Fail-safe brake valve driver
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jul 26, 1988
Grant Date -
N/A
app pub date -
Feb 2, 1987
filing date -
Feb 2, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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Cited Art Landscape
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