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An Interleaved Five-level Boost Converter with Voltage-Balance Control
Chen, Jianfei,Hou, Shiying,Deng, Fujin,Chen, Zhe,Li, Jian The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.5
This paper proposes an interleaved five-level boost converter based on a switched-capacitor network. The operating principle of the converter under the CCM mode is analyzed. A high voltage gain, low component stress, small input current ripple, and self-balancing function for the capacitor voltages in the switched-capacitor networks are achieved. In addition, a three-loop control strategy including an outer voltage loop, an inner current loop and a voltage-balance loop has been researched to achieve good performances and voltage-balance effect. An experimental study has been done to verify the correctness and feasibility of the proposed converter and control strategy.
System Simulation Modeling for Near-field Millimeter Wave Synthetic Aperture Imaging Radiometer
Jianfei Chen,Yuehua Li,Jianqiao Wang,Yuanjiang Li 보안공학연구지원센터(IJSIP) 2014 International Journal of Signal Processing, Image Vol.7 No.6
Due to the fact that theoretical analysis and instrument construction for antenna array of synthetic aperture imaging radiometer (SAIR) are both complicated, and designers usually hope to predict the imaging effect and analysis the influence of relevant parameters of SAIR before the system design. The imaging simulation is a very useful method in the system design of SAIR. This paper is devoted to establishing an accurate imaging model for simulating the process of near-field millimeter wave SAIR. In this model, the target radiation signals and received signals of receivers are represented by the accurate signals in the time domain, which improves the efficiency of this simulation model significantly. The visibility function is collected by the cross-correlation between I/Q signals of the antenna pairs just as the imaging process of the practical SAIR. Some characteristics (such as the coherence between targets, the resolution and no-aliasing FOV of SAIR and so on) are verified by the corresponding 1D and 2D simulation experiments, and the effectiveness of this imaging model is also tested by these simulation experiments. The simulation experiment results show that this model is an efficient, accurate imaging simulation model, and can be employed in the system design of near-field millimeter wave SAIR.
Single-Phase Step-Up Five-Level Inverter with Phase-Shifted Pulse Width Modulation
Jianfei Chen,Caisheng Wang,Jian Li 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.1
A single-phase step-up five-level inverter topology with a new phase-shifted pulse width modulation (PS-PWM) strategy isproposed in this paper. When compared with conventional single-phase five-level inverter topologies, the proposed topology canrealize multilevel inversion with a double step-up ratio, a reduced number of switching devices and self-balanced capacitorvoltages. When compared with the conventional PS-PWM strategy, the new PS-PWM strategy can be implemented with onecarrier reduced, which makes it much easier to implement in a digital signal processor (DSP) system. Experimental results havebeen presented to verify the effectiveness of the proposed inverter and the PS-PWM strategy.
An Interleaved Five-level Boost Converter with Voltage-Balance Control
Jianfei Chen,Shiying Hou,Fujin Deng,Zhe Chen,Jian Li 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.5
This paper proposes an interleaved five-level boost converter based on a switched-capacitor network. The operating principle of the converter under the CCM mode is analyzed. A high voltage gain, low component stress, small input current ripple, and self-balancing function for the capacitor voltages in the switched-capacitor networks are achieved. In addition, a three-loop control strategy including an outer voltage loop, an inner current loop and a voltage-balance loop has been researched to achieve good performances and voltage-balance effect. An experimental study has been done to verify the correctness and feasibility of the proposed converter and control strategy.
Non-isolated input-series-output-parallel three-level buck converter
Chen, Jianfei,Duan, Chen,Wang, Caisheng The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.1
This paper proposes a non-isolated input-series-output-parallel (ISOP) three-level buck converter. A theoretical analysis indicates that it has a large step-down ratio and low component voltage stress with the input and output terminals sharing the same ground. An automatic current-balancing mechanism is revealed, and it indicates that the parasitic parameters and inductance variations influence the automatic current-balancing effect. Thus, current-balance control is necessary. Considering that the proposed topology has an ISOP configuration, two voltage-balance control strategies are proposed to realize input capacitor voltage balancing and output inductor current balancing. One is implemented based on a two-loop configuration with an output voltage loop and a voltage-balance loop. The other is developed based on a three-loop configuration by adding one inner current loop on the two-loop configuration. Finally, experimental results have been given to verify both the proposed converter and voltage-balance control.
