• Title/Summary/Keyword: current source converter

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Commutation Performance of Current Source Converters fed Switched Reluctance Motors (스위치드 리럭턴스 전동기 구동 전류형 컨버터의 전류특성)

  • Jang, Do-Hyun;Choe, ㅍ;Kim, Ki-Su;Jeong, Seon-Ung
    • The Transactions of the Korean Institute of Power Electronics
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    • v.1 no.1
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    • pp.38-46
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    • 1996
  • The commutation operation of the current source converter for switched reluctance motor drives is analyzed in this paper. The commutation operation in the current source converter consists of two modes. At turn-off of phase switch, the phase current decreases sinusoidally, and the sum of two phase currents during commutation period is constant. At this time, the capacitor voltage increases quickly with changing polarity and decreases slowly when another phase switches turn on or off. Frequency of step-down DC chopper in the current source converter is low because of the dump such as BJTs and GTOs are possible as phase switches instead of Power MOSFET and IGBTS. They may result in reductions of conduction losses and manufacturing cost in the current source converter comparing to the voltage source converter of SRM.

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Comparison of Efficiency for Voltage Source and Current Source Based Converter in 5MW PMSG Wind Turbine Systems

  • Kang, Tahyun;Suh, Yongsug
    • Proceedings of the KIPE Conference
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    • 2015.07a
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    • pp.357-358
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    • 2015
  • This paper provides a comparison of power converter loss and thermal description for voltage source and current source type 5MW-class medium voltage topologies of wind turbines. Neutral-point clamped three-level converter is adopted for voltage source type topology while two-level converter is employed for current source type topology considering the popularity in the industry. In order to match the required voltage level of 4160V with the same switching device of IGCT as in voltage source converter, two active switches are connected in series for the case of current source converter. The loss analysis is confirmed through PLECS simulations. In addition, the loss factors due to di/dt and dv/dt snubber and ac input filter are presented. The comparison result shows that VSC-based wind turbine system has a higher efficiency than that of CSC under the rated operating conditions.

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New LED Current Balancing Scheme Using C-Fed Z-Source Converter (전류형 Z-Source 컨버터를 이용한 새로운 LED 전류 밸런싱 기법)

  • Hong, Daheon;Cha, Honnyong
    • The Transactions of the Korean Institute of Power Electronics
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    • v.26 no.1
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    • pp.9-15
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    • 2021
  • In multi-string light-emitting diode (LED) driver system, current balancing is crucial because the brightness of LED is directly related to its forward current. This paper presents a novel LED current balancing topology using current-fed Z-source converter. With the proposed structure, currents flowing through two LED strings are automatically balanced owing to the charge-balance condition on capacitors. Operation of the proposed converter is simple and the proposed converter uses only one active switch and one diode. Moreover, low-side gate driving can be used to operate the active switch. To verify the operation of the proposed LED current balancing converter, a prototype is built and tested with different numbers of LEDs.

Characteristics of Output Voltage and Input Current of Quasi Z-Source Converter with a Diode-Capacitor Output Filter (다이오드-커패시터 출력필터를 갖는 Quasi Z-소스 컨버터의 입력 전류와 출력전압 특성)

  • Lim, Young-Cheol;Kim, Se-Jin;Jung, Young-Gook
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.26 no.6
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    • pp.16-28
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    • 2012
  • This paper proposes a quasi Z-source converter(QZSC) with a diode-capacitor output filter to improve the output DC voltage boost ability. The proposed converter has the same quasi Z-source network topology compared with the conventional converter. But the proposed method is adopted a diode-capacitor filter as its output filter, since the conventional method is used an inductor-capacitor as its output filter. Under the condition of the same input-output DC voltage, the proposed method has more lower shoot-through duty ratio than the conventional method. Also, because the proposed converter has same voltage boost factor under lower shoot-through duty ratio compared with the conventional converter, the proposed converter can be operated with the lower capacitor voltage of Z-source network and the lower input current. To confirm the validity of the proposed method, PSIM simulation and a DSP based experiment were performed to acquire the output DC voltage 120[V] under the input DC voltage 80[V]. And the capacitor voltage and inductor current in Z-source network, the output voltage of each converter were compared and discussed.

Current Source ZCS PFM DC-DC Converter for Magnetron Power Supply

  • Kwon, Soon-Kurl
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.23 no.7
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    • pp.20-28
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    • 2009
  • This paper presents the design of zero current switching ZCS pulse frequency modulation type DC-DC converter for magnetron power supply. A magnetron serving as the microwave source in a microwave oven is driven by a switch mode power supply (SMPS). SMPSs have the advantages of improved efficiency, reduced size and weight, regulation and the ability to operate directly from the converter DC bus. The demands of the load system and the design of the power supply required to produce constant power at 4[kV]. A magnetron power supply requires the ability to limit the load current under short circuit conditions. The current source series resonant converter is a circuit configuration which can achieve this. The main features of the proposed converter are an inherent protection against a short circuit at the output, a high voltage gain and zero current switching over a large range of output power. These characteristics make it a viable choice for the implementation of a high voltage magnetron power supply.

