• Title/Summary/Keyword: Constant current

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An Improved Battery Charging Algorithm for PV Battery Chargers (태양광 배터리 충전기를 위한 개선된 충전 알고리즘)

  • Kim, Jung-Hyun;Jou, Sung-Tak;Lee, Kyo-Beum
    • The Transactions of the Korean Institute of Power Electronics
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    • v.18 no.6
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    • pp.507-514
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    • 2013
  • In this paper, the proposed charging algorithm is converted from the charging mode to compensate the transient state in the solar battery charging system. The maximum power point tracking (MPPT) control methods and the various charging algorithms for the optimal battery charging are reviewed. The proposed algorithm has excellent transient characteristics compare to the previous algorithm by adding the optimal control method to compensate the transient state when the charging mode switches from the constant current mode to the constant voltage mode based on the conventional constant-current constant-voltage (CC-CV) charging algorithm. The effectiveness of the proposed method has been verified by simulations and experimental results.

A Comparison of Constant Current and Constant Voltage Control in LED Driver (LED driver에서의 정전류 및 정전압 제어의 비교 연구)

  • Han, Soo-Bin;Park, Suck-In;Jung, Hak-Kun;Song, Eu-Gine;Jung, Bong-Man
    • Proceedings of the KIPE Conference
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    • 2010.07a
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    • pp.83-84
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    • 2010
  • This paper reviews the performance difference between constant voltage control and constant current control in LED driver. Simulations of both control methods are performed for performance comparison especially with temperature variation. The results show that constant current control method is inherently better than constant voltage control for LED drive.

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Constant Current & Constant Voltage Battery Charger Using Buck Converter (벅 컨버터를 이용한 정전류 정전압 배터리 충전기)

  • Awasthi, Prakash;Kang, Seong-Gu;Kim, Jeong-Hun;Park, Sung-Jun
    • Proceedings of the KIPE Conference
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    • 2012.07a
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    • pp.399-400
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    • 2012
  • The proposed battery charger presented in this paper is suitable for Lead-Acid Battery and the dc/dc buck converter topology is applied as a charger circuit. The technique adopted in this charger is constant current & constant voltage dual mode, which is decided by the value of voltage of proposed battery. Automatic mode change function is detected by the percentage value of level of battery charging. CC Mode (Constant Current Mode) is operated when charging level is below 80% of the total charging of Battery voltage and above 80% of battery voltage charging, CV Mode (Constant Voltage Mode) is automatically operated. As the charging level exceeds 120%, it automatically terminates charging. The feedback signal to the PWM generator for charging the battery is controlled by using the current and voltage measurement circuits simultaneously. This technique will degrade the damage of proposed type of battery and improve the power efficiency of charger. Finally, a prototype charger circuit designed for a 12-V 7-Ah lead acid battery is constructed and tested to confirm the theoretical predictions. Satisfactory performance is obtained from simulation and the experimental results.

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A Study on SOA Driver with Capability to Control Current and Temperature Transient Response (온도 및 전류의 과도응답 제어가 가능한 SOA Driver에 관한 연구)

  • Eom, Jinseob
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.28 no.2
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    • pp.1-8
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    • 2014
  • In this paper, SOA Current and Temperature Driver which consisted of LabVIEW programming part capable of current and temperature transient response pattern design, DAQ module for analog voltage in&out, and voltage to current converting chips has realized. The output current(possible to 3A) from the Driver to SOA was clearly constant without ripple and also showed no variance until 1mA unit for a long time operation. The temperature of TEC took several seconds to reach a set temperature, and were maintained stably within ${\pm}^0.1{\circ}C$ for several hours. The proposed Driver can replace the previous high cost SOA Drivers for wavelength swept lasers fully and provides the convenience of transient response design capability for current and temperature.

Stability Analysis ofn HTS Current Lead with Constant Safety Factor (안전율이 일정한 초전도 전류도입선의 안정성해석)

  • Seol, Seoung-Yun
    • Progress in Superconductivity and Cryogenics
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    • v.2 no.2
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    • pp.15-19
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    • 2000
  • The stability of variable cross-sectional area HTS current lead is considered. The cross-sectional area is varied to have a constant safety factor which is defined as the ratio of operating current and critical current of superconductor. As the constant area HTS lead, the variable cross-sectional area HTS lead also has three steady states above the bifurcation point and only one steady state below the bifurcation point. The temperature profiles and current sharing ratios for each steady state are calculated. The heat dissipation into cryogenic system for super-conducting, intermediate, and upper states are compared. For Bi-2333 sheathed with silver-gold alloy 2m length of current lead, and the maximum temperature of upper state seems to be burn-out free below 5m length.

