Patent ID: 6788088
Filing Date: 2004-09-07
Classification: G01R,H02M

Abstract:
A semiconductor device equipped with a current detection function, comprising:a first power transistor which is positioned in an upper arm side with respect to an inductive load and which supplies drive current in a first direction; a first current adjustment device which causes current to flow in a direction opposite to the first direction with respect to the first power transistor; a first current mirror circuit through which a current flows that is proportional to the current flowing through the first power transistor; a first current detection device which detects the current flowing in the reverse direction to the first direction through the first current mirror circuit; a second power transistor, connected in series with the first power transistor, which is positioned in a lower arm side with respect to the inductive load and which supplies drive current in a second direction which is different from the first direction; a second current adjustment device which causes current to flow in a direction opposite to the second direction with respect to the second power transistor; a second current mirror circuit through which a current flows that is proportional to the current flowing through the second power transistor; a second current detection device which detects the current flowing in the reverse direction to the second direction through the second current mirror circuit; and a drive device which drives the first power transistor and the second power transistor respectively, wherein: while the first power transistor and the second power transistor are both being controlled to be OFF by the drive device, the current which flows through the inductive load is detected based upon the reverse direction current which is detected by at least one of the first current detection device and the second current detection device.