• Title/Summary/Keyword: parallel resonant

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Frequency Controlled Series Resonant Converter System for Power Supply of Communication Station (통신 기지국 전원용 주파수 제어 직렬 공진형 컨버터 시스템)

  • 지준근;임영하
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.4 no.4
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    • pp.323-328
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    • 2003
  • In this paper new control strategy of series resonant converter system for power supply of communication station is suggested. Frequency controlled series resonant converter system is robust to load variations because it is POSR(Parallel Output Series Resonant: POSR) type. And it provides stable output voltage by changing switching frequency to input voltage variations. Firstly, operation analysis about suggested series resonant converter system was carried. Then simulations using ACSL(Advanced Continuous Simulation Langage) and experiments to actual system were carried to prove characteristics of suggested system.

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Characteristics Analysis of Instantaneous Current Resultant Type Load Parallel High Frequency Resonant Inverter (순시전류합성형 부하병렬 고주파 공진 인버터의 특성해석)

  • 조규판;원재선;이봉섭;심광렬;배영호
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2002.11a
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    • pp.293-296
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    • 2002
  • This paper describes the instantaneous current resultant type load parallel high frequency resonant inverter consisting of three unit half-bridge serial and parallel resonant inverter can be used as power source of induction heating. This proposed inverter can reduce distribution of the switching current because of using the current of serial resonant circuit to the input current of the parallel one. The analysis of the proposed circuit is generally described by using the normalized parameters. Also, the principle of basic operating and the its characteristics are estimated by the parameters such as switching frequency($\mu$), load resistance(λ). Experimental results are presented to verify theoretical discussion. This proposed inverter will can be practically used as a power supply in various fields as induction heating application, DC-DC converter etc.

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Series-parallel resonant converter using a contactless power supply for the efficiency improvement (효율 개선을 위한 직${\cdot}$병렬 공진컨버터 적용 비접촉 전원)

  • Kong Y.S.;Lee H.K.;Kim E.S.;Cho J.G.;Kim J.M.
    • Proceedings of the KIPE Conference
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    • 2004.11a
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    • pp.45-48
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    • 2004
  • To improve the efficiency characteristics in the resonant converter using the contact-less power supply with the large air-gap and the long primary winding, this paper suggests the three-level series-parallel resonant converter(SPRC). The voltage gain characteristics of the proposed converter have the unit gain in a resonance frequency point of the series and parallel, and input voltage and current in the primary of SPRC are always In phase for the all equivalent load resistance because of the parallel resonant tank of the high impedance. The results are verified on the simulation based on the theoretical analysis and the 4kW experimental prototype.

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Quasi-Parallel Resonant DC-link Inverter with One Additional Switching Device (하나의 추가 스위칭 소자를 갖는 유사병렬 공진형 DC-link 인버터)

  • 정용채
    • The Transactions of the Korean Institute of Power Electronics
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    • v.5 no.2
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    • pp.170-175
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    • 2000
  • A new quasi-parallel resonant DC link inverter is proposed for three phase soft switching application. By i inserting only one additional switch, the proposed inverter excludes both voltage stresses and restricted PWM p problems, which are demerits of the conventional resonant inverter. In this paper, the circuit operations are e explained in detail using the operational mode analysis of the proposed inverter and design methods of the r resonant components are suggest('x:l. Lastly, the applicable possibility of the proposed inverter is vel예fied t through the experimental results.

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Self-Oscillating Switching Technique for Current Source Parallel Resonant Induction Heating Systems

  • Namadmalan, Alireza;Moghani, Javad Shokrollahi
    • Journal of Power Electronics
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    • v.12 no.6
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    • pp.851-858
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    • 2012
  • This paper presents resonant inverter tuning for current source parallel resonant induction heating systems based on a new self oscillating switching technique. The phase error is suppressed in a wide range of operating frequencies in comparison with Phase Locked Loop (PLL) techniques. The proposed switching method has the capability of tuning under fast changes in the resonant frequency. According to this switching method, a multi-frequency induction heating (IH) system is proposed by using a single inverter. In comparison with multi-level inverter based IH systems, the advantages of this technique are its simple structure, better transients and wide range of operating frequencies. A laboratory prototype was built with an operating frequency of 35 kHz to 55 kHz and 300 W of output power. The performance of the IH system shows the validity of the new switching technique.

