Electricity: motive power systems – Open-loop stepping motor control systems
Patent
1980-10-06
1983-12-13
Truhe, J. V.
Electricity: motive power systems
Open-loop stepping motor control systems
318685, H02K 2904
Patent
active
044207174
ABSTRACT:
A stepper motor for use in peripheral devices such as electronic printing terminals has its coils selected for activation by selection circuitry, with its power provided by a switch mode current regulator. The switch mode regulator utilizes the selected motor winding as the storage element of the regulator and the voltage ramp derived from the current flow through the motor coil itself for comparison with a reference voltage. The output of the comparator circuit controls the state of a latch which has a fixed frequency clock input. The frequency of the latch output is fixed, but the on time and off time of the latch varies in accordance with the output of the comparator. A comparator and latch circuit therefore form a pulse width modulator which then regulates the on and off time of the switching regulator power transistor.
REFERENCES:
patent: 3750000 (1973-07-01), Bruckner et al.
patent: 3976926 (1976-08-01), Egbert
patent: 4282472 (1981-08-01), Martin
Culley Paul L.
Wallace Steven J.
Bergmann Saul M.
Devine Thomas G.
Heiting Leo N.
Sharp Melvin
Texas Instruments Incorporated
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