Patent ID: 8421184

Claim:
A semiconductor device comprising: a semiconductor substrate including a first semiconductor layer having a first conductive type and at least one second semiconductor layer having a second conductive type and formed in a surface portion of a first surface of the first semiconductor layer; a diode including a first electrode and a second electrode; a control pad; a control electrode electrically coupled with the control pad; a switching element for controlling to open and to close according to a driving signal, a voltage level of which is switched; and an insulation member, wherein the first electrode is formed on a second surface of the first semiconductor layer, the second electrode is formed on the first surface of the first semiconductor layer, current flows between the first electrode and the second electrode, the control pad is arranged on the first surface of the first semiconductor layer, and the control pad inputs a control signal for controlling an injection amount of a carrier into the first semiconductor layer, the insulation member insulates between the control electrode and the second electrode and between the control electrode and the semiconductor substrate, the diode is coupled in series with the switching element, and a polarity and an amplitude of the control signal are determined based on a frequency of the driving signal.