Patent ID: 8072241
Filing Date: 2011-12-06
Classification: H01L,H02M,H03K

Abstract:
1. A semiconductor device comprising: a semiconductor substrate; a diode-built-in insulated-gate bipolar transistor having an insulated-gate bipolar transistor and a diode, which are disposed in the substrate, wherein the insulated-gate bipolar transistor includes a gate, and is driven with a driving signal input into the gate; and a feedback unit for detecting current passing through the diode, wherein the driving signal is input from an external unit into the feedback unit, wherein the feedback unit passes the driving signal to the gate of the insulated-gate bipolar transistor when the feedback unit detects no current through the diode, wherein the feedback unit stops passing the driving signal to the gate of the insulated-gate bipolar transistor when the feedback unit detects the current through the diode, wherein the feedback unit includes a sensing resistor for detecting the current through the diode, wherein the diode-built-in insulated-gate bipolar transistor further includes a diode current sensing element, wherein the diode current sensing element passes current in proportion to the current of the diode, and wherein the sensing resistor is connected between the diode and the diode current sensing element.