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RISS 인기검색어
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- 저자 : Tsorng-Juu (검색결과 6 건)
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A Single Switch Boost-Flyback DC-DC Converter Integrated with Switched-Capacitor Cell
Tsorng-Juu Liang,Shih-Ming Chen,Lung-Sheng Yang,Jiann-Fuh Chen,Adrian Ioinovici 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
Without extreme duty ratio or complexity of circuits, by employing coupled-inductor and switched-capacitor cell achieved high voltage conversion ratio with a single switch is proposed in this paper. Coupled-inductor transfer source energy to secondary side through entire switching period, the leakage energy of coupled inductor is efficiently recycled; the inrush current problem on switched capacitors was restrained by leakage inductor of coupled-inductor; all the above features account to the high efficiency performance. The operating principles and steady-state analyses of continuous-conduction mode and boundary-conduction mode are discussed in detail. To verify the performance of the proposed converter, a 200 W/400 V prototype sample is implemented, the maximum efficiency is up to 96.3%; and full load efficiency is 92.4%.
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Yu-Kun Chen,Tsorng-Juu Liang,Wei-Chia Wu 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
In this paper, a photovoltaic (PV) girdconnected micro-inverter controlled by power factor correction (PFC) controller is implemented. The PFC controller is adopted to control the inverter output current sinusoidally. Besides, the maximum power point tracking control circuit can get the maximum power form PV modules. The duality between the PFC circuit and the inverter circuit is presented first. Then, the PFC design rules is applied in the inverter circuit. However, the flyback inverter controlled by boundary conduction mode (BCM) PFC IC will cause a high third harmonic component from the analysis. Hence, the third harmonic injection method is estimated and analyzed to improve the output current total harmonic distortion. Finally, a 300W grid-connected flyback micro-inverter with BCM control based on L6561 PFC controller is implemented to verify the feasibility. Input voltage is 20V to 40V and the peak power is 300 W from PV simulator, and the output voltage is 220Vac/60Hz. The highest efficiency of the micro-inverter is 92.8%.
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Primary-Side Control for Flyback Converter with Wide Range Operation
Bin-Kun Huang,Tsorng-Juu Liang,Wei-Jing Tseng,Kai-Hui Chen,Qing-Mu Chen 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
Most of current primary side regulation (PSR) control methods are implemented in either discontinuous conduction mode (DCM) or continuous conduction mode (CCM). Because of the difficulty in sensing the output voltage, no algorithm is suitable for both DCM and CCM, and the power range of the system is limited. The proposed controller is suitable for both DCM and CCM with wide power range operation. The “TSMC 0.25 μm CMOS high voltage mixed signal process” is adopted to implement the proposed IC. A flyback converter with 400 V input and 20 V/150 W output is built to verify the feasibility of proposed control IC.
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Voltage Clamping Balance for Charging/Discharging Battery Module
Yi-Yuan Chung,Tsorng-Juu Liang,Wei-Jing Tseng,Jwo-Hann Liu 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper proposes a voltage clamping balance (VCB) method applied with battery power module (BPM) system. The VCB method, which indicates that battery balance is activated after the battery voltage reached its rated value, can save the cost of battery state of charge (SOC) estimation and increases system reliability while keeping the battery voltage in safe operating region. Otherwise, a VCB discharging experimental result shows that the proposed method can release more charge from battery than conventional discharging method in this paper. The proposed system composed of several BPMs and a system control circuit can provide energy as a DC voltage source in discharge mode, and can be charged by an external DC voltage source in charge mode. Meanwhile, the characteristics of BPM system such as high flexibility and capability of hot-swapping can be achieved by the proposed system. Finally, a 24-V LiFePO4 BPM system prototype containing 4 BPMs with 200-W power rating for each BPM is built to verify the feasibility of the proposed VCB method and the proposed BPM system.
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Design of Control IC for Multiphase Interleaved Buck Converter with Alternate Phase-Shedding
Ji-Shiang Lee,Chun-Yu Huang,Tsorng-Juu Liang,Kai-Hui Chen 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
In this paper, a controller for a multiphase interleaved buck converter with alternate phase-shedding is realized. With phase-shedding control, the efficiency at low load condition is improved by turning-on appropriate number of phase(s), but the temperature on the active phase(s) is higher than the off phase(s) that cause the temperature unevenly distribution. To solve this problem, the alternate phase-shedding is implemented in the proposed controller. The phases take turns to provide the load current at low load condition to distribute power to each phase and share the same load as well as improve reliability. The proposed controller would implement interleaved control regardless the number of active phases. In addition, taking advantage of the application of high step-down ratio, the proposed control structure that input current is sensed to control each phase is adopted. The number of components and pins of controller can be reduced. This chip is fabricated with TSMC 0.25um CMOS high voltage mixed signal general purpose process and is tested with an input voltage of 12 V, output voltage of 1.2 V, and output power of 72 W three-phase buck converter to verify the feasibility.
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Study and Implementation of a Single Switch Cascading High Step-Up DC-DC Converter
Mao-Sheng Lin,Lung-Sheng Yang,Tsorng-Juu Liang 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
In this paper, a novel high step-up DC-DC converter is proposed. The proposed converter is constructed of a boost converter with a coupled inductor technique to achieve high step-up voltage gain by a single switch. The front semi-stage is a boost converter and the rear semi-stage utilizes the coupled inductor and clamp circuit to reduce the voltage stress on the power switch. Thus, the low voltage-rating switch with low conduction resistance can be used to improve the system efficiency. The operating principle and steady-state analysis of the proposed converter are discussed in detail. Finally, a laboratory prototype circuit of the proposed converter with 24 V input voltage and 400 V/400 W output is implemented to verify the performance of the proposed converter.
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