• Title, Summary, Keyword: Converter

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Investigation and Circuit Analysis for DC-DC Converter (DC-DC Converter 특성검토 및 회로해석)

  • Hwang, Su-Seol;Lee, Jae-Deuk
    • Aerospace Engineering and Technology
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    • v.5 no.2
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    • pp.166-173
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    • 2006
  • A DC-DC converter is a device that accepts a DC input voltage and produces a DC output voltage. Typically the output produced is at a different voltage level than the input. In addition, DC-DC converters are used to provide noise isolation, power bus regulation, etc. In this paper, it reviews some kinds of the popular DC-DC converter topolopgies and performs simulation selected basic type of DC-DC Converter.(Buck-type Converter)

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Design and Development of Low-Cost Switched Reluctance Motor Drive System (저가형 스위치드 릴럭턴스 모터 드라이브 시스템 개발)

  • Ha, Keun-Soo
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.11
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    • pp.2162-2167
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    • 2009
  • A Low cost and variable speed brushless motor drive system with single switch per phase is presented. The motor drive is realized with a novel two-phase flux-reversal-free switched reluctance motor and a split AC two switch converter. The strategy of the controller and the converter for its realization are described. Comparisons between a split AC converter, asymmetric converter, split DC converter, single controllable switch converter, and N+1 converter are performed for its device rating, cost, switching losses and conduction losses, and converter efficiency. The split AC converter is analyzed and simulated to verify the characteristics of the converter circuitry and control feasibility and the simulation results are presented. The efficiency with various loads is numerically estimated and experimentally compared from viewpoint of subsystem and system in details. The focus of this paper is to compare the presented motor drive system to the asymmetric converter system throughout experiments and demonstrate single switch per phase converter having comparable efficiency as the asymmetric converter system.

Soft-Switched Synchronous Buck Converter for Battery Chargers

  • Dong, Zhiyong;Joung, Gyubum
    • International journal of advanced smart convergence
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    • v.8 no.4
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    • pp.138-146
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    • 2019
  • In this paper, we proposed a soft-switched synchronous buck converter, which can perform charging the battery. The proposed converter has low switching loss even at high frequency operation due to its soft switching characteristics. The converter operates in synchronous mode to minimize conduction loss, resulting in small conduction loss, also. In this reason, the efficiency of the converter can be greatly improved even in high frequency. The size and weight of the converter can be reduced by high frequency operation of the converter. In this paper, we designed a battery charger with a switching frequency of 100 kHz. The designed converter also simulated to prove the converter's characteristics of synchronous operation as well as soft switching operation. The simulation shows that the proposed converter always meets the soft switching conditions of turning on and off switching in the zero voltage and zero current states. Therefore, simulation results have confirmed that the proposed battery charger had soft switching characteristics. The simulation results for transient response to charge current for the designed converter show that the converter responds to charge current commands quickly within 0.05 ms.

High Quality DC-DC Boosting Converter Based on Cuk Converter and Advantages of Using It in Multilevel Structures

  • Rostami, Sajad;Abbasi, Vahid;Kerekes, Tamas
    • Journal of Power Electronics
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    • v.19 no.4
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    • pp.894-906
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    • 2019
  • In this paper, a DC-DC converter is proposed based on the Cuk converter. The proposed converter has high efficiency and it can be used in multilevel DC-DC converters. A reduction of the inductors size in comparison to Cuk converter and a reduction in the inductors resistance negative effects on efficiency are the important points of the proposed converter. Its voltage ripple is reduced when compared to other converters. Its output voltage has a high quality and does not contain spikes. A theoretical analysis demonstrates the positive points of the proposed converter. The design and analysis of the converter are done in continues conduction mode (CCM). Experiments confirm the obtained theoretical equations. The proposed converter voltage gain is similar to that of a conventional Boost converter. As a result, they are compared. The comparison illustrates the advantages of the proposed converter and its higher quality. Furthermore, a prototype of the proposed converter and its combination with a 2x multiplier are built in the lab. Experimental results validate the analysis. In addition, they are in good agreements with each other.

Design and control of the SEPIC-Flyback converter for Fuel Cell generator system (연료전지 시스템용 SEPIC-Flyback Converter의 설계 및 제어)

  • Kang, Ku-Sam;Jang, Su-Jin;Lee, Tae-Won;Kim, Soo-Seok;Won, Chung-Yeun
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • pp.467-472
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    • 2005
  • In this paper, design and control of the novel SEPIC-Flyback converter(SF converter) is developed as a possible converter for fuel cell system. This output characteristic of SF converter is similar to Buck-Boost converter in that it can step-up or step-down the voltage. With the small signal equivalent circuit modeling of SF converter, control-to-output transfer function is obtained. SF converter couples up the inductive type converter to capacitive type converter with one transformer, which has less ripple current than its respective one does. To verify the validity of the proposed converter, 500W, 100kHz converter is designed and tested. ZVS switching and active clamping are also tested in practice.

