• Title/Summary/Keyword: LC Resonant Circuit

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Improved Modification of the Closed-Loop-Controlled AC-AC Resonant Converter for Induction Heating

  • Dhandapani, Kirubakaran;Sathi, Rama Reddy
    • ETRI Journal
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    • v.31 no.3
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    • pp.298-303
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    • 2009
  • A single-switch parallel resonant converter for induction heating is implemented. The circuit consists of an input LC-filter, a bridge rectifier, and a controlled power switch. The switch operates in soft commutation mode and serves as a high frequency generator. The output power is controlled via the switching frequency. A steady state analysis of the converter operation is presented. A closed-loop circuit model is also presented, and the experimental results are compared with the simulation results.

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Characteristic Analyses of a Cycloconverter with a LC Resonant Circuit For a Induction Motor Drive (LC 공진회로를 이용한 유도전동기 구동용 사이크로콘버터의 특성해석)

  • Kim, Young-Seok;Cho, Kyu-Min
    • Proceedings of the KIEE Conference
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    • 1991.07a
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    • pp.573-578
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    • 1991
  • This paper presents a study on the cycloconverter with a LC resonant circuit for a induction motor drive which keeps the Input displacement factor at 1.0 by controlling real and reactive power independently under any load conditions. The input and the output current waveforms are sinusoid, and consequently Input power factor is nealy 1.0. In this paper, the operating principles of this cycloconverter, the control algorithms, the waveform analyses, and the characteristics of the system are described. The volts/hertz control of the induction motor is experimented, and the reasonability of this proposal is verified.

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Design of the High Efficiency Bidirectional Converter for DC Distributed Power System (직류 배전 시스템을 위한 고효율 양방향 컨버터의 설계)

  • Tran, Duc-Hung;Choi, Woojin
    • Proceedings of the KIPE Conference
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    • 2016.11a
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    • pp.5-6
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    • 2016
  • This paper introduces a high efficiency bidirectional resonant converter using an additional LC auxiliary circuit for dcdistribution applications. The LC auxiliary circuit operates as a variable inductor and the additional LC circuit helps to increase the effective magnetizing inductance, thereby reducing the turn-off and primary circulating current. A 5 kW bidirectional converter for dc-distribution system is implemented to verify the validity of the proposed method. The experimental results show the high efficiency characteristics of the proposed converter over the wide range of load in both direction of power flow. The maximum efficiency of the proposed system was 98.1 % at 3 kW.

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A Study on the Development of an Electronic Ballast for 70W Ceramic Discharge Metal Halide Lamps (70W 세라믹 방전관 메탈할라이드 램프용 전자식 안정기 개발에 관한 연구)

  • 김일권;길경석;이성근;김진모
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2002.05a
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    • pp.301-304
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    • 2002
  • This paper describes a design and fabrication of an electronic ballast for 70[W]ceramic discharge metal halide lamps. The proposed ballast is composed of a rectifier, an active PFC, a half-bridge inverter, a LC resonant circuit and a controller. The design also includes a specially designed time circuit which provides reignition of the lamp. Running frequency of the ballast is set at 45[KHz]to avoid acoustic-resonance and flicker. from the test results, input power factor and efficiency of the ballast were estimated 91[%] and 97.7[%], respectively.

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Comparison of Main Circuit Type Characteristics of LED Driver for Output Ripple Reduction (출력 리플 저감을 위한 LED 드라이버의 주회로 방식 특성 비교)

  • Park, Dae-Su;Kim, Tae-Kyung;Oh, Sung-Chul
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.20 no.3
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    • pp.491-499
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    • 2019
  • Recently, there has been increasing demand for power quality in power supply devices. The IEC 61000-3-2 standard requires that the AC / DC power supply for lighting meet the specifications for the power factor (PF) and total waveform distortion (THD). In addition, advanced countries in Europe are regulating the ripple rate as 15 ~ 30% for the flicker phenomenon caused by the change in the amount of foot energy due to the change in current of the output terminal. Therefore, domestic standards and regulations are being updated. This study adopted the Flyback converter to satisfy the PFC standard, and has the circuit first and second insulation function. To reduce the low frequency ripple of the LED current, Flyback, Coupled Inductor, LC parallel resonance filter, LLC resonance filter, and Cuk were simulated by PSIM to mimic each LED driving circuit. A coupled LC resonant circuit with a coupled inductor on the primary side and LC resonance on the secondary side was also proposed for output side ripple reduction.

