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Patent Searching and Data


Title:
PROTECTIVE DEVICE FOR CHOPPER OF ELECTRIC ROLLING STOCK
Document Type and Number:
Japanese Patent JPS5619303
Kind Code:
A
Abstract:

PURPOSE: To prevent a failure of the commutation of a chopper generated due to the low electromotive force of a motor in a low speed range previously by a method wherein output from a voltage detector of a filter capacitor and a detector of motor currents is utilized.

CONSTITUTION: Ouput from a pattern circuit 22 and the voltage of a filter capacitor 5, output from a voltage detector 6, are compared by means of a comparison circuit 23. When the speed of an electric rolling stock drops and the voltage of the filter capacitor 5 becomes to a specified value or less, the comparator 22 functions, and sends out ON output. Thus, a solenoid valve 26 is turned OFF while the gate pulses of a chopper 10 are stopped, and a failure of commutation is prevented.


Inventors:
Yomo, Susumu
Application Number:
JP1979000082320
Publication Date:
February 24, 1981
Filing Date:
June 26, 1979
Export Citation:
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Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
H02P3/14; B60L3/04; (IPC1-7): B60L3/04