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Effect of channel diameter on magneto-thermal co.version ratio and co.sistency of each strand in a multi-strand induction heating tundish

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Journal of Iron and Steel Research International 2023年第6期30卷 1199-1210页

作者： Pu Wang Hong Xiao Xi-qing Chen Hai-yan Tang Jia-quan Zhang School of Metallurgical and Eco.ogical Engineering University of Science and Technology BeijingBeijing 100083China Magnetoelectric Research Institute Hunan Zhongke Electric Co.Ltd.Yueyang 414000HunanChina

The electromagnetic,flow,heat transfer and inclusions motion model of the channel-type induction heating(IH)tundish was established,and the effect of the channel diameter on the metallurgical behavior of the tundish was *** results show that the magnetic field in the channel of the IH tundish tends to co.centrate on the surface layer and the side near the *** the channel diameter is increased from 100 to 180 mm,the maximum value of magnetic flux density in the channel decreases by 0.125 T,and the maximum value of electromagnetic force decreases by 11.83×10^(5) N m^(-3);however,the off-center distance of magnetic field increases by 9.4 mm,and the Joule heat in the channel decreases by 1004 kW,which leads to the reduction in temperature rising rate of the tundish from 1.41 to 0.59 K min^(-1).When the channel diameter is 100,140 and 180 mm,the maximum velocity at the channel exit before heating is 0.59,0.29 and 0.18 m s^(-1),and after heating for 1800 s,it is 1.52,1.12 and 0.92 m s^(-1),*** addition,the total inclusions escape ratio after heating for 1800 s with a channel diameter of 140 mm can be reduced by 12.39% co.pared to that before heating,and the maximum difference of escape ratios for each strand is only 4.51% and 5.32% before heating and after heating for 1800 s,*** with the channel diameters of 100 and 180 mm,the channel diameter of 140 mm is more favorable to improve the metallurgical effect of the IH tundish.

关键词： Induction heating tundish Channel diameter Joule heat Temperature rising rate Inclusion escape ratio

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New electromagnetic variable flow device for slab co.tinuous casting mold: mechanical design and magnetic field analysis

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Journal of Iron and Steel Research International 2024年第11期31卷 2710-2726页

作者： Xi-qing Chen Pu Wang Shun Liu Hong Xiao Lin-lin Lei Jia-quan Zhang School of Metallurgical and Eco.ogical Engineering University of Science and Technology BeijingBeijing100083China hunan zhongke electric co. Ltd.Yueyang414000HunanChina MCC Capital Engineering&Research Inco.poration Limited Beijing100176China

Obtaining a reasonable mold flow field for casting slabs with different sections is challenging by solely modifying the nozzle structure and co.tinuous casting process. Research was co.ducted on small-sectioned (1000 mm × 220 mm) and large-sectioned (3250 mm × 220 mm) slab co.tinuous casting molds with a fixed nozzle form (co.cave bottom nozzle, side port inclination angle of 0°). A three-dimensional electromagnetic model is established to analyze the current frequency, installation position, and rotation angle under the active deceleration mode and acceleration mode. The results indicate that, regardless of the deceleration mode for small-sectioned slabs or the acceleration mode for large-sectioned slabs, the magnetic flux density in the mold decreases with increasing current frequency. However, the maximum electromagnetic force initially increases and then decreases, suggesting that both electromagnetic modes have the same optimal current frequency (3 Hz). The optimal mechanical design parameters for the deceleration mode of electromagnetic variable flow device (EM-VFD) with the small-sectioned slab are as follows: installation position Z = 115 mm and rotation angle of 15°, ensuring that the maximum electromagnetic force is applied to the nozzle jet area. For the acceleration mode of the large-sectioned slab EM-VFD, the optimal mechanical design parameters are as follows: Z = 115 mm and rotation angle of 10°, ensuring that the maximum electromagnetic force is applied to 1/4 and 3/4 areas of the wide face. These findings indicate that the new electromagnetic variable flow device, which can actively adjust the flow rate and angle of the steel even under given working co.ditions, provides the possibility for reasonable co.trol of the mold’s flow field.

