• Title/Summary/Keyword: DC voltage ripple

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Current Ripple Reduction Method of 3-phase Interleaved Bidirectional DC-DC Converter with the Consideration of Input and Output Voltage Variation (입·출력 전압 변동을 고려한 3상 인터리브드 양방향 DC-DC컨버터의 전류리플 저감 기법)

  • Sun, Daun;Jung, Jae-Hun;Nho, Eui-Cheol;Joung, Gyu-Bum
    • The Transactions of the Korean Institute of Power Electronics
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    • v.21 no.5
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    • pp.427-433
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    • 2016
  • This paper proposes a new method for the current ripple reduction of a three-phase interleaved bidirectional DC-DC converter. Usually, the three-phase interleaved bidirectional DC-DC converter is used for battery charging and discharging to reduce battery current ripple. In V2G application, a PWM AC-DC converter is used to connect the AC power grid and three-phase interleaved bidirectional DC-DC converter for battery charging and discharging. The magnitude of DC link voltage affects the battery current ripple magnitude. Therefore, the magnitude of the battery ripple current is analyzed with variations of battery and DC link voltages. The ripple current magnitude is found to be minimized by controlling the DC link voltage. Simulation and experimental results show the usefulness of the proposed method.

Performance Improvement of B4 Inverters by Adding Compensation Voltage (보상전압 첨가를 통한 B4 인버터 성능향상)

  • Lee, Dong-Myung
    • The Transactions of the Korean Institute of Power Electronics
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    • v.18 no.1
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    • pp.110-116
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    • 2013
  • This paper proposes a current ripple reduction method to improve the control performance of B4 type inverter that is studied for cost-effective drive systems. B4 inverters employ only four switches and they have a center-tapped connection between the split dc-link capacitors and one phase of a three-phase motor or load. In the B4 topology, unbalanced three-phase voltages will be generated due to the dc-link voltage ripple. To solve this problem, this paper presents a voltage distortion compensation method that adjusts the voltage reference with the consideration of dc-link voltage ripple. The validity of the proposed method is verified by simulation and excremental results with an induction machine.

Compensation of Effects of DC-Link Ripple Voltages on Output Voltage of Two-Leg Three-Phase PWM Inverters (2-레그 3상 PWM 인버터의 출력전압에서 직류링크 리플전압의 영향 보상)

  • Kim Young-Sin;Lee Dong-Choon;Seok Jul-Ki
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.55 no.1
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    • pp.47-53
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    • 2006
  • In this paper, a simple scheme compensating for the effect of dc-link ripple voltages on output voltage of two-leg and three-phase PWM inverters is proposed, where single-phase half-bridge PWM convertor and two-leg inverter are used. The voltage at neutral point of the dc-link is controlled so that the upper-half of do-link voltage is equal to the lower-half voltage in average concept. However, the effect of the do-link ripple voltage results in the inverter output voltage and current distortion. This effect can be eliminated by introducing a compensation voltage in switching time calculation. Also, the inverter dead time should be compensated for sinusoidal output waveform. The proposed scheme has been verified by experimental results which were obtained from the V/F constant operation of the induction motor fed by two-leg inverter.

DC link voltage control method in the sinusoidal current drive system for dental hand-piece PMSM (치과 핸드피스용 고속 PMSM의 정현파 구동을 위한 인버터 직류 링크전압 제어기법)

  • Jeon, Geum-Sang;Park, Jae-Seung;Park, Sang-Uk;Kim, Sang-Hee;Ahn, Hee-Wook
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.12 no.4
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    • pp.16-21
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    • 2013
  • This paper presents a DC link voltage control method to reduce the ripple current and the switching loss in the sinusoidal current drive system for the wide-speed range PMSM. The DC link voltage of the three phase inverter in the sinusoidal current drive system is designed by the back-EMF voltage at maximum speed of the PMSM. In general, the drive systems have used the constant DC link voltage without reference to the motor speed. The current ripple causes hysteresis loss and makes noise. In addition, the switching loss on the inverter increases in proportion to the rise in the DC link voltage. In this paper, we propose the variable DC link voltage control method to reduce the current ripple in the PMSM drive system. We show reduction effect of the current repple and the switching loss through simulation results.

LCCT Z-Source DC-DC Converter with the Bipolar Output Voltages for Improving the Voltage Stress and Ripple (전압 스트레스와 맥동이 개선된 양극성 출력 전압을 갖는 LCCT Z-소스 DC-DC 컨버터)

  • Park, Jong-Ki;Shin, Yeon-Soo;Jung, Young-Gook;Lim, Young-Cheol
    • The Transactions of the Korean Institute of Power Electronics
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    • v.18 no.1
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    • pp.91-102
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    • 2013
  • This paper proposes the improved LCCT(Inductor-Capacitor-Capacitor-Trans) Z-source DC-DC converter (Improved LCCT ZSDC) which can generate the bipolar output voltages according to duty ratio D. The proposed converter has the characteristic and structure of Quasi Z-source DC-DC converter(Quasi ZSDC) and conventional LCCT Z-source DC-DC converter(LCCT ZSDC). To confirm the validity of the proposed method, PSIM simulation and a DSP based experiment were performed for each converter. In case which the input DC voltage is 70V, the bipolar output DC voltage of positive 90V and negative 50V could generate. Also, as comparison result of the capacitor voltage ripple in Z-network and the input current under the same condition for each converter, the voltage stress and the capacitor voltage in Z-network of the proposed method were lower compared with the conventional methods. Finally, the efficiency for each method was investigated according to load variation and duty ratio D.

