Control device for an electromagnetic consumer in a motor vehicl

Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...

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Details

361154, 123490, H01H 4732

Patent

active

044738617

ABSTRACT:
A control device is proposed for an electromagnetic engine valve or an electromagnetic final control element. The control device operates with closed-loop current control, and the maximum current is ascertained via a measuring resistor located in series with a switching transistor, while the free-running circuit is controlled in accordance with time. This control in accordance with time is effected via a comparator having dynamic positive feedback and acting as a comparison stage. The free-running control circuit includes a diode for protective purposes switched parallel to a transistor.

REFERENCES:
patent: 4040397 (1977-08-01), Leichle
patent: 4293888 (1981-10-01), McCarty
patent: 4339781 (1982-07-01), Harsch et al.
patent: 4345296 (1982-08-01), Breitling

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