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Transcript of multifunction power supply for embedded system
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MULTIFUNCTON POWER SUPPLY
Submitted by: Under the
guidance of:
Prabhat Kumar Patel Prof. S. S. SharmaVijay Laxmi Sahu
Samay Nath Shukla
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CONTENTS
Introduction
Basic components
Component description
Designing consideration Circuit diagram
Working
Advantages and Scope
Conclusion
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INTRODUCTION
There are many system which requires a constant voltage supply for
their working with some additional features to perform reliable operation. This
type of multifunction power supply can be used to provide a constant voltage
which involves special features like:
Power fail detection
Zero cross signal for main power supply
Inbuilt battery back-up
In case of power failure, there is an inbuilt battery which comes into
action.
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Components
Step-down transformer (230/12V)
LM317 IC (adjustable voltage regulator)
LM7805 IC (5V voltage regulator)
74HC14 (hex inverter schmitt trigger)
bridge rectifiers
Zener diode LED
Resistor and Capacitor
Connectors
Fuse
On/off switch
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Components description
1) LM317 ICIt is an adjustable 3 terminal positive voltage regulator over an output voltage
range of 1.2V to 37V.
The output voltage equation for regulator is
Vout
= 1.25Vin
(1+ R2/R
1) + IR
2
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2) LM7805 IC
It is a fixed voltage regulator which gives a constant output voltage
of +5V.
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3) 74HC14
it provides 6 inverting buffer with Schmitt trigger. Basically Schmitt trigger
is an inverting comparator with positive feedback. This converts an irregular shapedwaveform to a square wave or pulse.
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4) Bridge Rectifier
It is used for the conversion of AC supply into DC.
5) Zener diode
It is used for maintaining a constant voltage when it is in saturation
region.
6) Other components
Resistor, capacitor, LED, fuse, step-down transformer etc are also used for the
purpose of different functions along with protection of this power supply.
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Designing Consideration
Bridge Rectifier : BR1= 2.5Amp , BR2= 1Amp
Zener Diode: ZD1= 4.7V , ZD2= 7.5V
Resistors : R1= 200ohm , R2,R3,R5= 1kilo-ohm , R4= 700ohm ,
R6= 500ohm , R7= 10ohm , R8= 200ohm ,
R9,R10,R11,R12= 1kilo-ohm
Capacitors : C1= 100nF , C2= 10nF , C3,C5,C7= 0.33uF ,
C4= 4700uF , C6= 1nF , C8= 220uF
Miscellaneous: S1on/off switchF1- 2.5A fuse
F2- 1A fuse
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CIRCUIT DIAGRAM
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WORKING
The mains power supply of 230V AC is step down to 12V by the step down
transformer. The RC components connected across the supply prevents noise to
enter, which may come from supply side.
The secondary output of the transformer is fed to the two bridges BR1 and BR2
and output of approx. 10.8V is obtained.
10.8V obtained is given as input to IC1 LM317 and IC2 7805. IC2 gives us
constant power supply of +5 volts and the O/P of IC1 can be adjusted using the
potmeter1, to supply power to battery for charging purpose .
This charged battery can be utilized to give power to some components ofembedded system during the power failure.
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Working continued.
Now the question is how we know that power failure hasoccurred?
Transistoris used to solve out this problem but thetransistor should be specifically of switching type .
During the normal state +10volts supplies to the transistor and since the
threshold of zener is 7.5V, for the value of voltage above than this zener is in
on state and the output is 0 volts but when the power failsvoltage at TP2 falls
below 10V and transistor stops conducting and CON5 provides high signal
at pin3.
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ZERO CROSSING DETECTION
The outputs from pins 2, 3 and 4 of connector CON6 provide different
signals with a frequency that is double the frequency of the mains power supply
(100 Hz). These signals are active near zero crossings of the mains power supply
and can be used for several purposes, such as:
1. The control unit can use them to measure the frequency of the mains power
supply.
2. These can be used to synchronise the operation of the control unit with zero
crossings of the mains power supply.
3. he amplitude of signal TP4 is proportional to the secondary voltage of the
transformer. The control unit can measure it and determine the secondary voltageof X1.
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ADVANTAGES
The components used are popular low cost components withother facilities of :
+5V output
battery charger
zero crossing signal
power fail detection
SCOPE
Since the circuit is cost efficient due to use of low cost
components and it is performing multiple functions so it can be utilized inembedded system to perform reliable and stable operation.
.
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CONCLUSION
Since the circuit design and configuration is best for those type ofsystem which requires +5V constant supply and where failure of power
supply should not effect the working which may causes undesirable
effects so we will ultimately improve our control and performance of
embedded system.
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Thank You