An improved LCLC Resonant Converter using Auxiliary winding of Resonant Inductor (공진 인덕터 보조권선을 이용한 개선된 LCLC 공진형 컨버터)

  • 백주원;이영식;정창용;조정구;김흥근
    • Proceedings of the KIPE Conference
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    • 1999.07a
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    • pp.472-475
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    • 1999
  • An improved series-parallel resonant converter using auxiliary winding of resonant is presented. The conventional series-parallel resonan converter and newly developed converter are compared for high voltage application. This proposed converter gives several merits such a wide load ranges, small circulating current, low peak voltage at no load. Two experimental results for the proposed converter and conventional one are presented for conventional LCC type converter and the proposed one.

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A Study on Improving Characteristics in the Parallel Resonant DC Link Inverter (병렬공진형 직류 링크 인버터의 특성 개선에 관한 연구)

  • Beak, J.W.;Yoo, D.W.;Kim, J.S.;Lim, G.H.
    • Proceedings of the KIEE Conference
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    • 1994.07a
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    • pp.429-431
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    • 1994
  • A parallel resonant dc link inverter, one of the many resonant inverters, has some superior characteristics in camparision with other resonant inverters. But loss of the resonant oscillation and occurrence of high peak voltage in the resonant capacitor of these inverters are serious problems. In this paper, we investigate a control method for resonant dc link inverters which can overcome these problems. Experimental results are presented to show superior operation of the resonant dc link inverter using the proposed control method.

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A Study on the Series and Parallel Resonant Filters for Harmonic Currents Reduction of Nonlinear Loads (비선형부하의 고조파전류 저감을 위한 직렬 및 병렬 동조필터에 관한 연구)

  • 김경철;강윤모;백승현;김종욱
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.17 no.6
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    • pp.113-118
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    • 2003
  • This paper characterizes typical nonlinear loads into two types of harmonic sources, i.e., harmonic voltage source and harmonic current source. A series resonant filter is very effective in harmonic reduction for harmonic voltage source type of nonlinear loads such as personal computer loads with smoothing dc capacitors. A parallel resonant filter is suited for current source type of nonlinear loads such as ac drives with smoothing dc reactors. General compensation characteristics and comparison of series and parallel resonant filters are given analytically and experimentally. Compliance with IEC Std 1000-3-2 has been evaluated for limiting harmonic distortion.

A Novel Zero-Voltage-Switching Push-Pull Forward Converter with a Parallel Resonant Network

  • Cai, Chunwei;Shi, Chunyu;Guo, Yuxing;Yang, Zi;Meng, Fangang
    • Journal of Power Electronics
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    • v.17 no.1
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    • pp.20-30
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    • 2017
  • A novel zero-voltage-switching (ZVS) push-pull forward converter with a parallel resonant network is presented in this paper. The novel topology can provide a releasing loop for the energy storage in a leakage inductor for the duration of the power switching by the resonant capacitors paralleled with the primary windings of the transformer. Then the transformer leakage inductor is utilized to be resonant with the parallel capacitor, and the ZVS operation is achieved. This converter exhibits many advantages such as lower duty-cycle losses, limited peak voltage across the rectifier diodes and a higher efficiency. Furthermore, the operating principles and key problems of the converter design are analyzed in detail, and the ZVS conditions are derived. A 500W experimental converter prototype has been built to verify the effectiveness of the proposed converter, and its maximum efficiency reaches 94.8%.

A Current-Fed Parallel Resonant Push-Pull Inverter with a New Cascaded Coil Flux Control for Induction Heating Applications

  • Namadmalan, Alireza;Moghani, Javad Shokrollahi;Milimonfare, Jafar
    • Journal of Power Electronics
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    • v.11 no.5
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    • pp.632-638
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    • 2011
  • This paper presents a cascaded coil flux control based on a Current Source Parallel Resonant Push-Pull Inverter (CSPRPI) for Induction Heating (IH) applications. The most important problems associated with current source parallel resonant inverters are start-up problems and the variable response of IH systems under load variations. This paper proposes a simple cascaded control method to increase an IH system's robustness to load variations. The proposed IH has been analyzed in both the steady state and the transient state. Based on this method, the resonant frequency is tracked using Phase Locked Loop (PLL) circuits using a Multiplier Phase Detector (MPD) to achieve ZVS under the transient condition. A laboratory prototype was built with an operating frequency of 57-59 kHz and a rated power of 300 W. Simulation and experimental results verify the validity of the proposed power control method and the PLL dynamics.