Rectifier is a device which
converts alternate current into direct current.The PN junction diode can act like
a rectifier. There are two types of rectifiers. One is a full wave rectifier and
another one is a half wave rectifier.
Half wave rectifier :
The device which converts half of the input
alternate current into direct current is
called a half wave rectifier. Then input is given generally from a step down transformer
which has a primary and secondary coils and in between them there is a soft core.
The output of the step down transformer is connected to a diode as shown in the figure. When the
diode is in the forward biased the alternate current will be converted into
direct current and when it is in the reverse biased it is not going to allow
the current passing through it.
Anyway the converted
direct current is not a complete direct current but still it will be having
some sort of alternate current components. This is the reason why the output is
still shown with the small kind of waves.To eliminate the remaining the
alternate current we need to use filter circuit which is a combination of
capacitors and resisters.
Efficiency means the ratio of portion of
the output that is converted into direct current when compared with the input
alternate current given. The half wave rectifier is theoretically supposed have
efficiency of 50%. Anyway because of the remaining alternate current components
and output it is having an efficiency close to 40.6% . This is also possible
only when the diode in the forward bias. In that case, ideal diode offers zero resistance.
.jpg)
Distance and displacement comparison
No comments:
Post a Comment