Patent ID: 8415989
Filing Date: 2013-04-09
Classification: H01L,H02H,H02J,H03K

Abstract:
1. A switching device used in an electric circuit, comprising: a main insulated-gate field-effect transistor comprising a drain region of a first conductive type, a body region of a second conductive type disposed on the drain region and having an exposed surface, a source region of the first conductive type formed in the body region and having an exposed surface, a drain electrode in ohmic contact with the drain region, a source electrode in ohmic contact with the source region and in Schottky contact with the body region, a gate insulator layer formed on an exposed surface of the body region between the source region and the drain region, a gate electrode opposed to the exposed surface of the body region via the gate insulator layer; a protective switch having a first end connected with the drain electrode of the main insulated-gate field-effect transistor, a second end connected with the gate electrode of the main insulated-gate field-effect transistor, and a control terminal; and protective switch control connected with the control terminal of the protective switch and having a function to make the protective switch into an on-state when a voltage is impressed in between the drain electrode and the source electrode in a direction to make the Schottky contact in the main insulated-gate field-effect transistor to be inversely biased.