Patent ID: 7777472
Filing Date: 2010-08-17
Classification: G01R,H02M

Abstract:
1. A current detector circuit that detects a current flowing in an object and that outputs a voltage corresponding to the detected current as a detection result, the current detector circuit comprising: a first p-channel transistor having a source connected to a power supply and a gate connected to a ground, the first p-channel transistor being configured to allow the passage therethrough of a current that is 1/N of a current flowing through a transistor which drives the object; a second p-channel transistor having a source connected to a drain of the first p-channel transistor; a third p-channel transistor connected to the object; a voltage mirror circuit having a first terminal connected to a drain of the second p-channel transistor and a second terminal connected to a drain of the third p-channel transistor, the first terminal and the second terminal having the same voltage potential; and a first n-channel transistor having a drain connected to the drain of the first p-channel transistor, a source grounded through a sense resistor, and a gate to which a voltage operative in a saturation region is applied, the first n-channel transistor outputting a source voltage as the detection result of the current detector circuit.