F - Mech Eng,Light,Heat,Weapons – 02 – M
Patent
F - Mech Eng,Light,Heat,Weapons
02
M
342/38
F02M 51/00 (2006.01) H01H 47/00 (2006.01)
Patent
CA 1335901
A driver circuit for first and second coils includes first and second selector switches coupled in series between first terminals of the coils and a first common junction, first and second diodes coupled in series between second terminals of the first and second coils, respectively, and a second common junction and a source of first potential coupled to the first common junction. A modulation switch is coupled between the second common junction and a source of second potential. The selector switches and modulation switches are operated to cause currents of controlled magnitude to flow through the coils. The circuit has improved fault immunity whereby at least one coil can be energized even when another coil has been subjected to a chassis ground fault.
613178
Grembowicz Conrad Gene
Harrell Bradley W.
Caterpillar Inc.
Kirby Eades Gale Baker
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