Mediatek Corporation

Je-Shen Hu

Sheng-Fu Hsu

Tzu-Ching Yang

Chih-Lung Tai

Ming-Kuang Chang

Chi-Jui Lee

A surge-protection circuit for a chip is provided. The surge-protection circuit includes a detection element and a protection element. The detection element is embedded on the chip and arranged between a first terminal and a second terminal, and the detection element is utilized to detect whether an abrupt voltage variation occurs due to a surge or not and generate an enabling signal when the abrupt voltage variation occurs. The protection element is embedded on the chip and coupled to the detection element, and the protection element is utilized to adjust and reduce the abrupt voltage variation through bypassing high energy generated by the surge after receiving the enabling signal.

Surge-protection circuit and surge-protection method

A driving method for a spindle motor and associated driving system and apparatus are provided. The driving method includes the following steps. Plural modulation signals and plural floating phases corresponding to the plural modulation signals are adjusted. A floating period comes immediately after an active period of each of the plural modulation signals according to the plural floating phases. During the floating period, a demagnetization time of the spindle motor is acquired according to a first terminal voltage signal at a first terminal of the spindle motor. If the demagnetization time is not smaller than the threshold time period, the step of adjusting the plural modulation signals is repeatedly done. Whereas, if the demagnetization time is smaller than the threshold time period, after the demagnetization time, a phase of the spindle motor is obtained according to the first terminal voltage signal.

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Hsinchu, Taiwan

Je-Shen Hu