• Title/Summary/Keyword: High-switching frequency

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A Miniturization and Stability of DC-to-DC Converters (DC - DC콘버어터의 소형화와 안정성)

  • Kim, Hee-Jun
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.37 no.8
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    • pp.528-533
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    • 1988
  • The miniturization of a DC-to-DC converter in connection with the stability is investigated in this paper. As both the capacitance of the smoothing capacitor and the inductance of the reactor are reduced by rasing the switching frequency, it is known that the stability of the buck converter declines with the switching frequency but the buck-boost converter has a nearly uniform stability. Furthermore, that the buck-boost converter is suitable for the miniturization of circuit is cleared in the high frequency region above a certain switching frequency.

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Comparison and Analysis of the Soft-Switching ZVT Converters in Efficiency Using PSPICE (PSPICE를 이용한 소프트 스위칭 ZVT컨버터 효율 비교와 분석)

  • Kim Yoon-Ho;Kim Su-Hong;Lee Kang-Hee;Kim Seung-Mo
    • Proceedings of the KIPE Conference
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    • 2002.07a
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    • pp.364-369
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    • 2002
  • Presently, a high frequency switching technique is used for a converter design to reduce its size and weight. However an increased switching frequency introduces a high switching loss. To the reduce switching loss, soft switching techniques using ZVS and ZCS are applied. It is very important to improve efficiency. However In general to develop new converter circuits, the efficiency and other performance parameters can be determined after design, implementation and experiments. The idea in this paper is to determine and predict efficiency and other operating characteristics without realization and experiments. Thereby a complex design and implementation can be avoided. PSPICE is used as a simulation tool. This is verified by comparing simulation and experiments results of the two different soft switching converters.

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A Gate Drive Circuit for Low Switching Losses and Snubber Energy Recovery

  • Shimizu, Toshihisa;Wada, Keiji
    • Journal of Power Electronics
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    • v.9 no.2
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    • pp.259-266
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    • 2009
  • In order to increase the power density of power converters, reduction of the switching losses at high-frequency switching conditions is one of the most important issues. This paper presents a new gate drive circuit that enables the reduction of switching losses in both the Power MOSFET and the IGBT. A distinctive feature of this method is that both the turn-on loss and the turn-off loss are decreased simultaneously without using a conventional ZVS circuit, such as the quasi-resonant adjunctive circuit. Experimental results of the switching loss of both the Power MOSFET and the IGBT are shown. In addition, an energy recovery circuit suitable for use in IGBTs that can be realized by modifying the proposed gate drive circuit is also proposed. The effectiveness of both the proposed circuits was confirmed experimentally by the buck-chopper circuit.

Digital Control of Low-Frequency Square-Wave Two-Stage Electronic Ballast for HID Lamps with Resonant Ignition and High Efficiency (공진 점등 기능과 효율 향상을 위한 HID 램프의 저주파수 구형파 2단 전자식 안정기)

  • Lee, Woo-Cheol
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.27 no.2
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    • pp.69-76
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    • 2013
  • In this paper, electronic ballast using resonant inverter for HID lamp is designed and implemented. The proposed electronic ballast is used the soft switching technology ZVS(Zero Voltage Switching) to reduce turn-on and turn-off loss. The ignition of proposed electronic ballast is achieved by controlling a full bridge inverter which is consisted of LC filter for resonance. After ignition the ballast operates as a low frequency square wave inverter by controlling a full bridge inverter as a buck converter. After ignition at resonant frequency of $f_o$=160kHz, the switching frequency of a buck converter is consisted of 50kHz of high frequency and 170Hz of low frequency. This is for attenuating high frequency harmonics and avoiding acoustic resonance. The experimental results show that electronic ballast using resonant inverter is operated stably.

