Patent ID: 7821306
Filing Date: 2010-10-26
Classification: H03K

Abstract:
1. A switching device drive circuit for receiving a pulse signal, and outputting a drive signal to a control terminal of a switching device including a power converting circuit for a predetermined period corresponding to the pulse signal, the switching device drive circuit comprising: a control circuit for changing a voltage supplied or a current flowing, as a drive signal, to or through the control terminal of the switching device, to a voltage or a current different from a predetermined voltage or a predetermined current; and a control voltage detecting circuit for detecting a voltage of the control terminal of the switching device, wherein the control circuit receives a voltage detection signal of the control voltage detecting circuit, and depending on a voltage value of the control terminal of the switching device, changes the voltage supplied or the current flowing, as the drive signal, to or through the control terminal of the switching device, to a voltage or a current having a larger value than that of the predetermined voltage or the predetermined current, for a constant period including a portion of a mirror effect period during turning ON of the switching device, as a portion of the predetermined period corresponding to the pulse signal.