• Title/Summary/Keyword: Isolated dc-dc converter

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Analysis and Design of DC-DC Converter with Independent Dual Outputs (독립적인 이중 출력을 갖는 DC-DC 컨버터의 해석 및 설계)

  • Heo, Tae-Won;Park, Ji-Ho;Kim, Dong-Wan;Woo, Jung-In
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.54 no.4
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    • pp.171-178
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    • 2005
  • The proposed dual-output DC-DC converter that bases on flyback converter can obtain two output voltage with non-isolated main-output and isolated sub-output at the same time using single-winding high frequency transformer. It can solve problems in multi-winding converter that use one main-switch, and also control quality of isolated sub-output voltage can be improved by additional sub-switch to the second. For analysis and design of the proposed converter system, converters are classified as operation mode from switching state and are become modeling by applying state space averaging method. Steady-state characteristics and dynamic characteristics are analyzed by DC component and perturbation component from state space averaging model. From experiment converter, validity of analysis and design for the propose converter system is confirm.

Dynamic Analysis and Control Circuit Design of Isolated Double Step-Down DC-DC Converter (절연형 이중 강압 직류-직류 컨버터의 동특성 해석 및 제어회로 설계)

  • Ha, Heonchul;Kim, Hansang;Choi, Byungcho
    • Proceedings of the KIPE Conference
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    • 2015.07a
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    • pp.229-230
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    • 2015
  • This paper presents practical details about control-loop design and dynamic analysis for a voltage-mode controlled isolated double step-down DC-DC converter. Graphical loop gain method is used to design the feedback compensation and analyze the closed-loop performance of isolated double step-down DC-DC converter. The results of the control design and closed-loop analysis are validated by experiments on a prototype converter.

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The Secondary LLC Series Resonant Converter for the Boost DC/DC Converter (변압기 2차측 LLC 직렬공진컨버터 적용 승압형 DC/DC 컨버터)

  • Lee Hyun-Kwan;Cha In-Su;Lee Gi-Sik;Chung Bong-Geun;Kang Sung-In;Kim Eun-Soo
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.55 no.8
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    • pp.423-429
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    • 2006
  • Recently, the high frequency isolated boost DC/DC converter has been widely used for the PCS (Power Conditioning System) system because of its small size and low cost. However, the high frequency isolated boost DC/DC converters applied the conventional voltage-fed converter and current-fed converter have the problems such as the high conduction losses and the surge voltage due to the high circulating current and the leakage inductance, respectively. To overcome this problems, in this paper the secondary LLC resonant converter is proposed, and the experimental results of the secondary LLC series resonant converter for boost DC/DC converter are verified on the simulation based on the theoretical analysis and the 700W experimental prototype.

Design and Development of 30W Military Grade DC-DC Converter for Guided Weapon and Aircraft (유도무기 및 항공기 탑재장비용 30W급 군사용 DC-DC 변환장치 개발)

  • Park, Sang-Min;Joo, Dong-Myoung;Chae, Soo-Yong;Kim, Hyung-Jung;Lee, Byoung-Kuk
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.66 no.9
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    • pp.1341-1350
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    • 2017
  • In this paper, a high reliability 30W DC-DC converter is designed considering military standard (MIL-STD) for military applications such as guided weapon and aircraft. The performances and specifications of conventional military grade DC-DC converter are practically analyzed. The requirements for military grade DC-DC converter are established in consideration of MIL-STD and analysis results of conventional product. Two isolated DC-DC converter, forward and fly-back converter, are designed and compared to determine topology. From experimental results under various operating conditions, the forward topology satisfied performances and specifications of MIL-STD for military DC-DC converter.

A Study on High Efficiency OBC with Wide Range Output Using Isolated Current-Fed PFC Converter (절연형 전류원 PFC 컨버터를 사용한 넓은 출력범위를 가지는 고효율 OBC에 대한 연구)

  • Kim, Hyung-Sik;Kim, Hee-Jun;Ahn, Joon-Seon
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.12 no.1
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    • pp.99-105
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    • 2019
  • OBC for battery charging of electric vehicles mainly consist of two stages including PFC circuit and isolated DC-DC converter circuit. In general, a non-isolated boost converter is used as the PFC circuit, and a resonant converter capable of ZVS (zero voltage switching) is used as the isolated DC-DC converter. In this paper, we propose an OBC composed of isolated current-fed type PFC circuit and buck DC-DC converter. The proposed OBC is easy to configure the circuit and controller, and can cope with a wide output range. In order to verify the validity of the proposed circuit, a prototype 3.3 ㎾ class prototype was fabricated. As a result, the maximum efficiency and the maximum power factor of 99.2% were confirmed under the operational stability and rated load conditions at the output voltage of 150V ~ 400V.

