Driver circuit for solenoid operated fuel injectors

Details Driver circuit for solenoid operated fuel injectors Driver circuit for solenoid operated fuel injectors

1988-10-20

1990-02-27

Pellinen, A. D.

Boots, shoes, and leggings

Orthopedic boot or shoe with corrective element

Arch support

123490, 361167, 361187, 323272, H01H 4732

Patent

active

049051202

ABSTRACT:
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.

REFERENCES:
patent: 4327693 (1982-05-01), Busser
patent: 4347544 (1982-08-01), Ohba
patent: 4550659 (1985-11-01), Yamanga
patent: 4604675 (1986-08-01), Pflederer
patent: 4631628 (1986-12-01), Kissel
patent: 4680667 (1987-07-01), Petrie
patent: 4764840 (1988-08-01), Petrie et al.

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