• Title/Summary/Keyword: High frequency resonant inverter

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Start-up Control of LLC Resonant Inverter for Microwave Oven Application (전자레인지용 LLC 공진형 인버터의 기동 제어)

  • Kang, Kyelyong;Kim, Heung-Geun;Cha, Honnyong
    • The Transactions of the Korean Institute of Power Electronics
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    • v.22 no.5
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    • pp.463-468
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    • 2017
  • One of the most critical part for magnetron driving in microwave oven is start-up control. For this, switching frequency of resonant inverter should be carefully controlled in order to supply sufficient power to the filament of the magnetron and to prevent rectifier diode from destruction caused by the excessive voltage across them. This paper proposes a novel start-up control strategy for LLC resonant inverter for microwave oven considering the non-oscillation mode time and the magnetron voltage during the start-up process. The validity of the proposed method is verified through the experiment with 1,200W microwave oven using LLC resonant inverter.

A NOVEL ZVS-PWM QUASI-RESONANT INVERTER WITH ACTIVE VOLTAGE-CLAMPED CAPACITOR FOR HIGH-FREQUENCY INDU-HEATED APPLIANCE

  • K.Izaki;I.Hirota;H.Yamashita;H.Omori;K.Matsumoto;K.Nishida;J.M.Sun;Na, M.kaoka
    • Proceedings of the KIPE Conference
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    • 1998.10a
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    • pp.1047-1050
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    • 1998
  • This paper describes an advanced prototype of voltage-fed zero voltage soft-switching PWM resonant inverter with an active voltage clamped capacitor, which is put into practice for high-frequency high-power induction-heated appliances. This application-specific quasi-resonant inverter using the latest generation IGBTs for soft-switching can regulate its output power under a principle of a fixed frequency ZVS-PWM strategy. Its operating principle and unique features are presented as compared with a conventional quasi-resonant ZVS inverter for induction-heated cooker, together with its power regulation characteristics on the basis of its simulation and experimental results. The steady-state performances of this inverter developed for multi-burner type induction-heated food cooking appliance are evaluated and discussed from a practical point of view.

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Compact Wireless IPT System Using a Modified Voltage-fed Multi-resonant Class EF2 Inverter

  • Uddin, Mohammad Kamar;Mekhilef, Saad;Ramasamy, Gobbi
    • Journal of Power Electronics
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    • v.18 no.1
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    • pp.277-288
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    • 2018
  • Wireless inductive power transfer (IPT) technology is used in many applications today. A compact and high-frequency primary side inverter is one of the most important parts of a WPT system. In this study, a modified class EF-type voltage-fed multi-resonant inverter has been proposed for WPT application at a frequency range of 85-100 kHz. Instead of an infinite input choke inductor, a resonant inductor is used to reduce loss and power density. The peak voltage stress across the MOSFET has been reduced to almost 60% from a class-E inverter using a passive clamping circuit. A simple yet effective design procedure has been presented to calculate the various component values of the proposed inverter. The overall system is simulated using MATLAB/SimPowerSystem to verify the theoretical concepts. A 500-W prototype was built and tested to validate the simulated results. The inverter exhibited 90% efficiency at nearly perfect alignment condition, and efficiency reduced gradually with the misalignment of WPT coils. The proposed inverter maintains zero-voltage switching (ZVS) during considerable load changes and possesses all the inherent advantages of class E-type inverters.

Current-fed Push-Pull type high frequency resonant inverter for wax-sealing

  • Won, Jae-Sun;Kim, Dong-Hee;Ro, Chae-Cyun;Kim, Min-Huei
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2000.11a
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    • pp.225-230
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    • 2000
  • This paper describes a double-ended current fed push-pull type high frequency resonant inverter used as the power supply for wax-sealing. The proposed inverter can realize ZVS operation by using resonant capacitor to ZVS capacitor and has some merits not only reduction of switch current distribution but also extension of load range compare to the conventional single-ended current fed push-pull type high frequency resonant inverter. This analysis of proposed circuit uses normalized parameter ad characteristic estimation which is needed in each step before design is generally described according to normalized frequency($\mu$), normalized resistance(λ) and parameters. It is also presented as an example of method of the circuit design based on estimation analysis values from theoretical analysis. The theoretical analysis is proved through experiment and this circuit shows that it can be used practically as the power supply system for wax-sealing and DC-DC converter.

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Power Supply for Induction Heating using High Frequency Twin Resonant Inverter (TWIN RESONANT 방식을 이용한 고주파 공진형 유도가열 전원장치)

  • Kwon, Soon-Kurl;Park, Gil-Tae;Kim, Yo-Hee;Jeo, Ki-Yeon;Yoo, Dong-Wook
    • Proceedings of the KIEE Conference
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    • 1992.07b
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    • pp.1108-1113
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    • 1992
  • In this paper, the high frequency twin resonant inverter using MOSFET is presented. The output control is excellent and the EMI noise is reduced, because the output appear as the vector sum of current in each unit inverter. The output voltage and the output current of the inverter are controlled by PLL. In this paper, the principle of the twin resonant method is described. And computer simulations and experimental results are shown.

