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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%.
Jung-Juu Park,Yeena Shin,Jeong-Hoon Oh,Chan-Hwa Chung,Yong-Jung Huh,함승주 한국공업화학회 2009 Journal of Industrial and Engineering Chemistry Vol.15 No.5
A fully integrated micro-channel fuel processor system consisting of vaporizer, steam reformer, heat exchanger and preferential CO oxidation (PROX) was developed using low temperature co-fired ceramic (LTCC). To fabricate a compact all-in-one system, each substrate was stacked to build a multilayered type fuel processor. A CuO/ZnO/Al2O3 catalyst and Pt-based catalyst prepared by wet impregnation were deposited inside the micro-channel of steam reformer and PROX, respectively. The performance of the fully integrated micro-channel reformer wasmeasured at various conditions such as the ratio of the feed flow rate, the ratio of H2O/CH3OH and the operating temperature of the reactor. In parallel with the experiments, 3-D fluid dynamics simulation (Fluent) was conducted to verify the micro-reformer performance. The fully integrated micro-channel reformer has the dimensions of W: 130 mm × D: 50 mm × H: 3 mm. The fuel processor produced the gas composition of 71% H2 and 25% CO2, and more than 93% of methanol conversion was achieved at 300 8C and 2 ㎝3/h of the feed flow rate when CO concentration was maintained below 100 ppm by PROX.
브레이크용 모터의 축 방향 하중에 따른 기계적 손실을 고려한 특성 분석
원태준(Tae-Juu Weon),정재식(Jae-Sik Jung),박현진(Hyun-Jin Park),홍정표(Jung-Pyo Hong) 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6
This paper presents characteristic analysis of surface permanent magnet synchronous motor(SPMSM) considering mechanical loss according to rotor axial load by oil pressure in brake system. If rotor is forced in axial direction, mechanical loss increases. Mechanical loss is one of major components which affect on efficiency. To consider mechanical loss, no load loss is measured at axial load condition. Mechanical loss is calculated by subtracting core loss from no load loss. Mechanical loss is increased as rotor axis is forced and rotates more quickly. Motor characteristic comparison between model with axial load and model without axial load is done. In case of model with axial load, motor performance decreases compared to model without axial load. In conclusion, Mechanical loss by axial load reduces torque and efficiency in high speed region.
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.
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.
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%.
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.