EMKO-TUB (61) S003/85, EN 55014 L. DC / AC converters 110 W / 140 W. DC / AC converters are used as a mains power supply in vehicles or various applications requiring an alternative current source to be output. They are ideal for supplying a unit drawing 220 Vac from a 12 V or 24 V direct voltage source (battery type). They convert the DC voltage into AC voltage.