Abstract: A flyback power converter includes a power transformer, a first lossless voltage conversion circuit, a first low-dropout linear regulator and a secondary side power supply circuit. The first low-dropout linear regulator (LDO) generates a first operation voltage as power supply for being supplied to a sub-operation circuit. The secondary side power supply circuit includes a second lossless voltage conversion circuit and a second LDO. The second LDO generates a second operation voltage. The first operation voltage and the second operation voltage are shunted to a common node. When a first lossless conversion voltage is greater than a first threshold voltage, the second LDO is enabled to generate the second operation voltage to replace the first operation voltage as power supply supplied to the sub-operation circuit; wherein the second lossless conversion voltage is lower than the first lossless switching voltage.

Abstract: According to an aspect, a computer-implemented method includes accessing a profile of a user that indicates a likelihood that the user will execute each of a plurality of types of processing when training a new AI model. A runtime matrix that includes identifiers of runtime environments is accessed. The matrix also includes, for each of the runtime environments, a frequency of use of the runtime environment to train previously trained AI models using each of the plurality of types of processing. One or more of the runtime environments is selected for output to the user based at least in part on the profile of the user and the runtime matrix. Identifiers of the selected one or more of the runtime environments are output to a user interface of the user along with a suggestion to use one of the selected one or more of the runtime environments.

Abstract: A rotor of an electric motor includes a rotating shaft, a rotor core and a commutator fixed to the rotating shaft, and a first sleeve, a second sleeve and a third sleeve arranged around the rotating shaft. The first sleeve is located on a side of the rotor core away from the commutator and abuts against the rotor core, the second sleeve is located between the rotor core and the commutator, and the third sleeve is located on a side of the commutator away from the rotor core.

Abstract: A brush used to contact with a commutator, includes a brush body which includes two opposite axial end faces and a protruding portion projecting from the brush body toward the commutator. The protruding portion includes a first surface, a second surface and at least two teeth. The first surface and the second surface are respectively adjacent to the two axial end faces. Angles formed between the first surface and the second surface and corresponding adjacent axial end faces are obtuse. The teeth is located between the first surface and the second surface, and extends generally along a circumferential direction of the commutator. The ratio of a total width of the at least two teeth in an axial direction of the brush to an axial height of the brush body is in the range of 0.25-0.75. An electric motor including the brush is also provided.

Abstract: A rotor of an electric motor includes a rotating shaft, a rotor core and a commutator fixed to the rotating shaft, and a first sleeve, a second sleeve and a third sleeve arranged around the rotating shaft. The first sleeve is located on a side of the rotor core away from the commutator and abuts against the rotor core, the second sleeve is located between the rotor core and the commutator, and the third sleeve is located on a side of the commutator away from the rotor core.

Abstract: A brush used to contact with a commutator, includes a brush body which includes two opposite axial end faces and a protruding portion projecting from the brush body toward the commutator. The protruding portion includes a first surface, a second surface and at least two teeth. The first surface and the second surface are respectively adjacent to the two axial end faces. Angles formed between the first surface and the second surface and corresponding adjacent axial end faces are obtuse. The teeth is located between the first surface and the second surface, and extends generally along a circumferential direction of the commutator. The ratio of a total width of the at least two teeth in an axial direction of the brush to an axial height of the brush body is in the range of 0.25-0.75. An electric motor including the brush is also provided.

Abstract: A method for determining the completeness of an optical disc and a method for playing the optical disc are provided. The method for playing the optical disc includes: performing focusing on and tracking on the optical disc; detecting whether the optical disc contains any data if the focusing on succeeds while the tracking on fails; if the optical disc contains data, turning on a servo system to perform focusing on and tracking on to the area containing the data and determining whether a file information area contains a file system; if the file information area does not contain any file system, reading the outmost data in a video data area to locate a file allocation data table; and playing the data stored in the video data area according to the file allocation data table.

Abstract: A rotation speed control apparatus for a disk recorder is provided, which includes a buffer monitor and a rotation speed decision maker. According to the amount of data in the buffer, the buffer monitor outputs a buffer data. According to the buffer data, the rotation speed decision maker outputs a disk-rotation-speed signal. According to the disk-rotation-speed signal, the disk recording speed of an optical storage system is adjusted by the rotation speed control apparatus to avoid disk recording interruption due to lack of buffer data.

Abstract: A method for determining the completeness of an optical disc and a method for playing the optical disc are provided. The method for playing the optical disc includes: performing focusing on and tracking on the optical disc; detecting whether the optical disc contains any data if the focusing on succeeds while the tracking on fails; if the optical disc contains data, turning on a servo system to perform focusing on and tracking on to the area containing the data and determining whether a file information area contains a file system; if the file information area does not contain any file system, reading the outmost data in a video data area to locate a file allocation data table; and playing the data stored in the video data area according to the file allocation data table.

Abstract: A rotation speed control apparatus for a disk recorder is provided, which includes a buffer monitor and a rotation speed decision maker. According to the amount of data in the buffer, the buffer monitor outputs a buffer data. According to the buffer data, the rotation speed decision maker outputs a disk-rotation-speed signal. According to the disk-rotation-speed signal, the disk recording speed of an optical storage system is adjusted by the rotation speed control apparatus to avoid disk recording interruption due to lack of buffer data.