Conversion
of AC to DC is very important for electrical purposes. The conversion
involves a lot of steps such as determining Ac input voltage,
deducing voltage and current needed, and converting the high-voltage
Ac to Low-Voltage AC. Then pass the low voltage AC through a
rectifier, smooth out the voltage using a large electrolytic
capacitor, and pass the output of the smoother through a regulator.
The PE Exam Prep Course helps in learning the conversion process.
Direct
Current has a variety of applications and advantages in the
electrical field. So, it is important to convert alternating current
to direct current for a variety of purposes.
Determine AC Input Voltage:
In Central,
South, and North America the AC voltage coming out of the sockets is
110 Volts to 120 Volts and the frequency of operation is 60 Hertz. In
Asia, Australia, Middle East, Europe, and Africa, the voltage range
is 230 volts to 240 volts and the frequency of operation is 50 Hertz.
The standards may vary in other regions. While preparing for the PE
Exam you will know how to determine the AC input voltage.
Deduce
the Voltage and Current Needed:
Verify
the manufacturer’s manual for current and voltage settings. If the
voltage or current is too high it will destroy the components. If the
voltage or current is too low, then the device will not work
properly. There is a range of voltage and current that is advised for
safe working. Make sure you operate somewhere in the middle of the
given range.
Convert
the High-Voltage AC to Low-Voltage AC:
The
High Voltage can be converted to low voltage by passing through a
step-down transformer. Electrical current in the primary of the
transformer induces a current in the secondary. The secondary has
fewer coils and so the voltage is lesser. However, this reduction in
voltage is compensated by an increase in current. Hence, the power
output remains the same. The PE Exam Prep helps you in learning the
use of step-down transformer in AC to DC conversion.
Pass
the low-voltage AC through a rectifier:
One
type of rectifiers used is a Bridge Rectifier.
The Bridge Rectifier consists of
four diodes arranged in the shape of a diamond.
A diode allows current to flow in
only one direction. In the diamond configuration of Bridge rectifier,
two diodes will conduct for the positive half and the remaining two
diodes will conduct for the negative half. The output of both sets is
a current that climbs from 0 volts to the maximum positive voltage.
Smooth
out the Voltage:
A capacitor
stores an electric charge for a short time and then slowly releases
it. The input from the rectifier resembles a string of humps; the
output of the "smoothing capacitor" is a steady voltage
with ripples.
For devices
that only need a low current, you can create a regulator with a
resistor and a Zener Diode. This arrangement is designed to break
down when a certain voltage is reached, allowing current to pass
through it. The resistor limits the current. The PE Exam Prep Course helps
in knowing the need for electrolytic capacitor.
Pass the
output through a regulator:
This final
regulator will smooth the ripples and creates a steady current. This
smooth current ensures that your electronic device is not damaged.
Regulators are ICs that can have
either a fixed or variable output voltage. The regulators come with
inbuilt protection against overheating. But a heat sink will protect
the regulator from overheating.
The
tendency of fluctuation in the current is known and expected
phenomena. The proper combination of transformer and rectifiers
ensure that AC to DC is achieved smoothly without sacrificing the
electronic devices using these currents.
The
importance of AC to DC conversion that helps to create DC circuits,
which is one of the topics of NCEES Electrical PE Exam. But the main
challenge lies creating a DC circuit that will not get overloaded or
tripped in the process. You can prepare for this topic with a PE Exam
Prep Course.
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