• Title/Summary/Keyword: parallel resonant

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An Improved High Efficiency Resonant Converter for the Contactless Power Supply with a Low Coupling Transformer (낮은 커플링 변압기를 갖는 비접촉 전원의 개선된 고효율 공진 컨버터)

  • Kong Young-Su;Kim Eun-Soo;Lee Hyun-Kwan
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.54 no.1
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    • pp.33-39
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    • 2005
  • Comparing with the conventional transformer without the air gap, a contactless transformer with the large air gap between the long primary winding and the secondary winding has increased leakage inductance and reduced magnetizing inductance. For transferring the primary power to the secondary one, the high frequency series resonant converter has been widely used for the contactless power supply system with the large air gap and the increased leakage inductance of the contactless transformer However, the high frequency series resonant converter has the disadvantages of the low efficiency and high voltage gain characteristics in the overall load range due to the large air gap and the circulating magnetizing current. In this paper, the characteristics of the high efficiency and unit voltage gain are revealed in the proposed three-level series-parallel resonant converter. The results are verified on the simulation based on the theoretical analysis and the 5kW experimental prototype.

Implementation of Zero-Ripple Line Current Induction Cooker using Class-D Current-Source Resonant Inverter with Parallel-Load Network Parameters under Large-Signal Excitation

  • Ekkaravarodome, Chainarin;Thounthong, Phatiphat;Jirasereeamornkul, Kamon
    • Journal of Electrical Engineering and Technology
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    • v.13 no.3
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    • pp.1251-1264
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    • 2018
  • The systematic and effective design method of a Class-D current-source resonant inverter for use in an induction cooker with zero-ripple line current is presented. The design procedure is based on the principle of the Class-D current-source resonant inverter with a simplified load network model that is a parallel equivalent circuit. An induction load characterization is obtained from a large-signal excitation test-bench based on parallel load network, which is the key to an accurate design for the induction cooker system. Accordingly, the proposed scheme provides a systematic, precise, and feasible solution than the existing design method based on series-parallel load network under low-signal excitation. Moreover, a zero-ripple condition of utility-line input current is naturally preserved without any extra circuit or control. Meanwhile, a differential-mode input electromagnetic interference (EMI) filter can be eliminated, high power quality in utility-line can be obtained, and a standard-recovery diode of bridge-rectifier can be employed. The step-by-step design procedure explained with design example. The devices stress and power loss analysis of induction cooker with a parallel load network under large-signal excitation are described. A 2,500-W laboratory prototype was developed for $220-V_{rms}/50-Hz$ utility-line to verify the theoretical analysis. An efficiency of the prototype is 96% at full load.

Resonant Analysis of Load Commutated Current Source Inverter System (부하(負荷) 전류식(轉流式) 전류형(電流形) 인버터 시스템의 공진(共振) 해석(解析))

  • Sim, Cheon-Bo;Jeong, Seung-Gi
    • Proceedings of the KIEE Conference
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    • 1991.11a
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    • pp.156-159
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    • 1991
  • At LCCSI system, output capacitor of inverter and inductor of load motor raise mutuality operation. This parallel resonant increase equivalent impedance of inverter load and give wrong effect at LCCSI system. This paper carried out resonant analysis of LCCSI system. The result of analysis, particular resonant point of two was discovered that a resonant of S=0 vicinity and $\beta$ resonant of S=1 vicinity. In addition to, the case of harmonics resonant not come from $\alpha$ resonant but come from $\beta$ resonant. A moment of working of LCCSI system, resonant line must not suddenly variation. Accordingly, resonant line is a necessity for doing $f{\alpha}$ vicinity by properly capacitor value selection.

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Study on Arrangement of Self-Resonant Coils in Wireless Power Transfer System Based on Magnetic Resonance (자기 공명 무선 전력 전송 시스템에서 공진 코일의 배열에 관한 연구)

  • Kim, Jin-Wook;Ji, Hyeon-Ho;Choi, Yeon-Gyu;Yun, Young-Hyun;Kim, Kwan-Ho;Park, Young-Jin
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.21 no.6
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    • pp.564-572
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    • 2010
  • In this paper, characteristics on arrangement of coils in the wireless power transfer system based on magnetic resonance is presented. A helical structure is used for a self-resonant coil. To design a proper self-resonant helical coil, its inductance and capacitance are obtained. Using the finite element method, the self-resonant coil designed is simulated and characteristics of wireless power transfer with various arrangement between Tx and Rx resonant coils is analyzed. For verification, a prototype of a wireless power transfer system based on magnetic resonance is fabricated and efficiency of different arrangement such as both vertical and parallel arrangements is measured. From the measurement, transmission efficiency of 50 % for parallel arrangement is obtained within twice the diameter of the coil while for the vertical arrangement it is measured within one and a half diameter of the coil. Maximum efficiency of 84.25 % is observed at the distance 40 cm from the resonant coil in the case of parallel arrangement.

A study on the Parallel Resonant Converter with Pulse Width Modulation Control (PWM 제어에 의한 병렬 공진형 컨버터에 관한 연구)

  • Choi, Jang-Guen;Cha, In-Su;Pak, Hae-Am;Ree, Woo-Sun
    • Proceedings of the KIEE Conference
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    • 1992.07b
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    • pp.1142-1146
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    • 1992
  • This paper deals with the operation analysis of the half-bridge parallel-resonant converter with P.W.M. control. The converter operates at fixed frequency, in the continuous and discontinuous current mode. A simplified theorectical steady-state analysis is developed and the converter characteristics are presented.

