• Proceedings of the KIPE Conference
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• 2007.07a
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• pp.375-377
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• 2007

본 논문에서는 LCD backlight 구동을 위한 Dual charge pump inverter를 제안하였다. 제안 회로는 넓은 입력 및 부하 범위에서 영전압 스위칭(Zero Voltage Switching) 동작을 보장하여 효율이 높은 장점을 가진다. 기존 full bridge 방식의 회로와 비교하여 동등한 수준의 소자 전압 스트레스를 가지며, 트랜스포머 1차측 양단 전압을 Full_Bridge 방식에 비해 2배로 만들 수 있어 트랜스포머의 턴비 감소 효과를 얻을 수 있다. 또한 각 소자 전류 스트레스를 기존 대비 1/2로 줄일 수 있는 장점을 가진다. 위와 같이 제안한 회로의 타당성 검증을 위해 시뮬레이션과 40인치 LCD Pannel에 적용하여 실험을 수행하였다.

• Proceedings of the KIPE Conference
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• 2015.07a
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• pp.201-202
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• 2015

기존 Plasma Burner용 인버터 구동회로의 경우, Full Bridge Inverter를 사용하기 때문에 소자수가 많고 스위칭 손실이 큰 문제점이 있다. 본 논문은 Plasma Burner 구동을 위한 무손실 단일 스위치 인버터를 제안한다. 기존 Full Bridge Inverter를 사용하는 Plasma Burner 구동회로의 경우에는 4개의 스위치를 사용하기 때문에 스위치 손실이 매우 크고, Heat-sink 크기가 커지는 단점이 있다. 반면 제안된 Plasma Burner 구동을 위한 무손실 단일 스위치 인버터는 1개의 스위치를 사용하고, 스너버의 전력 손실이 최소화되기 때문에 전력 손실이 매우 작고 Heat-sink 최소화 및 고효율화가 가능한 장점을 갖는다. 본 논문에서는 제안된 Plasma Burner 구동을 위한 무손실 단일 스위치 인버터의 이론적인 특성을 분석하고 모의실험을 통해 확인하였으며, 15W급 Plasma Bunrer에 적용하여 실험을 통해 우수성을 검증하였다.

• Proceedings of the KIPE Conference
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• 2005.07a
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• pp.774-777
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• 2005

In this paper, a constant frequency phase shifting PWM controlled voltage source full bridge-type series load resonant high-frequency inverter using the IGBT power modules is presented for innovative consumer electromagnetic induction heating applications such as a hot water producer, steamer and super heated steamer. The full bridge arm side link passive quasi-resonant capacitor snubbers in parallel with the each power semiconductor device and high frequency AC load side linked active edge inductive snubber-assisted series load resonant tank soft switching inverter with a constant frequency phase shifted PWM control scheme is discussed and evaluated on the basis of the simulation and experimental results. It is proved from a practical point of view that the series load resonant and edge resonant hybrid high-frequency soft switching PWM inverter topology, what is called class DE type. including the variable-power variable-frequency(VPVF) regulation function can expand zero voltage soft switching commutation range even under low output power setting ranges, which is more suitable and acceptable for induction heated dual packs fluid heater developed newly for consumer power utilizations. Furthermore, even in the lower output power regulation mode of this high-frequency load resonant tank high frequency inverter circuit it is verified that this inverter can achieve ZVS with the aid of the single auxiliary inductor snubber.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.51 no.11
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• pp.645-651
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• 2002

In this paper, a multilevel PWM inverter employing a cascaded transformer is presented to reduce the harmonics of output voltage and load currents. The proposed PWM inverter consists of two full-bridge modules and their corresponding transformers. The secondarics of each transformer are series-connected. So continuous output voltage levels can be synthesized from the suitable selection of the turns ratio of trasformer. And it appears an integral ratio to input DC source. Because of the cascaded connection of transformers, output filter inductor is not necessary. The operational principles and analysis are explained, and it is compared with a conventional isolated H-bridge PWM inverter. The validity of proposed multilevel inverter is verified through simulated and experimental waveform and their FFT results.

• 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.

• Proceedings of the KIPE Conference
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• 2006.06a
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• pp.488-491
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• 2006

In this paper proposed method of maximum power point tracking using boost converter for a connected single phase inverter with photovoltaic system. The maximum power point tracking control is based on generated circuit control MOSFET switch of boost converter and single phase inverter uses predicted current control to control four IGBT's switch in full bridge. The predicted current control provide current with sinusoidal wave shape and inphase with voltage. The generation control circuit allows each photovoltaic module to operate independently at peak capacity, simply by detecting of the output power of the system. Furthermore, the generation control circuit attenuates low-frequency ripple voltage, which is caused by the full-bridge inverter, across the photovoltaic modules. Consequently, the output power of system is increased due to the increase in average power generated by the photovoltaic modules. The effectiveness of the proposed inverter system is confirmed experimentally and by means of simulation.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.20 no.7
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• pp.74-80
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• 2006

This paper describes a solar energy conversion strategy is applied to grid-connected single phase inverter by the maximum power point of conversion strategy. The maximum power point of tracking is controlled output power of PV(photovoltaic)modules, based on generated circuit control MOSFET switch of two boost converter for a connected single phase inverter with four IGBT's switch in full bridge. The generation control circuit allows each photovoltaic module to operate independently at peak capacity, simply by detecting of the output power of PV module. Furthermore, the generation control circuit attenuates low-frequency ripple voltage. which is caused by the full-bridge inverter, across the photovoltaic modules. The effectiveness of the proposed inverter system is confirmed experimentally and by means of simulation.

• Proceedings of the IEEK Conference
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• 2003.07b
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• pp.1023-1026
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• 2003

An electronic ballast for driving automotive HID lamps is presented. The circuit topology is composed of a fly back converter, a Ful bridge inverter, and an igniter. A prototype was developed and tested on a 35W lamp with a 12V input voltage. To avoiding the acoustic resonance, the full bridge inverter is operated at 250Hz and provided a squared-wave voltage source to the lamp. The transient and steady state characteristics of the tested HID lamps are measured and analyzed.

• The Transactions of the Korean Institute of Power Electronics
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• v.27 no.3
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• pp.256-264
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• 2022

The frequency power control method (FCM) which has a wide operating frequency range is adopted for induction heating (IH) cooktops. When FCM is applied to the full-bridge series resonant converter (FB-SRC) based IH system, high-frequency switching of the inverter is required compared to the half-bridge SRC (HB-SRC)-based IH system. Therefore, the switching loss of the inverter increases, and applying FCM under the condition that the inverter operating frequency range is limited is difficult. Therefore, this paper proposes a control strategy with the phase shift power control method considering that limited frequency conditions are presented. Loss analysis following the control method is performed through simulation and mathematical analysis. In addition, the validity of the proposed control strategy is verified by analyzing the heating performance following the control method through the test results of the 3,200[W] prototype.

• Proceedings of the KIPE Conference
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• 2003.07b
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• pp.621-624
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• 2003

In this paper, a novel multilevel inverter using DC-Link voltage combination is presented to reduce the harmonics of output voltage without the output filter inductor. The proposed multilevel inverter can generate 27-level output voltage. It employs three H-bridge cells which consist of single phase full-bridge inverter module. As well as, it can make continuous output voltage level employing the properly three DC-Link voltage ratio. The validity of the proposed inverter is verified through the experimental result using a prototype which can generate a 110[Vac], 60[Hz] output voltage from 12[Vdc], 36[vdc], and 108[Vdc] input voltages