Electricity: motive power systems – Limitation of motor load – current – torque or force
Patent
1983-03-14
1984-09-25
Truhe, J. V.
Electricity: motive power systems
Limitation of motor load, current, torque or force
318341, 318599, 318333, 318334, 318349, 363124, 363127, 363129, 307125, 307127, 307130, H02K 1314, H02M 702
Patent
active
044737840
ABSTRACT:
A circuit for controlling the power delivered to a load from an alternating current source includes a bridge rectifier coupled to the alternating current source for developing full and half-wave rectified signals in response thereto. The full and half-wave rectified signals are algebraically added to form a reference signal which is applied to one input of a comparator, the other input comprising an adjustable direct current control signal. The output of the comparator comprises a pulse width modulated signal which is used to control the state of a switching transistor connected in series with the load between the rectifier node developing the full-wave rectified signal and a point of reference potential.
REFERENCES:
patent: 3466522 (1969-09-01), Cushing, Jr.
patent: 3546555 (1968-04-01), Morgan et al.
patent: 3739198 (1973-06-01), Clements
patent: 3792330 (1974-02-01), Ottoson
patent: 3855511 (1974-12-01), Smith
patent: 4039913 (1977-08-01), Clegg
patent: 4202032 (1980-05-01), Morez
Operational Amplifiers (2nd Edition) by G. B. Clayton, Butterworth Scientific.
Ip Paul Shik Luen
Truhe J. V.
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