Title:
STARTING DEVICE FOR MOTOR
Document Type and Number:
Japanese Patent JP3414974
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To realize a starting device for a motor, in which the fluctuation of a soft start time due to the dispersion of parts is suppressed and the rise time of the motor can be set freely.
SOLUTION: A pulse signal output from a comparison circuit A1 is converted into a triangular-waveform pulse signal by a resistor R8 and a capacitor C3, and the triangular-waveform pulse signal is inputted to a comparison circuit A2 as an input signal A2-. A reference voltage A2+ of the comparison circuit A2 is lowered gradually from 5V to 1.5V by a time-constant circuit 25. Accordingly, the gradient of the reference voltage A2+ can be changed by altering the time constant of the time-constant circuit 25, a period up to a zero-cross after falling to a low level of a pulse signal outputted from the comparison circuit A2 is varied, and the conduction timing of a TRIAC Q1 can be changed.
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Inventors:
Takashi Matsunaga
Hitoshi Suzuki
Hitoshi Suzuki
Application Number:
JP6916097A
Publication Date:
June 09, 2003
Filing Date:
March 06, 1997
Export Citation:
Assignee:
Makita Corporation
International Classes:
H02P1/24; H02H9/00; (IPC1-7): H02P1/24
Domestic Patent References:
| JP58224586A |
Attorney, Agent or Firm:
Akito Tagashita (1 person outside)
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