The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 05, 2020
Filed:
Feb. 13, 2019
Rohm Co., Ltd., Kyoto-shi, Kyoto, JP;
ROHM CO., LTD., Kyoto, JP;
Abstract
The present invention relates to a fan motor driving circuit, a driving method, and a cooling device and an electronic machine using the same. The present invention provides a motor driving circuit capable of suppressing strain on coil current and/or reducing noise. A control circuit a control circuit switches an output phase of an H-bridge circuit based on a Hall signal, and in a soft switching duration (Tss) that starts before and ends after the output-phase switching, slowly varies a duty ratio (DUTY) of an output voltage (V) of one leg of the H-bridge circuit over time, and meanwhile, varies a duty ratio (DUTY) of an output voltage (V) of another leg of the H-bridge circuit in an opposite direction with respect to the duty ratio (DUTY) of the output voltage (V) of the one leg.