• Title/Summary/Keyword: Topology Control

Search Result 850, Processing Time 0.028 seconds

New SEPIC-Flyback Converter for Boost type Converter (승압형으로 동작하는 새로운 SEPIC-Flyback 컨버터)

  • Mun S. P.;Kim S. S.;Kang K. S.;Won C. Y.;Kim Y. R.
    • Proceedings of the KIPE Conference
    • /
    • 2004.07a
    • /
    • pp.330-334
    • /
    • 2004
  • A new SEPIC-Flyback converter is proposed. The proposed converter is the integration of SEPIC and Flyback converter. Not only SEPIC output but also Flyback output could be fully regulated by constant frequency PWM control. Merged SEPIC and Flyback topology can share the transformer and power MOSFET. When the switch turns on, one topology operates via capacitive energy transfer. The other topology acts as inductive energy transfer while the switch is off. So, it can increase power density per one cycle. The experimental result is presented and verified.

  • PDF

Ground Beam Structure Based Joint Stiffness Controlling Method for Compliant Mechanisms (컴플라이언트 메커니즘 설계를 위한 바닥 보 구조 기반 조인트 강성 조절법)

  • Jang Gang-Won;Kim Yoon-Young;Kim Myung-Jin
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.30 no.10 s.253
    • /
    • pp.1187-1193
    • /
    • 2006
  • Traditionally, the continuum-based topology optimization methods employing the SIMP technique have been used to design compliant mechanisms. Although they have been successful, the optimized mechanisms by the methods are usually difficult to manufacture because of their geometrical complexities. The objective of this study is to develop a topology optimization method that can produce easy-to-fabricate mechanism structure. The proposed method is a ground beam method where beam connectivity is controlled by the beam joint stiffness. In this approach, beam joint stiffness determines the mechanism configuration. Because b the ground structure beams have uniform thicknesses varying only discretely, the resulting mechanism topologies become easily manufacturable.

A novel ZVS interleaved totem-pole PFC converter with reduced circulating current and diode reverse recovery current (순환전류와 다이오드 역회복 전류가 작은 인터리빙 방식의 새로운 ZVS 토템폴 PFC 컨버터)

  • ;Choe, U-Jin
    • Proceedings of the KIPE Conference
    • /
    • 2018.07a
    • /
    • pp.189-191
    • /
    • 2018
  • This paper introduces a novel ZVS interleaved totem-pole PFC with the reduced circulating current and the reverse recovery current of the diodes. With the help of a simple auxiliary inductor, both ZVS turn-on of the main switches and soft turn-off of the body diodes can be achieved. In the proposed totem-pole PFC topology since the switching losses and the reverse recovery losses can be significantly reduced, the typical Si MOSFETs can be employed. In addition the circulating current is reduced by adjusting the switching frequency. The proposed PFC topology can be a low cost solution to achieve high efficiency in high power PFC applications. The validity and the feasibility of the proposed topology is verified by the experimental results with a 3.3kW interleaved totem-pole PFC converter.

  • PDF

High-Frequency Forward Transformer Linked PWM DC-DC Power Converter with Zero Voltage Switching and Zero Current Switching Bridge Legs

  • Moisseev, Serguei;Hamada, Satoshi;Ishitobi, Manabu;Hiraki, Eiji;Nakaoka, Mutsuo
    • Journal of Power Electronics
    • /
    • v.2 no.4
    • /
    • pp.278-287
    • /
    • 2002
  • A novel zero-voltage and zero-current switching PWM DC-DC converter with lowered conduction losses is presented in this paper. A new double two-switch forward high frequency transformer type soft-switching converter topology is developed to minimize circulating currents occurs during freewheeling period. This converter has advantages as less number of the components, simple control principle under constant operation frequency, free of transformer Imbalance effect. The principle of operation is illustrated with steady-state analysis. Moreover, the effectiveness of the proposed converter topology is verified by implementation of a 500w-100kHz breadboard using IGBTs.

A Single-Phase Current-Source Bidirectional Converter for V2G Applications

  • Han, Hua;Liu, Yonglu;Sun, Yao;Wang, Hui;Su, Mei
    • Journal of Power Electronics
    • /
    • v.14 no.3
    • /
    • pp.458-467
    • /
    • 2014
  • In this paper, a single-phase current-source bidirectional converter topology for V2G applications is proposed. The proposed converter consists of a single-phase current-source rectifier (SCSR) and an auxiliary switching network (ASN). It offers bidirectional power flow between the battery and the grid in the buck or boost mode and expands the output voltage range, so that it can be compatible with different voltage levels. The topology structure and operating principles of the proposed converter are analyzed in detail. An indirect control algorithm is used to realize the charging and discharging of the battery. Finally, the semiconductor losses and system efficiency are analyzed. Simulation and experimental results demonstrate the validity and effectiveness of the proposed topology.