关键词： Electromagnetic variable flow device Deceleration mode Acceleration mode Current frequency Installation position Rotation angle

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A single-to-differential low-noise amplifier with low differential output imbalance

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Journal of Semico.ductors 2012年第3期33卷 60-64页

作者：段炼黄伟马成炎何晓丰金玉花叶甜春 Institute of Microelectronics Chinese Academy of Sciences Hangzhou zhongke Microelectronics co. Ltd.

This paper presents a single-ended input differential output low-noise amplifier intended for GPS applications. We propose a method to reduce the gain/amplitude and phase imbalance of a differential output exploiting the inductive co.pling of a transformer or center-tapped differential inductor.A detailed analysis of the theory of imbalance reduction,as well as a discussion on the principle of choosing the dimensions of a transformer,are *** LNA has been implemented using TSMC 0.18μm technology with *** on board shows a voltage gain of 24.6 dB at 1.575 GHz and a noise figure of 3.2 *** gain imbalance is below 0.2 dB and phase imbalance is less than 2 *** LNA co.sumes 5.2 mA from a 1.8 V supply.

关键词： GPS receiver single-ended input differential output balun low-noise amplifier transformer

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Dual-salt assisted synergistic synthesis of Prussian white cathode towards high-capacity and long cycle potassium ion battery

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Journal of Energy Chemistry 2023年第8期83卷 16-23,I0003页

作者： Rui Ma Zixing Wang Qingfeng Fu Wang Zhou Ying Mo Jian Tu Zhiyong Wang Peng Gao Changling Fan Jilei Liu co.lege of Materials Science and Engineering Hunan Joint International Laboratory of Advanced Materials and Technology for Clean EnergyHunan Province Key Laboratory for Advanced Carbon Materials and Applied TechnologyHunan UniversityChangsha 410082HunanChina LI-FUN Technology co.poration Limited Zhuzhou 412000HunanChina hunan zhongke Shinzoom Technology co. Ltd.Changsha 410082HunanChina

Prussian blue analogues(PBAs) are co.sidered as superior cathode materials for potassium-ion batteries(PIBs) because of their three-dimensional open framework structure,high stability,and low ***,the intrinsic lattice defects and low potassium co.tent typically results in poor rate and cycling performance,thus limited their practical *** this work,high-quality K1.64FeFe(CN)6(PW-HQ)material with less crystalline water(6.21%) and high potassium co.tent(1.64 mol^(-1)) was successfully synthesized by a novel co.recipitation method with potassium citrate(K-CA) and potassium chloride(KCl) ***,the electrode delivers a reversible capacity of 113.1 mA h g^(-1)at the current rate of 50 mA g^(-1)with~100% co.lombic ***,the electrode retained 90% reversible capacity at 500 mA g^(-1)current density after 1000 cycles,indicating only 0.01% capacity decay per ***,we have revealed that the introduction of K-CA co.trolled the chelating rate of Fe(Ⅱ) and the addition of KCl increased the K+co.tent,hence improving the capacity and stability of the asprepared *** evolution and potassium storage mechanism were further investigated by detailed ex-situ X-ray diffraction and in-situ Raman measurements,which demonstrated reversible potassiation/depotassiation behavior and negligible volume change during the electrochemical *** general,this work provides an efficient strategy to eliminate water co.tents in Prussian blue cathode and improve its electrochemical performance,which plays a key role in promoting the industrialization of potassium ion batteries.

关键词： Potassium-ionbattery High-qualityK,FeFe(CN)s Potassiumchloride Potassiumcitrate Electrochemical properties

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A sub-1-dB noise figure monolithic GNSS LNA

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Journal of Semico.ductors 2013年第9期34卷 149-153页

作者：周仁杰项勇王虹甘业兵钱敏马成炎叶甜春 Institute of Microelectronics Chinese Academy of Sciences Hangzhou zhongke Microelectronics co. Ltd. Jiaxing Lianxing Microelectronics co. Ltd.

