DC motor speed controller having protection

Details DC motor speed controller having protection DC motor speed controller having protection

1988-10-19

1989-10-10

Ro, Bentsu

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307112, 318434, 318599, 388903, H01H 8312

Patent

active

048734535

ABSTRACT:
A controller for a batter-drive DC motor controls the average motor current by switching a series-connected FET on and off with a pulse-width-modulated gate signal. Motor speed is changed by chaning the duty cycle of the signl, which is generated by an oscillator. An undervoltage protection circuit senses the battery voltage and compares it with a reference system that has hysteresis. An overload protection circuit senses the motor current, integrates the sensed signal, and comprares the result with a Zener reference diode that is connected in an amplifier circuit for positive feedback. The oscillators's pulse-width-modulated output, the undervoltage protection circuits's output, and the overload protection circuit's output are input to a "NOR" Logic gate, whose output drives the gate of the FET.

REFERENCES:
patent: 3874743 (1975-04-01), Fleischer et al.
patent: 3995912 (1976-12-01), McNinch; Jr. et al.
patent: 4186315 (1980-01-01), Benton
patent: 4227127 (1980-10-01), Fukaya et al.
patent: 4511890 (1985-04-01), Kouzai et al.
patent: 4618780 (1986-10-01), Ikoma et al.

Affiliated with

Also associated with

Rating

DC motor speed controller having protection does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with DC motor speed controller having protection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and DC motor speed controller having protection will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1959391