Electronics and Communication Engineering - Power Electronics
Exercise : Power Electronics - Section 8
31.
A fully controlled bridge converter is feeding an RLE load. The load current is I0. The input voltage is Vm sin ωt. The KVL equation to find firing angle a is
cos a = E + I0R
cos a = E + I0R cos a = E - I0R cos a = E - I0R32.
A single phase cycloconverter with centre tapped input transformer requires
33.
The duty cycle of a step down chopper is
34.
In a 3 phase bridge inverter with 120° mode of operation the. number of thyristors conducting at one time are
35.
A rectifier is fed by a transformer. The rms voltage and current at secondary of transformer are Vs and Is. Output dc power is Vdc Idc and output ac power is (Vrms ) (Irms), Transformer utilisation factor TUF is
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