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The conversion of ac to dc is known as rectification.
It combines the features of both controlled rectifiers (using SCR) and uncontrolled rectifiers (using diodes). The polarity of output voltage can be either positive ornegative.
It is the process of turning-off of a power semiconductor device.
4. Freewheeling diode:
A power diode connected parallel across the load to prevent the reversal of load voltage in order to improve the input power factor.
AC component present in the DC output voltage.
6. Delay angle:
It is defined as the angle between the zero crossing of the input voltage and the instant the thyristors is fired.
7. Overlap period:
The period during which both the incoming and outgoing thyristors conducts simultaneously is called overlap period.
8. Overlap angle/ commutation angle:
The angle for which both devices share conduction is known as overlap angle.
9. Input Displacement Angle:
It is the angular displacement between the fundamental component current to the line to neutral voltage of the input ac source.
10. Displacement factor:
It is defined as the cosine of the input displacement angle.
11. Distortion factor:
It is defined as the ratio of RMS amplitude of the fundamental component to the total RMS amplitude.
12. Harmonic Factor:
It is defined as the ratio of the total harmonic content to the fundamental component.
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