Bootstrapping IPM

Because general inverter circuit, the upper arm three IGBT trigger reference is suspended, so the upper arm trigger need 3 set of isolated power supply. The lower arm three IGBT trigger pulse is the common reference to, only a set of power supply. So a total of up to 4 groups of isolated generator set spare parts power supply. And mitsubishi DIP - IPM using bootstrap circuit structure, can easily achieve single power drive. Specific working principle is as follows: when the DIP - IPM start, first to lower arm IGBT ac motor send enough sufficient charging pulse number or a single pulse, opened lower arm (N) of IGBT, the power supply of the arm caused by internal charging path through IPM make upper arm three bootstrap capacitance charging completely, to the www.facebook.com/guohong.trading upper arm three IGBT trigger pulse power supply. Then began a PWM control pulse. Bootstrap charge circuit path and working 3 phase induction motor sequence diagram.