30results about How to "Relief Concentration" patented technology

In an electric discharge device (40) performing streamer discharge from the top of a discharge electrode (41) toward an opposing electrode (42), the discharge electrode (41) with a liner or bar-like shape is placed substantially parallel to the opposing electrode (42). The structure results that the shape of the top of the discharge electrode (41) does not change even if the top wears and the distance between the discharge electrode (41) and the opposing electrode (42) also does not change. This prevents stability of streamer discharge from lowering even if the top of the discharge electrode (41) wears.

The invention provides an IGBT device and a manufacturing method thereof. The IGBT device includes: a substrate, the substrate includes opposite first main surfaces and second main surfaces, the first main surface is formed with a front structure of the IGBT device, and the IGBT device includes The active region, the transition region and the terminal region; the oxygen ion defect layer, formed in the second main surface of the transition region and the terminal region; the collector region, formed on the second main surface of the substrate; the hydrogen ion doped region, formed In the second main surface of the substrate, the oxygen ion defect layer is located in the hydrogen ion doped region, wherein the oxygen ions in the oxygen ion defect layer serve as adsorbents for hydrogen ions so as to increase the doping of hydrogen ions in the hydrogen ion doped region. impurity concentration. The present invention reduces the emission efficiency of the transition region and the terminal region when the IGBT device is turned on, and at the same time increases the recombination speed of electrons and holes in the transition region and the terminal region when the IGBT device is turned off, thereby effectively alleviating the current concentration problem existing in the transition region , Improve the reliability of the IGBT chip.

The invention provides a Cu@Sn core-shell structure high-temperature solder and its preparation method. The core-shell structure metal powder has only two elements, Sn and Cu, and has a core-shell structure of Sn-coated Cu particles. The particle size is Between 1 μm and 20 μm. The metal powder is mixed with commercially available flux to obtain solder, which can be used for welding various substrates. During the reflow process, the Sn in the outer layer of the particles can react with the Cu in the inner core to form Cu6Sn5, thereby forming a dispersed distribution in the intermetallic compound. The weld structure of copper particles can be formed above the melting point of Sn, and can serve below the melting point of Cu6Sn5 after formation, so as to achieve the purpose of low temperature connection and high temperature service. The invention has the advantages of simple process, low cost and strong practicability, and solves the problems of high pasting cost, high process temperature and long process time of power device chips at present.

The invention relates to a device for eliminating flammable gas in a closed environment. The device comprises a heat production component, a diversion shield and two fixing plates, wherein the heat production component comprises a rectangular box body and catalyzing boxes; the upper side and the lower side of the rectangular box body have an opened structure; air enters the rectangular box body through an opening in a lower bottom surface from bottom to top; bearing structures for placing the catalyzing boxes are distributed inside the rectangular box body; catalyzing balls are arranged in the catalyzing boxes; the diversion shield has an overall shield structure consisting of a diameter-changed body and a diversion body; one bottom edge of the diameter-changed body on the diversion shield is hinged with one side at the upper end of the rectangular box body, so that the whole device can be opened and closed, and the catalyzing boxes can be assembled and replaced; the side faces of the rectangular box body in both side directions of an air outlet of the diversion shield is provided with one fixing plate respectively; and the device is integrally arranged on a vertical wall surface or a fixed object through the fixing plates. The device can reliably and effectively eliminate the flammable gas in the closed space environment.