Abstract: A method of identifying defects in crystals includes the following steps. A silicon carbide crystal to be identified for defects is sliced to obtain a test piece. An etching process is performed on the test piece. Etching conditions of the etching process includes the following. An etchant including potassium hydroxide is used, and etching is performed at a temperature of 400° C. to 550° C. in an environment where dry air or oxygen is introduced, so as to form etching pits of threading edge dislocations (TED) and threading screw dislocations (TSD) in the test piece. After the etching process is performed, a diameter ratio (TED/TSD) of the etching pits of the threading edge dislocations (TED) and the threading screw dislocations (TSD) observed by an optical microscope in the test piece is in a range of 0.2 to 0.5.

Abstract: A modular AC/DC power conversion module for power sources and loads and a method of driving the same is provided. When an AC/DC converter is electrically coupled to an external power source, a microprocessor is electrically energized by a buck auxiliary circuit, under control of the microprocessor, a DC/DC converter is activated for a certain time period, and then, the AC/DC converter is activated. Thereafter, an output voltage of the AC/DC converter is boosted, and an output voltage of the DC/DC converter is boosted accordingly. Power elements in the downstream side DC/DC converter are activated first, and then power elements in the upstream side AC/DC converter are activated, thereby an inrush current is suppressed. Once the external power source is connected, the buck auxiliary circuit will automatically reduce a voltage of the power input to activate the module. It realizes that the module will autonomously operate after being electrically energized.

Abstract: A semiconductor device includes a substrate having fins and trenches in between the fins, a plurality of insulators, a first metal layer, an insulating layer, a second metal layer and an interlayer dielectric. The insulators are disposed within the trenches of the substrate. The first metal layer is disposed on the plurality of insulators and across the fins. The insulating layer is disposed on the first metal layer over the plurality of insulators and across the fins. The second metal layer is disposed on the insulating layer over the plurality of insulators and across the fins. The interlayer dielectric is disposed on the insulators and covering the first metal layer, the insulating layer and the second metal layer.

Abstract: The present invention relates to an AC/DC power conversion module and a method of driving the same. When an AC/DC converter is electrically coupled to an external power source, a microprocessor is electrically energized by a buck auxiliary circuit, under control of the microprocessor, a DC/DC converter is activated for a certain time period, and then, the AC/DC converter is activated. Thereafter, an output voltage of the AC/DC converter is boosted, and an output voltage of the DC/DC converter is boosted accordingly. Power elements in the downstream side DC/DC converter are activated first, and then power elements in the upstream side AC/DC converter are activated, thereby an inrush current is suppressed. Once the external power source is connected, the buck auxiliary circuit will automatically reduce a voltage of the power input to activate the module. It realizes that the module will autonomously operate after being electrically energized.

Abstract: A battery charging/discharging system is provided. This system includes a recycling cable and plural charging/discharging controllers. Each of the charging/discharging controllers is corresponding to a battery. When the battery is in a discharging mode, a discharging current outputted from the battery flows to the recycling cable via the charging/discharging controller. When the battery charging/discharging system is operated, the recycling cable has a recycling voltage equal to a DC voltage.