Patent ID: 7679944
Filing Date: 2010-03-16
Classification: H01L,H02M,H02P,H03K

Abstract:
1. A motor drive comprising: an arm which has an upper arm section and a lower arm section, the upper arm section includes a first electric power semiconductor-switching element and the lower arm section includes a second electric power semiconductor-switching element, both upper and lower arm sections and first and second electric power semiconductor-switching elements are connected in series between major terminals; and a level-shifting circuit which transmits a control signal of the first electric power semiconductor-switching element connected to a high-voltage side of the arm, from a low-voltage circuit to a high-voltage circuit; wherein the motor drive has a circuit composition in which a difference between a grounding voltage of the lower arm section and a grounding voltage of the upper arm section is equal to ΔV wherein ΔV wherein ΔV wherein a signal-transmitting high-withstand-voltage element in the level-shifting circuit is an insulated-gate bipolar transistor.