Experimental Validation of a Cascaded Single Phase H-Bridge Inverter with a Simplified Switching Algorithm

  • Mylsamy, Kaliamoorthy;Vairamani, Rajasekaran;Irudayaraj, Gerald Christopher Raj;Lawrence, Hubert Tony Raj
    • Journal of Power Electronics
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    • v.14 no.3
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    • pp.507-518
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    • 2014
  • This paper presents a new cascaded asymmetrical single phase multilevel converter with a lower number of power semiconductor switches and isolated DC sources. Therefore, the number of power electronic devices, converter losses, size, and cost are reduced. The proposed multilevel converter topology consists of two H-bridges connected in cascaded configuration. One H-bridge operates at a high frequency (high frequency inverter) and is capable of developing a two level output while the other H-bridge operates at the fundamental frequency (low frequency inverter) and is capable of developing a multilevel output. The addition of each power electronic switch to the low frequency inverter increases the number of levels by four. This paper also introduces a hybrid switching algorithm which uses very simple arithmetic and logical operations. The simplified hybrid switching algorithm is generalized for any number of levels. The proposed simplified switching algorithm is developed using a TMS320F2812 DSP board. The operation and performance of the proposed multilevel converter are verified by simulations using MATLAB/SIMULINK and experimental results.

High Efficiency DC-DC Converter Using IGBT-MOSFET Parallel Swit (IGBT-MOSFET 병렬 스위치를 이용한 고효율 직류-직류 변환기)

  • 장동렬;서영민;홍순찬;윤덕용;황용하
    • Proceedings of the KIPE Conference
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    • 1998.07a
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    • pp.460-465
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    • 1998
  • Due to high power ratings and low conduction loss, the IGBT has become more attractive in switching power supplies. However, its turn-on and turn-off characteristics cause severe switching loss and switching frequency limitation. This paper proposes 2.4kW, 48V, high efficiency half-bridge DC-DC converter using paralleled IGBT-MOSFET switch concept, where each of IGBT and MOSFET plays its part during on-periods and switching instants. The switching loss is analyzed by using the linearized model and the opteration of the converter are investigated by simulation results.

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Optimal Design of Notch Filter in Photovoltaic Inverter (태양광 인버터의 노치 필터 최적 설계)

  • Kim, Yong-Rae;Heo, Cheol-Young;Lee, Young-Kwoun;Choy, Ick;Choi, Ju-Yeop
    • Journal of the Korean Solar Energy Society
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    • v.39 no.2
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    • pp.81-92
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    • 2019
  • When Photovoltaic inverter is connected to grid and used as PVPCS (Photovoltaic Power Conditioning System), 120 Hz AC ripple occurs at the dc-link capacitor voltage. This AC ripple reduces the efficiency of PVPCS and shortens the lifetime of the capacitor. In this paper, we design a notch filter to remove AC ripple. As a result, the AC voltage ripple was removed from the dc link and the THD of the PVPCS output current with the notch filter was lowered. This notch filter is determined by the damping coefficient, the bandwidth coefficient, and the switching frequency. Among these, the switching frequency determines the switching loss and the size of the LC filter, and the PVPCS with the high switching frequency has a greater efficiency loss due to the switching loss than the efficiency improvement by the notch filter. Therefore, it is important to set the optimum switching frequency in the PVPCS with the notch filter applied. In this paper, THD and switching loss of PVPCS output current with notch filter are calculated through simulation, and cost function to calculate optimum switching frequency through data is proposed.

Back Ground and Expectation for Matrix Converter (PWM Cyclo-Converter) as New Drive System in Next Generation

  • Koga Takashi;Lee Hyun-Woo
    • Proceedings of the KIPE Conference
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    • 2003.07a
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    • pp.216-222
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    • 2003
  • Today we have excellent motor drive system using high frequency carrier PWM control voltage source inverter in the other hand, we have met serious problems caused by high frequency switching. PWM Cyclo-converter called Matrix converter is expected as the new strategy Possible to improve these problems and add some more convenient features suitable for new drive system. in this Paper, we will introduce the background, features and outline of this converter, and additionally introduce some remarkable activity on this converter

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Repetitive Controller for High Power UPS System with Low Switching Frequency (낮은 스위칭 주파수를 갖는 대용량 무정전 전원장치를 위한 반복제어기)

  • Lee, Taeyeong;Cho, Younghoon;KIM, JISU;BYEON, YONGSEOP
    • Proceedings of the KIPE Conference
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    • 2016.07a
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    • pp.477-478
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    • 2016
  • This paper introduces a repetitive controller in low switching frequency applications. Generally, A high power UPS system has a high rated current. And the system usually consist of high power IGBT has a tail current. So the high power UPS system operates in low switching frequency because of this tail current. The repetitive controller improve THD of output voltage or current by reducing the steady state error. The effect of the repetitive controller is proved by simulations.

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