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SEMICONDUCTOR DEVICE

  • US 20120206190A1
  • Filed: 02/14/2012
  • Published: 08/16/2012
  • Est. Priority Date: 02/15/2011
  • Status: Abandoned Application
First Claim
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1. A semiconductor device comprising:

  • a semiconductor circuit; and

    an electric-power supply, whereinthe semiconductor circuit comprisesa main element including a voltage-drive-type switching element, and an antiparallel diode connected in anti-parallel with the switching element,a reverse voltage application circuit including a high-speed free wheeling diode having a reverse recovery time of which is shorter than the antiparallel diode, and a reverse recovery charge of which is smaller than the antiparallel diode, a capacitor, and an auxiliary element connected between the capacitor and the high-speed free wheeling diode, configured to be turned on at the time of reverse recovery of the antiparallel diode, and having a withstand voltage of which is lower than the main element, and configured to apply a reverse voltage lower than the withstand voltage of the main element to the antiparallel diode,a main element drive circuit configured to supply a control signal to the main element, andan auxiliary element drive circuit configured to supply a control signal to the auxiliary element, andthe electric-power supply is connected in parallel with the capacitor, is further connected to the main element drive circuit, and the auxiliary element drive circuit, is configured to supply electric-power to the capacitor, the main element drive circuit and the auxiliary element drive circuit, and has a voltage lower than the withstand voltage of the main element.

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