• Title/Summary/Keyword: Switched inductor

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Zero Voltage Switched Converter with Reduced Conduction Loss of Auxiliary Switch (보조 스위치의 전도손실을 줄인 영전압 스위칭 방식의 컨버터)

  • Joung, Gyu-Bum
    • Journal of the Korean Institute of Telematics and Electronics S
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    • v.36S no.2
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    • pp.131-137
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    • 1999
  • New zero voltage switched(ZVS) converter in which main switch is switched at zero voltage is proposed. A resonant inductor of conventional ZVS PW converter is replaced to two small saturable inductors in order to reduce conduction loss of auxiliary switch. Therefore, the switching loss of main switch is very low, and conduction losses of the main and auxiliary switch are lowered. The ZVS and above characteristics are verified by experimental results for a 200 kHz operation.

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Novel Single-inductor Multistring-independent Dimming LED Driver with Switched-capacitor Control Technique

  • Liang, Guozhuang;Tian, Hanlei
    • Journal of Power Electronics
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    • v.19 no.1
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    • pp.1-10
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    • 2019
  • Current imbalance is the main factor affecting the lifespan of light-emitting diode (LED) lighting systems and is generally solved by active or passive approaches. Given many new lighting applications, independent control is particularly important in achieving different levels of luminance. Existing passive and active approaches have their own limitations in current sharing and independent control, which bring new challenges to the design of LED drivers. In this work, a multichannel resonant converter based on switched-capacitor control (SCC) is proposed for solving this challenge. In the resonant network of the upper and lower half-bridges, SCC is used instead of fixed capacitance. Then, the individual current of the LED array is obtained through regulation of the effective capacitance of the SCC under a fixed switching frequency. In this manner, the complexity of the control unit of the circuit and the precision of the multichannel outputs are further improved. Finally, the superior performance of the proposed LED driver is verified by simulations and a 4-channel experimental prototype with a rated output power of 20 W.

A Non-isolated High Step-up DC/DC Converter with Low EMI and Voltage Stress for Renewable Energy Applications

  • Baharlou, Solmaz;Yazdani, Mohammad Rouhollah
    • Journal of Electrical Engineering and Technology
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    • v.12 no.3
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    • pp.1187-1194
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    • 2017
  • In this paper, a high step-up DC-DC PWM converter with continuous input current and low voltage stress is presented for renewable energy application. The proposed converter is composed of a boost converter integrated with an auxiliary step-up circuit. The auxiliary circuit uses an additional coupled inductor and a balancing capacitor with voltage doubler and switching capacitor technique to achieve high step-up voltage gain with an appropriate switch duty cycle. The switched capacitors are charged in parallel and discharged in series by the coupled inductor, stacking on the output capacitor. In the proposed converter, the voltage stress on the main switch is clamped, so a low voltage switch with low ON resistance can be used to reduce the conduction loss which results in the efficiency improvement. A detailed discussion on the operating principle and steady-state analyses are presented in the paper. To justify the theoretical analysis, experimental results of a 200W 40/400V prototype is presented. In addition, the conducted electromagnetic emissions are measured which shows a good EMC performance.

A Novel Auxiliary Edge-Resonant Snubber-Assisted Soft Switching PWM High Frequency Inverter with Series Capacitor Compensated Resonant Load for Consumer Induction Heating

  • Ahmed Nabil A.;Iwai Toshiaki;Omori Hideki;Lee Hyun-Woo;Nakaoka Mutsuo
    • Journal of Power Electronics
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    • v.6 no.2
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    • pp.95-103
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    • 2006
  • In this paper, a novel prototype of auxiliary switched capacitor assisted voltage source soft switching PWM Single-Ended Push Pull (SEPP) series capacitor compensated load resonant inverter with two auxiliary edge resonant lossless inductor snubbers is proposed and discussed for small scale consumer high-frequency induction heating (IH) appliances. The operation principle of this inverter is described by using switching mode equivalent circuits. The newly developed multi resonant high-frequency inverter using trench gate IGBTs can regulate its output AC power via constant frequency edge-resonant associated soft switching commutation by using an asymmetrical PWM control or duty cycle control scheme. The brand-new consumer IH products which use the newly proposed edge-resonant soft switching PWM-SEPP type series load resonant high-frequency inverters are evaluated using power regulation characteristics, actual efficiency vs. duty cycle and input power vs. actual efficiency characteristics. Their operating performance compared with some conventional soft switching high-frequency inverters for IH appliances is discussed on the basis of simulation and experimental results. The practical effectiveness of the newly proposed soft switching PWM SEPP series load resonant inverter is verified from an application point of view as being suitable for consumer high-frequency IH appliances.

A Voltage-Lift DC-DC Converter with Large Conversion Ratio

  • Kim, Ho-Yeon;Moon, Eun-A;Lee, Yong-Mi;Choi, Youn-ok
    • Journal of IKEEE
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    • v.23 no.3
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    • pp.1054-1060
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    • 2019
  • A extension of the high boost voltage-lift DC-DC converter with large conversion ratio has been proposed in this paper. The proposed extension is combined the switched-inductor cell (SL-cell) and modular voltage cell (MV-cell). The proposed structure can achieve the large voltage conversion without high duty-cycle and the low voltage of the components. Moreover, the PID controller for novel SL-MV voltage-lift DC-DC converter also introduces. This technique a good-performance output voltage can kept constant with an good transient performance when the output load is suddenly changed. In order to prove the theoretical analysis, the experimental setup has been built for the DC load of $150[{\Omega}]$ and $300[{\Omega}]$. In addition, the transient of output voltage has been tested to determine the controller. Experimental results validate the effectiveness of the theoretical analysis proving the satisfactory converter performance.

