CrazyEngineers Archive
Old, but evergreen and popular discussions on CrazyEngineers, presented to you in read-only mode.
@Prajakta Kelapure • 12 Oct, 2016
The rectifiers are broadly classified into two types viz:

Half Wave rectifier and Full wave rectifier.

Lets discuss Half Wave rectifiers today.

Circuit of Half wave rectifier:

1. It basically consist of the diode.As we already know that the diode is the two terminal device, consisting of the cathode and the anode, thus it allows the flow of electrons in only one direction.
2. It consist of the load element RL .
3. The diode is connected in series with the secondary of the transformer and the load element RL.
4. The primary of the transformer is connected to AC mains of the supply.

The half wave rectifier converts this AC voltage or alternating voltage into unidirectional pulsating voltage of half of the pulsating cycle . the other half is suppressed since the diode conducts only in one direction.

Operation:

1. We know that the AC voltage changes its polarity during every half cycle.

2. During the positive half cycle the upper end of the secondary is positive, the diode is forward biased and thus the diode conducts. And hence the current flow for that positive half cycle. This positive half cycle is then applied to the load element RL . The waveforms of the output current and voltage are of the same shape as that of the input positive wave.

Positive half ------- forward biased diode ------- output is positive half

3. During the other half i.e. negative half cycle of the AC input the upper end of the secondary is negative with respect to the lower end. Hence the diode is reversed biased. Thus during the negative half cycle, the diode does not conduct, so the current and the voltage remains zero.

Negative half ------ reversed biased diode ---------- output is Zero.

4. Thus if we see the waveform of the half wave rectifiers, its clearly seen that it conducts only for the positive half of the cycle. And for the other half the output is zero. Since is rectifies only half of the input , it is called half wave rectification.

1. It’s a simple circuit easy to construct.
2. It’s very cheap.

1. Since its ripple factor is very high , thus a big filtering circuit is required.
2. The efficiency is very low since output is delivered only for half the time.
3. Transformation Utilization factor is low.
4. Saturation of the transformer core results in hysteresis losses.

Because of its demerits it cannot be used for general power supply but can be use for charging of some kind of batteries.

Characteristics of Half wave rectifier are tabulated as under -

6.2k views

## Related Posts

@Ankita Katdare · Oct 8, 2015

It's official. The homegrown brand Micromax has entered the laptop segment with the all new Canvas Lapbook. And this time it's not a 2-in-1 tablet convertible. It's a full bloom...
6.1k views

@Ankita Katdare · Sep 16, 2014

Sony India has launched a new smartphone - the Sony Xperia E3 and its Dual-SIM variant in India today after the grand unveiling at IFA 2014. You will find that...
10.6k views

@Kaustubh Katdare · Jul 5, 2013

Karbonn Titanium S9 has been launched in India with a price tag of Rs. 19,990. The Titanium S9 makes an interesting launch from Karbonn mobiles and the timing of the...
4.3k views

@CIVILPRINCESS · Nov 30, 2009

civil engineering viva questions for IInd years hi all, This thread is a compilations of the Viva questions the civil engineering students may face during the viva sessions. Please enlist...
14.2k views

@Kaustubh Katdare · Oct 8, 2013

Google India is in talks with several Direct To Home (DTH) operators in India to deliver YouTube videos directly to your television sets. Francisco Varela, who heads platform partnerships at...
3.6k views