Abstract: A short circuit fault current limiter includes a circuit breaker, a transfer current limiting unit and a current detection unit. The current detection unit is connected to the circuit breaker in series, and the circuit breaker and the transfer current limiting unit are connected in parallel into the power system line. An output terminal of the current detection unit is connected to a control terminal of the transfer current limiting unit. The current detection unit is configured to detect a fault current flowing through a branch of the circuit breaker under a short circuit fault operating condition and trigger the corresponding trigger switch of the transfer current limiting unit to be switched on, so that the circuit breaker is disconnected and the secondary side winding of the coupling reactor is connected to the system line in series, which is capable of rapidly limiting the amplitude of the fault current and reducing impact of the fault current on the system.

Abstract: A short circuit fault current limiter includes a circuit breaker, a transfer current limiting unit and a current detection unit. The current detection unit is connected to the circuit breaker in series, and the circuit breaker and the transfer current limiting unit are connected in parallel into the power system line. An output terminal of the current detection unit is connected to a control terminal of the transfer current limiting unit. The current detection unit is configured to detect a fault current flowing through a branch of the circuit breaker under a short circuit fault operating condition and trigger the corresponding trigger switch of the transfer current limiting unit to be switched on, so that the circuit breaker is disconnected and the secondary side winding of the coupling reactor is connected to the system line in series, which is capable of rapidly limiting the amplitude of the fault current and reducing impact of the fault current on the system.

Abstract: The present invention discloses a test device and a test method for a multimedia data card and a mobile-phone multimedia data card. The test device comprises a printed circuit board (PCB), and the PCB is provided with a connecting slot module that can be split and used for connecting modules under test. The test device for a multimedia data card comprises a miniature connector, which is plugged into the connecting slot module. According to the present invention, the PCB can be tested simply by connecting the PCB tester to the miniature USB connector, and the components can be easily plugged in without need of such operations as windowing and positioning. Therefore, the test efficiency is improved, and because the cost for developing test clamps to connect these test points is saved, the test cost and the manufacturing cost get reduced.

Abstract: The present invention discloses a method to identify whether a USB or a charger is plugged into a mobile terminal and an identification device thereof. The identification device comprises a USB interface module connected with an external power supply device, an interface detection and control module, an electronic switch module, a charging switch module, an identification module and a baseband USB data transceiving module. With the method to identify whether a USB or a charger is plugged into a mobile terminal and an identification device thereof provided by the present invention, when an external power supply is plugged in, the identification device makes the terminal to preferentially enter a USB mode, while, according to the ultimately detected D-signal state, interrupt responses can be flexibly generated to accurately determine the presence of a USB or a charger. It can quickly and accurately identify the type of USB or charger plugged into the terminal.

Abstract: The present invention discloses a power supply unit and a power supply switching method for mobile terminals.

Abstract: A numerical simulation method for characterizing fluid channeling along large-aperture fractures of reservoirs relates to the field of petroleum reservoir development research and computational fluid dynamics. The conventional method can not effectively represent the rapid fluid channeling along large-aperture fractures. Aiming at solving the above technical problem, an advanced method is provided in the present invention. In the invented method, the geometric similarity and hydraulic similarity treatments of large-aperture fractures can be made simultaneously, moreover, the traditional numerical simulation software was improved to be an unstructured grid simulator. Therefore, the method of the present invention can effectively simulate the rapid fluid channeling along large-aperture fractures, consequently it can ensure the reliability of the simulation results and provide reasonable reference for the adjustment and optimization of oil field development plans.

Abstract: A numerical simulation method for characterizing fluid channeling along large-aperture fractures of reservoirs relates to the field of petroleum reservoir development research and computational fluid dynamics. The conventional method can not effectively represent the rapid fluid channeling along large-aperture fractures. Aiming at solving the above technical problem, an advanced method is provided in the present invention. In the invented method, the geometric similarity and hydraulic similarity treatments of large-aperture fractures can be made simultaneously, moreover, the traditional numerical simulation software was improved to be an unstructured grid simulator. Therefore, the method of the present invention can effectively simulate the rapid fluid channeling along large-aperture fractures, consequently it can ensure the reliability of the simulation results and provide reasonable reference for the adjustment and optimization of oil field development plans.

Abstract: The present invention discloses a test device and test method for a multimedia data card and the multimedia data card of a mobile phone, wherein, the test device includes a printed circuit board (PCB) and the PCB is equipped with a detachable connection slot module which is used for connecting with each module to be tested; the test device for the multimedia data card includes a micro-connector and one end of the micro-connector connects with the connection slot module; the other end of the micro-connector connects with a PCB tester; the related data are transmitted to the PCB tester through the connection slot module and the micro-connector. By the present invention, the PCB can be tested once the PCB tester connects with the micro-USB-connector; the plug is convenient; operations such as windowing and positioning are not needed; test efficiency is improved; and the cost of developing test fixture for connecting these test points and the cost of test and manufacture are reduced.

Abstract: The present invention discloses a power supply unit and a power supply switching method for mobile terminals.

Abstract: The present invention discloses a method to identify whether a USB or a charger is plugged into a mobile terminal and an identification device thereof. The identification device comprises a USB interface module connected with an external power supply device, an interface detection and control module, an electronic switch module, a charging switch module, an identification module and a baseband USB data transceiving module. With the method to identify whether a USB or a charger is plugged into a mobile terminal and an identification device thereof provided by the present invention, when an external power supply is plugged in, the identification device makes the terminal to preferentially enter a USB mode, while, according to the ultimately detected D?signal state, interrupt responses can be flexibly generated to accurately determine the presence of a USB or a charger. It can quickly and accurately identify the type of USB or charger plugged into the terminal.