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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
➢ INTRODUCTION
➢ OBJECTIVE
➢ EXISTING WORK
➢ BLOCK DIAGRAM
➢ IMPLEMENTED WORK
➢ DESIGN VALUES
➢ PI-CONTROLLER DESIGN
➢ BODE PLOT
➢ CLOSED LOOP ANALYSIS
➢ VOLTAGE MODE CONTROL
➢ HARDWARE RESULTS
➢ WORK PLAN
➢ CONCLUSION
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3. Introduction
❖ 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.
❖ The loads are isolated in SIDO converters; therefore, they can regulate the
output voltage independently.
❖ 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..
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4. Objective
➢ To eliminate the cross regulation problem that exist in the conventional
approach.
➢ 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.
➢ To implement the SIDO DC-DC converter using PI controller in Prototype
module.
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5. EXISTING WORK
❖ The SIDO DC-DC converter generates two outputs: one is boost, and another is
buck-boost.
❖ 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.
❖ If the ground is implicated, there is a possibility of grounding problems when
charging the battery while concurrently turning on loads.
5

6. + -
Set
point DC-DC Converter
LOAD
K
PWM
K
Feedback Gain
DC-LOAD
ERROR
BLOCK DIAGRAM
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PI-CONTROLLER

7. IMPLEMENTED WORK
1
2
BOOST CONVERTER BUCK-BOOST CONVERTER
PI-CONTROLL
ER
PI-CONTROLL
ER
SINGLE INPUT, DUAL OUTPUT DC-DC CONVERTER 7

8. DESIGN VALUES
INDUCTANCE(L) CAPACITANCE(C)
8

9. DESIGN OF PROPORTIONAL AND INTEGRAL GAIN: Ziegler- Nichols Method
TYPE OF CONTROLLER
PI 0
Therefore, proportional gain and integral gain
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10. SMALL SIGNAL MODELLING
▪ The above transfer function of the boost and buck-boost converter is used to plot the bode plot of the
system .
▪ The bode plot helps to verify the system stability. The obtained bode plot are added.
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11. BODE PLOT OF THE DEVELOPED CONVERTER
Boost converter
1

12. Buck-boost converter
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13. CLOSED LOOPANALYSIS
Ripple Voltage Boost
Ripple Voltage Buck-Boost
13

14. Closed Loop Wave Forms
Boost converter Buck-Boost converter
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15. Voltage Mode Control
Voltage mode control is a method used in power electronic converters to regulate the output voltage.
The differential voltage, which is obtained by compare the output voltage (feedback) with the reference
voltage by an error amp, is compared with triangular waves by a PWM generator.
As a result, the pulse width of the PWM signal is determined to control the output voltage.
This control technique is frequently used to maintain a constant output voltage despite variations in the
load or input voltages in applications like DC-DC converters.
In this voltage mode control ,a single feedback loop will help in making the design simple and easier.
15

16. FEEDBACK
+
-
CMP
+
_
Programmable Ramp
Generator
Voltage Mode Control Block Diagram
PWM
COG
ERROR SIGNAL
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17. Experimental Implementation
Boost Converter
Buck-Boost converter
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18. Experimental setup

19. HARDWARE RESULTS
BOOST CONVERTER
Voltage across Inductor
Voltage across switch Voltage across Diode
18

20. Buck-Boost converter
Voltage across Inductor
Voltage across Switch Voltage across Diode
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21. 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 Completed
8. Hardware implementation of closed loop control 3 weeks Completed
9. Result analysis and conclusion of project 2 weeks Completed
10. Final report preparation 2 weeks
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22. CONCLUSION
❖ The implemented SIDO DC - DC converter structure can generate boost and buck-boost
output voltages with independent regulated voltage.
❖ In Improved DC-DC converter, the energy stored in the inductor is confined to one output
only and is not shared with other outputs.
❖ 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 .
❖ It permits to regulating the output voltages with independent duty-cycle.
❖ With the help of PI-CONTROLLER the desired output voltage can be obtained.
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