Design of a DC-DC Converter for CMOS Image Sensors in Bio-sensor Chips (바이오센서용 CMOS 이미지 센서를 위한 DC-DC Converter 설계)

  • Park, Heon;Ha, Pan-Bong;Kim, Young-Hee
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.9 no.6
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    • pp.553-558
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    • 2016
  • A DC-DC converter for CMOS image sensors in bio-sensor chips is proposed. The DC-DC converter generates a PCP voltage, that is an on voltage of a pixel, and an NCP voltage, that is an off voltage of a pixel. The PCP voltage with a ripple voltage of within 1.33V is obtained from a positive charge pump of VPP (=5V) with a ripple voltage of 45.35 by using a regulator. Also, the NCP voltage with a ripple voltage of 0.05mV is obtained from a negative charge pump of VNN (=-2V) with a ripple voltage of 62.8 by using a regulator.

Two Modified Z-Source Inverter Topologies - Solutions to Start-Up Dc-Link Voltage Overshoot and Source Current Ripple

  • Bharatkumar, Dave Heema;Singh, Dheerendra;Bansal, Hari Om
    • Journal of Power Electronics
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    • v.19 no.6
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    • pp.1351-1365
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    • 2019
  • This paper proposes two modified Z-source inverter topologies, namely an embedded L-Z-source inverter (EL-ZSI) and a coupled inductor L-Z source inverter (CL-ZSI). The proposed topologies offer a high voltage gain with a reduced passive component count and reduction in source current ripple when compared to conventional ZSI topologies. Additionally, they prevent overshoot in the dc-link voltage by suppressing heavy inrush currents. This feature reduces the transition time to reach the peak value of the dc-link voltage, and reduces the risk of component failure and overrating due to the inrush current. EL-ZSI and CL-ZSI possess all of the inherent advantages of the conventional L-ZSI topology while eliminating its drawbacks. To verify the effectiveness of the proposed topologies, MATLAB/Simulink models and scaled down laboratory prototypes were constructed. Experiments were performed at a low shoot through duty ratio of 0.1 and a modulation index as high as 0.9 to obtain a peak dc-link voltage of 53 V. This paper demonstrates the superiority of the proposed topologies over conventional ZSI topologies through a detailed comparative analysis. Moreover, experimental results verify that the proposed topologies would be advantageous for renewable energy source applications since they provide voltage gain enhancement, inrush current, dc-link voltage overshoot suppression and a reduction of the peak to peak source current ripple.

Reactive Power Control of Single-Phase Reactive Power Compensator for Distribution Line (배전선로용 단상 무효전력 보상기의 무효전력제어)

  • Sim, Woosik;Jo, Jongmin;Kim, Youngroc;Cha, Hanju
    • The Transactions of the Korean Institute of Power Electronics
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    • v.25 no.2
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    • pp.73-78
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    • 2020
  • In this study, a novel reactive power control scheme is proposed to supply stable reactive power to the distribution line by compensating a ripple voltage of DC link. In a single-phase system, a magnitude of second harmonic is inevitably generated in the DC link voltage, and this phenomenon is further increased when the capacity of DC link capacitor decreases. Reactive power control was performed by controlling the d-axis current in the virtual synchronous reference frame, and the voltage control for maintaining the DC link voltage was implemented through the q-axis current control. The proposed method for compensating the ripple voltage was classified into three parts, which consist of the extraction unit of DC link voltage, high pass filter (HPF), and time delay unit. HPF removes an offset component of DC link voltage extracted from integral, and a time delay unit compensates the phase leading effect due to the HPF. The compensated DC voltage is used as feedback component of voltage control loop to supply stable reactive power. The performance of the proposed algorithm was verified through simulation and experiments. At DC link capacitance of 375 uF, the magnitude of ripple voltage decreased to 8 Vpp from 74 Vpp in the voltage control loop, and the total harmonic distortion of the current was improved.

The Finite Element Methodology of Switched Reluctance Motor Considering DC Link Voltage Ripple and Freewheeling Diodes (DC Link 전압리플과 환류 다이오드를 고려한 스위치드 릴럭턴스 전동기의 유한요소해석 기법)

  • Choi Jae-Hak;Kim Tae Heoung;Jang Ki-Bong;Lee Sang-Don;Lee Ju
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.54 no.1
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    • pp.1-8
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    • 2005
  • This paper presents a characteristic analysis of switched reluctance motor (SRM) considering switching control method and DC link voltage ripple by using time-stepped voltage source finite element method in which the magnetic field is combined with drive circuit. We also examine the influence of freewheeling diodes and DC link voltage ripple on the performance of the SRM such as torque ripples and radial force on the surface of the teeth. The freewheeling diodes and DC link voltage ripples must be taken into account to predict the performance of SRM.

The Characteristic Analysis of Switched Reluctance Motor Considering DC Link Voltage Ripple and Freewheeling diodes (DC link 전압리플과 환류 다이오드를 고려한 스위치드 릴럭턴스 전동기의 특성 해석)

  • Lee Seung-Jun;Choi Jae-Hak;Lim Seong-Yeop;Lee Ju
    • Proceedings of the KIEE Conference
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    • summer
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    • pp.872-874
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    • 2004
  • This paper presents a charcteristcic analysis switched reluctance motor (SRM) considering hard chopping and DC link voltage ripple by using time-stepped voltage source finite element method in which the magnetic field is combined with drive circuit. We also examine the influence of freewheeling diodes and DC link voltage ripple on the performance of the SRM such as torque ripples and radial force on the surface of the teeth The freewheeling diodes and DC link voltage ripples must be taken into account in predicted the performance of SRM

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