US 8,803,497 B2 · Current detector of inductive load

Abstract

A current detector of an inductive load includes: an inductive load 100; a switching element 101 connected in series with the inductive load and controls an electric current to be carried through this inductive load by ON/OFF operation; a current circulating diode 102 connected in parallel with the inductive load and circulates an electric current of the inductive load when the switching element is OFF; current detecting device 103 making a sampling in a cycle of a predetermined sampling period to detect an electric current to be carried through the switching element 101; and current correction device 104 making a correction with respect to an electric current value having been detected at the current detector, and in which the current correction device 104 changes the correction rate based on DUTY of a pulse with which the switching element is brought in ON/OFF operation.

Claims12

Dependent claims

A current detector, comprising:

an inductive load;
a switching element that is connected in series with said inductive load and which controls an electric current carried through said inductive load by an ON/OFF operation;
a current circulating diode that is connected in parallel with said inductive load and which circulates an electric current of the inductive load when said switching element is OFF;
a current detecting means which samples a cycle of a predetermined sampling period to detect an electric current carried through said switching element;
and
a current correcting means which makes a correction with respect to an electric current value having been detected at said current detecting means,
wherein said current correcting means changes a correction rate based on a DUTY of a pulse with which said switching element is brought in ON/OFF operation, and wherein an output current of the current correcting means is used as an input to the current correcting means.

4 more elements

A current detector, comprising:

an inductive load;
a switching element that is connected in series with said inductive load and which controls an electric current carried through said inductive load by an ON/OFF operation;
a current circulating diode that is connected in parallel with said inductive load and which circulates an electric current of said inductive load when said switching element is OFF;
a current detecting means which samples a cycle of a predetermined sampling period to detect a circulated current carried through said current circulating diode;
and
a current correcting means which makes a correction with respect to an electric current value having been detected at said current detecting means,
wherein said current correcting means changes a correction rate based on a DUTY of a pulse with which said switching element is brought in ON/OFF operation, and wherein an output current of the current correcting means is used as an input to the current correcting means.

4 more elements

Dependencies are inferred from the claim text.

Current detector of inductive load

Life of this patent

Current detector of inductive load

Life of this patent

Abstract

Claims12