Patent ID: 8988105
Filing Date: 2015-03-24
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 unit, 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, wherein the diode unit includes a diode element and a diode current sensing element, and wherein the diode current sensing element passes current in proportion to current flowing through the diode element; a sensing resistor coupled with the diode current sensing element; and a feedback unit, wherein the driving signal is input from an external unit into the feedback unit, wherein the feedback unit provides a first diode current threshold, which defines whether the diode element passes current, wherein the feedback unit compares a voltage between two ends of the sensing resistor with the first diode current threshold, wherein the feedback unit passes the driving signal to the gate of the insulated-gate bipolar transistor so that the insulated-gate bipolar transistor turns on when the voltage between two ends of the sensing resistor is equal to or larger than the first diode current threshold, and wherein the feedback unit stops passing the driving signal to the gate of the insulated-gate bipolar transistor so that the insulated-gate bipolar transistor turns off when the voltage between two ends of the sensing resistor is smaller than the first diode current threshold.