• Title/Summary/Keyword: Induction heating

Search Result 576, Processing Time 0.042 seconds

The Application of the Induction Heating Technology for the food dryness (식품건조를 위한 유도가열 기술 응용 연구)

  • Ryu M.H.;Baek J.W.;Kim J.H.;Yoo D.W.;Rim G.H.
    • Proceedings of the KIEE Conference
    • /
    • summer
    • /
    • pp.1148-1150
    • /
    • 2004
  • 본 논문에서는 $400^{\circ}C$ 이상의 과열 증기발생을 위하여 6kW급 유도가열장치를 개발하여 식품건조 시스템에 적용한 예를 보인다. 유도가열장치는 과열 증기의 온도를 제어하기 위하여 인버터 입력 전압을 $100\sim200V$로 가변제어가 가능하게 하였고, 인버터 입력 전압은 벅컨버터를 사용하여 기준 전압을 과열증기의 온도에 대한 전압 값을 사용하여 제어하였으며, LC 공진에 의해 발생한 전류로 증기 가열 챔버를 유도 가열하여 과열 증기를 발생하게 하였다. 발생한 과열 증기는 식품 건조를 위하여 건조로에 투입되어 고온 건조에서 식품의 건조시간을 단축시킬 수 있었으며, 식품의 손상을 줄일 수 있었다. 이의 검증을 위하여 유도 가열 장치를 설계/제작하여 실험하였으며, 식품 건조 테스트를 행하였다.

  • PDF

The Induction Heating System of A Novel Automatic resonance point tracking method (새로운 자동 공진점 추종 방식의 유도가열 시스템)

  • Son, Seok-Yong;Kim, Chun-Sung;Kim, Sun-Pil;Kim, Se-Min;Park, Sung-Jun
    • Proceedings of the KIPE Conference
    • /
    • 2015.07a
    • /
    • pp.439-440
    • /
    • 2015
  • 유도가열은 석유, 가스 등의 연료를 사용하는 종래의 설비에 비해 에너지 효율이 높고 관리가 수월하며, 공해를 유발하지 않는 등의 많은 장점으로 인해 산업 분야에 다양하게 응용되어 사용하고 있다. 유도가열의 원리는 전자유도작용을 이용하여 와전류에 의한 손실과, 히스테리시스 손실에 의한 주울열이 발생하는데, 이렇게 발생된 열로 가열하는 방법이며 가열 속응성, 고효율, 친환경, 안정성의 장점을 갖는다. 그러나 공진형 유도가열 인버터 시스템은 환경의 변화나 피가열체의 부식 등의 이유로 공진주파수가 변하는 단점이 있다. 따라서 기존의 단점을 극복하기 위해 자동으로 공진점을 추종할 수 있는 알고리즘을 제안하였고, 기존의 복잡한 제어회로나 알고리즘을 극복하여 시스템의 간소화를 실현하였다.

  • PDF

The Characteristic Analysis of VVVf Type High Frequency Inverter considering Dead Time (Dead Time을 고려한 VVVF형 고주파 인버어터의 특성해석)

  • Oh, Seung-Hoon;Bae, Sang-Jun;Min, Byoung-Jae;Lee, Dal-Hae;Choi, Sang-Yong
    • Proceedings of the KIEE Conference
    • /
    • 1993.07b
    • /
    • pp.698-700
    • /
    • 1993
  • This paper describes characteristic analysis of VVVf type high-frequency considering dead time. Static power conversion are now used in a great variety of application including induction heating, high-frequency generation, DC/DC power converter, etc. In the circuit analysis, an offer circuit was compared with safety operating region and steady state characteristics considering dead time.

  • PDF

Fabricating Apparatus of Rheological Material for forging by Rotational Barrel (회전식 바렐에 의한 단조용 레오로지 소재 제조)

  • Kim T.W.;Seo P.K.;Oh S.W.;Kang C.G.
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 2005.10a
    • /
    • pp.645-648
    • /
    • 2005
  • The rotational barrel type equipment has been designed for the new rheology fabrication process. During the continuous rotation of barrel with a constant temperature, the shear rate is controlled with the rotation speed and rotation time of barrel. The barrel surface can be controlled the temperature by the induction heating and cooling system. Many experiments were widely examined by using this system with controlling the rotation speed and the rotation time. The possibility for the rheoforming process was investigated with microstructural characteristics.

