• Title/Summary/Keyword: coupled inductor

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Wireless Synchronous Transfer of Power and Reverse Signals

  • Li, Yang;Li, Yumei;Feng, Shaojie;Yang, Qingxin;Dong, Weihao;Zhao, Jingtai;Xue, Ming
    • Journal of Power Electronics
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    • v.19 no.3
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    • pp.827-834
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    • 2019
  • Wireless power transfer via coupled magnetic resonances has been a hot research topic in recent years. In addition, the number of related devices has also been increasing. However, reverse signals transfer is often required in addition to wireless power transfer. The structure of the circuit for a wireless power transfer system via coupled magnetic resonances is analyzed. The advantages and disadvantages of both parallel compensation and series compensation are listed. Then the compensation characteristics of the inductor, capacitor and resistor were studied and an appropriate compensation method was selected. The reverse signals can be transferred by controlling the compensation of the resistor. In addition, it can be demodulated by extracting the change of the primary current. A 3.3 MHz resonant frequency with a 100 kHz reverse signals transfer system platform was established in the laboratory. Experimental results demonstrate that wireless power and reverse signals can be transferred synchronously.

Passive Suppression of Nonlinear Panel Flutter Using Piezoelectric Materials with Resonant Circuit

  • Moon, Seong-Hwan;Yun, Chul-Yong;Kim, Seung-Jo
    • Journal of Mechanical Science and Technology
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    • v.16 no.1
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    • pp.1-12
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    • 2002
  • In this study, a passive suppression scheme for nonlinear flutter problem of composite panel, which is believed to be more reliable than the active control methods in practical operations, is proposed. This scheme utilizes a piezoelectric inductor-resistor series shunt circuit. The finite element equations of motion for an electromechanically coupled system is derived by applying the Hamilton\\`s principle. The aerodynamic theory adopted for the present study is based on the quasi-steady piston theory, and von-barman nonlinear strain-displacement relation is also applied. The passive suppression results for nonlinear panel flutter are obtained in the time domain using the Newmark-$\beta$ method. To achieve the best damping effect, optimal shape and location of fille piezoceramic (PZT) patches are determined by using genetic algorithms. The effects of passive suppression are investigated by employing in turn one shunt circuit and two independent shunt circuits. Feasibility studies show that two independent inductor-resistor shunt circuits suppresses flutter more effectively than a single shunt circuit. The results clearly demonstrate that the passive damping scheme that uses piezoelectric shunt circuit can effectively attenuate the flutter.

A Phase-Shifted Full-Bridge Converter With a New Rectifier Circuit for Reducing Circuiting Current (순환전류 감소를 위한 새로운 정류회로를 갖는 위상천이 풀브리지 컨버터)

  • Choi, Byoung-Gi;Lee, Woo-seok;Lee, Il-Oun
    • The Transactions of the Korean Institute of Power Electronics
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    • v.26 no.3
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    • pp.237-240
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    • 2021
  • This research proposes a new rectifier circuit to reduce the circulating current of a phase-shifted full bridge converter. The proposed circuit is a structure in which the output inductor of the secondary rectifier circuit is changed to a coupled inductor in the phase-shifted full bridge with the existing center-tapped rectifier. The parts are rearranged after adding a diode. After applying the proposed circuit, the circulating current to the primary current of the transformer and the voltage stress of the rectifier diode on the secondary side of the transformer are reduced. Accordingly, the snubber loss of the rectifier is improved. By reducing the circulating current and snubber loss, the circuit achieves higher efficiency than conventional circuits. In this research, we present the structure of the proposed circuit, its strengths, and the analysis results from experiments. Furthermore, its effectiveness is verified through the experimental results of a prototype converter with an input of 300-400 V and an output of 50 V/1 kW.

Microwave Group Delay Time Adjuster Using Resonance Circuit (공진 회로를 이용한 마이크로파 군지연 시간 조정기)

  • Seo Su-Jin;Park Sang-Keun;Choi Heung-Jae;Jeong Yong-Chae;Yun Jae-Hun;Kim Chul-Dong
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.17 no.8 s.111
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    • pp.739-745
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    • 2006
  • This paper presents a method to control group delay tine using a resonance circuit. The group delay time adjuster(GDTA) that can control signal group delay time comprises a variable capacitance and a variable equivalent inductor. These are coupled in parallel at a node and also controlled by two bias voltages separately, A variable equivalent inductor is realized a transmission line terminated a variable capacitor. Group delay time can be controlled by change of capacitance and inductance, but the resonating frequency is fixed. When the proposed GDTA is fabricated on RFID Korean frequency band$(908.5{\sim}914 MHz)$, a group delay variation is obtained about 3 ns.

The Study on Electromagnetic Distribution of Electrodeless Fluorescent Lamp (무전극 형광램프의 페라이트 특성변화에 따른 전자계 분포)

  • Kim, Kwang-Soo;Jo, Ju-Ung;Her, In-Sung;Choi, Yong-Sung;Park, Dae-Hee
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2003.07b
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    • pp.1147-1150
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    • 2003
  • The RF inductive discharge or inductively coupled plasma (ICP) continues to attract growing attention as an effective plasma source in many industrial applications, the best known of which are plasma processing and lighting technology Although most practical ICPs operate at 13.56 (MHz) and 2.65 (MHz), the trend to reduce the operating frequency is clearly recognizable from recent ICP developments. In an electrodeless fluorescent lamp, the use of a lower operating frequency simplifies and reduces cost of rf matching systems and rf generators and can eliminate capacitive coupling between the inductor coil and plasma, which could be a strong factor in wall erosion and plasma contamination. In this study, the configuration of ferrite and fixture which operates at the frequency of 2.65 (MHz) will be discussed, by using the electromagnetic simulation (Maxwell 2D).

