Multiple frequency chopper control

Details Multiple frequency chopper control Multiple frequency chopper control

1975-12-08

1977-07-19

Schaefer, Robert K.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318345R, 318599, 318332, H02P 506

Patent

active

040371450

ABSTRACT:
A method and control system for minimizing peak current levels in a direct current traction motor drive system in which the traction motor is powered by periodic current pulses metered from a direct current source by a controllable switch. The control system includes apparatus for comparing actual motor current to commanded motor current and for controlling the duty factor of the controllable switch in a manner tending to minimize any difference between actual and commanded currents. The control system further includes apparatus for changing the repetition rate of the current pulses in response to the magnitude of current in the motor, without effecting the commanded duty factor of the controllable switch, so that the ripple currents which are inversely related to repetition rate are reduced as average motor current is increased to thereby maintain total peak current levels within predetermined limits.

REFERENCES:
patent: 3911341 (1975-10-01), Carlson et al.

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