Electricity: motive power systems – Motor-reversing – Armature or primary circuit control
Patent
1974-09-09
1976-03-16
Shoop, William M.
Electricity: motive power systems
Motor-reversing
Armature or primary circuit control
318257, 318624, 318631, H02M 118
Patent
active
039449076
ABSTRACT:
A four-quadrant full-wave static converter having improved time response without current cross-over deadband. An alternating current wave is imposed on the direct current input signal, which generates gate pulses for appropriate thyristors at the desired firing angle. The applied alternating current signal can be of approximately the same magnitude as the converter deadband, so as the direct current signal varies from zero a portion of the control signal moves out of the deadband area. For fast response the magnitude of the alternating current signal can be greater than the deadband signal. As the magnitude of the direct current signal increases the relative magnitude of the alternating current signal is decreased, preventing a large DC component from being imposed on the supply during high current operations. Cycling of the imposed alternating current waves is synchronized with the firing angle point O to maintain system protection.
REFERENCES:
patent: 3110851 (1963-11-01), Plogstedt et al.
patent: 3439246 (1969-04-01), Moritz
patent: 3579080 (1971-05-01), Vollrath
patent: 3795850 (1974-03-01), Grygera
patent: 3821628 (1974-06-01), Caputo
Newcamp Charles W.
Weit James G.
Control Systems Research, Inc.
Massung Howard G.
Shoop William M.
Yeager Robert D.
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