Variation of average output voltageas a functionof firing angle
Variation of average o/p voltageas a function of firing angle:
- The expression of i0 should be found out:
- In addition to the average component, the output voltage (and current) contains a large number of harmonic components. The minimum harmonic voltage frequency is twice the input supply frequency.
- The Fourier series representation of the load current can be obtained from the load voltage by applying superposition principle in the same way as in the case of a fully controlled converter.
Questions of this topic
A single phase half controlled converter is used to supply the field winding of a separately excited dc machine. With the rated armature voltage the motor operates at the rated no load speed for a firing angle= 0 degrees Find the value of firing angle which will increase the motor no load speed by 30 percentage. Neglect lasses and saturation. Assume continuous conduction.