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A Constant Current Regulated Inverter System for Lighting and Beaconing of Aerodromes (항공관제용 정전류조정(CCR) 인버터 시스템의 개발)

  • Shon, Jin-Geun;Park, Jong-Chan
    • Proceedings of the KIEE Conference
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    • 2006.10b
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    • pp.141-146
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    • 2006
  • According as level of industry develops day after day, electricity load system of industry requires high level control, effectiveness and high efficiency. Among supply and control unit of suitable power supply in these load characteristic, inverter systems of constant current regulate is used widely control of lighting and electric heating system. Therefore, in this paper proposed an inverter systems with constant current regulation and power factor correction (PFC) circuit for Lighting and Beaconing of Aerodromes. The effectiveness of the proposed system confirmed through experimental results of CCR.

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LCL Resonant Compensation of Movable ICPT Systems with a Multi-load

  • Hua, Jie;Wang, Hui-Zhen;Zhao, Yao;Zou, Ai-Long
    • Journal of Power Electronics
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    • v.15 no.6
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    • pp.1654-1663
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    • 2015
  • Compared to LC resonance, LCL resonance has distinct advantages such as a large resonant capability, low voltage and current stresses of the power device, constant voltage or current output characteristics, and fault-tolerance capability. Thus, LCL resonant compensation is employed for a movable Inductive Contactless Power Transfer (ICPT) system with a multi-load in this paper, which achieves constant current output characteristics. Peculiarly, the primary side adopts a much larger compensation inductor than the primary leakage inductor to lower the reactive power, reduce the input current ripple, generate a large current in the primary side, and realize soft-switching. Furthermore, this paper proposes an approximate resonant point for large inductor-ratio LCL resonant compensation through fundamental wave analysis. In addition, the PWM control strategy is used for this system to achieve constant current output characteristics. Finally, an experimental platform is built, whose secondary E-Type coils can ride and move on a primary rail. Simulations and experiments are conducted to verify the effectiveness and accuracy of both the theory and the design method.

Optimal Design of Multi-Step Current Leads Using HTS Tapes (고온초전도 테이프를 이용한 다단 전류 도입선의 최적설계)

  • 김민수;나필선;설승윤
    • Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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    • 2001.02a
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    • pp.84-88
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    • 2001
  • The optimum cross-sectional area Profile of gas-cooled high-temperature superconductor (HTS) current lead is analyzed to have minimum helium boil-off rate. The conventional constant area HTS lead has much higher helium consumption than the optimum HTS lead considered in this study. The optimum HTS lead has variable cross-sectional area to have constant safety factor. An analytical formula of optimum shape of lead and temperature profile are obtained. For multi-step HTS current leads, the optimum tape lengths and minimum heat dissipation rate are also formulated. The developed formulations are applied to the Bi-2223 material, and the differences between constant area, constant safety-factor, and multi-step current leads are discussed.

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A Power Supply System for Lighting of Aerodromes by Using Power Factor Correction and Constant Current Regulator (PFC 및 CCR에 의한 항공조명용 전원공급장치의 개발)

  • Shon, Jin-Geun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.12
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    • pp.2150-2156
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    • 2007
  • According as level of industry develops day after day, electricity load system of industry requires high level control, effectiveness and high efficiency. Among supply and control unit of suitable power supply in these load characteristic, inverter systems of constant current regulate is used widely control of lighting and electric heating system. But, problems that power factor deterioration and fast response of control, efficiency, harmonics and etc are still remain. Therefore, in this paper proposed an inverter systems with constant current regulation and power factor correction (PFC) circuit for lighting and beaconing of aerodromes. The effectiveness of the proposed system confirmed through experimental results of 10[kW] power supply system.

The rotor time constant compensation in sensorless vector control using stator current based MRAC (고정자 전류 기반의 MRAC를 이용한 유도전동기의 센서리스 벡터제어에서 회전자 시정수의 보상)

  • Park Chul-woo;Youn Kyung-sup;Im Sung-woon;Ku Bon-ho;Kwon Woo-hyen
    • Proceedings of the KIPE Conference
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    • 2002.07a
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    • pp.192-195
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    • 2002
  • The thesis proposes the sensorless vector control method that estimates the rotor speed and rotor time constant at the same time using stator current. In the proposed method, stator current error in the stationary reference frame is proportional to estimated speed error, and stator current error in the synchronous reference frame is proportional to estimated rotor time constant error. The proposed method can simultaneously produce a fast speed estimation and rotor time constant estimation. Therefore, this new method offers an improvement in the performance of a sensorless vector controller. And, the superiority of the proposed method is verified by simulation.

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