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A kind of LLC resonant converter with voltage-doubling rectifier technology is studied in this paper. The converter has not only a general LLC half-bridge resonant converter being easy to obtain ZVS for primary side switches and ZCS for secondary side diodes, a high efficiency of this topology, but also advantages that the transformer structure is simple in which one winding is involved on its secondary...
Drop test for solder joint reliability is critical for all area arrays and perimeter-leaded surface mount semiconductor devices typically used in handheld electronic products. Joint Electron Device Engineering Council, JEDEC, published a new test standard, JESD22-B111A, to be the revision of the JESD22-B111 for board level drop test in November, 2016. The major differences between JESD22-B111 and...
In this paper, a high gain boost converter based on the voltage-lift technique is proposed. The converter is composed of basic quasi-Z-source cell and a voltage-lift cell which contains one capacitor, two inductors and diodes. Contrasted with the traditional quasi-Z-source DC/DC converter, a relatively high voltage conversion and the reduction of the input current ripple can be achieved with the presented...
Traditional Z-source inverter can boost or buck voltage for its unique impedance network, but also has its own drawbacks, such as input current is not continuous, boost capacity is limited, the capacitor voltage stress is large and etc. In order to overcome the shortcomings of the traditional Z-source inverter, a series of Z-source inverters are proposed. In this paper, the topology of three kinds...
This paper presents a compensation method for the stress dependence of flexible integrated capacitive pressure sensors. Without compensation the differentiation between changes in the sensor signal due to pressure or bending cannot be made [1]. To achieve this requirement a complex back side structuring of thinned capacitive pressure sensors is conducted in preparation for simulations and pressure...
Composites are widely used in aviation, aerospace and other fields because of their high specific strength, high specific stiffness and easy molding. However, in the process of using the concentrated stress, heavy shocks may form different degrees of damage. Especially, the internal delamination will reduce the stability and safety of the structure. Based on the analysis of damage location and damage...
A novel quadratic buck-boost DC/DC converter is presented in this study. The proposed converter utilizes only one active switch and can step-up/down the input voltage, while the existing single switch quadratic buck/boost converters can only work in step-up or step-down mode. First, the proposed converter is analyzed in steady-state. Then, its performance is validated using simulations in MATLAB/Simulink...
Silver tin oxide (Ag/SnO2) contact materials are widely used in contactor applications. A general trend in this application field is the steadily ongoing miniaturization of switching devices, resulting in growing energy densities to be handled by the contact system. The higher arcing energy densities in such new designs are inducing increased thermo-mechanical stresses in the contact system. As these...
This work presents a hydrogenated amorphous silicon (a-Si:H) gate driver circuit for active-matrix liquid crystal displays (AMLCDs) equipped with in-cell touch structure. The display operation can be paused several times in a frame with the horizontal blank driving method to increase the touch reporting rate. Moreover, the pre-charge structure is utilized to reduce the threshold voltage (Vth) shift...
Nowadays, diving is done for a variety of purposes. One type of diving activity is scuba diving. In the process, time and scuba diving area are limited by the availability of gas for breathing. This research focused on the design of single passenger underwater vehicle frame. Frame is a major component of the underwater vehicle functioning as a holder of the load and a place to put all the components...
Output voltage of renewable energy resources, such as fuel and solar cells, varies widely with load and environmental condition, so a DC-DC converter should be suitable for wide input-voltage range application and be with low input ripple current. An integrated boost three-phase half-bridge converter is proposed. The boost and three-phase half-bridge converters are integrated to reduce number of switches...
One type of robots that is interesting to develop is climbing robot. In order to create a robot that can move vertically, observation and data gathering on caterpillar's walking movement are needed. FEA simulation was conducted to attain stress distribution pattern of caterpillar's legs. A simulation was conducted to the climbing robot design to get the stress distribution pattern of each of its legs...
Single-stage buck-boost gird-connected inverter is widely used in distributed generation systems because of low cost and high efficiency. However, shoot-through problem exists, so reliability of the system is reduced. In addition, output voltage of renewable energy resources varies widely with load and environmental condition, so voltage stress of switches is high in wide input-voltage range application...
Active debris removal and defunct satellites mitigation is one of current hot spots in space research. Based on the deployment process, a new mixed space web is proposed in present paper. Firstly, the Vector Form Intrinsic Finite Element Method and “Kelvin-Voigt” viscoelastic constitution relation are adopted to establish the dynamic model of space web. Then the reliability of the simulation model...
This paper proposed a physical model of electron trapping/detrapping in electrically stressed oxide. The new model is based on both inelastic multi-phonon trap-assisted tunneling and thermal emission, and the capture effect of oxide bulk traps is considered as well. The dynamic procedure of traps capture and emission of electrons are established. Finally, the filling state of all the oxide traps at...
The traditional metal plate bending process is difficult to meet the requirements of modern shipbuilding industry, and this paper adopts a new incremental bending process for manufacturing metal plate based on minimum energy principle and dieless forming. This process uses a set of punches and a series of highly adjustable and head rotatable supports to complete the punching process by changing the...
In this paper, the BGA solder joint is considered as the object of study. A fatigue life prediction model based on energy conservation law is constructed by reasonable assumptions. Energy-based life prediction model can avoid the analysis of various complex damage mechanisms in fatigue process, and only use energy as a measure. The mechanical response of BGA solder joint under temperature cycling...
In recent years, the Z-bending process was rarely investigated, especially for the asymmetrical Z-shape bending process. This causes the lacks of understanding on bending mechanism and spring-back characteristics and results in the difficulty in die design and process control for the spring-back characteristics. In the present research, therefore, the wiping asymmetrical Z-bending process was examined...
In this paper, the two Negative Bias Temperature Instability (NBTI) framework components are divided with interface trap generation (Δ Vit) and hole trapping in pre-existing defects (Δ Vht). The threshold voltage shift (ΔVT) contribution is verified by two divided components and studied independently. The impact of inter layer (IL) thickness is simulated under NBTI stress using technology computer-aided...
This paper simulated the dynamic changes of the Instantaneous Water Use Efficiency (WUEI) of leaves by constructing a coupled model related to net photosynthetic rate (Pn) and transpiration speed (Tr) of apple trees under different moisture conditions. Model parameters were determined through the potted apple tree experiment under gradual drought conditions (Malus domestica Borkh. cv. Fuji). Numerical...
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