High performance Speed control of Switched Reluctance Motor (스위치드 리럭턴스 모터의 고성능 속도제어에 관한 연구)

  • Song Byeang Seab;Yoon Yong Ho;Choi Woo Suck;Kim Jun Ho;Won Chung-Yuen
    • Proceedings of the KIPE Conference
    • /
    • 2001.07a
    • /
    • pp.30-33
    • /
    • 2001
  • Advantages of switched reluctance motor(SRM) drives make it an attractive candidate for replacing adjustable speed ac and do drives in both industrial and consumer applications. Furthermore, a simple, low cost and robust SRM drive can be efficiently operatied ill the hostile environment of an automobile. In this paper, novel topology for fast response of various load is proposed. Proposed topology adapts anti-windup PI controller at increasing speed referense and activate braking mode at decreasing speed and forward load, Experiental results show that proposed topology have fast response charecteristics at increasing and decreasing speed reference.

  • PDF

Designs of the Unified Information Model-IEC61850/IEC61970 and Topology Model for Smart Grid (스마트 그리드 망을 위한 IEC61970/IEC61850 통합 정보 모델과 토폴로지 모델 설계)

  • Yun, Seok-Yeul;Yim, Hwa-Young
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.61 no.1
    • /
    • pp.28-33
    • /
    • 2012
  • The smart grid, which is an integrated type of the power system and the digital network, requires the integration of a CIM(Common Information Model) standard for information modelling at the power control centers and an IEC 61850 standard for automation at the substation level in order to efficiently exchange the information between system elements. This paper describes the method of data transfer from one standard information model to the other standard unified information model by mapping between the objects of IEC 61850 and IEC61970 CIM standards both in the static and dynamic models, and designs the method of data transfer and information exchange between the topology processing application using unified topology class packages.

Topology Optimization Through Material Cloud Method (재료조각법을 이용한 위상최적설계)

  • Chang Su-Young;Youn Sung-Kie
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.29 no.1 s.232
    • /
    • pp.22-29
    • /
    • 2005
  • A material cloud method, which is a new topology optimization method, is presented. In MCM, an optimal structure can be found out by manipulating sizes and positions of material clouds, which are lumps of material with specified properties. A numerical analysis for a specific distribution of material clouds is carried out using fixed background finite element mesh. Optimal material distribution can be element-wisely extracted from material clouds' distribution. In MCM, an expansion-reduction procedure of design domain for finding out better optimal solution can be naturally realized. Also the convergence of material distribution is faster and well-defined material distribution with fewer intermediate densities can be obtained. In addition, the control of minimum-member sizes in the material distribution can be realized to some extent. In this paper, basic concept of MCM is introduced, and formulation and optimization results of MCM are compared with those of the traditional density distribution method(DDM).

Load and Capacitor Stacking Topologies for DC-DC Step Down Conversion

  • Mace, Jules;Noh, Gwangyol;Jeon, Yongjin;Ha, Jung-Ik
    • Journal of Power Electronics
    • /
    • v.19 no.6
    • /
    • pp.1449-1457
    • /
    • 2019
  • This paper presents two voltage domain stacking topologies for powering integrated digital loads such as multiprocessors or 3D integrated circuits. Pairs of loads and capacitors are connected in series to form a stack of voltage domains. The voltage is balanced by switching the position of the capacitors in one case and the position of the loads in the other case. This method makes the voltage regulation robust to large differential load power consumption. The first configuration can be named the load stacking topology. The second configuration can be named the capacitor stacking topology. This paper aims at proposing and comparing these two topologies. Models of both topologies and a switching scheme are presented. The behavior, control scheme, losses and overall performance are analyzed and compared theoretically in simulation and experiments. Experimental results show that the capacitor stacking topology has better performance with a 30% voltage ripple reduction.

A Study on Bipolar DC-DC Converter for Low Voltage Direct Current Distribution (저압 직류 배전용 양극성 DC-DC 컨버터에 관한 연구)

  • Lee, Jung-Yong;Kim, Ho-Sung;Cho, Jin-Tae;Kim, Ju-Yong;Cho, Younghoon
    • The Transactions of the Korean Institute of Power Electronics
    • /
    • v.24 no.4
    • /
    • pp.229-236
    • /
    • 2019
  • This study proposes a DC-DC converter topology of solid-state transformer for low-voltage DC distribution. The proposed topology consists of a voltage balancer and bipolar DC-DC converter. The voltage and current equations are obtained on the basis of switching states to design the controller. The open-loop gain of the controller is achieved using the derived voltage and current equations. The controller gain is selected through the frequency analysis of the loop gain. The inductance and capacitance are calculated considering the voltage and current ripples. The prototype is fabricated in accordance with the designed system parameters. The proposed topology and designed controller are verified through simulation and experiment.