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Design of High Frequency Inverter with Series-parallel Load-Resonant for Induction Heating application (유도가열기용 직.병렬 공진 고주파 인버터의 설계)

  • 홍순일;손의식
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.14 no.6
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    • pp.12-17
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    • 2000
  • IN induction heating system the high frequency operation allows a rapid response to current fluctuation in the inverter and result in improved welding quality. To work induction heating of nonferrous metals, a welding power supply is need high working frequency and high power. This paper is shown design technique for increasing working frequency in induction heating for welding coppers. A series-parallel resonate inverter consists of H-type bridges, each of whose arms is composed of a combination of two parallel IGBTs. Inverter operating with the fixed frequency is controlled by pulse width modulation (PWM). As switching adapted the Zero-Voltage Switching technique to reduce switching losses the system is high efficiency. The propose inverter has feature which is high efficiency for very wide load variations with a narrow range of duty cycle ratio control and load short circuit capability. Detailed experimental results obtained from a 48[V] output, 500[W] experimental inverter are presented to verify the concept.

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A Study on the Output Voltage Control of Series-Parallel Resonant type DC/DC Converter for Transverse Flux Linear Motor (TELM에 적용한 직병렬 공진형 DC/DC 컨버터의 출력전압 제어에 관한 연구)

  • Hwang Gye Ho;Lee Young Sik;Jeon Jin Yong;Bang Deok Je;Kim Ho Jong;Shin Byoung Chol;Kang Do Hyun;Kim Jong Moo
    • Journal of the Semiconductor & Display Technology
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    • v.4 no.1 s.10
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    • pp.9-16
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    • 2005
  • In this paper, with loosely coupled transformer Relies-parallel resonant type DC/DC converter is analyzed and adopted to the power source of a TFLM(Transverse Flux Linear Motor). To get more efficient operating mode of the series-parallel resonant type DC/DC converter, theoretical analysis using normalized parameters are accepted. The analysis includes a specially made ferrite transformer with two separately wound half cores in order to evaluate analytically and experimentally the changes in magnetizing the leakage fluxes and inductances caused by the distance between the halves. The proposed converter must be operated in switching Pattern III among the three switching patterns for the Zero Voltage Switching operation. According to Pulse Frequency Modulation(PFM) control method, the output voltage of the proposed circuit can be controlled. The results of the theoretical development are compared with practical measurements from a prototype system.

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Single-Phase Current Source Induction Heater with Improved Efficiency and Package Size

  • Namadmalan, Alireza;Moghani, Javad Shokrollahi
    • Journal of Power Electronics
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    • v.13 no.2
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    • pp.322-328
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    • 2013
  • This paper presents a modified Current Source Parallel Resonant Push-pull Inverter (CSPRPI) for single phase induction heating applications. One of the most important problems associated with current source parallel resonant inverters is achieving ZVS in transient intervals. This paper shows that a CSPRPI with the integral cycle control method has dynamic ZVS. According to this method, it is the Phase Locked Loop (PLL) circuit that tracks the switching frequency. The advantages of this technique are a higher efficiency, a smaller package size and a low EMI in comparison with similar topologies. Additionally, the proposed modification results in a low THD of the ac-line current. It has been measured as less than %2. To show the validity of the proposed method, a laboratory prototype is implemented with an operating frequency of 80 kHz and an output power of 400 W. The experimental results confirm the validity of the proposed single phase induction heating system.

A Novel Type of Discrete Time Predictive Current Controllers for Parallel Resonant Inverters (병렬 공진형 인버터에서 사용되는 새로운 형태의 이산시간 예측 전류 제어기)

  • Huh, Sung-Hoi;Choy, Ick;Kim, Kwon-Ho;Ahn, Hyun-Sik;Kim, Do-Hyun
    • Proceedings of the KIEE Conference
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    • 1996.07a
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    • pp.309-311
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    • 1996
  • In this paper, we propose two types of novel discrete time current control methods of modified fixed band hysteresis control and optimal control for Parallel Resonant DC Link Inverters(PRDCLI). Because zero bus voltage intervals are generated on the DC link of PRDCLI, we can obtain the information of counter electromotive force(emf) by a simple estimation strategy. The proposed current controllers predict the currents of the next resonant cycle using the obstained information of counter emf and the average values of DC link voltages. The computer simulation results for a simple equivalent circuit of induction motor show that the proposed control methods are more effective than conventional methods.

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A Performance Comparison of Series and Parallel Resonant Inverters in High-Frequency Applications (직렬형 및 병렬형 고주파 (공진형) 인버터의 특성연구)

  • Kim, E.S.;Kim, J.S.;Byun, Y.B.;Lee, J.M.
    • Proceedings of the KIEE Conference
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    • 1991.07a
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    • pp.516-520
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    • 1991
  • This paper presents a comparative analysis of two inverter power supply topologies for induction heating and melting applications. The comparison is based on criteria such as resonant condition, component ratings, minimum and maximum operating frequencies, operation under varying load conditions, inverter starting current, and diode reverse recovery time. The voltage source series/parallel resonant inverters are found to offer the best overall performance with respect to converter utilization.

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