Control circuit for motor driver

Patent · Tue Dec 09 04:00:00 EST 1986

OSTI ID:6768612

Goings, J R

A control circuit is described for operating a power switch with an associated resistance, the power switch having nonconductive and conductive conditions and adapted to apply a driving voltage across an electrical load circuit when the power switch is in its conductive condition. The control circuit comprises: means for creating a variable monitored signal corresponding to the generally instantaneous voltage across the power switch and associated resistance; means for creating a fixed reference signal; means for creating a control signal having a preselected electrical characteristic when the monitored signal has a given relationship with the reference signal; first means for shifting the power switch from the conductive condition to the nonconductive condition upon creation of the control signal, and, second means for periodically creating an energizing signal in the form of pulses shifting the power switch into the conductive condition when it is in the nonconductive condition. A method is described of operating a power switch having nonconductive and conductive conditions and adapted to apply a driving voltage across an electrical load circuit when the power switch is in its conductive condition. The method comprises: (a) rendering the power switch conductive; (b) measuring the voltage across the power switch and associated resistance; (c) shifting the power switch to the nonconductive condition when the measured voltage exceeds a preselected value; and (d) creating a series of energizing pulses having a low duty cycle and a high frequency which pulses will render the power switch conductive when it is nonconductive.

• Assignee: Gulf and Western Manufacturing Co., Southfield, MI
• Patent Number(s): US 4628235
• OSTI ID: 6768612
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420800* -- Engineering-- Electronic Circuits & Devices-- (-1989)
CONTROL SYSTEMS
ELECTRIC CONDUCTIVITY
ELECTRIC MOTORS
ELECTRIC POTENTIAL
ELECTRICAL PROPERTIES
ELECTRONIC CIRCUITS
MONITORING
MOTORS
PHYSICAL PROPERTIES
PULSES
SIGNALS
SWITCHING CIRCUITS