Electricity: motive power systems – Braking – Dynamic braking
Patent
1977-10-26
1979-01-23
Schaefer, Robert K.
Electricity: motive power systems
Braking
Dynamic braking
318375, 318381, 318367, H02P 314
Patent
active
041363051
ABSTRACT:
A power converter control apparatus comprising continuously controlled converter units and on-off controlled converter units for effecting powering control and regenerative braking control of a DC motor, which is arranged to include a unit change circuit for generating unit changing operation signals in response to a command for instructing the number of the converter units to be rendered operative from a master controllerand conduction phase signals from a phase shifter. In accordance with the unit changing operation signals, the conduction phase signals from the phase shifter are applied as a gate signal to the continuously controlled converter units in response to a powering control or a regenerative braking command, while a minimum conduction phase signal is applied as a gate signal to the on-off controlled converter units in response to a powering control command signal and a maximum conduction phase signal including a commutation marginal angle in response to a regenerative braking command signal. On the other hand, the gate signals supplied to the continuously controlled converter units may be temporarily cut off by a gate cut-off circuit and at the same time the conduction phase in the output of the phase shifter may be restored.
REFERENCES:
patent: 3735220 (1973-05-01), Renner et al.
patent: 4020411 (1977-04-01), Tsuboi et al.
patent: 4030018 (1977-06-01), Tsuboi
patent: 4061948 (1977-12-01), Lamparter
W. U. Bohli, "Ge 4/4" Thyristor Locomotives, Nos. 611 to 620 of the Rhaetian Railways, Brown Boveri Review, 12-73, pp. 526-536.
Matsumoto Genichi
Nozaki Yoshio
Okumura Yoshio
Tachibana Kyozo
Hitachi , Ltd.
Mutter M. K.
Schaefer Robert K.
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