Two-Switch Non-Isolated Step-Up DC-DC Converter

  • Nguyen, Minh-Khai;Choi, Youn-Ok;Cho, Geum-Bae;Lim, Young-Cheol
    • Journal of Power Electronics
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    • v.18 no.3
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    • pp.651-661
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    • 2018
  • This paper suggests a new non-isolated high voltage gain DC-DC converter with two switches. The proposed two-switch converter has the following characteristics: a high voltage gain, a continuous input current with a small ripple, a reduction in the size of the inductor, and a simple circuit with only a few elements. A theoretical analysis, guidelines for parameter selection, and a comparison with conventional non-isolated high step-up converters are presented. A prototype of 250 W is set up to demonstrate the correctness of the proposed converter. Results obtained from simulations and experiments are presented.

Single-Ended High-Efficiency Step-up Converter Using the Isolated Switched-Capacitor Cell

  • Kim, Do-Hyun;Jang, Jong-Ho;Park, Joung-Hu;Kim, Jung-Won
    • Journal of Power Electronics
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    • v.13 no.5
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    • pp.766-778
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    • 2013
  • The depletion of natural resources and renewable energy sources, such as photovoltaic (PV) energy, has been highlighted for global energy solution. The PV power control unit in the PV power-generation technology requires a high step-up DC-DC converter. The conventional step-up DC-DC converter has low efficiency and limited step-up ratio. To overcome these problems, a novel high step-up DC-DC converter using an isolated switched capacitor cell is proposed. The step-up converter uses the proposed transformer and employs the switched-capacitor cell to enable integration with the boost inductor. The output of the boost converter and isolated switched-capacitor cell are connected in series to obtain high step-up with low turn-on ratio. A hardware prototype with 30 V to 40 V input voltage and 340 V output voltage is implemented to verify the performance of the proposed converter. As an extended version, another novel high step-up isolated switched-capacitor single-ended DC-DC converter integrated with a tapped-inductor (TI) boost converter is proposed. The TI boost converter and isolated-switched-capacitor outputs are connected in series to achieve high step-up. All magnetic components are integrated in a single magnetic core to lower costs. A prototype hardware with 20 V to 40 V input voltage, 340 V output voltage, and 100 W output power is implemented to verify the performance of the proposed converter.

Design and Implementation of a Power Conversion Module for Solid State Transformers using SiC MOSFET Devices (배전용 반도체 변압기 구현을 위한 SiC MOSFET 기반 전력변환회로 단위모듈 설계에 관한 연구)

  • Lim, Jeong-Woo;Cho, Young-Hoon
    • The Transactions of the Korean Institute of Power Electronics
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    • v.22 no.2
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    • pp.109-117
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    • 2017
  • This paper describes the design and implementation of a unit module for a 10 kVA class 13.2 kV/220 V unidirectional solid-state transformer (SST) with silicon-carbide metal-oxide-semiconductor field-effect transistors. The proposed module consists of an active-front-end (AFE) converter to interface 1320 V AC voltage source to 2500 V DC link and an isolated resonant DC-DC converter for 500 V low-voltage DC output. The design approaches of the AFE and the isolated resonant DC-DC converters are addressed. The control structures of the converters are described as well. The experiments for the converters are performed, and results verify that the proposed unit module can be successfully adopted for the entire SST operation.

Reduction of DC-Link Capacitance in Single-Phase Non-Isolated Onboard Battery Chargers

  • Nguyen, Hoang Vu;Lee, Sangmin;Lee, Dong-Choon
    • Journal of Power Electronics
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    • v.19 no.2
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    • pp.394-402
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    • 2019
  • This paper proposes a single-phase non-isolated onboard battery charger (OBC) for electric vehicles (EVs) that only uses small film capacitors at the DC-link of the AC-DC converter. In the proposed charger, an isolated DC-DC converter for low-voltage batteries is used as an active power decoupling (APD) circuit to absorb the ripple power when a high-voltage (HV) battery is charged. As a result, the DC-link capacitance in the AC-DC converter of the HV charging circuit can be significantly reduced without requiring any additional devices. In addition, some of the components of the proposed circuit are shared in common for the different operating modes among the AC-DC converter, LV charging circuit and active power filter. Therefore, the cost and volume of the onboard battery charger can be reduced. The effectiveness of the proposed topology has been verified by the simulation and experimental results.

A New High Efficient Bi-directional DC/DC Converter in the Dual Voltage System

  • Lee Su-Won;Lee Seong-Ryong;Jeon Chil-Hwan
    • Journal of Electrical Engineering and Technology
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    • v.1 no.3
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    • pp.343-350
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    • 2006
  • This paper introduces a new high efficient bi-directional, non-isolated DC/DC converter. Through variations of the topology of the conventional Cuk converter, an optimum bi-directional DC/DC converter is proposed. Voltage and current in the proposed DC/DC converter are continuous. Furthermore, the efficiency in both step-up and step-down mode is improved over that of the conventional bi-directional converter. To prove the validation for the proposed converter, simulations and experiments are executed with a 300W bi-directional converter.