• Title/Summary/Keyword: Diode-clamped circuit

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FPGA Implementation of Diode Clamped Multilevel Inverter for Speed Control of Induction Motor

  • Kuppuswamy, C.L.;Raghavendiran, T.A.
    • Journal of Electrical Engineering and Technology
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    • v.13 no.1
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    • pp.362-371
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    • 2018
  • This work proposes FPGA implementation of Carrier Disposition PWM for closed loop seven level diode clamped multilevel inverter in speed control of induction motor. VLSI architecture for carrier Disposition have been introduced through which PWM signals are fed to the neutral point seven level diode clamped multilevel using which the speed of the induction motor is controlled. This proposed VLSI architecture makes the power circuit to work better with reduced stresses across the switches and a very low voltage and current total harmonic distortion (THD). The output voltages, currents, torque & speed characteristics for seven level neutral point diode clamped multilevel inverter for AC drive was studied. It has observed the proposed scheme introduces less distortion and harmonics. The results were validated using real time results.

A New Snubber Circuit Combined Undelannd and McMurray Snubber for Diode-Clamped Four-level Inverter and Converter (Diode-Clamped 4-레벨 인버터 및 컨버터를 위한 Undeland 및 McMurray 스너버를 결합한 새로운 스너버 회로)

  • 성현제
    • Proceedings of the KIPE Conference
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    • 2000.07a
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    • pp.224-227
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    • 2000
  • 지금까지 멀티레벨 컨버터 및 인버터에 적용되어온 기존의 스너버는 턴온 스너버로 RLD 스너버 턴오프 스너버로 RCD 스너버를 사용하였으나 이들 RCD/RLD는 많은 소자를 필요로하며 스위칭시의 overvoltage와 스너버 손실이 큰 단점을 지니고 있다. 이와같은 문제점을 해결하기 위해 본 논문에서는 Diode-clamped 4-레벨 컨버터 및 인버터를 위한 새로운 스너버를 제안한다. 새로 제안하는 스너버는 Basic snubber unit로 특성이 좋은 Undeland 스너버와 수정된 RCD/RLD 스너버를 사용한다. 따라서 제안하는 스너버는 Undeland 스너버와 McMuray 스너버가 갖고 있는 특성 즉 사용소자의 수의 감소 과전압의 감소 스너버 손실의 감소 등과 좋은 특성을 지니고 있다 또한 본 논문에서 제안하는 4-레벨 컨버터 및 인버터를 위한 스너버 회로를 구성하는 방법은 다른 레벨의 멀티레벨 컨버터 및 인버터에도 적용가능하다,

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An Optimization Design of the Diode Clamped Multi-Level Converter for Coaxial Inductive Power Transfer on the Low Voltage DC Micro-grid

  • Pairindra, Worapong;Khomfoi, Surin
    • Journal of Electrical Engineering and Technology
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    • v.13 no.1
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    • pp.333-344
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    • 2018
  • This proposed paper aims for the high efficiency contactless power transfer in household dc power distribution. A 300 W five-level diode clamped multi-level converter with 300 Vdc input dc link bus is employed for the power transferring task and the output voltage range is controlled at 48 Vdc. The inner and outer solenoid coils are used for inductive power transfer (IPT) transformer with the 200 kHz switching frequency for designed power density. Therefore, to achieve the converter efficiency above 95%, the LLC series resonant with fundamental harmonic analysis (FHA) and the calculated switching angles are used as an optimized tool for designing the system resonant tank. The validations of this approached topology are illustrated in both MATLAB/Simulink simulation and implementation.

Full ZVS Load Range Diode Clamped Three-level DC-DC Converter with Secondary Modulation

  • Shi, Yong
    • Journal of Power Electronics
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    • v.16 no.1
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    • pp.93-101
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    • 2016
  • A new four-primary-switch diode clamped soft switching three-level DC-DC converter (TLDC) with full zero-voltage switching (ZVS) load range and TL secondary voltage waveform is proposed. The operation principle and characteristics of the presented converter are discussed, and experimental results are consistent with theoretical predictions. The improvements of the proposed converter include a simple and compact primary structure, TL secondary rectified voltage waveform, wide load range ZVS for all primary switches, and full output-regulated range with soft switching operation. The proposed converter also has some disadvantages. The VA rating of the transformer is slightly larger than that of conventional TLDCs in variable input and constant output mode. The conduction loss of the primary coil is slightly higher because an air gap is inserted into the magnetic cores of the transformer. Finally, the secondary circuit is slightly complex.

