• Title, Summary, Keyword: DC/DC 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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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.

The Topology of Soft Switching Boost Type DC-DC Converter using a Passive Auxiliary Resonant Snubber (패시브 보조 공진 스너버를 이용한 소프트 스위칭 승압형 DC-DC 컨버터의 토폴로지)

  • Sung, Chi-Ho;Park, Han-Seok
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.64 no.3
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    • pp.146-152
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    • 2015
  • In this paper, we propose a boost DC-DC converter using a modification of the passive auxiliary resonant snubber circuit with a DC-DC converter in a typical active auxiliary resonant snubber-bridge inverter. The proposed boost DC-DC converter is small compared to the DC-DC converter according to the soft-switching scheme that requires a general auxiliary switch by realizing the soft switching operation as a DC-DC converter which does not require an auxiliary switch. It is light-weight, switch the turn-on and turn-off switching loss at the time of the superposition of the voltage and current is extremely small, so small. And the reduction of the surge voltage and current of the switch. In addition, the proposed boost DC-DC converter has a high efficiency over a wide load characteristics change area than conventional hard switching PWM boost converter using an RC snubber loss.

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.

Single Input Multi Output DC/DC Converter: An Approach to Voltage Balancing in Multilevel Inverter

  • Banaei, M.R.;Nayeri, B.;Salary, E.
    • Journal of Electrical Engineering and Technology
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    • v.9 no.5
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    • pp.1537-1543
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    • 2014
  • This paper presents a new DC/AC multilevel converter. This configuration uses single DC sources. The proposed converter has two stages. The first stage is a DC/DC converter that can produce several DC-links in the output. The DC/DC converter is one type of boost converter and uses single inductor. The second stage is a multilevel inverter with several capacitor links. In this paper, one single input multi output DC-DC converter is used in order to voltage balancing on multilevel converter. In addition, as compare to traditional multilevel inverter, presented DC/AC multilevel converter has less on-state voltage drop and conduction losses. Finally, in order to verify the theoretical issues, simulation and experimental results are presented.

Loss Calculation of a High Power DC-DC Converter Considering DC Bias Characteristic of Inductor (인덕터의 DC 바이어스 특성을 고려한 대용량 DC-DC 컨버터의 손실계산)

  • Jo, Young-Chang;Choi, Ju-Yeop;Jung, Seung-Ki;Choy, Ick;Song, Seung-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.4
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    • pp.789-795
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    • 2011
  • It is necessary to accurately predict converter losses for optimized design of a high-power DC-DC converter. The losses of switching devices and inductor among the elements of the converter take significantly greater proportion. The current ripple will be determined by the size of the inductance and this inductance value varies depending on the DC amount of inductor current. As the inductance changes according to load current, the change influences not only the inductor loss itself but also the total converter loss. In this paper, for more accurate design of a bi-directional DC-DC converter for 30kW-class energy storage system, more accurate computational model is proposed considering inductance variation according to the load current change. The inductance changes using variable magnetic cores are verified and converter efficiency is tested through simulations and experiments.

Design of Step-down DC-DC Converter using Switched-capacitor for Small-sized Electronics Equipment (소형 전자기기를 위한 스위치드 커패시터 방식의 강압형 DC-DC 변환기 설계)

  • Kwon, Bo-Min;Heo, Yun-Seok;Song, Han-Jung
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.11 no.12
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    • pp.4984-4990
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    • 2010
  • In this paper, a Step-down CMOS DC-DC Converter using low power switched capacitor method is designed in a 0.5 ${\mu}m$ technology for the integration of devices. Conventional DC-DC converter is used inductor that can store energy in a magnetic field but have low efficiency because power consumption is caused by magnetic flux. And there were problems with size, weight and price to integrate chip. In this paper, a proposed Inductorless step-down CMOS DC-DC converter of low power using SC method is designed in a 0.5um technology to solve these problems. Designed DC-DC converter have 96% power efficiency with 200kHz frequency by using cadence simulation.

DC Power Supply Driving Discharge Lamp Using PWM DC-DC Converter of Single- Phase Shift Soft Switching (위상 천이 소프트 스위칭 PWM DC-DC 컨버터를 이용한 방전등 구동용 직류 전원장치)

  • Lee, Hyun-Woo;Jung, Sang-Hwa;Kwon, Soon-Kurl;Suh, Ki-Young
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.19 no.7
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    • pp.100-106
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    • 2005
  • Generally, high frequency switching DC-DC converter that DC power supply for discharge lamp drive to generate ultraviolet rays(UV) is acted by hard switching mode is used. Therefore in this paper, wish to mix first existent first-side status phase shift PWM DC-DC converter and posing secondary-side status phase shift PWM DC-DC converter by high frequency link DC-DC converter that use soft switching circuit technology and develop DC power supply for discharge lamp drive. DC power supply driving Discharge lamp proposed describe validity through simulation and an experiment.

Modeling and Control of a Two-Stage DC-DC-AC Converter for Battery Energy Storage System (배터리 에너지 저장 장치를 위한 2단 DC-DC-AC 컨버터의 모델링 방법)

  • Hyun, Dong-Yub;Jung, Seok-Eon;Hyun, Dong-Seok
    • The Transactions of the Korean Institute of Power Electronics
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    • v.19 no.5
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    • pp.422-430
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    • 2014
  • This study proposes a small-signal model and control design for a two-stage DC-DC-AC converter to investigate its dynamic characteristics in relation to battery energy storage system. When the circuit analysis of the two-stage DC-DC-AC converter is attempted simultaneously, the mathematical procedure of deriving the dynamic equation is complex and difficult. The main idea of modeling the two-stage DC-DC-AC converter states that this topology is separated into a bidirectional DC-DC converter and a single-phase inverter with an equivalent current source corresponding to that of the inverter or converter. The dynamic equations for the separated converter and inverter are then derived using the state-space averaging technique. The procedures of building the small-signal model of the two-stage DC-DC-AC converter are described in detail. Based on the derived small-signal model, the individual controllers are designed through a frequency-domain analysis. The simulation and experimental results verify the validity of the proposed modeling approach and controller design.

A CMOS Interface Circuit for Vibrational Energy Harvesting (진동에너지 수확을 위한 CMOS 인터페이스 회로)

  • Yang, Min-jae;Yoon, Eun-jung;Yu, Chong-gun
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.267-270
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    • 2014
  • This paper presents a CMOS interface circuit for vibration energy harvesting. The proposed circuit consists of an AC-DC converter and a DC-DC boost converter. The AC-DC converter rectifies the AC signals from vibration devices(PZT), and the DC-DC boost converter generates a boosted and regulated output at a predefined level. A full-wave rectifier using active diodes is used as the AC-DC converter for high efficiency, and a schottky diode type DC-DC boost converter is used for a simple control circuitry. A MPPT(Maximum Power Point Tracking) control is also employed to harvest the maximum power from the PZT. The proposed circuit has been designed in a 0.35um CMOS process. The chip area is $530um{\times}325um$. Simulation results shows that the maximum efficiencies of the AC-DC converter and DC-DC boost converter are 97.7% and 89.2%, respectively. The maximum efficiency of the entire system is 87.2%.

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