• Title/Summary/Keyword: Input Current Improvement

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

  • Kim, Namyong
    • Journal of Internet Computing and Services
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    • v.18 no.6
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    • pp.1-6
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    • 2017
  • For the algorithm of cross-information potential with delta functions (CIPD) which has superior performance in impulsive noise environments, a new method of employing the information of power variations of magnitude controlled input (MCI) in the weight update equation of the CIPD is proposed in this paper where the input of CIPD is modified by the Gaussian kernel of error. To prove its effectiveness compared to the conventionalCIPD algorithm, the distance between the current weight vector and its previous one is analyzed and compared under impulsive noise. In the simulation results the proposed method shows a two-fold improvement in steady state stability, faster convergence speed by 1.8 times, and 2 dB - lower minimum MSE in the impulsive noise situation.

A Study of the Partial Circulating Current Type Cycloconverter with a Resonant Circuit for Induction Heating (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))

  • Kim, Hyun-Jung;Cho, Kyu-Min;Kim, Young-Seok
    • Proceedings of the KIEE Conference
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    • 1992.07b
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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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Improvement in Power Factor of Partial Switching Converter for air-conditioner (에어컨용 부분공진 스위칭 컨버터의 역률개선)

  • Suh, K.Y.;Lee, H.W.;Ko, T.E.;Kim, Y.M.;Mun, S.P.;Jang, W.S.
    • Proceedings of the KIEE Conference
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    • 1999.07f
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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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A Study on Improvement of Powerfactor and Source Waveform Converter System of Power Supply for HVDC Transmission (HVDC 송전을 위한 전원용 컨버터 시스템의 역률 및 파형개선에 관한 연구)

  • Hwang, Lak-Hoon;Lee, Chun-Sang;Lee, Sang-Yong;Na, Seng-Kwon;Cho, Moon-Taek
    • Proceedings of the KIEE Conference
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    • 1999.11b
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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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Technology on Arc Welding Machine of Aluminum by Digital Control (디지털 제어를 이용한 알루미늄 아크 용접기의 기술현황)

  • Lee, Chang-Je;Kim, Yu-Chan;Kim, Jong-Do
    • Journal of Welding and Joining
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    • v.31 no.1
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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.

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

  • Kim, S.C.;Ha, K.M.;Huang, J.Y.;Choi, J.H.
    • Proceedings of the KIPE Conference
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    • 2005.07a
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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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Power factor improvement of LED driver using Valley-fill circuit and a Boosting Inductor (밸리 필 회로 및 부스팅 인덕터를 이용한 LED 구동회로의 역률 개선)

  • Park, Chong-Yeun;Lee, Hak-Beom;Yoo, Jin-Wan
    • Journal of Industrial Technology
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    • v.31 no.A
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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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contactless power conversion system using the Boost converter (승압형 컨버터를 활용한 비접촉식 전력변환 시스템)

  • Lee S. J.
    • Proceedings of the KIPE Conference
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    • 2003.11a
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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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Efficiency Improvement of Uninterruptible Power Supply Systems (무정전 전원장치 효율 향상에 대한 연구)

  • Oh, Heun-Gil;Kwon, Jong-Won;Park, Yong-Man;Odgerel, Odgerel;Kim, Hie-Sik
    • Proceedings of the KIEE Conference
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    • 2006.04a
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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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    • v.5 no.3
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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.