Three single phase half wave converters can be connected to form a three-phase half wave converter. Similarly, three phase semi converter uses 3 SCRs T1, T3 & T5 and 3 diodes D2, D4& D6. R,Y,B are phase voltages with respect to ‘N’. In the circuit shown above when any device conducts, line voltage is applied across load. So, line voltage are necessary to draw Phase shift between two line voltages is 60 degree & between two phase voltages it is 120 degree Each phase & line voltage is sine wave with the frequency of 50 Hz. With purely resistive load current will be in phase with load voltage. Depending on value of firing angle, circuit can operate in two different modes. When α<60 T1 is triggered at α=30. SCR T1 and D6 conduct and line voltage RY is applied to the load from (π/6 +α) to π/2. 60. At π/2 ‘D2’ is more positive so conducts. Therefore, line voltage RB is applied to load. This continues up to firing of T3 at (π/6 +α )
For α≤60 the output voltage is continuous so-called continuous mode of operation. For α> 60 for some duration of time no device conducts so called discontinuous mode of operation.
Vijay (2021). Three-phase half controlled converter for R load by MATLAB (https://www.mathworks.com/matlabcentral/fileexchange/72195-three-phase-half-controlled-converter-for-r-load-by-matlab), MATLAB Central File Exchange. Retrieved .
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