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A Novel Integrated Battery Charger Structure for Multiple Charge and V2G application for Electric Vehicles (전기자동차의 다중충전 및 V2G 응용을 위한 새로운 통합 배터리 충전기구조)

  • Vu, Hai-Nam;Choi, Woojin
    • Proceedings of the KIPE Conference
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    • pp.13-14
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    • 2016
  • This paper has introduces a novel Integrated On-board Charger (IOBC) to reduce the size, weight and cost of power conversion stages in Electric Vehicles (EVs). The IOBC is composed of an OBC and a low voltage dc-dc converter (LDC). The IOBC includes a bidirectional ac-dc converter and a bidirectional full-bridge converter with an active clamp circuit. The LDC converter is a hybrid topology combining an active clamped full-bridge converter and a forward converter derived from the Weinburg converter topology. Unlike conventional OBC, the proposed IOBC is compact and the LDC converter of it can achieve a higher efficiency. In addition, the LDC converter of the proposed IOBC can achieve high step-down voltage conversion ratio, no circulating current, no reverse recovery current of the rectifier diodes and small ripple current of output inductor on the auxiliary battery. A 1kW hardware of the LDC converter is implemented to verify the performances of the proposed IOBC.

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A winding design of Tap Level Converter (Tap Level 제어 전력 변환기의 권선설계)

  • Chun J.H.;Lee H.W.
    • Proceedings of the KIPE Conference
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    • pp.53-55
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    • 2006
  • In this paper discusses winding methode of single phase AC-DC reversible power converter The reversible power converter driven by multi Tap winding at both side switching control. It has a advantage that simple drive of main switching device. and obtain load current of good quality without filter circuit and free from noise or isolation for lower switching frequency. In this research, study on current type converter and inverter circuit that consist for possibility of AC-DC/DC-AC multi-level reversible converter.

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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.

Development of Wireless Power Transceiver with Bi-directional DC-DC Converter (양방향으로 동작하는 DC-DC Converter를 이용하는 무선 전력 송수신기 개발)

  • Moon, Young-Jin;Yoo, Changsik
    • Journal of the Institute of Electronics and Information Engineers
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    • v.51 no.7
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    • pp.111-121
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    • 2014
  • A bi-directional DC-DC converter has been developed for a wireless power transceiver which enables a device to receive and transmit power wireless. Generally, the wireless power transceiver requires two DC-DC covnerter and two external inductors. However, the proposed wireless power transceiver requires only one DC-DC converter and one inductor, allowing small form-factor. The bi-directional DC-DC converter implemented in $0.35{\mu}m$ BCDMOS process operates as a buck converter at the wireless power receiving mode and the power efficiency is 91% when the ouput power is 3W. In the wireless power transmitter mode, the DC-DC converter operates as a boost converter. With the bi-directional DC-DC converter and the proposed efficiency maximizing techniques, the power efficiency of wireless power transceiver is 81.7% in receiver mode and 76.5% in transmitter mode.

Switched Capacitor Based High Gain DC-DC Converter Topology for Multiple Voltage Conversion Ratios with Reduced Output Impedance

  • Priyadarshi, Anurag;Kar, Pratik Kumar;Karanki, Srinivas Bhaskar
    • Journal of Power Electronics
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    • v.19 no.3
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    • pp.676-690
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    • 2019
  • This paper presents a switched capacitor (SC) based bidirectional dc-dc converter topology for high voltage gain applications. The proposed converter is able to operate with multiple integral voltage conversion ratios based on user input. The architecture of a user-friendly, inductor-less multi-voltage-gain bidirectional dc-dc converter is proposed in this study. The inductor-less or magnetic-less design of the proposed converter makes it effective in higher temperature applications. Furthermore, the proposed converter has a reduced component count and lower voltage stress across its switches and capacitors when compared to existing SC converters. An output impedance analysis of the proposed converter is presented and compared with popular existing SC converters. The proposed converter is simulated in the OrCAD PSpice environment and the obtained results are presented. A 200 W hardware prototype of the proposed SC converter has been developed. Experimental results are presented to validate the efficacy of the proposed converter.