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INVERTERS 891<br />

12 V 24 V 48 V 96 V 192 V<br />

S1<br />

S3<br />

S4<br />

S2<br />

Analog-to-digital converter<br />

Input for<br />

grid monitoring<br />

Grid<br />

1.5<br />

1.0<br />

V/V eff<br />

0.5<br />

0.0<br />

0 30 60 90 120 150 180 210 240 270 300 330 360<br />

Figure 19.35<br />

Digital waveform synthesis inverter<br />

This concept provides extremely high efficiency since no induction coils or other<br />

magnetic elements are required (see Figure 19.35). One disadvantage that can be seen<br />

in the use of multiple voltage sources is the increase in cabling needs between the PV<br />

generator and the inverter.<br />

In this concept the switches (transistors) S1 through S4 are needed to invert every<br />

second sine half-wave to arrive at AC. If using voltage sources with such voltages that<br />

they can sum up with the peak voltage of the desired AC output as<br />

n∑<br />

V i = 1.1 √ 2V AC = 358 Volts<br />

i=1<br />

for 230 V AC (+10% tolerance)

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