Weltrend Semiconductor Inc.

Meng-Che Tsai

Ta Hsien

Ming-Hung Kao

Chien-Tsung Hung

Hsuan-Ying Chen

Te-Wei Hsu

Hung-Chih Chiang

Ming-Sheng Liu

Yu-Kai Wong

A universal serial bus (USB) Type-C interface architecture includes a USB plug, a USB socket, a power delivery controller, a first pin, a second pin, a first resistor switch, a second resistance switch, a third resistance switch and a fourth resistance switch. The first pin includes a first end coupled to the USB plug, and a second end coupled to the power delivery controller. The second pin includes a first end coupled to the USB plug, and a second end coupled to the power delivery controller. The first resistance switch controls the connection between a first resistor and the first pin. The second resistor switch controls the connection between a second resistor and the first pin. The third resistor switch controls the connection between a third resistor and the second pin. The fourth resistor switch controls the connection between a fourth resistor and the second pin.

Universal serial bus architecture

A motor is coupled to a motor control device including a set of high-side switches, a set of low-side switches, a capacitor and a controller. The set of high-side switches and the set of low-side switches are coupled to the motor. The capacitor is coupled to the set of high-side switches. The controller is coupled to the capacitor, the set of high-side switches and the set of low-side switches. A method of braking the motor includes upon the motor being disconnected from an external power source, the controller receiving a supply voltage from the capacitor, turning on the set of low-side switches, turning off the set of high-side switches, and the controller switching the set of low-side switches according to the supply voltage.

Motor control device for achieving safe and efficient braking and motor braking method thereof

Image dewarping includes capturing a source image from a camera, selecting an input row of pixels from the source image, if the input row of pixels comprises a plurality of input pixels in a region of interest in the source image, storing the plurality of input pixels to a memory to generate an input segment of pixels, when a plurality of pixels required to generate an output row of pixels are all stored in the memory, reading from the memory the plurality of pixels corresponding to the output row of pixels, and performing coordinate transformation on the plurality of pixels to generate the output row of pixels, and when coordinate transformation has been completed on the plurality of pixels, releasing from the memory an input segment of pixels of the plurality of input segments of pixels that does not correspond to other output rows of pixels.

Image dewarping device and method

A motor system includes a brushless direct current motor, a back electromotive force (EMF) circuit, and a control unit. The brushless direct current motor includes first to third windings. The back EMF circuit is coupled to the first to the third windings. The control unit is coupled to the back EMF circuit for floating the first winding, energizing the second winding, and energizing the third winding prior to detect a zero-crossing event. The back EMF detects a duration of a freewheeling period of a back EMF signal of the first winding and a zero-crossing event. The control unit updates respective initial angles of respective driving currents of the first to the third windings according to the duration of a freewheeling period, and performs commutation according to respective updated initial angles of the respective driving currents of the first to the third windings upon detecting the zero-crossing event.

Phase compensation method of brushless direct current motor and motor system utilizing the same

A projector focusing method includes acquiring a plane angle of a light beam and acquiring a first distance and a second distance between two sides of a light beam edge displayed on a projection plane and a time of flight device after the time of flight device emits the light beam to the projection plane, acquiring a plane equation of the projection plane according to the first distance and the second distance, acquiring an optical axis vector of a digital micro-mirror device (DMD) disposed inside the projector, designating target coordinates of the DMD, converting the target coordinates to the projection target coordinates on the projection plane according to the plane equation, acquiring an customized emitting vector according to the projection target coordinates and a lens position of the projector, and acquiring an ideal focal distances of the projector according to the customized emitting vector and the optical axis vector.

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Hsinchu, Taiwan

Meng-Che Tsai