The PWM Controlled Cycloconverter with a Resonant Circuit for a Induction Heating (LC공진회로를 이용한 유도가열용 PWM 제어형 사이클로콘버터)

  • Kim, Young-Seok;Kim, Hyun-Jung
    • Proceedings of the KIEE Conference
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    • 1991.11a
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    • pp.214-218
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    • 1991
  • This paper presents a PWM controlled cycloconverter with a DC resonant circuit for Induction heating. This cycloconverter converts commercial frequency power to high frequency power directly. So conversion efficiency improved. Controlling a input reactive power regardless of load power, it has sinusoidal input current waveforms as well as a input. displacement factor at 1.

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A Study on the PWM Controlled Cycloconverter with a Resonant Circuit for Induction Heating (공진회로를 이용한 유도가열용 PWM 제어형 사이크로콘버터에 관한 연구)

  • Kim, Young-Seok;Kim, Jin-Soo
    • Proceedings of the KIEE Conference
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    • 1990.11a
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    • pp.283-286
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    • 1990
  • This paper presents a PWM controlled cycloconverter with a LC resonant circuit for induction heating. This cycloconverter converts commercial frequency power to high frequency power directly. So conversion efficiency improved. Controlling a input reactive power regardless of load power, it has sinusoidal input current waveforms as well as a input displacement factor at 1.

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New Energy Recovery Concept for AC PDP Sustaining Driver Using Current Injection Method (CIM)

  • Lee, Jun-Young;Kim, Jin-Sung;So, Myeong-Seop;Cho, Bo-Hyung
    • Journal of Power Electronics
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    • v.2 no.3
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    • pp.189-198
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    • 2002
  • New concept of energy recovery for plasma display panel (PDP) Is proposed. Different from conventional LC resonant sustaining drivers, the current built up before inverting the polarity of the panel electrodes is utilized to change the panel Polarity together with energy Previously charged in Panel capacitance. This operation Provides zero -voltage-switching of switches and reduction of EMI by rejecting the surge current when the sustain switches are turned on. The build-up current helps to reduce transition time of panel polarity and may produce more stable light waveforms. This method shows a desirable characteristic that the circuit loss is similar to that of series resonant type energy recovery circuit which is very effective method.

A Telemetry Silicon Pressure Sensor of LC Resonance Type (LC공진을 이용한 원격측정용 압력센서의 제작 및 실험)

  • Kim, Hak-Jin;Kim, Soon-Young;Yang, Sang-Sik
    • Proceedings of the KIEE Conference
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    • 2001.07c
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    • pp.1872-1874
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    • 2001
  • This paper presents an implantable telemetry LC resonance-type pressure sensor to measure the cerebral ventricle pressure. The sensor consists of an inductor and a capacitor. The LC resonant circuit consists of the sensor and an external antenna coil that are coupled magnetically. The resonance frequency of the circuit decreases as the applied pressure increases the capacitance of the sensor. The sensor is designed in consideration of the biocompatibility and long lifetime for continuous monitoring of the ventricle pressure. The sensor is simple to fabricate and small in comparison with others reported previously. The inductor is fabricated by electroplating and the variable capacitor is constructed with a flexible p+ diaphragm. Also, the deflection of the diaphragm, the variation of the capacitance and the resonance frequency are analyzed and calculated.

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Single-Phase Improved Auxiliary Resonant Snubber Inverter that Reduces the Auxiliary Current and THD

  • Zhang, Hailin;Kou, Baoquan;Zhang, He;Zhang, Lu
    • Journal of Power Electronics
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    • v.16 no.6
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    • pp.1991-2004
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    • 2016
  • An LC filter is required to reduce the output current ripple in the auxiliary resonant snubber inverter (ARSI) for high-performance applications. However, if the traditional control method is used in the ARSI with LC filter, then unnecessary current flows in the auxiliary circuit. In addressing this problem, a novel load-adaptive control that fully uses the filter inductor current ripple to realize the soft-switching of the main switches is proposed. Compared with the traditional control implemented in the ARSI with LC filter, the proposed control can reduce the required auxiliary current, contributing to higher efficiency and DC-link voltage utilization. In this study, the detailed circuit operation in the light load mode (LLM) and the heavy load mode (HLM) considering the inductor current ripple is described. The characteristics of the improved ARSI are expressed mathematically. A prototype with 200 kHz switching frequency, 80 V DC voltage, and 8 A maximum output current was developed to verify the effectiveness of the improved ARSI. The proposed ARSI was found to successfully operate in the LLM and HLM, achieving zero-voltage switching (ZVS) of the main switches and zero-current switching (ZCS) of the auxiliary switches from zero load to full load. The DC-link voltage utilization of the proposed control is 0.758, which is 0.022 higher than that of the traditional control. The peak efficiency is 91.75% at 8 A output current for the proposed control, higher than 89.73% for the traditional control. Meanwhile, the carrier harmonics is reduced from -44 dB to -66 dB through the addition of the LC filter.