| 摘要 |
PROBLEM TO BE SOLVED: To reduce noise of the switching operation of the MOS gate type element constituting the main circuit of a power converter. SOLUTION: A driving circuit 20 for IGBT1 consists of MOSFETs 21 to 24 and a control circuit 25 and turns on/off MOSFET 21 and MOSFET 22 alternately; and the MOSFET 23 is turned on with a specific amplitude only for a specific period after the MOSFET 21 is turned on and the MOSFET 24 is turned on for a specific period after the MOSFET 22 is turned on and when the gate voltage of IGBT1 decreases below a specific value, thereby reducing noise in the switching operation without spoiling the switching speed of IGBT1. |
