Answers
Unit 6, Assignment 5 - Single Phase AC (D1)
- Course
- Institution
BTEC Engineering Level 3
[Show more]
Seller
Follow
misterf
Reviews received
Content preview
Unit 6 Single Phase AC Assignment 5A p-n junction diode connected in series to the load resistor is
essentially a half way rectifier. With the diagrams below, we can
see an alternating current as the input; the input voltage is
displayed as a step down transformer & the resultant is a reduced
output of the transformer that gives to the diode & load resistor.
The next diagram displays a half wave rectifier with an inclusion of a capacitor, which
produces a smoother output. Essentially, a greater load current will discharge the capacitor
rapidly, which upsurges the amount of ripples gained. However, in a half way rectifier circuit,
it’s not really useful to reduce the ripple voltage by smoothing the capacitor, but, it’ll be most
beneficial in a full wave rectifier.
The raw DC delivered by a rectifier on its own would consist of a sequence of half sine waves
with the voltage altering between zero and √2 times the RMS voltage; but this does not
include any diodes & other losses. Furthermore, a supply of this type wouldn’t be much use
for powering circuits due to the fact that analogue circuits would contain a large level of
ripples that are covered on the output, & digital circuits wouldn’t be able to work as the
power is removed every time there is a half cycle.
To smooth the output of the rectifier a reservoir capacitor is used which is placed across the
output of the reciter & is parallel with the load; Normally, the capacitor charges up when the
voltage from the rectifier
rises above that of the
capacitor & as the
rectifier voltage depletes,
the capacitor offers the
required current that
comes from its stored
charge.
The diagram on the left is a full
wave rectifier circuit that
consists of 4 diodes that are
arranged in series pairs with only
2 diodes conducting current
during ever half cycle. So, during
the positive half cycle, the diodes
that are pointing downwards
(Diodes 1 & 2) conduct in series,
whereas the other diodes
pointing in the right hand side
direction (Diodes 3 & 4) are
reversed biased & the current
flows through the load.
During the negative half cycle, diodes 3 & 4 now conduct in series, however diodes 1 & 2 are
switched off since they’re now reverse biased; the direction of the current flowing through the
load is unchanged. As the current flows through the load, the path is only in one direction, so
the voltage created across the load is also in one direction, which is the same for the last 2
diodes in the full wave rectifier.
D1 Fahim Mohammed
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller misterf. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $3.86. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
53068 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now