Linear D.C. drive circuit

Details Linear D.C. drive circuit Linear D.C. drive circuit

1976-04-19

1977-12-13

Dobeck, B.

Electricity: motive power systems

Positional servo systems

With particular 'error-detecting' means

318599, 318689, 74 547, B64C 1702

Patent

active

040631419

ABSTRACT:
A d.c. load is energized through a full wave bridge circuit from an a.c. source in accordance with a d.c. control signal. The d.c. control signal is modulated so as to produce a train of unipolar pulses having pulse widths proportional to the magnitude of the d.c. control signal and synchronized so that the midpoints of successive pulses occur at the peaks of successive half cycles of the a.c. source voltage. A steering network couples the modulated width pulses to either a first or second transistor means in the bridge circuit depending upon the polarity of the d.c. control signal. The selected transistor means is saturated throughout the occurrence of an applied modulated width pulse and arranged so that energizing current is passed through the load in a forward or reverse direction, respectively, depending upon which of the transistor means is actuated.

REFERENCES:
patent: 3422326 (1969-01-01), White et al.
patent: 3525029 (1970-08-01), Joslyn et al.
patent: 3870940 (1975-03-01), Espen
patent: 3883788 (1975-05-01), Storey, Jr.

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