ABSTRACT
This chapter presents the trends in the control of medium and high-power converters. The pulse width modulation (PWM) controller represents the final module within the feedback control path. The pulse width is accordingly modified around half of the switching period depending on the polarity and value of the input voltage. The whole control algorithm is therefore brought down to the time scale of the PWM algorithm. Many microcontrollers do not benefit from a dedicated motor control peripheral and they can implement PWM algorithms using software. The time constant or pulse width associated to each phase can be stored within an 8-bit registry and loaded into counters at each SYNC signal. The whole control algorithm is therefore brought down to the time scale of the PWM algorithm. At the price of some extra switchings per fundamental period, other reduced-loss Space vector modulation algorithms may be implemented on the same hardware.
