• Title/Summary/Keyword: PWM DC-DC converter

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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.

Radiation Effects on PWM Controller of DC/DC Power Buck Converter (DC/DC 전력 강압 컨버터의 PWM 제어기 방사선 영향)

  • Lho, Young-Hwan
    • Journal of the Korean Society for Railway
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    • v.15 no.2
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    • pp.116-121
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    • 2012
  • DC/DC switching power converters produce DC output voltages from different DC input sources. The converter is used in regenerative braking of DC motors to return energy back in the supply, resulting in energy savings for the systems containing frequent stops. The DC/DC converter is composed of a PWM-IC (pulse width modulation integrated circuit) controller, a MOSFET (metal-oxide semi-conductor field-effect transistor), an inductor, capacitors, and resistors, etc. PWM is applied to control and regulate the total output voltage. In this paper, radiation shows the main influence on the changes in the electrical characteristics of comparator, operational amplifier, etc. in PWM-IC. In the PWM-IC operation, the missing pulses, the changes in pulse width, and the changes of the output waveform are studied by the simulation program with integrated circuit emphasis (SPICE) and compared with experiments.

Implementation of DC/DC Power Buck Converter Controlled by Stable PWM (안정된 PWM 제어 DC/DC 전력 강압 컨버터 구현)

  • Lho, Young-Hwan
    • Journal of Institute of Control, Robotics and Systems
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    • v.18 no.4
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    • pp.371-374
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    • 2012
  • DC/DC switching power converters produce DC output voltages from different stable DC input sources regulated by a bi-polar transistor. The converters can be used in regenerative braking of DC motors to return energy back in the supply, resulting in energy savings for the systems containing frequent stops. The voltage mode DC/DC converter is composed of a PWM (Pulse Width Modulation) controller, a MOSFET (Metal Oxide Semiconductor Field Effect Transistor), an inductor, and capacitors, etc. PWM is applied to control and regulate the total output voltage. It is shown that the output of DC/DC converter depends on the variation of threshold voltage at MOSFET and the variation of pulse width. In the PWM operation, the missing pulses, the changes in pulse width, and a change in the period of the output waveform are studied by SPICE (Simulation Program with Integrated Circuit Emphasis) and experiments.

A Design of Current Mode PWM/PFM DC-DC Boost Converter (전류모드 PWM/PFM DC-DC Boost 변환기 설계)

  • Hwang, In-Ho;Yu, Seong-Mok;Park, Jong-Tae;Yu, Chong-Gun
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2011.10a
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    • pp.404-407
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    • 2011
  • This paper presents a design of current mode PWM/PFM DC-DC Boost converter. This DC-DC Boost Converter operates with PWM mode at the heavy loads and with PFM mode at light loads. The DC-DC boost converter is designed with CMOS 0.35${\mu}m$ technology. It operates at 500KHz and can drive a load current up to 600mA. It has a maximum power efficiency of 92.1%. The total chip area is $1300{\mu}m{\times}1070{\mu}m$ including pads. The DC-DC boost converter operates in a wide range of load currents while occupying a small chip area.

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A Study on the Design of Voltage Mode PWM DC/DC Power Converter (전압모드 PWM DC/DC 전력 컨버터 설계연구)

  • Lho, Young-Hwan
    • Journal of the Korean Society for Railway
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    • v.14 no.5
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    • pp.411-415
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    • 2011
  • DC/DC switching power converters are commonly used to generate a regulated DC output voltages with high efficiencies from different DC input sources. The voltage mode DC/DC converter utilizes MOSFET (metal-oxide semiconductor field effect transistor), inductor, and a PWM (pulse-width modulation) controller with oscillator, amplifier, and comparator, etc. to efficiently transfer energy from the input to the output at periodic intervals. The fundamental boost converter and a buck converter containing a switched-mode power supply are studied. In this paper, the electrical characteristics of DC/DC power converters are simulated by program of SPICE, and the PWM controller is implemented to check the operation. In addition, power efficiency is analyzed based on the specification of each component.

