Current regulating circuit for an inductive load, particularly a

Details Current regulating circuit for an inductive load, particularly a Current regulating circuit for an inductive load, particularly a

1991-09-12

1992-11-24

Howell, Janice A.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

3072966, 323288, H03L 500, H03L 301, G05F 140

Patent

active

051665433

ABSTRACT:
A current regulating circuit for an inductive load (12) is proposed, in particular for an electrohydraulic pressure regulator for an automatic transmission of a motor vehicle. A push-pull end stage (16) controls the flow of current through the load (12). Connected in series with the load (12) is a measuring resistor (11), the voltage drop of which, as an actual current value, is applied along with a command current value to a comparison stage (23, 34), by the clocked output signal of which the end stage (16) can be controlled. The measuring resistor (11) is disposed between the load (12) and a first switch transistor (10) of the end stage (16). The potential at one of the pickups (19, 20) of the measuring resistor (11) is provided as a variable reference potential for an auxiliary voltage source (31) supplying the comparison stage (23, 34), which source has switch means (40) for generating an auxiliary voltage (Uh) that is constant relative to the variable reference potential. By means of this integratable and hence economical arrangement, only a few external components and no external calibration are necessary. Nevertheless, high precision is assured, over a wide temperature range that depends essentially on the precision of the measuring resistor (11) and on the precision of the analog command value present via the resistor (30).

REFERENCES:
patent: 3436563 (1969-04-01), Regitz
patent: 3947776 (1976-03-01), Stevens et al.
patent: 4142113 (1979-02-01), Lundberg
patent: 4251743 (1981-02-01), Hareyama
patent: 4553082 (1985-11-01), Nesler
patent: 4645945 (1987-02-01), de Sartre
patent: 4672303 (1987-06-01), Newton
patent: 4716372 (1987-12-01), Fauser et al.
patent: 4841166 (1989-06-01), Harnden
patent: 4942509 (1990-07-01), Shires et al.
patent: 5079456 (1992-01-01), Kotowski et al.

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