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:
Jan. 31, 1995
Filed:
May. 17, 1993
Akira Nikami, Kanagawa, JP;
Sony Corporation, , JP;
Abstract
A motor driving PWM signal generating circuit (1) includes a read-only memory (ROM) (2) in which there is stored data of a PWM signal corresponding to 0 to 180 degrees of a sine wave. A signal representative of an arbitrary rotary phase is supplied to the generating circuit (1) which generates a PWM output signal having a duty ratio of 50% to 100% corresponding to a sine wave of, for example, 0.degree. to 180.degree. degrees. Also, the generating circuit (1) generated signals representative of 0.degree. to 180.degree. degrees of the rotary phase and 180.degree. to 360.degree. degrees of the rotary phase as DIR output signals. The PWM signal and the DIR output signal from the generating circuit (1) are supplied to an exclusive-OR circuit (3). A signal from the exclusive-OR circuit (3) is supplied to an IN input of an H-type bridge driver circuit (4). Therefore, a level difference portion (crossover distortion) on the inverted portion of the driving signal can be removed and the motor can be driven smoothly without discontinuity.