In the 3-phase inverter circuit shown, the load is balanced and the gating scheme is 180°-conduction mode. All the switching devices are ideal. (Vd = 300 V)
The rms value of load phase voltage is
141.4 V
Concept:
Parameter | 180° conduction mode | 120° conduction mode |
|---|---|---|
Phase voltage (Vph) | \(\frac{{\sqrt 2 }}{3}{V_s}\) | \(\frac{{{V_s}}}{{\sqrt 6 }}\) |
Line voltage (VL) | \(\sqrt {\frac{2}{3}} {V_s}\) | \(\frac{{{V_s}}}{{\sqrt 2 }}\) |
RMS load current (Ior) | \(\frac{{\sqrt 2 }}{{3R}}{V_s}\) | \(\frac{{{V_s}}}{{\sqrt 6 R}}\) |
RMS thyristor current (ITr) | \(\frac{{{V_s}}}{{3R}}\) | \(\frac{{{V_s}}}{{2\sqrt 3 R}}\) |
Calculation:
A three-phase voltage source inverter supplying equivalent star load.
Equivalent star load resistance is,
\({R_{ph}} =20\;{\rm{\Omega }}\\ {V_{ph}} = \frac{{\sqrt 2 }}{3}{V_{dc}} = \frac{{\sqrt 2 }}{3} \times 300 = 200\sqrt 2 V = 141.42\;V\)
Important Questions from Inverters
Output voltage wave shape of a basic series inverter is
The output of SMPS is ______.
Which one of the following controls reduce the size of the transformer in a switch mode AC power supply?
If the dc bus voltage Vd = 300 V, the power consumed by 3-phase load is
In the interval when v0 < 0 and i0 > 0 the pair of devices which conducts the load current i
