center-tapped transformer?

Question

what is center tapped transformer? why we should use in the center tapped rectifier and no need to use it in the bridge rectifier??

Answer 1

A center tapped transformer has wire that comes out of the middle of the secondary. It's typically grounded and then the outer wires of the transformer have signals that are out of phase but referenced to ground because of the center tap. the allows the rectifier to operate as a full wave rectifier ... output on both half cycles of the a.c. waveform and makes filtering much easier.

http://en.wikipedia.org/wiki/Center_tap

Answer 2

A center tapped transformer is one with three leads out the secondary side, the third one connected to the coils in the middle between the other two leads. If the transformer has the same number of coils on primary and secondary as another without the center tap, then the voltage from the center to the ends is half that of the regular one.
Since the voltage swings on the output, relative to the center are opposite, you only need one diode per side (center tapped rectifier) to get continuous DC, unlike with only two leads where a bridge with 4 diodes, 2 per side is needed to keep from getting pulsed DC that is off for half the cycle.
If the transformer is a common size, it will probably be cheaper to implement the center tapped. Fewer parts, fewer heat sinks, etc.

Answer 3

Centre tapped transformer is a transformer that provides a gnd and positive and negative
we use it in full wave coz it needs double voltage than bridge
while bridge gives the same output as full wave with less input

Answer 4

You can use a simpler two diode arrangement to get DC but it uses a bigger transformer to get the same power out. When diodes were expensive and unreliable this was a good idea. Now diodes are cheap and very reliable it doesn't make sense to waste money on the transformer.

Answer 5

the ac of 12V wiil have a height of sixteen.8V. So complete wave rectified output with a clear out capacitor of say 330uF would be approximately 15V. make particular. elect capacitor as 2000uF in line with amp. So for 330uF, draw a present day of 150ma dc and spot ripple voltage in meter. it can be a pair of million.a million to a million.3V. comparable to pp of three to 3.5V. boost capacitor to 2 times its value, and for same load present day, the ripple gets halved. elect voltage score of capacitor as a minimum of 25V.

Answer 6

if we input 240v in the centre-tapped transformer , it is divided the voltage into 120v & 120v but different frequency.