Patent ID: 6573692
Filing Date: 2003-06-03
Classification: H02M

Abstract:
Device for regulating current passing through a self-inductive element, including a series branch including said self-inductive element and a control device driven by a control signal so as to power the self-inductive element from an electrical power-supply source, as well as a measuring device supplying a signal for measuring a first current through the self-inductive element and including a device for acquisition of a measurement signal representative of said first current through the self-inductive element and a regulating device for generating the control signal as a function of a datum value and of the measurement signal, the acquisition device including, in parallel with the self-inductive element (S), a branch including, in series, a first resistive element (Rs) and a diode (D), the diode (D) being in reverse mode when the control device (PT) is in a state in which the self-inductive element (S) is coupled to said power-supply source, wherein an averaging circuit is provided for averaging said measurement signal representative of said first current in order to produce a signal representative of the average current in the self-inductive element, and wherein the averaging circuit includes a transistor (T2) including a gate electrode that receives a switching signal in order to switch said transistor in opposition with said control device (PT), the drain electrode of said transistor (T2) receives a signal representative of the voltage at the terminals of said first resistive element (Rs), and the source electrode of said transistor (T2), which constitutes an output of a signal (Vm) representative of said average current (Im), is connected to a capacitive element (Cm) in parallel with a second resistive element (Rm).