Answer / Chaina Khatoon

A 3φ semi-converter is a power electronic converter that converts an AC input to a DC output by utilizing three bridge rectifiers. The working principle involves transforming the input voltage to a full wave rectified AC, then chopping it with a thyristor to produce a pulsating DC output. The average output voltage Vavg and rms output voltage Vrms can be derived as follows:
Vavg = (2/π) * Vin * sqrt(2), where Vin is the RMS input voltage.
Vrms = √[(8 / π²) * (Vin²)]

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