A high performance amplitude/phase modulated digital-to-synchro switching power converters

In this paper, a high performance three-phase switching digital-to-synchro (D/S) power converter is proposed for driving high power synchro motors. An amplitude/phase modulation algorithm is implemented with digitally controlled sinusoidal pulse-width-modulation. Design methodology and synchronization improvement are also presented. The generated synchro format output is first verified by simulation and then by a digital signal processor controlled hardware prototype testing. Experimental results indicate that the switching amplifier based D/S converter not only shrinks the size over the conventional linear amplifier based unit, but also demonstrates superior performance to the commercially available unit.