A monolithic integrated low noise amplifier （LNA） based on a SiGe H/3T process tbr a global nawgatlon satellite system （GNSS） is presented. An optimizing strategy of taking parasitic capacities at the input node into co.sideration is adopted and a method and design equations of monolithically designing the LC load and the output impedance matching circuit are introduced. The LNA simultaneously reaches excellent noise and input/output impedance matching. The measurement results show that the LNA gives an ultra-low noise figure of 0.97 dB, a power gain of 18.6 dB and a three-order input intermodulation point of -6 dBm at the frequency of 1.575 GHz. The chip co.sumes 5.4 mW from a 1.8 V source and occupies 600 x 650 μmz die area.

关键词： LNA GNSS monolithic integrated SiGe HBT

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Robust sensor faults detection for induction motor using observer

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控制理论与应用（英文版） 2012年第4期10卷 528-532页

作者： Changfan ZHANG Yishan HUANG Rui SHAO co.lege of electrical and Information Engineering Hunan University of Technology hunan CSR Times electric Vehicle co. Ltd

Current sensor is one of the key elements in the co.trol system of induction motor. Whether the accurate measurement of variables reflecting motor operation status can be made will directly affect the co.trol effect on motor system and therefore the timely, accurate detection of sensor fault is necessary. This paper brings forward an observer- based method of residual generation and fault detection on the basis of the mathematical model of the induction motor. As whether or not the nonlinear part satisfies the Lipschitz co.ditions does not limit the observer design, the application of such an observer is expanded. Meanwhile, the co.tradiction between robust error and fault sensitivity is also settled. The co.rectness and effectiveness of such method are verified by experimental testing on the simulated fault which also casts light on engineering practice.

关键词： Induction motor Observer Sensor Fault detection Robust residual

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A RF receiver frontend for SC-UWB in a 0.18-μm CMOS process

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Journal of Semico.ductors 2012年第12期33卷 49-55页

作者： Guo Rui Zhang Haiying Institute of Microelectronics Chinese Academy of SciencesBeijing 100029China Shenyang zhongke Microelectronics co. LtdShenyang 110179China

A radio frequency （RF） receiver frontend for single-carrier ultra-wideband （SC-UWB） is presented. The front end employs direct-co.version architecture, and co.sists of a differential low noise amplifier （LNA）, a quadrature mixer, and two intermediate frequency （IF） amplifiers. The proposed LNA employs source inductively degenerated topology. First, the expression of input impedance matching bandwidth in terms of gate-source ca- pacitance, resonant frequency and target Sll is given. Then, a noise figure optimization strategy under gain and power co.straints is proposed, with co.sideration of the integrated gate inductor, the bond-wire inductance, and its variation. The LNA utilizes two stages with different resonant frequencies to acquire flat gain over the 7.1-8.1 GHz frequency band, and has two gain modes to obtain a higher receiver dynamic range. The mixer uses a double bal- anced Gilbert structure. The front end is fabricated in a TSMC 0.18-μm RF CMOS process and occupies an area of 1.43 mm2. In high and low gain modes, the measured maximum co.version gain are 42 dB and 22 dB, input 1 dB co.pression points are -40 dBm and -20 dBm, and Sll is better than -18 dB and -14.5 dB. The 3 dB IF bandwidth is more than 500 MHz. The double sideband noise figure is 4.7 dB in high gain mode. The total power co.sumption is 65 mW from a 1.8 V supply.

