Patent ID: 7957167
Filing Date: 2011-06-07
Classification: H02M,H03K

Abstract:
1. A semiconductor element drive device comprising: two semiconductor elements which are series-connected between main power supply terminals; a low-voltage side drive circuit for driving a low-voltage side semiconductor element, which is one of said two semiconductor elements, with reference to a ground potential of the low-voltage side semiconductor element; a high-voltage side drive circuit for driving a high-voltage side semiconductor element with reference to a potential of a series connection point between said semiconductor elements; a pulse generation circuit for generating a set pulse signal and a reset pulse signal, which serve as an ON instruction and an OFF instruction for the high-voltage side semiconductor element, with reference to the ground potential of the low-voltage side semiconductor element; and a level shift circuit for shifting the levels of the set pulse signal and reset pulse signal toward a high-voltage side with reference to the potential of the series connection point and transmitting the resulting set pulse signal and reset pulse signal to said high-voltage side drive circuit; said two semiconductor elements being turned ON/OFF before and after dead time during which the semiconductor elements are both OFF, and alternative current is output, wherein said pulse generation circuit continues to output the ON time of the reset pulse signal during the entirety of the dead time during which the high and low voltage side semiconductor are both OFF to said level shift circuit, and wherein the reset pulse has the same duration as the dead time.