  • PDF

Load Analysis and Calculation of Power Conversion System Capacity for Induction Heating Cleaning Device (유도가열방식 세정장치용 전력변환장치 용량 산정 및 부하 분석)

  • Jang, Eun Su;Park, Sang Min;Oh, Chang-Yeol;Lee, Byoung Kuk
    • Proceedings of the KIPE Conference
    • /
    • 2016.11a
    • /
    • pp.37-38
    • /
    • 2016
  • 본 논문에서는 유도가열방식 세정장치의 티타늄 용기 특성을 분석하고 전력변환장치를 설계한다. 코일에 흐를 전류를 계산하기 위한 용량 산정은 기체의 온도 변화량 및 용기 가열 시간을 고려하여 증기 가열에 필요한 열량을 수학적으로 분석하고 설계한 전력변환장치를 시뮬레이션을 통해 검증한다.

  • PDF

A Direct Single-phase Quasi-resonant AC-AC Converter with Zero Voltage Switching

  • Antchev, Mihail Hristov
    • Journal of Power Electronics
    • /
    • v.17 no.4
    • /
    • pp.860-873
    • /
    • 2017
  • The present article reports an analysis and investigation of a direct AC-AC quasi-resonant converter. A bidirectional power device, whose switching frequency is lower than the frequency of the current passing through the load, is used for its realization. The zero voltage switching mode is described when zero voltage on the power device is available by measuring it with the control system. The continuous current in the resonant inductance by switching the power device at zero voltage is considered, and it is characterized by two sub-modes. A mathematical analysis of the processes has been made and comparative results from the computer simulation and experimental study have been brought. The converter can be used in a wide areas of power electronics: induction heating, wireless power transfer, AC-DC converters, etc.

Modelling and Design of Control Circuit of Induction Heating Power Supply for Forging Application Using Current Source PWM Rectifier and Inverter (전류원 PWM 정류기 / 인버터를 이용한 단조용 유도가열 전원장치의 제어회로 모델링 및 설계)

  • Cjoi, Seung-Soo;Go, Moo-Seok;Kim, In-dong;Jung, Jang Han;Seo, Dong Hoan
    • Proceedings of the KIPE Conference
    • /
    • 2019.07a
    • /
    • pp.159-161
    • /
    • 2019
  • 현재 단조용 유도가열 전원으로 사용되는 전류원 SCR 정류기 / 인버터는 입력단의 낮은 역률과 높은 THd를 갖는다. 이러한 단점들 때문에 최근 유도가열 전원장치로써 IGBT PWM 전류원 정류기 및 인버터회로가 연구되고 있다. 본 논문에서는 IGBT PWM 정류기 및 인버터의 제어회로를 제안하고 제어회로의 모델링을 통해 제어기를 설계하여 실험을 통해 그 성능을 검증하였다.

  • PDF

Noise Reduction Method of Anyplace IH System with Alternative PDM Control Using PLL (PLL 기반 교번 PDM 제어를 통한 Anyplace IH 시스템의 용기 소음 저감 방안)

  • Kwon, Man Jae;Jang, Eunsu;Park, Sang Min;Lee, Byoung Kuk
    • Proceedings of the KIPE Conference
    • /
    • 2020.08a
    • /
    • pp.82-84
    • /
    • 2020
  • 본 논문에서는 용기 소음 저감을 위해 Anyplace induction heating (lH) 시스템에 적합한 설계 방안을 제시한다. 다수의 워킹 코일 및 인버터를 적용한 Anyplace lH 시스템에서 인접한 코일들이 서로 다른 동작 주파수로 용기를 가열 할 경우 주파수 차이에 따른 용기 소음이 발생한다. 따라서 용기의 근접 가열 시 발생하는 소음을 저감하기 위한 방안들을 비교 및 분석하고 실험 및 시뮬레이션을 통해 phase locked loop (PLL)을 이용한 교번 pulse density modulation (PDM) 제어를 적용한 시스템 설계 방안에 대한 타당성을 검증한다.

