• 전력전자학회:학술대회논문집
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• 전력전자학회 2001년도 Proceedings ICPE 01 2001 International Conference on Power Electronics
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• pp.69-74
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• 2001

In this Paper are described the indirect induction heated boiler and induction heated hot air producer using the voltage-fed series resonant high-frequency inverter which can operate in the frequency range from 20kHz to 50kHz. A specially designed induction heater, which is composed of laminated stainless assembly with many tiny holes and interconnected spot welding points between stainless plates, is inserted into the ceramic type vessel with external working coil. This working coil is connected to the inverter and turbulence fluid through this induction heater to moving fluid generates in the vessel. The operating performances of this unique appliance in next generation and its effectiveness are evaluated and discussed from a practical point of view.

• 전기학회논문지
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• 제60권5호
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• pp.971-976
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• 2011

This paper proposes a test system for a valve and poles building blocks used for large scale inverters such as STATCOM, SSSC, UPFC and VSC HVDC. Power semiconductors in the valve are normally connected in series to withstand switching voltage much larger than the voltage rating of a single power semiconductor. Therefore, there is a need to verify if the dynamic voltage sharing during switching in a valve is satisfactory. In this paper, we propose a test system that provides the necessary test condition: voltage and current in the valve using resonant circuits. A test scheme for a single phase inverter consisting two poles is also proposed. The performance of the inverter pole has to be verified at the factory test, before the system is installed at the site to secure the reliability of the system. The proposed scheme makes it possible to confirm if the pole can withstand voltage and current switching condition and handle loss.

• Journal of information and communication convergence engineering
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• 제6권3호
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• pp.301-304
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• 2008

This paper presents a lossless inductor snubber-assisted series resonant high frequency inverter using the trench gate IGBTs for the electromagnetic induction eddy current-heated fixing roller in copy and printing machines in a new generation. This soft switching high-frequency inverter can completely achieve zero current soft switching (ZCS) commutation mode transitions and wide power regulation under its constant frequency pulse density modulation (PDM) scheme. Its transient and steady state operating principle is originally presented for a constant frequency PDM strategy under a ZCS operation, together with its output power regulation characteristics-based on the pulse density modulation. The effectiveness of this soft switching high-frequency inverter is confirmed for the fixing equipment with the induction-heated fixing roller.

• 전력전자학회논문지
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• 제9권4호
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• pp.326-333
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• 2004

본 논문에서는 Power-MOSFET를 통해 L및 C로 링크된 2조의 공진형 Full-bridge 인버터 회로를 다중 결합하여 대용량 전력변환장치의 소자에 인가되는 전압이나 부하전류를 분산 제어하는 기법을 제안하고 있다. 이 방식은 두 조의 인버터가 시분할로 구동되기 때문에 각 인버터의 독립된 출력이 부하단에서 합성되어 전력이 공급된다. 출력제어 기법은 시분할 합성법을 사용하고 이에 따른 인버터의 회로동작 모드를 분석하고 해석하였으며, 시뮬레이션을 통한 이론적 해석결과를 검정하고 이를 실험을 통해 비교 고찰하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2006년도 전력전자학술대회 논문집
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• pp.235-238
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• 2006

As the screen size of LCD TV increases, an external electrode fluorescent lamp (EEFL) has been suggested to be applicable as backlight source for LCD TV. Since the EEFL has non-linear characteristics, which makes the analysis and design complicated. In this paper, the characteristics of the EEFL are investigated and a full-bridge RLC series-resonant inverter is analyzed and designed for EEFL backlight of 32-inch LCD TV. Finally, the experimental results are shown to validate the analysis and design.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 F
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• pp.2151-2155
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• 1998

The traveling wave type ultrasonic motor(USM) has no electro-magnetic circuits( coil or core). The driving principle of the USM is based on high-frequency mechanical vibrations and frictional force. The USM, thus, is fed by two-phase high - frequency sinusoidal inverter using its series resonant parasitic components. For the using of series resonant type inverter, it should be needed to a USM parasitic capacitance and a proper inductor chosen. In this paper, the values of optimal inductance are designed and the efficiency of USM drives is achieved. The effectiveness of the proposed design is demonstrated by experiments.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 B
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• pp.1224-1226
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• 2000

In this paper, load paralleled type FB series resonant inverter of a new novel type is proposed. In the output control method, phase-shift driving signal control method with CVCF introduces. Also by driving signal patterns, the operation principle of the proposed circuit in detail is described and its characteristics are compared on separated ratio(n). According to each the mode in order to the analysis and characteristic evaluation of the circuit state equations are derived and presented using normalized parameter. To verify the theoretical analysis result, experimental results are provided.

• Journal of Electrical Engineering and information Science
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• 제1권1호
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• pp.51-57
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• 1996

An improved predictive current control technique for a zero current switched(ZCS) buck-boost series resonant inverter(SRI) is proposed to overcome the inherent disadvantages such as the uncontrollable large overshoot and the large current ripple. Using the proposed technique, four quadrant operations of the output voltage and current for an uninterrutible power supply(URS) application are guaranteed and the buck-boost operation can also be obtained without an additional bidirectional switch.

• 한국산학기술학회논문지
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• 제17권4호
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• pp.474-479
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• 2016

친환경에너지에 대한 요구가 높아지면서 전기에너지의 사용은 계속 증가하고 있다. 최근 친환경, 에너지 절약을 위해서 유도가열을 이용한 여러 가지 가열방식에 대한 관심이 높아지고 있다. 본 논문에서는 전자유도현상을 이용한 유도가 열방식을 이용하여 보다 친환경적이고 에너지 절약이 가능한 전기온풍기를 설게 제작하였다. 온풍기는 송풍부, 유도가열부 및 전력변환부 등 3부분으로 구성하였다. 유도가열부는 송풍부에 결합되어 송풍부로부터 발생된 바람이 가열되어 분출되며, 전력변환부는 고주파를 인가하여 자속을 발생시킴으로써 유도가열부의 내부를 가열시킨다. 발열방식은 유도가열의 원리를 적용하고, 전력변환효율성을 높이기 위해 공진형 인버터를 사용하였다. 공진형 인버터는 풀브리지 전압형 직렬부하 공진형 인버터를 사용하였다. 유도가열부는 세라믹 계열의 절연체와 SUS40계열의 금속체를 사용했으며, 전력변환부는 정류부, 필터부 및 공진형 인버터부 등으로 구성 하였다. 본 연구에서 제안한 전기온풍기는 기존의 전기히터와 가스히터 등과 비교한 결과, 온도 상승속도가 빠르고, 사용에너지 비용이 절감되는 등 경제성도 있음을 보였다. 개발된 전기온풍기는 가정용, 상업용 및 농업용 등 여러 분야에 친환경 에너지절감형 온풍기로의 적용 가능성이 있다.

• 대한전기학회논문지
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• 제45권4호
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• pp.517-525
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• 1996

A Simple AC complex circuit analysis for LCL type series resonant converter with phase shift control is proposed. Based on these analyses, a set of characteristic curves which allows a optimal design procedure for this converter is shown, without increasing the volt-ampere rating of tank circuit Especially, inverter output peak current can be minimized in both full load and partial load conditions. The presented design considerations can make the load range wide from full loads to light loads achieving turn-on with zero voltage switching (ZVS) operation. The detailed analysis and experimental results show the effectiveness of the proposed design algorithms. (author). refs., figs., tab.