Patent ID: 8436673
Filing Date: 2013-05-07
Classification: F23Q

Abstract:
1. A semiconductor apparatus exhibiting a current control function, the semiconductor apparatus comprising: a first insulated gate transistor controlling ON and OFF of a main current flowing through the first insulated gate transistor with a driving signal fed thereto; a second insulated gate transistor, ON and OFF thereof being controlled by the driving signal, the second insulated gate transistor comprising a collector connected in common to a collector of the first insulated gate transistor; a sensing resistance connected in series to an emitter of the second insulated gate transistor; a current control circuit detecting a voltage across the sensing resistance, whereby to control the main current flowing through the first insulated gate transistor; a first gate control circuit, the driving signal being applied to the a first gate control circuit; and a second gate control circuit, the driving signal being applied to the a second gate control circuit; the first and second gate control circuits generating gate voltages of the first and second insulated gate transistors separately, whereby, to control the gate voltage of the first insulated gate transistor to be higher than the gate voltage of the second insulated gate transistor, when the main current flowing through the first insulated gate transistor is larger than a predetermined value, and whereby, to control the gate voltage of the first insulated gate transistor to be lower than the gate voltage of the second insulated gate transistor, when the main current flowing through the first insulated gate transistor is smaller than the predetermined value.