Patent ID: 6542012
Filing Date: 2003-04-01
Classification: H03K

Abstract:
A circuit for driving a gate of an IGBT inverter, comprising:a first IGBT of which collector is connected to a DC voltage source; a second IGBT of which collector is connected to an emitter of the first IGBT and of which emitter is connected to a ground; first and second driving circuits supplying gates and the emitters of the first and second IGBTs with DC driving voltages, respectively, through first and second gate resistors; and first and second noise interruption circuits connected between the gates-emitters of the first and second IGBTs and the first and second driving circuits, respectively, so as to interrupt noises, each of the first and second noise interruption circuits comprising: first and second diodes for supplying the DC driving voltage of the first driving circuit; first resistors for distributing the DC driving voltage; a first switch ON/OFF controlled by the distributed DC driving voltage; second resistors connected in series between the DC voltage source and the emitter of the first IGBT for distributing a DC voltage from the DC voltage source in accordance with an ON/OFF state of the first switch; and a second switch ON/OFF controlled by the distributed DC voltage.