Novel Single Switch DC-DC Converter for High Step-Up Conversion Ratio

  • Hu, Xuefeng;Gao, Benbao;Huang, Yuanyuan;Chen, Hao
    • Journal of Power Electronics
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    • v.18 no.3
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    • pp.662-671
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    • 2018
  • This paper presents a new structure for a step up dc-dc converter, which has several advantageous features. Firstly, the input dc source and the clamped capacitor are connected in series to transfer energy to the load through dual voltage multiplier cells. Therefore, the proposed converter can produce a very high voltage and a high conversion efficiency. Secondly, a double voltage clamped circuit is introduced to the primary side of the coupled inductor. The energy of the leakage inductance of the coupled inductor is recycled and the inrush current problem of the clamped circuits can be shared equally by two synchronous clamped capacitors. Therefore, the voltage spike of the switch tube is solved and the current stress of the diode is reduced. Thirdly, dual voltage multiplier cells can absorb the leakage inductance energy of the secondary side of the coupled inductor to obtain a higher efficiency. Fourthly, the active switch turns on at almost zero current and the reverse-recovery problem of the diodes is alleviated due to the leakage inductance, which further improves the conversion efficiency. The operating principles and a steady-state analysis of the continuous, discontinuous and boundary conduction modes are discussed in detail. Finally, the validity of this topology is confirmed by experimental results.

A New Z-Source Inverter Topology with High Voltage Boost Ability

  • Trinh, Quoc-Nam;Lee, Hong-Hee
    • Journal of Electrical Engineering and Technology
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    • v.7 no.5
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    • pp.714-723
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    • 2012
  • A new Z-source inverter (ZSI) topology is developed to improve voltage boost ability. The proposed topology is modified from the switched inductor topology by adding some more inductors and diodes into inductor branch to the conventional Z-source network. The modulation methods developed for the conventional ZSI can be easily utilized in the proposed ZSI. The proposed ZSI has an ability to obtain a higher voltage boost ratio compared with the conventional ZSI under the same shoot-through duty ratio. Since a smaller shoot-through duty ratio is required for high voltage boost, the proposed ZSI is able to reduce the voltage stress on Z-source capacitor and inverter-bridge. Theoretical analysis and operating principle of the proposed topology are explicitly described. In addition, the design guideline of the proposed Z-source network as well as the PWM control method to achieve the desired voltage boost factor is also analyzed in detail. The improved performances are validated by both simulation and experiment.

Two-Inductor Non-Isolated DC-DC Converter with High Step-Up Voltage Gain

  • Lee, Sze Sing;Chu, Bing;Lim, Chee Shen;Lee, Kyo-Beum
    • Journal of Power Electronics
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    • v.19 no.5
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    • pp.1069-1073
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    • 2019
  • In this paper, an alternative non-isolated DC-DC converter with a high voltage boosting capability is proposed. Two inductors are used and one of them has its flux linkage increases during its charging period to achieve a high step-up voltage gain. Among the three integrated capacitors, one portrays the partial characteristic of the switched-capacitor technique, while the other two are connected in series across the load. With the two switches controlled using the same duty cycle, the proposed topology demonstrates the merits of a higher and wider range of step-up voltage gain when compared with recent topologies. In addition, a reduction in loss is induced and a higher efficiency is ensured with all the voltage stresses constrained within the output voltage. Operation of the proposed converter is analyzed and validated through experimental results obtained with a prototype.

A New Soft-Switching Three-Level Flying Capacitor Converter (새로운 소프트스위칭 3레벨 Flying Capacitor 컨버터)

  • Kim, Jae-Hoon;Kim, Sun-Ju;Choi, Se-Wan
    • The Transactions of the Korean Institute of Power Electronics
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    • v.25 no.6
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    • pp.484-489
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    • 2020
  • This study proposes a new soft-switching three-level flying capacitor converter with low filter inductance. The proposed converter can achieve zero voltage switching (ZVS) turn-on of all switches by using auxiliary components La and Ca. It can also reduce filter inductance because the applied voltage of the filter inductor is decreased by using the flying capacitor. Furthermore, filter inductance can be reduced because the operating frequency of the filter inductor is doubled by the phase shifting between switches S3 and S4. The operation principle, design of passive components for ZVS turn-on, interleaving effects, and comparison of different topologies are presented. The experimental waveforms of a 1 kW two-phase interleaved converter prototype are provided to verify the validity of the proposed converter.

Sensorless Fuzzy MPPT Control for a Small-scale Wind Power Generation System with a Switched-mode Rectifier (SMR 회로를 이용한 소형풍력발전 시스템의 센서리스 퍼지 MPPT제어)

  • Lee, Joon-Min;Park, Min-Gi;Kim, Young-Seok
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.63 no.7
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    • pp.916-923
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    • 2014
  • This paper proposes a low-cost switched-mode rectifier (SMR) for a small-scale wind turbine with a permanent magnet synchronous generator (PMSG) system. Also, a sensorless Fuzzy MPPT control is realized by the proposed system. In the PMSG system with the SMR, the synchronous impedance can be replaced as the input inductor of a boost converter. Moreover, the sensorless MPPT control using the Fuzzy technique is carried out by the duty-ratio regulation of the SMR. The relation between the generating power and the duty-ratio is ruled by the chain rule. The wind turbine model is implemented by the squirrel cage induction motor and generated the variable torque when the generator speed is varied. To verify the performance of the proposed system, simulation and experimental results are executed.