Electricity: motive power systems – Motor-reversing – Armature or primary circuit control
Patent
1993-05-17
1995-01-31
Ro, Bentsu
Electricity: motive power systems
Motor-reversing
Armature or primary circuit control
H02P 729
Patent
active
053861825
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.
REFERENCES:
patent: 4514666 (1985-04-01), Suzuki
patent: 4677356 (1987-06-01), Tsuneda et al.
patent: 4816726 (1989-03-01), Novis et al.
patent: 4859916 (1989-08-01), McCambridge
patent: 4972130 (1990-11-01), Rossi et al.
patent: 4985666 (1991-01-01), Nakabayashi
Electronic Design. vol. 37, No. 21, 12 Oct. 1989, Hasbrouck Heights N.J. pp. 107-112 F. Goodenough `Power IC Drives Motors and Solenoids`.
Kananen Ronald P.
Ro Bentsu
Sony Corporation
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