• Title, Summary, Keyword: Charging circuit

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A study on the auto-charging circuit of the battery power units using trigger characteristics of semiconductor device (반도체 스위칭 소자의 트리거 특성을 이용한 배터리 자동 충전회로에 관한 연구)

  • 김영민;황종선;박성진;임종연;송승호
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.519-522
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    • 2001
  • Recently, the battery charging technology and reducing technology of harmonics on AC input line are rising importantly according to increasing electrical facilities that it has been replaced battery with emergency power. In this study, I proposed that an auto-charging circuit of battery has low cost with simple-construction circuit, relative, harmonics reduction with diode tap-change method, high reliability of system for using characteristics of thyristor switching. In case of this circuit, convenience and reliability of maintenance of battery power units were more improved. 1 think that it is resulted in effect of prevention to shortening of battery life from over-charging and over-discharging and decrease of harmonics obstacle on AC input line.

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Accurate Tunable-Gain 1/x Circuit Using Capacitor Charging Scheme

  • Yang, Byung-Do;Heo, Seo Weon
    • ETRI Journal
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    • v.37 no.5
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    • pp.972-978
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    • 2015
  • This paper proposes an accurate tunable-gain 1/x circuit. The output voltage of the 1/x circuit is generated by using a capacitor charging time that is inversely proportional to the input voltage. The output voltage is independent of the process parameters, because the output voltage depends on the ratios of the capacitors, resistors, and current mirrors. The voltage gain of the 1/x circuit is tuned by a 10-bit digital code. The 1/x circuit was fabricated using a $0.18{\mu}m$ CMOS process. Its core area is $0.011mm^2$ ($144{\mu}m{\times}78{\mu}m$), and it consumes $278{\mu}W$ at $V_{DD}=1.8V$ and $f_{CLK}=1MHz$. Its error is within 1.7% at $V_{IN}=0.05V$ to 1 V.

Control Scheme of Emergency Power Supply for Elevator Emergency Call System (승강기의 비상 통화장치용 비상 전원장치의 충·방전 제어회로)

  • Park, Noh-Sik;Lee, Dong-Hee
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.29 no.8
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    • pp.40-48
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    • 2015
  • In this paper, battery charging and discharging circuit with a single voltage power supply is proposed. The proposed circuit has the separated current path and charging-monitoring sequence control scheme. In the charging sequence, the proposed 2-level comparator combined with control signal of the micro-processor can control the constant charging current to protect the over current of the battery. Furthermore, the proposed circuit uses a periodic main power switch control to detect the discharging characteristics to estimate the approximated battery life-time. In the experiments, the proposed emergency power supply for emergency call system has 89% efficiency with 98% power factor. And the proposed sequence control scheme is well operated in the designed emergency power system.

300kV DC Charging system for Synthetic Testing Facility (합성 차단 시험용 DC300kV 충전장치 개발)

  • Rim, G.H.;Choi, Y.W.;Park, J.M.;Park, K.Y.;Lee, W.Y.;Chung, J.K.
    • Proceedings of the KIEE Conference
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    • pp.1354-1356
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    • 2000
  • This paper deals with a 300kV dc charging system to be used ?s a voltage source in a circuit breaker synthetic short-circuit-test facility. Cockcroft-walton circuit is used to step up the rectified voltage from a single phase transformer of which primary winding is hooked up to an ac220 wall plug. Two systems with the same ratings have been designed and manufactured. The two system have been made of different supporting structure with different insulating materials. The paper describes a couple of charging schemes, system configurations and the synthetic test circuit in which the developed system is to be used.

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A Simple-Structured DC Solid-State Circuit Breaker with Easy Charging Capability (충전 동작이 용이한 간단한 구조의 DC 반도체 차단기)

  • Kim, Jin-Young;Kim, In-Dong
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.66 no.11
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    • pp.1575-1583
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    • 2017
  • With the development of DC distribution, DC circuit breaker is required to ensure the stability of the DC grid. Unlike a mechanical circuit breaker that blocks after several tens of milliseconds, a DC SSCB(Solid-State Circuit Breaker) can break the fault well within 1 [ms], so it can prevent the damage of accident. However, the previous DC SSCB requires a lot of switching elements for charging commutation capacitors, and the control is complicated. Therefore, this paper proposes a new DC SSCB suitable for DC grid. The proposed DC SSCB is simple to control for charging commutation capacitors, and it can perform the rapid breaking and operating duty of reclosing and rebreaking. The proposed DC SSCB was designed to 380 [V] and 5 [kW] class which is suitable for residential DC distribution, and the operating characteristics of the proposed DC SSCB were verified by simulations and experiments. It is anticipated that the proposed DC SSCB may be utilized to design and realize DC grid system.