Multi-Level Inverter Circuit Analysis and Weight Reduction Analysis to Stratospheric Drones (성층권 드론에 적용할 멀티레벨 인버터 회로 분석 및 경량화 분석)

  • Kwang-Bok Hwang;Hee-Mun Park;Hyang-Sig Jun;Jung-Hwan Lee;Jin-Hyun Park
    • Journal of the Korean Society of Industry Convergence
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    • v.26 no.5
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    • pp.953-965
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    • 2023
  • The stratospheric drones are developed to perform missions such as weather observation, communication relay, surveillance, and reconnaissance at 18km to 20km, where climate change is minimal and there is no worry about a collision with aircraft. It uses solar panels for daytime flights and energy stored in batteries for night flights, providing many advantages over existing satellites. The electrical and power systems essential for stratospheric drone flight must ensure reliability, efficiency, and lightness by selecting the optimal circuit topology. Therefore, it is necessary to analyze the circuit topology of various types of multi-level inverters with high redundancy that can ensure the reliability and efficiency of the motor driving power required for stable long-term flight of stratospheric drones. By quantifying the switch element voltage drop and the number and weight of inverter components for each topology, we evaluate efficiency and lightness and propose the most suitable circuit topology for stratospheric drones.

Actively Clamped Two-Switch Flyback Converter with High Efficiency

  • Yang, Min-Kwon;Choi, Woo-Young
    • Journal of Power Electronics
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    • v.15 no.5
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    • pp.1200-1206
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    • 2015
  • This paper proposes an actively clamped two-switch flyback converter. Compared to the conventional two-switch flyback converter, the proposed two-switch flyback converter operates with a wide duty cycle range. By using an active-clamp circuit, the proposed converter achieves zero-voltage switching for all of the power switches. Zero-current switching of an output diode is also achieved. Thus, compared with the conventional converter, the proposed converter realizes a higher efficiency with an extended duty cycle. The performance of the proposed converter is verified by the experimental results with use of a 1.0 kW prototype circuit.

Novel Single Switch DC-DC Converter for High Step-Up Conversion Ratio

  • Hu, Xuefeng;Gao, Benbao;Huang, Yuanyuan;Chen, Hao
    • Journal of Power Electronics
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    • v.18 no.3
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    • pp.662-671
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    • 2018
  • This paper presents a new structure for a step up dc-dc converter, which has several advantageous features. Firstly, the input dc source and the clamped capacitor are connected in series to transfer energy to the load through dual voltage multiplier cells. Therefore, the proposed converter can produce a very high voltage and a high conversion efficiency. Secondly, a double voltage clamped circuit is introduced to the primary side of the coupled inductor. The energy of the leakage inductance of the coupled inductor is recycled and the inrush current problem of the clamped circuits can be shared equally by two synchronous clamped capacitors. Therefore, the voltage spike of the switch tube is solved and the current stress of the diode is reduced. Thirdly, dual voltage multiplier cells can absorb the leakage inductance energy of the secondary side of the coupled inductor to obtain a higher efficiency. Fourthly, the active switch turns on at almost zero current and the reverse-recovery problem of the diodes is alleviated due to the leakage inductance, which further improves the conversion efficiency. The operating principles and a steady-state analysis of the continuous, discontinuous and boundary conduction modes are discussed in detail. Finally, the validity of this topology is confirmed by experimental results.

