Further improvement of a transformerless, voltage-boosting inverter for ACmodules

For reducing the manufacturing cost and for increasing the efficiency of mo dule-integrated converter the transformerless concept is suitable. The new type inverter, which is proposed in this paper, basically works as buck boo st DC-DC converter. Therefore, it is possible to reduce the number of the a ctive switches in comparison with conventional inverter for AC modules beca use of simple circuit topology. In this paper authors present the control m ethod and operation test results including both stand alone and grid connec ted for the new type transformerless inverter. These measurement results sh ow that the performances can compete with the conventional small inverter ( rated capacity around 50W). (C) 2001 Elsevier Science B.V. All rights reser ved.