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This paper explores the frequency instability mechanism in modern power electronics-based power systems. It is revealed that the lack of damping and inertia together with the slow response of the frequency regulator should be responsible for frequency instability issues. As a result, three possible solutions targeting at damping enhancement, inertia emulation, and response acceleration are employed...
Reducing parasitic inductances are critical for improving efficiency and safety in Gallium Nitride (GaN) based DC-DC Converter. This paper aims at reducing the driver loop inductance and power loop inductance by optimizing the PCB layout. Firstly, this paper compares three different kinds of driver loop layouts by Maxwell 3D simulation. The results show that the driver loop inductances of single-layer...
An analytical model is proposed in this paper to calculate the switching loss of low voltage enhancement mode Gallium Nitride high electron mobility transistors (eGaN HEMTs). The switching process is illustrated in detail. The switching loss is obtained by solving the equivalent circuits during the switching transition. A good agreement is shown between the analytical model and Spice simulation results...
Electronic commerce is an unconventional market economy that is based on the sophisticated Internet technology. Great changes have taken place because the electronic business brings about profound impacts on a country's taxation system, taxation policy and taxation methods as well. China's ecommerce is still at the initial stage, the analysis of the status and function of electronic business in China's...
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