A Novel Three-Level ZVS PWM Inverter Topology for High-Voltage DC/DC Conversion Systems with Balanced Voltage Sharing and Wider Load Range (차단전압 균형과 넓은 부하범위를 갖는 새로운 3-레벨 ZVS PWM DC-DC 컨버터)

  • 송인호;유상봉;서범석;현동석
    • Proceedings of the KIPE Conference
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    • 1996.06a
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    • pp.71-75
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    • 1996
  • As the Three-level ZVS PWM DC-DC converter operates likewise full-bridge ZVS PWM DC-DC converter and the blocking voltage of each switching device is a half of the DC-link voltage, it is suitable for the high imput voltage applications. However, it has some problems as follows; The blocking voltage of each devices is unbalanced and it causes the power losses of the inner switching devices to be increased. Also, it has narrow load range so that the switching losses and the efficiency are reduced as it goes to the light load. This paper presents an nove Three-level ZVS PWM DC-DC converter, which can reduce the overvoltage of the outer switches, eliminate the unbalance of the voltage sharing between the switches at turn-off due to the stray inductances, and operate from no load to full load. The characteristics and the performances of the proposed Three-level ZVS PWM DC-DC converter are verified by simulation and experimental results

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A Study on the Step-up DC-DC Converter for PV System Application Under Variable Input Voltage Condition (가변 입력 전압 조건하에서 태양광 시스템 적용을 위한 승압형 DC-DC 컨버터 연구)

  • Ju-Yeop Lee;Se-Cheon Oh;Il-Hyeong Jo;Ye-Jin Kim;Yun-Seok Ko
    • The Journal of the Korea institute of electronic communication sciences
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    • v.19 no.4
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    • pp.677-684
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    • 2024
  • In this paper, the design method of a step-up DC-DC converter based on PWM control was studied for solar power system application. The operating principle of the switching mode step-up type DC-DC converter was analyzed and the basic design method was studied. For photovoltaic system application, an output voltage feedback control algorithm based on PWM control was developed to enable the converter's output voltage to follow the target voltage under variable input conditions. As a procedure to verify the effectiveness of the proposed algorithm, a prototype of a step-up DC-DC converter with a single feedback output voltage was designed and made by boosting the input voltage DC 10V to DC 30V. In experiments with prototypes, it was confirmed that the output voltage of the oscilloscope and LCD accurately followed the target output voltage. In the performance evaluation test, it was confirmed that the output voltage of the oscilloscope and LCD accurately followed the target output voltage by showing an error rate within 1 [%] of the reference voltage.

A Novel Quasi-Resonant Snubber-Assisted ZCS-PWM DC-DC Converter with High Frequency Link

  • Fathy, Khairy;Kwon, Soon-Kurl
    • Journal of Power Electronics
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    • v.7 no.2
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    • pp.124-131
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    • 2007
  • In this paper, a novel type of auxiliary switched capacitor assisted edge resonant soft switching PWM resonant DC-DC converter with two simple auxiliary commutation lossless inductor snubbers is presented. The operation principle of this converter is described using the switching mode equivalent circuits. This newly developed multi resonant DC-DC converter can regulate its DC output AC power under a principle of constant frequency edge-resonant soft switching commutation by an asymmetrical PWM duty cycle control scheme. The high frequency power regulation and actual power characteristics of the proposed soft switching PWM resonant DC-DC converter are evaluated and discussed. The operating performances of the newly proposed soft switching inverter are represented based on simulation results from an applications point of view.

Optimal Design of a DC-DC Converter for Photovoltaic Generation

  • Kwon, Soon-Kurl
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.25 no.3
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    • pp.40-49
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    • 2011
  • This paper presents novel circuit topology of half-bridge soft-switching PWM inverter type DC-DC high power converter for DC bus feeding power plants. The proposed DC-DC power converter is composed of a typical voltage source-fed, half-bridge high frequency PWM inverter with a high frequency planar transformer link PWM control scheme and parallel capacitive lossless snubbers. The operating principle of the new DC-DC converter treated here is described by using switching mode-equivalent circuits, together with its unique features. All the active power switches in the half-bridge arms and input DC bus lines can achieve ZCS turn-on and ZVS turn-off commutation transitions. The total turn-off switching losses of the power switches can be significantly reduced. As a result, high switching frequency IGBTs can actually be selected in the frequency range of 40[kHz] under the principle of soft-switching. The performance evaluations of the experimental setup are illustrated practically.

PWM CMOS DC-DC Boost Converter with Adaptive Dead-Time Control (Dead-Time 적응제어 기능을 갖는 PWM CMOS DC-DC 부스트 변환기)

  • Hwang, In-Ho;Yoon, Eun-Jung;Park, Jong-Tae;Yu, Chong-Gun
    • Journal of IKEEE
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    • v.16 no.3
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    • pp.203-210
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    • 2012
  • Since the non-overlapping gate driver used in conventional DC-DC boost converters generates fixed dead-times, the converters suffer from the body-diode conduction loss or the charge-sharing loss. To reduce the efficiency degradation due to these losses, this paper presents a PWM DC-DC boost converter with adaptive dead-time control. The proposed DC-DC boost converter delivering 3.3V output from a 2.5V input is designed with CMOS $0.3{\mu}m$ technology. It operates at 500kHz and has a maximum power efficiency of 97.3%.