Fail-safe brake valve driver

Details Fail-safe brake valve driver Fail-safe brake valve driver

1987-02-02

1988-07-26

Hix, L. T.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361167, 25112909, 25112910, H01H 4700, H01H 4732, F16K 3102

Patent

active

047604913

ABSTRACT:
Fail-safe brake valve driver (10) is provided for controlling a dual coil (A,B) brake valve. A pair of identical circuits (12, 14) are each uniquely associated with one of the brake valve coils. By means of control of an operational amplifier (16) and dual-stage current driver (18), the circuits (12, 14) each provide one-half of the current necessary for achieving brake valve control under normal operations. In the event that one of the coils (A, B) or circuits (12,14) fails, relays (56, 156) are provided for removing the failed circuit or coil from operation and allowing the remaining coil and circuit to carry the full operational load.

REFERENCES:
patent: 2989666 (1961-06-01), Brenner et al.
patent: 3870931 (1975-03-01), Myers

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