Non-Linear Model of Voltage Source Power Converter and Tuning Current controller (전압형 전력 변환기 비선형 모델 및 전류제어기 조정)

  • Park, Sang-Young
    • Proceedings of the KIEE Conference
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    • 1998.11a
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    • pp.144-146
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    • 1998
  • In this study Dead time equivalent resistance of Voltage source power converter is very important in current controller design. And Non-linear Modeling method can be applied in Power converter analysis. Using Describing Function method and Non-linear Resistance Modeling. Voltage Source Power Converter Bode diagram and Current controller analysis method are more reality.

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Current Control of a Single-phase PWM Converter under the Distorted Source Voltage and Frequency Condition (전원 전압 왜곡과 주파수 변동 시 단상 PWM 컨버터의 전류 제어)

  • Ahn, Chang-Heon;Kim, Sang-Hoon
    • The Transactions of the Korean Institute of Power Electronics
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    • v.20 no.4
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    • pp.356-362
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    • 2015
  • This paper presents a current control strategy in the synchronous reference frame for a single-phase PWM converter, which ensures sinusoidal input current control under the distorted source voltage and frequency condition. Given that the distorted source voltage distorts the phase angle for PWM converter control, the input current contains the same harmonics as the source voltage. Aside from the distorted voltage, the variation in source frequency reduces the performance of input current control. To achieve sinusoidal input current control under the distorted source voltage and frequency condition, this paper proposes a compensation strategy of current reference with the distortion component extracted from the phase angle and a detection strategy of frequency variation from the output of a synchronous reference frame phase-lock loop. The experimental results confirm the validity of the proposed method under the distorted source voltage and frequency condition.

Comparison of Efficiency for Voltage Source and Current Source Based Converters in 5MW PMSG Wind Turbine Systems (전압형 및 전류형 컨버터를 적용한 5MW PMSG 풍력발전시스템의 효율 비교)

  • Kang, Tahyun;Kang, Taewon;Chae, Beomseok;Lee, Kihyun;Suh, Yongsug
    • The Transactions of the Korean Institute of Power Electronics
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    • v.20 no.5
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    • pp.410-420
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    • 2015
  • This paper provides a comparison of power converter loss and thermal description for voltage source and current source type 5 MW-class medium-voltage topologies of wind turbines. Neutral-point clamped three-level converter is adopted for a voltage source type topology, whereas a two-level converter is employed for current source type topology, considering the popularity in the industry. To match the required voltage level of 4160 V with the same switching device of IGCT as in the voltage source converter, two active switches are connected in series for the case of current source converter. Transient thermal modeling of a four-layer Foster network for heat transfer is done to better estimate the transient junction and case temperature of power semiconductors during various operating conditions in wind turbines. The loss analysis is confirmed through PLECS simulations. Comparison result shows that the VSC-based wind turbine system has higher efficiency than the CSC under the rated operating conditions.

Delay Time Reliability of Analog and Digital Delay Elements for Time-to-Digital Converter

  • Choi, Jin-Ho
    • Journal of information and communication convergence engineering
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    • v.8 no.1
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    • pp.103-106
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    • 2010
  • In this paper, the delay times were evaluated to develop highly reliable time-to-digital converter(TDC) in analog and digital delay element structures. The delay element can be designed by using current source or inverter. In case of using inverter, the number of inverter has to be controlled to adjust the delay time. And in case of using current source, the current for charging and discharging is controlled. When the current source is used the delay time of the delay element is not sensitive with varying the channel width of CMOS. However, when the inverter is used the delay time is directly related to the channel width of CMOS. Therefore to obtain good reliability in TDC circuit the delay element using current source is more stable compared to inverter in the viewpoint of the variation of fabrication process.

4-Channel LED Current Balancing Scheme Using C-Fed Hybrid Quasi-Z-Source Converter (전류형 하이브리드 Quasi-Z-Source 컨버터를 이용한 4-채널 LED 전류 밸런싱 기법)

  • Hong, Daheon;Cha, Honnyong
    • The Transactions of the Korean Institute of Power Electronics
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    • v.26 no.1
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    • pp.66-73
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    • 2021
  • This study presents a novel four-channel light-emitting diode (LED) current balancing topology using a current-fed hybrid quasi-Z-source converter. With the proposed structure, currents flowing through four LED strings are automatically balanced owing to the charge (amp-sec) balance condition on capacitors. Thus, automatic current balancing of the proposed driver is simple and precise. In addition, the proposed LED driver uses only one active switch and three diodes. The operating principle and characteristics of the proposed four-channel LED driver are analyzed in detail. To verify the operation of the proposed LED driver, a prototype is built and tested with different numbers of LEDs.