Research on the problem of SPWM inverter

Three phase bridge AC power inverters circuit, the earth with bipolar SPWM modulation technology. Any power switch solid tube are there exists a turn-on and turn off time, to ensure not to attack through the wrong switch tube unified bridge under the arm, the earth the fantasy SPWM drive signal rising edge Off grid inverter(or falling) off a period of time (called Td dead time). The dead zone is accepted in order to guarantee the safe and reliable operation of switching devicesway.