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A Study on Parallel Operation of PWM Inverters for High Speed and High Power Motor Drive System (초고속 및 대용량 전동기 구동을 위한 PWM 인버터 병렬 운전에 관한 연구)

  • Cho, Un-Kwan;Yim, Jung-Sik;Sul, Seung-Ki
    • The Transactions of the Korean Institute of Power Electronics
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    • v.15 no.3
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    • pp.244-251
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    • 2010
  • High speed motors have been widely used in industries to reduce system size and improve power conversion efficiency. However, the high speed motors sometimes suffer from core losses caused by PWM current ripple; noting that the phase inductance, $L_s$, of high speed motor is smaller than that of ordinary motors. In the proposed topology, three PWM inverters are connected in parallel through nine coupled inductors. Compared to the PWM current ripple of the conventional single inverter system, that of the proposed scheme can be conspicuously reduced without the voltage drop at the inductors. In this paper a theoretical analysis of the output voltage of the proposed topology is presented, and then the validity of the proposed method is verified by experimental results.

A study on chaos synchronization and secure communication of Chua's circuit with equivalent lossy transmission line (등가손실 전송선로를 가진 Chua 회로에서의 카오스 동기화 및 암호화 통신에 관한 연구)

  • 배영철
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.4 no.1
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    • pp.241-250
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    • 2000
  • Chua's circuit is a simple electronic network which exhibits a variety of bifurcation and attractors. The circuit consists of two capacitors, an inductor, a linear resistor, and a nonlinear resistor. In this paper, a transmitter and a receiver using two identical Chua's circuits are proposed and synchronizations and secure communication of a lossy equivalent transmission are investigated. Since the synchronization of the lossy equivalent transmission system is impossible by coupled synchronization, theory having both the drive-response and the coupled synchronization is proposed. The proposed method is synthesizing the desired information with the chaos circuit by adding the information signal to the chaos signal in the lossy equivalent transmission system.

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Research to Achieve Uniform Plasma in Multi-ground Capacitive Coupled Plasma

  • Park, Gi-Jeong;Lee, Yun-Seong;Yu, Dae-Ho;Lee, Jin-Won;Lee, Jeong-Beom;Jang, Hong-Yeong
    • Proceedings of the Korean Vacuum Society Conference
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    • 2014.02a
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    • pp.247.1-247.1
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    • 2014
  • The capacitive coupled plasma is used widely in the semiconductor industries. Especially, the uniformity of the industrial plasma is heavily related with defect ratio of devices. Therefore, the industries need the capacitive coupled plasma source which can generate the uniform plasma and control the plasma's uniformity. To achieving the uniformity of the large area plasma, we designed multi-powered electrodes. We controlled the uniformity by controlling the power of each electrode. After this work, we started to research another concept of the plasma device. We make the plasma chamber that has multi-ground electrodes imaginary (CST microwave studio) and simulate the electric field. The shape of the multi-ground electrodes is ring type, and it is same as the shape of the multi-power electrodes that we researched before. The diameter of the side electrode's edge is 300mm. We assumed that the plasma uniformity is related with the impedance of ground electrodes. Therefore we simulated the imaginary chamber in three cases. First, we connected L (inductor) and C (capacitor) at the center of multi-ground electrodes. Second, we changed electric conductivity of multi-ground electrode. Third, we changed the insulator's thickness between the center ground electrode and the side ground electrode. The driving frequency is 2, 13.56 and 100 MHz. We switched our multi-powered electrode system to multi-ground electrode system. After switching, we measured the plasma uniformity after installing a variable vacuum capacitor at the ground line. We investigate the effect of ground electrodes' impedance to plasma uniformity.

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A Study on the Three-Level Converter using Primary Auxiliary Circuit (1차측 보조회로를 이용한 Three-Level 컨버터에 관한 연구)

  • Bae, Jin-Yong;Kim, Yong;Cho, Kyu-Man
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.6
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    • pp.972-981
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    • 2008
  • A New ZVS(Zero Voltage Switching) and ZVZCS(Zero Voltage and Zero Current Switching) Three-Level Converter is proposed. The proposed converter presented in this paper used a phase shift control with a flying capacitor in the primary side to achieve ZVS for the all switch. A primary auxiliary circuit, which consists of one coupled inductor, is added in the primary to provide ZVZCS conditions to primary switches. Many advantages including simple circuit topology high efficiency, and low cost make this converter attractive for high power applications. The principle of operation, feature and design considerations are illustrated and verified through the experiment with a 2kW(27V, 74A) 40 kHz IGBT based experimental circuit.

A New Zero-Voltage Switching Three-Level Converter with Reduced Rectifier Voltage Stress (결합 인덕터를 적용한 고효율 3레벨 컨버터)

  • Kim, Keon-Woo;Han, Jung-Kyu;Moon, Gun-Woo
    • The Transactions of the Korean Institute of Power Electronics
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    • v.24 no.6
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    • pp.406-410
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    • 2019
  • Three-level (3L) DC-DC converters are appropriate for high-input-voltage applications. Although the voltage stress of TL converter switches can be reduced to half of the input voltage, the primary side has a large circulating current, which degrades efficiency. In this study, a dual half-bridge cascaded TL converter is presented to reduce this circulating current and thus decrease the conduction loss of the primary circuit. Moreover, the proposed converter can reduce the voltage stress of rectifier diodes, thereby reducing their conduction loss. Therefore, efficiency can be improved by reducing the conduction loss of the primary circuit and rectifier diodes.