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Design and analysis of Push-pull type Resonant Inverter for CCFL Drive (CCFL구동용 Push-Pull 방식 공진형 인버터의 특성해석)

  • Kim, Cherl-Jin;Ji, Jae-Geun;Jang, Jae-Wan;Lee, Hee-Heung;Kim, Young-Tae
    • Proceedings of the KIEE Conference
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    • 2002.07b
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    • pp.1184-1186
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    • 2002
  • Recently, according to the industrial development relative to multimedia, demand of display system is radically increase, thus development for power supply of back-lighting is advanced lively. Fluorescent lamp operated at high frequency by the electronic ballast provide benefits like unnoticeable flicker effect and higher luminous efficiency. This paper presents analysis of Push-Pull type resonant inverter for CCFL drive for stable characteristic and life improvement of fluorescent lamp operated at high frequency. Also it has proposed design procedure of Current-Fed type resonant inverter. On the basis of equivalent circuit, component characteristic and suitable region of operation frequency from simulation using Matlab and Pspice is predicted. Suitability of applied equivalent model and validity of design process from the experimental results with CCFL inverter.

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Digital Control of Two-Stage Electronic ballast for HID Lamps (2-단계 HID 램프용 전자식 안정기의 디지털 제어)

  • Lee, Woo cheol
    • Proceedings of the KIPE Conference
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    • 2013.11a
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    • pp.229-230
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    • 2013
  • The conventional Three-Stage electronic ballast is stable, but Two-Stage electronic ballast has been researching because of efficiency. Three-Stage electronic ballast is consisted of PFC circuit, buck converter, and inverter circuit, but Two-stage is consisted of PFC circuit, Buck-Inverter full bridge circuit. The Buck-Inverter full bridge inverter consists of two half bridge inverters for low frequency switching, and high frequency switching. In the case of street lamp it is far from a lamp to a ballast, the conventional pulsed high voltage ignitor can not turn on the HID lamps because of reduction of ignition voltage. Therefore, it needs to do the research on a resonant ignition to turn on the HID lamps. Therefore, in the Two-Stage electronic ballast which has the resonant tank for ignition, the transient resonant current because of low frequency changing is analyzed, the novel algorithm is proposed to resuce the transient current.

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Design of the High Frequency Resonant Inverter for Corona Surface Processes

  • Choi, Chul-Yong;Lee, Dae-Sik
    • Proceedings of the Korea Society of Information Technology Applications Conference
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    • 2005.11a
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    • pp.119-122
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    • 2005
  • A algorithm for control and performance of a pulse-density-modulated (PDM) series-resonant voltage source inverter developed for corona-dischange precesses is presented. The PDM inverter produces either a square-wave ac-voltage state or a zero-voltage state at its ac terminals to control the average output voltage under constant dc voltage and operating frequency. Moreover it can achieve zero-current-switching (ZCS) and zero-voltage-switching (ZVS) in all the operating condition for a reduction of switching lost. Even though the corona discharge load with a strong nonlinear characteristics, new high frequency resonant inverter is shown the wide range power control from 5% to 100%.

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Design and Development of a High-Voltage Transformer-less Power Supply for Ozone Generators Based on a Voltage-fed Full Bridge Resonant Inverter

  • Amjad, Muhammad;Salam, Zainal;Facta, Mochammad;Ishaque, Kashif
    • Journal of Power Electronics
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    • v.12 no.3
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    • pp.387-398
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    • 2012
  • It is known that transformer based power supplies for ozone generators have low efficiency, high cost and exhibits a limited frequency range of operation. To overcome these disadvantages, this paper proposes a high frequency ozone generator with the absence of a transformer. The voltage step-up is achieved only by utilizing the resonant tank. This is made possible by a novel combination of ozone chamber materials that allow ozone to be generated at only 1.5 - 3.5 $kV_{p-p}$. The input to the resonant tank is driven by a PWM full bridge resonant inverter. Furthermore, zero-current zero-voltage switching (ZCZVS) operation is achieved by employing a duty factor of 25% between the switches of the full bridge. The advantages of the proposed system include high efficiency, low cost and the ability to control ozone production by varying the input voltage to the inverter. The prototype is verified by both simulation and experimental results.

A Study on Characteristic Analysis of High Frequency Generating Circuit Integrated Chopper-Inverter with High Power-Factor (고역률 초퍼-인버터 일체형 고주파 발생회로의 특성해석에 관한 연구)

  • Won Jae-Sun;Park Jae-Wook;Nam Seung-Sik;Lee Bong-Seob;Seok Jul-Ki;Kim Dong-Hee
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.53 no.10
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    • pp.610-617
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    • 2004
  • This paper presents a novel high frequency generating circuit integrated chopper-inverter using ZVS with high power-factor. The proposed topology is integrated half-bridge boost rectifier as power factor corrector(PFC) and half-bridge high frequency resonant inverter into a single-stage. The input stage of the half-bridge boost rectifier works in discontinuous conduction mode(DCM) with constant duty cycle and variable switching frequency. So that a boost converter makes the line current follow naturally the sinusoidal line voltage waveform. Simulation results have demonstrated the feasibility of the proposed high frequency resonant inverter. Characteristics values based on characteristics analysis through circuit analysis is given as basis data in design procedure. Also, experimental results are presented to verify theoretical discussion. This proposed inverter will be able to be practically used as a power supply in various fields as induction heating applications. fluorescent lamp and DC-DC converter etc.