Transition Control of Standby and Operation Modes of Wireless Charging System for Inspection Robots

  • Liu, Han;Tan, Linlin;Huang, Xueliang;Czarkowski, Dariusz
    • Journal of Power Electronics
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    • v.19 no.3
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    • pp.691-701
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    • 2019
  • To solve the problems in the contact charging of inspection robots, a wireless charging system for inspection robots and a control strategy are introduced in this paper. Circuit models of a wireless power system with a compound compensation circuit and a three-phase Class-D resonant inverter are set up based on circuit theory. An output voltage control method based on the equal spread regulation of the phase difference between adjacent phases and the parameter correction method in the primary compound compensation circuit are proposed. The dynamic characteristics of the key parameters varying with the secondary coil position are obtained to further investigate the adaptive location scheme during the access and exit processes of moving robots. Combining the output voltage control method and the adaptive location scheme, a transition control strategy for the standby and operation modes of the wireless charging systems for inspection robots is put forward to realize the system characteristics including the low standby power in the standby mode and the high receiving power in the operation mode. Finally, experiments are designed and conducted to verify the correctness of the theoretical research.

A Capacitor Charging Power Supply(CCPS) using Dead Time Control Circuit for Stable High Repetition (안정적 고반복을 위한 지연시간 제어회로가 적용된 커패시터 충전용 전원장치)

  • Lim, Tae Hyun;Hwang, Sun Mook;Kook, Jeong Hyeon;Yim, Dong Woo
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.66 no.1
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    • pp.55-60
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    • 2017
  • Capacitor Charging Power Supply(CCPS) is one of the most important components of a pulsed power system. The CCPS is widely used in source of lasers, accelerators and plasma generators. This paper presents design of a dead time control circuit and operation characteristics for stable high repetition rate of high voltage CCPS. The CCPS consists of battery, high voltage transformer and controller with a dead time control circuit. A dead time control circuit was simulated by PSpice. The performance test of the CCPS was carried out with a 7[nF] load capacitor at output voltage of 50[kV] and a pulse repetition frequency of 100[Hz]. As a result, we can verify that charging and discharging waveform is stable at 100[Hz]. The experiment results indicate that 3[ms] dead time made it possible for stable high repetition rate of 100[Hz]. This paper paves the way for designing an advanced CCPS which is more applicable outside experiments.

Parameter Tuning of Wireless Charging Circuit using Switched-Capacitor (스위치드-커패시터를 이용한 무선충전회로의 파라미터 튜닝)

  • Kim, Myoung-Su;Kang, Byeong-Geuk;Chung, Se-Kyo
    • Proceedings of the KIPE Conference
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    • pp.315-316
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    • 2013
  • This paper presents a parameter tuning method of a LLC resonant converter for a wireless charging circuit. A switched-capacitor is used to change the resonant frequency of the resonant circuit. The simulation results verify that the efficiency of the power transfer can be improved by a duty control of the switched-capacitor for various values of the coupling coefficient.

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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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    • 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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Prediction of EFT/B Signal Transfer Characteristics in Mobile Charging Circuit (모바일 충전회로에서 EFT/B 신호의 전달특성 예측에 대한 연구)

  • Song, SeungJae;Kim, Kwangho;Jo, Jeongmin;Lee, Seungbae;Kim, So-young;Nah, Wansoo
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.26 no.10
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    • pp.895-906
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    • 2015
  • This paper presents a methodology and a model that can analyze the high frequency transfer characteristics from socket in the AC power port to the 5 V DC output port in the mobile charging circuit. This is to predict the output signals coming from the IEC(International Electrotechnical Commission) Standard(IEC 61000-4-4), EFT/B(Electric Fast Transient and Burst) immunity test for mobile charging circuit. Since the mobile charging circuit is energized from the AC power socket from the power line, it is necessary to know the high frequency transfer characteristics with activated AC power line. A simple CDN(Coupling-Decoupling Network) is designed and manufactured for measuring S-parameters of mobile charging circuit with and without AC power line activated. The result shows that the S-parameters of the specific mobile charging circuits are almost the same, independent of AC power line activation. Consequently, the S-parameters without AC line could be used to predict the output response to the EFT/B signals, and it was shown that the proposed methodology predicts the output responses quite accurately, which proves the validness of the methodology presented in this paper.