In many applications, it is important for an inverter to be lightweight and of a relatively small size. This can be achieved by using a High-Frequency Inverter that involves an isolated DC-DC stage (Voltage Fed Push-Pull/Full Bridge) and the DC-AC section, which provides the AC output.
They can pro- duce low-distortion output voltage (THD less than 2% for DC input equal to or higher than 24V), good load regula- tion (better than 2%) and relatively high efficiency (from 80 to 85%) over a wide output power range (75 to 200W). The inverters can operate over an input voltage range from 23 to 28V.
The implementation of bidirectional power flow by connecting a flyback converter at the output of a DC/DC converter type inverter to transfer the reac- tive power back to the DC input source results in increased output voltage distortion due to the delay associated with the reactive power sensing and control.
The inverter efficiency is 78.7% and the output voltage THD is 1.6%. The output voltage and current waveforms with an inductive load (input voltage 24V, real power absorbed by load 114W, and power factor 0.9) are shown in Fig. 14. Under this load condition, the efficiency is 84.6% and the output THD is 2.4%. 4 Conclusions
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