Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1977-09-20
1978-10-17
Smith, Jr., David
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
307252UA, 318341, H02P 516
Patent
active
041211421
ABSTRACT:
The present invention is a DC motor drive circuit in which each end of a center tapped supply transformer is connected through a pair of back-to-back thyristors to corresponding ends of a center tapped choke coil. The motor armature is connected between the two center taps. After each zero crossing of an AC input signal, a ramp signal is generated. The ramp is comprised of two linear segments of different slopes to improve the linearity of the output of the thyristors as the conduction angle approaches the zero crossing point. Comparator circuits are responsive to the ramp signal and a command signal for generating trigger pulses to the thyristors. The comparators are biased so that with no command signal present, the comparators operate the thyristors to produce a small alternating loop current through the transformer and the choke with each half cycle of the AC input signal. This maintains conduction through all the thyristors without dithering the motor armature.
REFERENCES:
patent: 3651375 (1972-03-01), Ebersohl
patent: 3675104 (1972-07-01), Allison et al.
patent: 3859591 (1975-01-01), Saunders
patent: 3879652 (1975-04-01), Billings
Gibson Roy
Morser Alfred Harold
Parker Bruce Trayton
Szekely Paul
Cincinnati Milacron Inc.
Eby C. Richard
Smith Jr. David
LandOfFree
Full-wave bidirectional DC motor drive circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Full-wave bidirectional DC motor drive circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Full-wave bidirectional DC motor drive circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-377905