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The contents generated from different data sources are usually non-uniform, such as long texts produced by news websites and short texts produced by social media. Uncovering topics over large-scale non-uniform texts becomes an important task for analyzing network data. However, the existing methods may fail to recognize the difference between long texts and short texts. To address this problem, we...
DC-link capacitors are usually utilized in voltage source converters to stabilize the DC-link voltage and suppress the transmission of current harmonics into the power grid. To guarantee the reliability of voltage source converters, in addition to select the DC-link capacitors with optimum capacitance, appropriate rated voltage and enough ripple current capacity, thermal design is also of great importance...
The multilevel converter is a prospective topology for both Medium Voltage and High Voltage Direct Current (HVDC) applications. In high power application, the forward topology is applied to increase the power region. In this paper, a novel forward-mode five-level inverter is presented which combines the features of the conventional multilevel converters and forward topology. The converters can transfer...
With the continuous development of high frequency inverter technology and multilevel inverter technology, all kinds of novel high frequency multilevel inverter are put forward and studied. And among them, the interleaved flyback three-level inverter (IFTLI) has a better work performance. In this paper, the control methods of single-phase IFTLI will be studied in-depth. Firstly, the instantaneous voltage...
Inherent high switching frequency ability makes silicon carbide Metal-Oxide-Semiconductor Field-Effect transistor more sensitive to the parasitics and noise in the circuit. The layout of gate driver has a crucial influence on the parasitics, hereby the propagation delay and rise/fall time of the driving signal which is among the dominant factors to determine the switching performance of power device...
DC capacitor voltage imbalance is an inherent problem limited the further development of multi-level Neutral Point Clamped (NPC). In this paper, a new hybrid control method based on Space Vector Pulse Width Modulation (SVPWM) for five-level NPC at high modulation index and high power factor is presented. By choosing appropriate switching pattern in lower modulation index sectors and collocating different...
To solve the problem of performance appraisal of SME (Small and medium-sized enterprises) s' designers, this paper proposes a design method of appraisal system combining with product data management (PDM) workflow management. Designed a performance appraisal system model based on process management; taking into account the characteristics of supporting businesses, introduced a workflow template customization...
In this paper, one kind of two-stage bidirectional AC/DC converter for battery formation is studied. And the post-stage DC/DC converter based on the full-bridge and push-pull structure is the focus of the study. Firstly, the small signal model is built for the bidirectional DC/DC converter. And then the control compensator is designed. The control method based on one kind of bidirectional switching...
The digital control power supply has been widely used by virtue of its many advantages. However, it may cause limit cycle oscillations due to quantization in the feedback loop when the switching frequency is high. This paper presents an analytical model of buck converter using state space average method and derives the equilibrium expression in steady state, and the requirement for DPWM resolution...
As mobile computing is becoming more and more popular, the security threats to mobile applications are simultaneously increasing explosively. Most malicious activities hack the user's private information, such as contact and location information, hijack the user's transactions and communications, and exploit the confidential enterprise data stored in mobile databases or in cache on mobile devices...
In this paper, a genetic algorithm based converter system design procedure is presented with the feature of speed and universal. This method can better pack a high power density power converter.
Grid-connected converters have been widely used in distributed generations. However, the resonance brought by converters in weak grid has been a great threat to system stability. Impedance-based method provides a powerful tool for stability analysis. Active damping is also widely applied to improve system stability. This paper derives the impedance model of grid-connected converter system and analyzes...
Automatic parking systems have significant effects on intelligent transport systems (ITS) and have been extensively researched. However, most existing vision-based automatic parking slot detection methods cannot obtain the desired results due to variation in light intensity or complex obstacle conditions. Besides, most previous parking slot detection methods only consider the target position occupied...
In this paper, compact power module design and evaluation method is presented for EV application. This method can help to design a high power density power converter.
In this paper, an LLC resonant converter design methodology for battery charger based on mode analysis is presented. The accuracy of DC gain curve obtained by mode analysis is much higher than that by FHA. Conduction loss and switching loss can be minimized by reasonably configuring charging trajectory on the mode distribution map. ZVS and ZCS can be realized during whole charging process. Finally,...
This paper studies the set operations on maxitive belief structures. Unlike Dempster-Shafer structures, we show that different maxitive belief structures can induce the same upper and lower possibilities. Then the operations on the set of maxitive belief structures might not be the operations on their induced upper and lower possibilities. We call those operations on maxitive belief structures which...
This paper introduces a fitness data management system based on the Android platform for the strength fitness equipment, which can display, storage and mange fitness data. The server for this system is Tomcat and the mobile terminal's operating system is Android. App installed on the terminal interact with the database through HTTP transport protocol, which enable the visual management for fitness...
This paper gives an intuitionistic interpretation of maxitive belief structure. Central to this interpretation is that we can use maxitive belief structure to convey correct information for any intuitionistic statement which is a pair of values, (L(A), D(A)), providing information on the value of a variable lying in the set A. Then we can represent an intuitionistic statement by a maxitive belief...
This paper will present the recent development of large-signal modeling cum PA design based on Dynax GaN HEMT devices. A modified Angelov model is used to model the pulse I-V data. Improved modeling results to address the trapping effect will be given together with new model parameter extraction methodology. A new Large Signal model purpose with trapping effect. Design Power Amplifier in the purpose...
In this paper, we present extensions to the floating point unit of the RISC-V ISA with different numeric precision including single precision, half precision and quarter precision. To achieve more energy efficiency transprecision feature is introduced through configurable mantissa precision, which can be used to reduce the number of iterations and thus reduce the energy consumption achieving a programmable...
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