关键词： radio frequency receiver front end CMOS low noise amplifier inductively degenerated single-carrier ultra-wideband

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A multi-mode multi-band RF receiver front-end for a TD-SCDMA/LTE/LTE-advanced in 0.18-μm CMOS process

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Journal of Semico.ductors 2012年第9期33卷 102-107页

作者：郭瑞张海英 Institute of Microelectronics Chinese Academy of SciencesBeijing 100029China Shenyang zhongke Microelectronics co. LtdShenyang 110179China

A fully integrated multi-mode multi-band directed-co.version radio frequency （RF） receiver front-end for a TD-SCDMA/LTE/LTE-advanced is presented. The front-end employs direct-co.version design, and co.sists of two differential tunable low noise amplifiers （LNA）, a quadrature mixer, and two intermediate frequency （IF） amplifiers. The two independent tunable LNAs are used to co.er all the four frequency bands, achieving sufficient low noise and high gain performance with low power co.sumption. Switched capacitor arrays perform a resonant frequency point calibration for the LNAs. The two LNAs are co.bined at the driver stage of the mixer, which employs a folded double balanced Gilbert structure, and utilizes PMOS transistors as local oscillator （LO） switches to reduce flicker noise. The front-end has three gain modes to obtain a higher dynamic range. Frequency band selection and mode of co.figuration is realized by an on-chip serial peripheral interface （SPI） module. The front- end is fabricated in a TSMC 0.18-μm RF CMOS process and occupies an area of 1.3 mm2. The measured double- sideband （DSB） noise figure is below 3.5 dB and the co.version gain is over 43 dB at all of the frequency bands. The total current co.sumption is 31 mA from a 1.8-V supply.

关键词： receiver front-end low noise amplifier mixer multi-mode multi-band CMOS

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A novel analog/digital reco.figurable automatic gain co.trol with a novel DC offset cancellation circuit

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Journal of Semico.ductors 2011年第2期32卷 79-84页

作者：何晓丰莫太山马成炎叶甜春 Institute of Microelectronics Chinese Academy of Science Hangzhou zhongke Microelectronics co Ltd

An analog/digital reco.figurable automatic gain co.trol （AGC） circuit with a novel DC offset cancel- lation circuit for a direct-co.version receiver is presented. The AGC is analog/digital reco.figurable in order to be co.patible with different baseband chips. What＇s more, a novel DC offset cancellation （Dco.） circuit with an HPCF （high pass cutoff frequency） less than 10 kHz is proposed. The AGC is fabricated by a 0.18μm CMOS process. Under analog co.trol mode, the AGC achieves a 70 dB dynamic range with a 3 dB-bandwidth larger than 60 MHz. Under digital co.trol mode, through a 5-bit digital co.trol word, the AGC shows a 64 dB gain co.trol range by 2 dB each step with a gain error of less than 0.3 dB. The DC offset cancellation circuits can suppress the output DC offset voltage to be less than 1.5 mV, while the offset voltage of 40 mV is introduced into the input. The overall power co.sumption is less than 3.5 mA, and the die area is 800 ×300μm2.

关键词： automatic gain co.trol analog/digital reco.figurable DC offset cancellation

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A novel reco.figurable variable gain amplifier for a multi-mode multi-band receiver

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Journal of Semico.ductors 2010年第7期31卷 131-136页

作者：郑家杰莫太山马成炎殷明 Institute of Microelectronics Chinese Academy of Sciences Hangzhou zhongke Microelectronics co Ltd

This paper presents a novel approach for designing a reco.figurable variable gain amplifier（VGA） for the multi-mode multi-band receiver system RF front-end *** co.figuration,which is co.prised of gain circuits,co.trol circuit,DC offset cancellation circuit and mode switch circuit is proposed to save die area and power co.sumption with the function of multi-mode and multi-band through *** VGA is realized in 0.18μm CMOS technology with 1.8 V power supply voltage providing a gain tuning range from 5 to 87 dB when the co.trol voltage varies from 0 to 1.8 *** 3 dB bandwidth is about 80 MHz for all levels of co.trol voltage（all gains）.Also,the DC offset cancellation circuit can effectively suppress DC offset to a value of less than 40 mV at the output regardless of the *** overall power co.sumption is less than 3 mA,and die area is 705×100μm^2.

关键词： variable gain amplifier multi-mode multi-band reco.figurable

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