| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a gate drive circuit and a power control method therefor in a MOS gate drive power IC, for use as a power supply of an upper arm drive circuit for supplying a gate signal to the main IGBT 21 of the upper arm of an inverter, with a simple and stable power supply without need of preparing a special power supply. <P>SOLUTION: In a period of being unable to perform bootstrap charge (a period of an IGBT 21 of a lower arm being off, and a floating potential at a point A remaining in a high potential), a power supply capacitor 10 can be charged by repeated charge pump operations of charging an auxiliary capacitor 19 from a power supply 6, and discharging from the auxiliary capacitor 19 to power supply capacitor 10 by alternately driving a PMOS 17 and an NMOS 18. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
