Title:
SPEED CONTROLLER FOR DC MOTOR
Document Type and Number:
Japanese Patent JPS5935580
Kind Code:
A
Abstract:
PURPOSE:To reduce the Joule loss of a power supply control circuit by applying the output of an error amplifier which detects a rotating speed of a motor through a Schmitt trigger circuit to a power supply circuit. CONSTITUTION:A bridge circuit is composed of a DC motor 17 and resistors 18-20, and the voltages of the detecting terminals A, B of the bridge circuit are applied to an error amplifier 39. When the voltage of the output point E of the amplifier 39 exceeds the upper limit threshold voltage of a Schmitt trigger circuit 40, the voltage of the output point F of the circuit 40 becomes high level, and a power supply transistor 14 is interrupted. When the rotating speed of the motor 17 decreases and the voltage of the output point F of the amplifier 39 becomes the lower limit threshold voltage or lower of the circuit 40, the voltage of the output point F of the circuit 40 becomes a low level, and the transistor 14 is conducted.
More Like This:
Inventors:
YOSHIZAWA FUKASHI
Application Number:
JP14551082A
Publication Date:
February 27, 1984
Filing Date:
August 24, 1982
Export Citation:
Assignee:
OLYMPUS OPTICAL CO
International Classes:
H02P7/288; H02P7/29; (IPC1-7): H02P5/16
Attorney, Agent or Firm:
Kenji Mogami