 V. The total power consumption is $126{\mu}W$ under the conditions that the power supply voltage is 1.2 V, the output current is $10{\mu}A$, and the operating temperature is $20^{\circ}C$.

A Study on the Characteristics for Power Capacitor under the Voltage Unbalance Operation (불평형 전압 운전시의 역률보상용 커패시터 특성 연구)

  • Kim, Il-Jung;Kim, Jong-Gyeum
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.57 no.1
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    • pp.36-40
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    • 2008
  • Most of the low-voltage feeder are designed with approximately balanced and connected at the three phase four wire systems. However, Most of the power distribution systems' load which is composed of single or three phase are unbalanced by generating load unbalance. Unbalanced current will draw a highly unbalanced voltage. The power factor of an induction motor at rated operation is between 25 and 90%, depending on the size and speed of the motor. However, many induction motors operate below the nominal rating, resulting in poor power factor. This condition needs power factor improvement. Addition of power capacitor at the motor terminal may draw to stress due to voltage unbalance. This paper presents operation characteristics on steady states of a three-phase induction motor under unbalanced voltages with power capacitor. The existence of voltage unbalance have an effect on stress of power capacitor.

A New Low Loss Quasi Parallel Resonant DC-Link Inverter with Variable Lossless Zero Voltage Duration (무손실 가변 영전압 구간을 갖는 새로운 저손실 준 병렬공진 직류-링크 인버터)

  • 권경안;김권호;최익;정용채;박민용
    • The Transactions of the Korean Institute of Power Electronics
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    • v.2 no.2
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    • pp.8-18
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    • 1997
  • In this paper, a New Low Loss Quasi-Parallel Resonant DC-Link(NLQPRDCL) Inverter which shows highly improved PWM capability, low loss characteristic and low voltage stress is presented. A method to minimize freewheeling interval, which is able to largely decrease DC-link operation losses and to steadily guarantee soft switching in the wide operation region is also proposed. In addition, lossless control of zero voltage duration of DC-link makes the proposed inverter maintain the advanced PWM capability even under a very low modulation index. Experiment and simulation were performed to verify validity of the proposed inverter topology.

Voltage Quality Analysis of Low Voltage Customer Connected to the Wind Generation System (풍력발전시스템에 연계된 저압수용가의 전압품질 분석)

  • Kim Moon Chan;Kim Hyun Jong;Kim Tae Ik;Yang Ik Jun;Na Kyoung Yun;Kim Se Ho
    • Proceedings of the KIEE Conference
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    • summer
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    • pp.233-235
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    • 2004
  • Operation of wind turbines has impacts on the voltage quantity at the connected electricity network. Increasing penetration of wind energy makes necessary to study the power quality regarding voltage variations(sag, swell, interruption) and presence of harmonics in the id. This paper investigates the voltage quality of low voltage customers connected to wind generation system. To study the influences of wind power generation to low voltage power system, voltage data are collected in three house using PQM(Power Quality Monitoring) equipment during one month and analyzed regarding voltage variation and harmonics

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A New Current-Fed Isolated Boost Converter for Battery Powered Applications (축전지 구동 응용을 위한 새로운 승압형 DC/DC 컨버터)

  • 노정욱;한승훈;윤명중
    • Proceedings of the KIPE Conference
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    • 1999.07a
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    • pp.646-649
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    • 1999
  • A new isolated boost dc to dc convertor suitable for a low input voltage application is proposed. The proposed convertor features the low switch current stresses, the wide input voltage range operation, and the inherent inrush current protection characteristics, essential to design a low to high voltage conversion circuit. A comparative analysis and experimental results are presented to show the validity of the proposed convertor.

