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1. DEPARTMENT OF ELECTRICALAND ELECTRONICS ENGINEERING
PUDUCHERRY TECHNOLOGICAL UNIVERSITY
Puducherry-605014, India
Project Title
DEVELOPMENT OF SINGLE INPUT DUAL OUTPUT DC-DC CONVERTER USING
PI-CONTROLLER
Project Guide
Dr. P. Ajay D Vimal Raj, Associate Professor, EEE
Project Members
Sl.No. Reg. No. Name
1 20EE1020 ILANTHIRAIYAN V
2 20EE1036 NIRMAL M
3 20EE1037 PAVENDHAN T
4 20EE1039 POTHABATHULA LAKSHMI SRINIVAS
5 20EE1054 SURJITH R
1
2. CONTENT
โข INTRODUCTION
โข OBJECTIVE
โข EXISTING WORK
โข BLOCK DIAGRAM
โข IMPLEMENTED WORK
โข DESIGN VALUES
โข PI-CONTROLLER DESIGN
โข OPEN LOOPANALYSIS
โข CLOSED LOOP ANALYSIS
โข WORK PLAN
โข CONCLUSION
2
3. Introduction
โ A single-input, dual-output (SIDO) DC-DC converter is a type of power
electronics circuit that takes a single input voltage and concurrently generates
dual output voltages.
โ The loads are isolated in SIDO converters; therefore, they can regulate the
output voltage independently.
โ This type of converter is commonly used in applications where multiple
voltage rails are required, such as automotive electronics, embedded
systems, renewable energy systems, etc..
4. Objective
โข To eliminate the cross regulation problem that exist in the conventional
approach.
โข To design the single input dual output DC -DC converter using PI controller
that can obtain the desired output voltage level using simulink in MATLAB.
โข To implement the SIDO DC-DC converter using PI controller in Prototype
module.
5. EXISTING WORK
๏ถ The SIDO DC-DC converter generates two outputs: one is boost, and another is
buck-boost.
๏ถ The main flaw in this conventional approach is the cross-regulation problem,
and the loads are not being isolated from each other while they are operating.
๏ถ If the ground is implicated, there is a possibility of grounding problems when
charging the battery while concurrently turning on loads.
8. DESIGN VALUES
INPUT VOLTAGE(๐ฃ๐๐) = 24V
SWITCHING FREQUENCY(๐๐ )=50KHz
BOOST CONVERTER
๐
๐๐๐ = ๐
๐/2
1.Inductance
L =2๐ ๐ฟ๐๐๐ฅ/27๐๐
=2*337.5/27*50000
L1 = 0.5*10โ3
H
2.Capacitance
C =๐ท๐๐๐ฅ โ ๐01/๐
๐๐๐* ๐ ๐ฟ๐๐๐ฅ* ๐๐
=0.9*240/0.1*337.5*50000
C1 = 128*10โ6
F
๐01= ๐๐๐/(1 โ D)
BUCK-BOOST CONVERTER
๐
๐๐๐ = ๐
๐/2
1.Inductance
L = ๐ ๐ฟ๐๐๐ฅ โ (1 โ ๐ท๐๐๐)/2๐๐
= 111.53(1-0.1)/2*50000
L2 = 1*10โ3
H
2.Capacitance
C =๐ท๐๐๐ฅ โ ๐02/๐
๐๐๐* ๐ ๐ฟ๐๐๐ฅ* ๐๐
=0.9*216/0.1*111.53*50000
C2 = 348*10โ6
F
๐02= ๐๐๐ โ D/(1 โ D)
INDUCTANCE(L) CAPACITANCE(C)
L1 = 0.5*10โ3
H C1 = 128*10โ6
F
L2 = 1*10โ3
H C2 = 348*10โ6
F
9. DESIGN OF PROPORTIONAL AND INTEGRAL GAIN: Ziegler- Nichols Method
TYPE OF CONTROLLER ๐พ๐ ๐๐ ๐๐
PI 0.45๐พ๐๐ 1/1.2๐c๐ 0
๐พ๐๐=0.0011
๐พ๐=0.0005
๐c๐=0.0022s
๐๐=0.00183
๐พ๐ = K
๐พ๐ = K/๐๐
๐พ๐ = 0.2
๐พ๐=0.0005
Therefore, proportional gain and integral gain ๐พ๐ = 0.2
Where,
๐พ๐๐ โ Critical gain
๐c๐ โ Critical period
๐พ๐ โ Proportional gain
๐พ๐ โ Integral gain
๐๐ โ Integral time
10. OPEN LOOP SIMULATION RESULTS
Duty ratio
Boost Buck-Boost
Output(๐ฝ๐) Ripple Output(๐ฝ๐) Ripple
16. WORK PLAN
SI.NO WORK
TIME LINE STATUS
1.
Finalizing the project title and base paper. 2 weeks Completed
2. Preparing literature paper survey. 1 week Completed
3. To design a simulation model for SIDO dc-dc converter. 2 weeks Completed
4. Analyze the performance with open loop control. 1 week Completed
5. To design PI-controller in MATLAB-Simulink. 1 week Completed
6. Analyze the performance in closed loop control using PI-controller 1 week Completed
7. Study about components needed for prototype module. 1 week
8. Hardware implementation of closed loop control 3 weeks
9. Result analysis and conclusion of project 2 weeks
10. Final report preparation 2 weeks
17. CONCLUSION
๏ถ The implemented SIDO DC - DC converter structure can generate boost and buck-boost
output voltages with independent regulated voltage.
๏ถ In Improved DC-DC converter, the energy stored in the inductor is confined to one output
only and is not shared with other outputs.
๏ถ During control the loads are segregated from one another, and the cross regulation
problem is successfully resolved. So, the output voltages are unaffected by sudden
changes in inductor and load currents .
๏ถ It permits to regulating the output voltages with independent duty-cycle.
๏ถ With the help of PI-CONTROLLER the desired output voltage can be obtained.