A modulation technique for four-leg voltage source inverter without needing the look-up table

In this paper, a modulation technique is proposed for four-leg voltage source inverter which is simpler than other techniques. Unlike previous techniques, the proposed technique needs no switching vectors determination and duty ratio calculation. In this technique, turn-on time interval of upper switches, in every switching period, is calculated without needing the look-up table and complex equations. As a result, it is very simple to implement and produce the dead time. Several Simulations in PSCAD/EMTDC environment confirm the validity and advantages of the proposed technique. Experimental results by using DSP-TMS320F2812 are also provided to confirm the validity of the proposed technique.