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CEU Paper, M. Zahran, WSEAS PE' 07, Beijing - CHINA 1
Charge Equalization Unit for a NiCd Battery of Small Earth Observation
Satellite EPS Simulation
Dr. Mohamed Bayoumy A. ZahranDr. Mohamed Bayoumy A. ZahranAssoc. Prof. Researcher in Electronics Research Institute, &
Member in Space Program of National Authority for Remote Sensing and Space Science, SE and EPS GL of MisrSat-2,
Cairo - EGYPT
CEU Paper, M. Zahran, WSEAS PE' 07, Beijing - CHINA2
EPS Electrical Block Diagram
CEU Paper, M. Zahran, WSEAS PE' 07, Beijing - CHINA3
Functional Block Diagram of EPS
CEU Paper, M. Zahran, WSEAS PE' 07, Beijing - CHINA4
Why Charge Equalization Unit?
Protect the battery from critical modes of operation,
Help the weak cells to continue operation without deep discharging or reverse polarity,
Increase the battery lifetime, Move or shift the appearance
time of battery aging affects.
CEU Paper, M. Zahran, WSEAS PE' 07, Beijing - CHINA5
CEU Paper, M. Zahran, WSEAS PE' 07, Beijing - CHINA6
CEU Paper, M. Zahran, WSEAS PE' 07, Beijing - CHINA7
CEU Paper, M. Zahran, WSEAS PE' 07, