• 제목/요약/키워드: Input Current Improvement

검색결과 182건 처리시간 0.027초

상호정보 에너지와 델타함수 기반의 알고리즘에서 크기 조절된 입력의 전력변화에 대한 연구 (A Study on Power Variations of Magnitude Controlled Input of Algorithms based on Cross-Information Potential and Delta Functions)

  • 김남용
    • 인터넷정보학회논문지
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    • 제18권6호
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    • pp.1-6
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    • 2017
  • 이 논문에서는 충격성 잡음환경에서 탁월한 성능을 보이는 CIPD 알고리즘에 대해, 오차에 대한 가우시안 커널로 입력이 보정된 MCI의 전력 추이를 가중치 갱신 방정식에 반영한 새로운 방식을 제안하였다. 제안한 알고리즘이 기존의 CIPD 알고리즘보다 우수한 성능을 가지는지 평가하기 위해, 각 알고리즘의 가중치 벡터 변화량이 얼마나 충격성 잡음에 강인한가를 충격성 잡음하에서 비교하였으며, 실험 결과에서 2배 이상의 정상상태 안정성 향상, 약 1.8배 빠른 수렴속도와 약 2dB 정도 더 낮은 최소 MSE 값을 나타냈다.

공진회로(共振回路)를 이용한 유도가열용(誘導加熱用) 부분순환전류형(部分循環電流形) 사이크로콘버터에 관한 연구(硏究) (A Study of the Partial Circulating Current Type Cycloconverter with a Resonant Circuit for Induction Heating)

  • 김현중;조규민;김영석
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1992년도 하계학술대회 논문집 B
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    • pp.1002-1004
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    • 1992
  • This paper presents a study of the partial circulating current type cycloconverter with a resonant circuit for induction heating. A method of input power factor improvement is proposed. Since the circulating currents flow through the circulating current reactors, the out-put currents are continuous and sinusoid. The proposed cycloconverter can keep the displacement factor at 1.0 by PWM control method regardless of load. The control functions are derived, the operational principles are described and the simulation and experimental results are presented.

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에어컨용 부분공진 스위칭 컨버터의 역률개선 (Improvement in Power Factor of Partial Switching Converter for air-conditioner)

  • 서기영;이현우;고태언;김영문;문상필;장우신
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1999년도 하계학술대회 논문집 F
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    • pp.2662-2664
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    • 1999
  • To improve the current waveform of diode rectifiers, we propose a new operating principle for the voltage diode rectifiers. In the conventional voltage rectifier circuit, relatively large capacitors are used to boost the output voltage, while the proposed circuit uses smaller ones and a small reactor not to boost the output voltage but improve the input current waveform. A circuit design method is shown and confirmed simulation. It explained that compared conventional SPWM inverter with HPWM(Half Pulse-width modulated)Inverter. Proposed HPWM inverter eliminated dead-time by lowering switching loss and holding over-shooting. Output voltage and current of this paper were applied for real air-conditioner.

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HVDC 송전을 위한 전원용 컨버터 시스템의 역률 및 파형개선에 관한 연구 (A Study on Improvement of Powerfactor and Source Waveform Converter System of Power Supply for HVDC Transmission)

  • 황락훈;이춘상;이상용;나승권;조문택
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1999년도 추계학술대회 논문집 학회본부 A
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    • pp.395-397
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    • 1999
  • This paper presents a method of improving the power factor and the waveform of A.C line currents and the out waveforms of AC to DC fully bridge converter systems which is achieved by connecting converters in series and parallel. The results of simulation show that the power factor and the source voltage and current waveforms are improved by the method of connecting converter in series, and the controlled input voltage and current waveform using a current limit controller.

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디지털 제어를 이용한 알루미늄 아크 용접기의 기술현황 (Technology on Arc Welding Machine of Aluminum by Digital Control)

  • 이창제;김유찬;김종도
    • Journal of Welding and Joining
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    • 제31권1호
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    • pp.26-32
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    • 2013
  • Recently, welding technology of nonferrous metals which were difficult to implement by arc welder has become available through digitalization of arc welding machine. Among them, the welding quality improvement of aluminum welding is very noticeable. These results increase the arc stability by controlling arc current and voltage waveform precisely, and control wire feed speed by synchronizing with arc current which the feed rate of filler wire is controlled by a precise motor control of servomotor and not by a simple constant speed feeding. Not only through the hardware digitalization of arc welding machine but also through advance of software of arc welding, it became possible to implement a certain level of welding quality by a simple operation. These led to CMT welding process implementation which requires low heat input than current arc welding and highly increased the applicability of the aluminum welding.

포항가속기연구소 디지탈 전자석 전원장치의 LC 출력필터 (LC output filter for high accuracy and stability digital controlled MPS at PLS)

  • 김성철;하기만;황정연;최진혁
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2005년도 전력전자학술대회 논문집
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    • pp.106-108
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    • 2005
  • High accuracy and stability digital controlled power supply for magnet is developed at PLS. This power supply has three sections. The first section is digital controller including DSP&FPGA and precision ADC, the second section consists of IGBT driver and four quad IGBT switch, and the third section is LC output filter section. AC input voltage of power supply is 3-phase 21V, output current is 0 ${\sim}$ 150 A dc. Switching frequency of four quad IGBT switch is 25 kHz. The output current of power supply has very high accuracy of 100 A step resolution at full range and the stability of +/- 1.5 ppm for short term and +/- 5 ppm for long term. This paper describes characteristics of filter and output current performance improvement after LC output filter at four quad digital power supplies.

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밸리 필 회로 및 부스팅 인덕터를 이용한 LED 구동회로의 역률 개선 (Power factor improvement of LED driver using Valley-fill circuit and a Boosting Inductor)

  • 박종연;이학범;유진완
    • 산업기술연구
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    • 제31권A호
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    • pp.103-107
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    • 2011
  • In this paper, a method is proposed to improve power factor and the input current THD in LED driver circuit. The researched circuit consists of a valley-fill circuit and boosting inductor and a Buck converter. Valley-fill circuit is a passive PFC and simplified structure, the buck converter is operated with current feedback. The switching frequency is 50KHz in LED driver circuit and LED forward current is constant. A valley-fill type PFC circuit for LED driver(15Watt) has been implemented, and the validity of proposed method is shown by is simulation and experimental result.

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승압형 컨버터를 활용한 비접촉식 전력변환 시스템 (contactless power conversion system using the Boost converter)

  • 이승준
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2003년도 추계학술대회 논문집
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    • pp.214-217
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    • 2003
  • The connectorless power supply system on that multi-contact causes confidence when the wiring reconstructed in the rear. As you see above, contact points between sets and indoor space cause inferior function of audio frequency so it needs to be eliminated. This paper explains the structure of connectorless power supply to supply the system with power crossing the air gap in the part of inductively in the connectorless power supply of both magnetic and electrical model. To get maximum output of electrical load, compensating capacitor compensates to show inter-inductance, lequeage-inductance reducing the track-inductance and access the conditions for resonance. At that time it accesses the maximum electric power. The small change of the value of compensating capacitor causes the changes of maximum electric power. Here the power electronics technology is used not only in the industrial machinery but also in the home appliances so the switching power supply is used to actualize the miniaturization, lightweight, and high efficiency. Generally the condenser input methods are widely used in the rectification circuit of switching power supply, but condenser input method generate great quantity of high frequency components because with this method the current flows in the power input filtering condenser only around value of peak of ac input voltage. To solve these problems, installation of power factor improve circuit on the front of filtering capacitence was considered. Several methods were suggested regarding, but the active filter method which makes smalliging and highly power factor possible are the produce main stream. IC for power factor improvement can be utilized by CMOS process proposing low power consumption. When the high power factor is considered seriously in the power factor improvement circuit, active filter method is selected. In the active filter method, the boost converter is used. Regarding this ·the boost converter is needed.

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무정전 전원장치 효율 향상에 대한 연구 (Efficiency Improvement of Uninterruptible Power Supply Systems)

  • 오홍일;권종원;박용만;오드게럴;김희식
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2006년도 심포지엄 논문집 정보 및 제어부문
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    • pp.288-290
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    • 2006
  • An efficiency improving method for Uninterruptible Power Supply System(UPS) was developed by using OP-AMP based application circuits such as voltage detection device, current detection device and static switch control device. The efficiency improving algorithm was made by mixing the operating concepts of On-Line type UPS with the operating concepts of Off-Line type UPS. The UPS' inverter does not work if the UPS' output load current is not higher than the low load operating current which is about 0-30(%) of the UPS' output load capacity. The low load operating current is adjustable within the half of the UPS' output load capacity. If the UPS' output load current is rising over than the low load operating current, the UPS' inverter starts working and the inverter output power feeds to the loads of UPS. If UPS' input power breaks out while UPS' inverter does not operate because the load current is low, the inverter starts working within 4(ms) with excessive output voltage which is ${\pm}$8(%) of normal UPS' output voltage. Like these. UPS can continuously feeds power to it's load device and reduce power consumptions.

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Direct Single-stage Power Converter with Power Factor Improvement for Switched Mode Power Supply

  • Kalpana, R.;Singh, Bhim;Bhuvaneswari, G.
    • Journal of Electrical Engineering and Technology
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    • 제5권3호
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    • pp.468-476
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    • 2010
  • This paper presents a direct single-stage power converter using single-phase isolated full-bridge converter modules, with inherent power factor correction (PFC) for a 12 kW switched mode power supply (SMPS). The advantages of the proposed converter are its simple control strategy, reduction in number of conversion stage, low input line current harmonics, and improvement in power factor. Analysis of the single-stage converter is carried out in continuous conduction mode of operation. Steady-state analysis of the proposed converter is conducted to obtain converter parameters. A systematic design procedure is also presented for a 12k W converter with a design example. The effect of load variation on SMPS is also studied in order to demonstrate the effectiveness of the proposed converter for the complete range of load conditions. A set of power quality indices on input ac mains for an SMPS fed from a single-stage converter is also presented for easy comparison of their performance.