A Study on the Neutral Point Potential Variation under Open-Circuit Fault of Three-Level NPC Inverter (3레벨 NPC 인버터 개방성 고장 시 중성점 전압변동에 관한 연구)

  • Park, Jong-Je;Park, Byoung-Gun;Ha, Dong-Hyun;Hyun, Dong-Seok
    • The Transactions of the Korean Institute of Power Electronics
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    • v.14 no.4
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    • pp.333-342
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    • 2009
  • Three-level Diode Clamped Multilevel Inverter, generally known as Neutral-Point-Clamped (NPC) Inverter, has an inherent problem causing Neutral Point (NP) potential variation. Until now, in many literatures NP potential problem has been investigated and lots of solutions have also been proposed. However, under fault and fault tolerant control, distinctive feature for NP potential variation problem was rarely published from the standpoint of reliability. In this paper, NP potential is analytically investigated both normal and faulty conditions under carrier based PWM. Subsequently, relation between fault detection time and size of capacitor is analyzed. This information is explored by simulation and experiment results, which contribute to enhance the reliability of inverter system.

Investigations of Multi-Carrier Pulse Width Modulation Schemes for Diode Free Neutral Point Clamped Multilevel Inverters

  • Chokkalingam, Bharatiraja;Bhaskar, Mahajan Sagar;Padmanaban, Sanjeevikumar;Ramachandaramurthy, Vigna K.;Iqbal, Atif
    • Journal of Power Electronics
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    • v.19 no.3
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    • pp.702-713
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    • 2019
  • Multilevel Inverters (MLIs) are widely used in medium voltage applications due to their various advantages. In addition, there are numerous types of MLIs for such applications. However, the diode-less 3-level (3L) T-type Neutral Point Clamped (NPC) MLI is the most advantageous due to its low conduction losses and high potential efficiency. The power circuit of a 3L T-type NPC is derived by the conventional two level inverter by a slight modification. In order to explore the MLI performance for various Pulse Width Modulation (PWM) schemes, this paper examines the operation of a 3L (five level line to line) T-type NPC MLI for various types of Multi-Carriers Pulse Width Modulation (MCPWM) schemes. These PWM schemes are compared in terms of their voltage profile, total harmonic distortion (THD) and conduction losses. In addition, a 3L T-type NPC MLI is also compared with the conventional NPC in terms of number of switches, clamping diodes, main diodes and capacitors. Moreover, the capacitor-balancing problem is also investigated using the Neutral Point Fluctuation (NPF) method with all of the MCPWM schemes. A 1kW 3L T-type NPC MLI is simulated in MATLAB/Simulink and implemented experimentally and its performance is tested with a 1HP induction motor. The results indicate that the 3L T-type NPC MLI has better performance than conventional NPC MLIs.

Zero-Voltage Switching Two-Transformer Full-Bridge PWM Converter With Lossless Diode-Clamp Rectifier (새로운 무 손실 다이오드 클램프 회로를 채택한 두 개의 트랜스포머를 갖는 영 전압 스위칭 풀 브릿지 컨버터)

  • Yoon H. K.;Han S. K.;Park J. S.;Moon G. W.;Youn M. J.
    • Proceedings of the KIPE Conference
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    • 2004.07b
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    • pp.551-555
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    • 2004
  • The two-transformer full bridge (TTFB) PWM converter has two transformers which act as the output inductor as well as the main transformer, i.e. as the forward and the flyback transformer. Although the doubled leakage inductor of the TTFB makes it easier to achieve the zero-voltage switching (ZVS) of the lagging leg switch along the wide load range, it instigates a serious voltage ringing in the secondary rectifier diodes, which would require the dissipative snubber circuit, cause the serious power dissipation, and increase the voltage stress across those diodes. To overcome these problems, a, new lossless diode-clamp rectifier (LDCR) is employed as the output rectifier, which helps the voltage across rectifier diodes to be clamped on a half the output voltage $(V_o/2)$ or the output voltage $(V_o)$. Therefore, no dissipative snubber for rectifier diodes is needed and a high efficiency as well as low noise output voltage can be realized. The operations, analysis and design consideration of proposed converter are presented in this paper. To verify the validity of the proposed converter, experimental results from a 425W, 385-170Vdc prototype for the plasma display panel (PDP) sustaining power module (PSPM) are presented.

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