Equipment Used for Rectification Process
The following items of equipment are used in rectifier circuits for assisting in the rectification process.
Transformers are attached to the rectifier circuit as they help in bringing the alternating current (A.C) voltage down to the required level. With the help of the transformer, the alternating current (A.C) voltage can be increased or decreased with a small amount of power loss. Moreover, transformers also help in increasing the safety of the equipment being used.
PN diodes are also used for the rectification process along with the transformers. PN diodes help in getting a better rectification of current. The diodes are generally attached in a separate circuit having one, two, or four diodes. The output result is a unidirectional direct current, smooth in quality.
A single rectifier can only produce a half-wave rectification, which though unidirectional, is not continuous in flow and has several ripples in it. In order to reduce these ripples in the direct current, a capacitor is used. Thus, a capacitor helps in smoothing the alternative current (A.C) voltage after the rectification process.
Also, for getting a full wave rectification, two diodes are attached in a circuit. This type of circuit is known as a bridge rectifier. However, in a two diode system, high voltage transformer is needed, which is expensive that the cost of a conventional bridge rectifier.
The number of rectifiers used in a circuit depends on the kind of output required. Higher the number of rectifiers used, better is the quality of rectified output voltage. There are several other methods for the rectification process; however, the above mentioned are the most commonly used ones.