METHOD FOR THE CLOSED-LOOP CONTROL OF THE CURRENT INTENSITY OF THE ELECTRICAL CURRENT FLOWING THROUGH AN INDUCTIVE CONSUMER AND CORRESPONDING CIRCUIT ARRANGEMENT

摘要

The invention relates to a method for the closed-loop control of the current intensity (Iact) of the electrical current flowing through an inductive consumer (3), wherein the consumer is connected in series with a switching apparatus (5) and a current measurement device (4) and is connected in parallel with a freewheeling element (7), and the switching apparatus (5) is actuated for adjusting the current intensity (Iact) during a pulse width modulation period. Provision is made here for a mean load voltage (UmL) to be set during the pulse width modulation period to be determined from an input current intensity (IE) by means of a first controller (13), which mean load voltage is set in the pulse width modulation period by means of the switching apparatus (5) at the consumer (3), wherein the mean load voltage (UmL) or a setpoint load voltage (UsL) determined by means of a second controller (22) from a predetermined setpoint current intensity (Iset) is supplied to a model (15) matched to the consumer (3), and wherein the input current intensity (IE) is determined from the difference between the predetermined setpoint current intensity (Iset) and a differential variable (&Dgr;I) between an actual current intensity (Iact) through the consumer (3) and a model current intensity (Imodel) determined by means of the model (15). The invention furthermore relates to a circuit arrangement (1).