ESD Lab Manual Anna University Coimbatore

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Experiments
AU EDC Lab Manual
1. REGULATION CHARACTERISTICS OF
BUCK –BOOST CONVERTER
2. REGULATION CHARACTERISTICS OF
FLYBACK CONVERTER
3 (i) DESIGN OF AM TRANSCEIVER
3 (ii) DESIGN OF FM TRANSCEIVER
4. DESIGN OF WIRELESS DATA MODEM.
5. PCB LAYOUT DESIGN USING CAD
6. DESIGN OF DC VOLTAGE REGULATOR
USING SCR
7. MICROCONTROLLER BASED SYSTEM
DESIGN.
8. DESIGN OF PROCESS CONTROL TIMER
9. DESIGN OF INSTRUMENTATION AMPLIFIER
10. DSP BASED DIGITAL FUNCTION GENERATOR
11. SIMULATION OF DC VOLTAGE REGULATOR
USING SCR
12. SIMULATION OF AC VOLTAGE CONTROLLER
USING SCR
REGULATION CHARACTERISTICS OF BUCKBOOST
CONVERTER
EXPT NO: 1
AIM:
To determine the closed loop response of the Buck-Boost converter and plot the
regulation characteristics.
APPARATUS REQUIRED:
1. VSMPS-07A Trainer
2. Pulse patch chords
3. (0-30V) DC supply
4. CRO
FORMULA:
Output voltage V0 = (-D / 1-D) Vs Volts
Where V0 = Converter Output Voltage, Volts
Vs = Converter input voltage, volts
D = Duty Cycle (ton / T)
THEORY:
The Buck Boost is a popular non-isolated, inverting power stage topology,
sometimes called a step up/down power stage. The Buck boost power stage is chosen
because the output voltage is inverted from the input voltage and the output voltage can
be either higher or lower than the input voltage. However the output voltage is opposite
in polarity from the input voltage. The Buck Boost converter circuit consist of MOSFET
switch Q, inductor L, diode D, filter capacitor C and load resistor R.
CONNECTION PROCEDURE:
Connect P8 of PWM generator to PWM input of Buck-Boost converter
circuit.
Connect P4 of Buck-Boost converter circuit to P7 of PWM generator.
Set switch SW1 to downward direction to select the closed loop operation.
EXPERIMENTAL PROCEDURE:
A) Line Regulation:
Switch ON the AC power supply and the power ON/OFF switch of the
trainer kit.
View the carrier signal in CRO at T3.
Set the switch SW1 in downward direction.
Set the switch SW2 in downward direction.
View the PWM signal in CRO at T1.
Vary the Set voltage adjust POT from minimum to maximum and note
down the ton and T values.
Set the PWM signal at desired duty cycle ratio (maximum 50%).
Switch ON the variable DC supply.
Vary the input voltage from (0-15) V and note down the corresponding
output voltage across P5 and P6.
For each input voltage value tabulate the measured output voltage values.
Set the switch SW2 in upward direction and repeat the same procedure for
Buck converter.
TABULATION (BUCK MODE):
A) Line Regulation:
S.No Input Voltage (Volts) Output Voltage (Volts)
B) Load Regulation:
S.No Load Resistor
()
Load Current
(mA)
Output Voltage
(Volts)
TABULATION (BOOST MODE):
A) Line Regulation:
S.No Input Voltage (Volts) Output Voltage (Volts)
B) Load Regulation:
S.No Load
Resistor ()
Load Current
(mA)
Output Voltage
(Volts)
b) Load Regulation:
Switch ON the AC power supply and the power ON/OFF switch of the
trainer kit.
View the carrier signal in CRO at T3.
Set the switch SW1 in downward direction.
Set the switch SW2 in downward direction.
View the PWM signal in CRO at T1.
Vary the Set voltage adjust POT from minimum to maximum and note
down the ton and T values.
Set the PWM signal at desired duty cycle ratio (maximum 50%).
Switch ON the variable DC supply.
Set the input to a constant value and vary the load resistor value, note
down the corresponding output voltage across P5 and P6 output terminals
of trainer module..
For each load resistor value tabulate the measured output voltage values.
Set the switch SW2 in upward direction and repeat the same procedure for
Buck converter.
RESULT:
Thus the closed loop response for Boost/Buck operation of Buck-Boost converter
of Line/Load regulation was determined.
1. The output voltage is maintained at ------ V with the input voltage from
------- V to ---------- V for boost mode of operation.
2. The output voltage is maintained at ------ V with the input voltage from
------- V to ---------- V for buck mode of operation.
REGULATION CHARACTERISTICS OF FLYBACK
CONVERTER
EXPT NO: 2
AIM:
To determine the closed loop response of the Flyback converter and plot the
regulation characteristics.
APPARATUS REQUIRED:
5. VSMPS-09A Trainer
6. Pulse patch chords
7. (0-30V) DC supply
8. CRO
FORMULA:
Output voltage V0 = (D / 1-D)(N2/N1) Vs Volts
Where V0 = Converter Output Voltage, Volts
Vs = Converter input voltage,volts
D = Duty Cycle (tON / T)
N2 / N1 = Transformer turns ratio.
THEORY :
The flyback converter is a negative output step-up converter (i.e) it is an isolated
version of the buck-boost converter. The inductor of buck-boost converter has been
replaced by a flyback transformer. The input dc source Vs and switch Q are connected in
series with the transformer primary. The diode D and the RC output circuit are connected
in series with the secondary of flyback transformer. The circuit diagram of flyback
converter is shown below.

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