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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
➢ OPEN LOOPANALYSIS
➢ CLOSED LOOP ANALYSIS
➢ WORK PLAN
➢ CONCLUSION
2

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.
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6. + -
𝐾𝑝
𝑘𝑖
𝛴
+
+
Set
point DC-DC Converter
LOAD
K
PWM
K
PI-CONTROLLER
Feedback Gain
DC-LOAD
𝑽𝟎
𝑽𝟎
ERROR
BLOCK DIAGRAM
6

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

8. DESIGN VALUES
INPUT VOLTAGE(𝑣𝑖𝑛) = 24V
SWITCHING FREQUENCY(𝑓𝑠)=50KHz
BOOST CONVERTER
𝑉
𝑐𝑝𝑝 = 𝑉
𝑟/2
1.Inductance
L =2𝑅𝐿𝑚𝑎𝑥/27𝑓𝑠
=2*337.5/27*50000
L1 = 0.5*10−3
H
2.Capacitance
C =𝐷𝑚𝑎𝑥 ∗ 𝑉01/𝑉
𝑐𝑝𝑝* 𝑅𝐿𝑚𝑎𝑥* 𝑓𝑠
=0.9*240/0.1*337.5*50000
C1 = 128*10−6
F
𝑉01= 𝑉𝑖𝑛/(1 − D)
BUCK-BOOST CONVERTER
𝑉
𝑐𝑝𝑝 = 𝑉
𝑟/2
1.Inductance
L = 𝑅𝐿𝑚𝑎𝑥 ∗ (1 − 𝐷𝑚𝑖𝑛)/2𝑓𝑠
= 111.53(1-0.1)/2*50000
L2 = 1*10−3
H
2.Capacitance
C =𝐷𝑚𝑎𝑥 ∗ 𝑉02/𝑉
𝑐𝑝𝑝* 𝑅𝐿𝑚𝑎𝑥* 𝑓𝑠
=0.9*216/0.1*111.53*50000
C2 = 348*10−6
F
𝑉02= 𝑉𝑖𝑛 ∗ D/(1 − D)
INDUCTANCE(L) CAPACITANCE(C)
L1 = 0.5*10−3
H C1 = 128*10−6
F
L2 = 1*10−3
H C2 = 348*10−6
F
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9. DESIGN OF PROPORTIONAL AND INTEGRAL GAIN: Ziegler- Nichols Method
TYPE OF CONTROLLER 𝐾𝑝 𝑇𝑖 𝑇𝑑
PI 0.45𝐾𝑐𝑟 1/1.2𝑃c𝑟 0
𝐾𝑐𝑟=0.0011
𝐾𝑝=0.0005
𝑃c𝑟=0.0022s
𝑇𝑖=0.00183
𝐾𝑝 = K
𝐾𝑖 = K/𝑇𝑖
𝐾𝑖 = 0.2
𝐾𝑝=0.0005
Therefore, proportional gain and integral gain 𝐾𝑖 = 0.2
Where,
𝐾𝑐𝑟 ⇒ Critical gain
𝑃c𝑟 ⇒ Critical period
𝐾𝑝 ⇒ Proportional gain
𝐾𝑖 ⇒ Integral gain
𝑇𝑖 ⇒ Integral time
9

10. OPEN LOOP SIMULATION RESULTS
Duty ratio
Boost Buck-Boost
Output(𝑽𝟎) Ripple Output(𝑽𝟎) Ripple
0.1 25.86 0.007 1.96 0.00065
0.2 29.19 0.02 5.39 0.0017
0.3 33.46 0.03 9.47 0.004
0.4 39.14 0.05 15.29 0.008
0.5 47.06 0.08 23.81 0.015
0.6 58.82 0.12 34.9 0.022
0.7 78.03 0.27 54.34 0.04
0.8 116.7 0.3 94.48 0.08
0.9 235.7 0.55 210.9 0.18
OPEN LOOPANALYSIS
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11. OPEN LOOP WAVE FORMS
 BOOST CONVERTER
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12.  BUCK-BOOST CONVERTER
12

13. CLOSED LOOPANALYSIS
CLOSED LOOP SIMULATION RESULTS
LOAD
Boost Buck-Boost
Output(𝑽𝟎) Ripple Output(𝑽𝟎) Ripple
50 Ω 200 0.98 150 0.3
60 Ω 200 0.89 150 0.26
70 Ω 200 0.8 150 0.2
80 Ω 200 0.63 150 0.18
90 Ω 200 0.6 150 0.11
100 Ω 200 0.5 150 0.098
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14. CLOSED LOOP WAVE FORMS
 BOOST CONVERTER
14

15.  BUCK-BOOST CONVERTER
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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
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17. 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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