Control circuit for motor driver

Details Control circuit for motor driver Control circuit for motor driver

1985-09-19

1986-12-09

Shoop, Jr., William M.

Electricity: motive power systems

Motor load, armature current or force control during...

318434, 363 19, 363124, 363 49, H02P 104

Patent

active

046282351

ABSTRACT:
A control circuit is provided for operating a power switch with an associated resistance, wherein the power switch has conductive and nonconductive conditions and is adapted to apply a driving voltage across an electric load circuit, such as a D.C. motor, when the power switch is in its conductive condition. The control circuit of the disclosure includes a first voltage divider across the power switch and associated resistor for creating a variable monitored signal corresponding to the generally instantaneous voltage across the power switch and its associated resistance, a second voltage divider for creating a fixed reference signal, a comparator for creating a control signal having a preselected electrical characteristic, such as digital logic, when the monitored signal of the power switch has a given relationship, such as a lesser value, with respect to the reference signal, an output of the comparator for shifting the power switch from the conductive condition to the nonconductive condition upon creation of this control signal or digital logic and an oscillator for periodically creating an energizing signal shifting the power switch into its conductive condition when it is in the nonconductive condition whereby the power switch will be activated and deactivated at a variable pulse width. This prevents high current damage to the motor being driven by the power switch or the power switch itself.

REFERENCES:
patent: 3242475 (1966-03-01), Davis
patent: 3942111 (1976-03-01), Pfouts
patent: 3955130 (1976-05-01), Graf
patent: 4195254 (1980-03-01), Gurwicz et al.
patent: 4359679 (1982-11-01), Regan

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