Electricity: motive power systems – Motor-reversing – Armature or primary circuit control
Patent
1975-11-14
1976-12-21
Beha, Jr., William H.
Electricity: motive power systems
Motor-reversing
Armature or primary circuit control
318139, 318338, 318350, H02P 1316, H02P 706
Patent
active
039991113
ABSTRACT:
A method and apparatus for controlling the phase retard time of a phase-controlled rectifier circuit in a power conversion system wherein a clock-pulse synchronized alternating voltage source is connected to supply power to the phase-controlled rectifier circuit. The clock pulses controlling the voltage source are detected and delayed for a predetermined time interval prior to their application to the voltage source. A ramp voltage generator synchronized to the clock pulses and a comparator circuit for comparing the ramp voltage signal level to a reference level provide a means for generating gate pulses to control the phase retard time of the phase-controlled rectifier circuit between maximum and minimum retard times. Maximum retard time is established at the occurrence of a clock pulse by applying a gating signal to the rectifier circuit if the rectifier circuit has not been triggered prior to detection of the clock pulse. Further gating signals are inhibited until the alternating voltage source has reversed polarity in response to the delayed clock pulses thus establishing a minimum retard time. The predetermined time interval between detection of the clock pulses and application of the delayed clock pulses to the alternating voltage source is selected to be at least sufficient to allow commutation and achievement of forward voltage blocking ability, by the components of the phase-controlled rectifier circuit.
REFERENCES:
patent: 3378746 (1968-04-01), Weiser
patent: 3466525 (1969-09-01), Ainsworth
patent: 3551778 (1970-12-01), Ekstrom
patent: 3622866 (1971-11-01), Boehringer
patent: 3863134 (1975-01-01), Pollard
Beha Jr. William H.
Beusse James H.
General Electric Company
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