Title:
PWM CONTROL CIRCUIT AND SERVO SYSTEM EQUIPPED WITH PWM CONTROL CIRCUIT
Document Type and Number:
Japanese Patent JP3282218
Kind Code:
B2
Abstract:
PURPOSE: To allow fine speed control at the time of startup of a motor by providing a PWM circuit generating PWM pulses having a duty corresponding to the output from a PWM data selecting means.
CONSTITUTION: A section for raising the speed of a capstan motor 1 to a reference level comprises a timing level controller 12, a level selector 13, a register group 14, and a data setting circuit 15, wherein the timing level controller 12 switches a switching circuit 7 forcibly to S side at a predetermined timing. On the other hand, outputs from the register group 14 are fed selectively to S side of the switching circuit 7 by switching the level selector 13 sequentially. The register group store PWM data D1-Dn for controlling the speed of the capstan motor 1 finely and the PWM data D1-Dn are set by the data setting circuit 15. Since a driving voltage of (n) levels is fed at the time of rising of the capstan motor 1, rotational speed reaches quickly to a reference level.
Inventors:
Yasuhiro Tanaka
Hideo Honda
Hideo Honda
Application Number:
JP18165192A
Publication Date:
May 13, 2002
Filing Date:
June 17, 1992
Export Citation:
Assignee:
ソニー株式会社
International Classes:
H02P1/18; H02P7/29; (IPC1-7): H02P5/17; H02P1/18
Domestic Patent References:
| JP57129179A | ||||
| JP63287395A |
Attorney, Agent or Firm:
Akira Koike (2 outside)
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