Control circuit for a final control element, in particular an el

Details Control circuit for a final control element, in particular an el Control circuit for a final control element, in particular an el

1979-09-17

1981-06-23

Weldon, Ulysses

Electricity: motive power systems

Motor-reversing

318293, 318256, 318294, 307254, H02P 122

Patent

active

042753406

ABSTRACT:
In order to control the motion of a final control element, for example a servomotor used in the steering gear or the cruise control of a motor vehicle, and to provide for rapid dynamic braking of the servomotor by short-circuiting, the invention provides a bridge circuit consisting of four power transistors each of which is controlled by connection to one input transistor. The bases of pairs of input transistors are joined and receive control signals of equal or opposite values. The emitter of one transistor in each pair is joined to the emitter of another transistor in each pair and is then connected to respective supply lines of the circuit or to a source of an average supply voltage. The overall connection of the circuit is such that when differing signals are applied to the input contacts of the circuit, current flows through one diagonal branch of the bridge and through the servomotor in one direction, whereas, when different signals of opposite polarity are applied to the input contacts, current flows through the servomotor in the opposite direction. When signals of equal value are applied to the input contacts, the circuit provides a short-circuit path through the servomotor, permitting rapid deceleration.

REFERENCES:
patent: 3110851 (1963-11-01), Plogstedt et al.
patent: 3144598 (1964-08-01), Merritt
patent: 3427520 (1969-02-01), Oppedahl
patent: 3496441 (1970-02-01), Heider et al.
patent: 3525883 (1970-08-01), Iordanidis

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