Single-Phase Step-Up Five-Level Inverter with Phase-Shifted Pulse Width Modulation
Chen, Jianfei,Wang, Caisheng,Li, Jian The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.1
A single-phase step-up five-level inverter topology with a new phase-shifted pulse width modulation (PS-PWM) strategy is proposed in this paper. When compared with conventional single-phase five-level inverter topologies, the proposed topology can realize multilevel inversion with a double step-up ratio, a reduced number of switching devices and self-balanced capacitor voltages. When compared with the conventional PS-PWM strategy, the new PS-PWM strategy can be implemented with one carrier reduced, which makes it much easier to implement in a digital signal processor (DSP) system. Experimental results have been presented to verify the effectiveness of the proposed inverter and the PS-PWM strategy.
A New Interleaved Double-Input Three-Level Boost Converter
Chen, Jianfei,Hou, Shiying,Sun, Tao,Deng, Fujin,Chen, Zhe The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.3
This paper proposes a new interleaved double-input three-level Boost (DITLB) converter, which is composed of two boost converters indirectly in series. Thus, a high voltage gain, together with a low component stress and a small input current ripple due to the interleaved control scheme, is achieved. The operating principle of the DITLB converter under the individual supplying power (ISP) and simultaneous supplying power (SSP) mode is analyzed. In addition, closed-loop control strategies composed of a voltage-current loop and a voltage-balance loop, have been researched to make the converter operate steadily and to alleviate the neutral-point imbalance issue. Experimental results verify correctness and feasibility of the proposed topology and control strategies.
A New Interleaved Double-Input Three-Level Boost Converter
Jianfei Chen,Shiying Hou,Tao Sun,Fujin Deng,Zhe Chen 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.3
This paper proposes a new interleaved double-input three-level Boost (DITLB) converter, which is composed of two boost converters indirectly in series. Thus, a high voltage gain, together with a low component stress and a small input current ripple due to the interleaved control scheme, is achieved. The operating principle of the DITLB converter under the individual supplying power (ISP) and simultaneous supplying power (SSP) mode is analyzed. In addition, closed-loop control strategies composed of a voltage-current loop and a voltage-balance loop, have been researched to make the converter operate steadily and to alleviate the neutral-point imbalance issue. Experimental results verify correctness and feasibility of the proposed topology and control strategies.
Jianfei Zhu,Xiaomei Chen,Tingting Huang,Dongling Tian,Ruiping Gao 한국식품과학회 2023 Food Science and Biotechnology Vol.32 No.2
In this paper, chitosan/ethyl-vanillin (CS-EV) Schiff-base edible films with CS and EV at different concentrations and ratios were successfully prepared. The optical barrier properties, water contact angle, mechanical performance, water vapor transmission, antioxidant properties, thermal properties, and morphological structure of the films were compared. The results suggested that the tensile strength (TS) attained a maximum value of 64.63 MPa at a concentration of 4% EV. Moreover, water diffusion was prevented through the compact structure of the CS-EV edible film. Additionally, the two sides of the CS-EV film show different textures due to their different hydrophilicity/hydrophobicity. In particular, the films of CS possessed superior thermal stability, while those of CS-EV exhibited higher antioxidant activity.
Adsorption of mixed polycyclic aromatic hydrocarbons in surfactant solutions by activated carbon
Jianfei Liu,Jiajun Chen,Lin Jiang,Xue Yin 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.2
The adsorption behavior of three polycyclic aromatic hydrocarbons (PAH) in TX100 solution by activatedcarbon was studied aiming at surfactant recovery. Adsorption experiments were conducted in batch andcolumn models. The adsorption data fitted well with the Langmuir isotherm model, Dubinin–Radushkevich isotherm models and pseudo-second-order kinetics model. Regarding column adsorption,the exhausting time of TX100 was shorter than the breakthrough time of PAH in the fixed AC column. This finding indicates the feasibility of reusing surfactants from soil-washing solutions. The total costscan reduce about $ 0.57 per 10 L washing solution with AC adsorption.