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Verification of Hi9h Impedance Fault Relay through Low Voltage Power System Implementation (저압모의계통 구성을 통한 고저항지락사고 검출용 계전기의 실계통 적응성 검증)

  • Hong, Sun-Chun;Jang, Byung-Tae;Yoo, Heung-Jun
    • Proceedings of the KIEE Conference
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    • 1999.07c
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    • pp.1437-1439
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    • 1999
  • This paper describes test method though low voltage power system implementation for high impedance fault relay test before its operation in real power system. Through this test, relay tested its function and algorithm. In this paper, we will provides test method using low voltage power system and its results.

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Novel Non-Isolated DC-DC Converter Topology with High Step-Up Voltage Gain and Low Voltage Stress Characteristics Using Single Switch and Voltage Multipliers (단일 스위치와 전압 체배 회로를 이용하는 고변압비와 낮은 전압 스트레스를 가진 새로운 비절연형 DC-DC 컨버터 토폴로지)

  • Tran, Manh Tuan;Amin, Saghir;Choi, Woojin
    • Proceedings of the KIPE Conference
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    • 2019.07a
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    • pp.83-85
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    • 2019
  • The use of high voltage gain converters is essential for the distributed power generation systems with renewable energy sources such as the fuel cells and solar cells due to their low voltage characteristics. In this paper, a high voltage gain topology combining cascode Inverting Buck-Boost converter and voltage multiplier structure is introduced. In proposed converter, the input voltage is connected in series at the output, the portion of input power is directly delivered to the load which results in continuous input current. In addition, the voltage multiplier stage stacked in proper manner is not only enhance high step-up voltage gain ratio but also significantly reduce the voltage stress across all semiconductor devices and capacitors. As a result, the high current-low voltage switches can be employed for higher efficiency and lower cost. In order to show the feasibility of the proposed topology, the operation principle is presented and the steady-state characteristic is analyzed in detail. A 380W-40/380V prototype converter was built to validate the effectiveness of proposed converter.

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Voltage Angle Control of an IPMSM for Electric Vehicle Drives (전기자동차 구동을 위한 IPMSM의 전압각 제어)

  • Ko, Tae-Hoon;Kim, Sang-Hoon
    • The Transactions of the Korean Institute of Power Electronics
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    • v.22 no.5
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    • pp.397-403
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    • 2017
  • This paper studies the voltage angle control of interior permanent magnet synchronous motors (IPMSMs). For voltage angle control, the optimum voltage angle trajectory according to the operating speed is researched while the voltage and current limit conditions are considered. Through research, two different optimum voltage angle trajectories that depend on the design of IPMSMs were found. The IPMSM drive based on a voltage angle control that follows such trajectory is proposed. Unlike the conventional voltage angle control method, which is applied only in the flux-weakening region, the proposed voltage angle control can be implemented in all operation ranges from low to high speed. The proposed method is verified by experiments using a DSC controller for 800 W IPMSM.

A Smooth LVRT Control Strategy for Single-Phase Two-Stage Grid-Connected PV Inverters

  • Xiao, Furong;Dong, Lei;Khahro, Shahnawaz Farhan;Huang, Xiaojiang;Liao, Xiaozhong
    • Journal of Power Electronics
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    • v.15 no.3
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    • pp.806-818
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    • 2015
  • Based on the inherent relationship between dc-bus voltage and grid feeding active power, two dc-bus voltage regulators with different references are adopted for a grid-connected PV inverter operating in both normal grid voltage mode and low grid voltage mode. In the proposed scheme, an additional dc-bus voltage regulator paralleled with maximum power point tracking controller is used to guarantee the reliability of the low voltage ride-through (LVRT) of the inverter. Unlike conventional LVRT strategies, the proposed strategy does not require detecting grid voltage sag fault in terms of realizing LVRT. Moreover, the developed method does not have switching operations. The proposed technique can also enhance the stability of a power system in case of varying environmental conditions during a low grid voltage period. The operation principle of the presented LVRT control strategy is presented in detail, together with the design guidelines for the key parameters. Finally, a 3 kW prototype is built to validate the feasibility of the proposed LVRT strategy.