Economical circuit of a three-phase PWM AC power controller with a new control algorithm without 'dead time'

摘要

In this paper a new economical control algorithm of a three-phase PWM AC power controller with (2+2) transistorized switches has been discussed. The switching frequency of the described PWM AC power controller is f/sub s//spl Gt/f, where: f=frequency of the supply voltage. Test results of this power controller using a traditional and a new control algorithm has been described. The new algorithm has been realized in two ways. In the first variant, instantaneous values of the load current in two phases are exclusively measured. In the second variant, two line-to-line output voltages are additionally measured.