  • PDF

Changes of the phsico-Chemical Characteristics of oils treated by the ${\gamma}$-ray irradiation (I) -The Extracted soybean oil- (방사선 조사선량에 따른 유지의 이화학적 성질변화 (I))

  • 임국이
    • Journal of the Korean Home Economics Association
    • /
    • v.30 no.4
    • /
    • pp.77-88
    • /
    • 1992
  • To investigate the oxidative stabilities of the ${\gamma}$-ray irradiated soybean during storage and heating and some physico-chemical characteristics of soybean and the extracted soybean oil (SBO) with/without the ${\gamma}$-ray irradiation were determined. The ${\gamma}$-ray level use in irradiation for soybean were 2.5, 5.0 and 10.0 KGY respectively and Acid Value, Peroxide Value, Conjugated Diene Value, Composed Fatty Acids amounts, and Trans Fatty Acid occurrence were determined for all samples, which were incubated at 45$\pm$1$^{\circ}C$ for 25 days heated at 180$\pm$1$^{\circ}C$ for 30 hours. And these values of the ${\gamma}$-ray treated samples were compared to those of nontreated samples. The results were obtained as follows : 1. According to the increased level of the ${\gamma}$-ray irradiation, there was little difference in Dielectric Constant, Viscosity, and the Induction Period by Rancimat. But, in case of 5.0 KGY, oxidative stability was increased more twice than that of non-irradiation. In the quantity of fatty Acids composition of the extracted soybean oil irradiated with 10.0 KGY, palmitic, oleic and linoleic acids were less increased thanb those of non-irradiation, while stearic, linolenic acids were decreased. In the case of 2.5 KGY irradiation, stearic and oleic acids were increased. 2. The Acid Value of SBO according to the ${\gamma}$-ray irradiation level was almost not change, but was 0.1 lower than that of non-irradiation during incubation (45$\pm$1$^{\circ}C$). The Peroxide Value of SBO with the ${\gamma}$-ray irradiation, was very lower than that of non-irradiation, but its effect on oxidative stability was better of SBO treated with 5.0 KGY and 10.0 KGY. In the Fatty Acids composition of SBO, palmitic, stearic, oleic acids were increased, while linoleic, linolenic acids were decreased during incubation(45$\pm$1$^{\circ}C$). This tendency was more obvious due to the ${\gamma}$-ray level. While heating(180$\pm$1$^{\circ}C$), the Acid Value of SBO treated with the ${\gamma}$-ray irradiation was decreased, the Acid Value of SBO irradiated with 2.5 KGY was the lowest. Also the peroxide Values of SBO treated with 5.0 KGY, 10.0 KGY were very lower than that of non-irradiation. Conjugated Diene Value of SBO was almost unchanged according to the ${\gamma}$-level and heating time. 3. When the methyl linoleate was irradiated with the ${\gamma}$-ray, the Trans Fatty Acid was little produced. In case of SBO with non-irradiation, the trans C18:1 was occured about 6.5~7.9%, but trans C18:2 and C18:3 were not shown, while SBO irradiated with the ${\gamma}$-ray 2.5, 5.0, 10.0 KGY, trans C18:3 and C18:2 amount in SBO were increased according to heating time, but trans C18:3 was little occured. As these results, the effects of the ${\gamma}$-ray irradiation to oil containing food were to cut down the energy for food storage and to increase oxdative stability during storge. And also it was shown to be the best that 10.0 KGY of the ${\gamma}$-ray irradiation would be applied to soybean.

  • PDF

Analysis of Frequency Response Curve for Conduction-Cooled Power Capacitors (전도 냉각 파워 커패시터의 주파수 응답 곡선 분석)

  • An, Gyeong Moon;Kim, Hiesik
    • Journal of the Institute of Electronics and Information Engineers
    • /
    • v.53 no.10
    • /
    • pp.123-130
    • /
    • 2016
  • High-frequency induction heating equipment can heat the metal by applying a High-Frequency power to the resonant circuit. The resonance circuit is composed of the work coil and the conduction-cooled power capacitor, it influences the performance of the heat treatment equipment according to the characteristics of the capacitor. However, dependence on conduction-cooled power capacitor's import is high due to lack of core technology research and development. Minimizing the generation of internal heat transmitted inside during LC resonance, reduce the reactive power loss, there is a need for a capacitor within the voltage characteristic outstanding. To implement localization it is vital that prior study of the analysis on the frequency response characteristic for the finished capacitor advanced manufacturer be implemented. Studying the interpolation method to read the value at any point of the characteristic curve for a given log-log scale was applied to the analysis tool of the capacitor by my proposed algorithm. The simulation for reproducing frequency response curves was attempted by assuming a capacitor in a simplified series equivalent RC circuit to obtain the equivalent series resistance value. It was confirmed that the reproduction rate was the result value above 83% as compared to the simulation of the properties and characteristics on the actual reactive power for Peak value, and that the algorithm can be applicable when analyzing and predicting the characteristic curves of a simpled model capacitor.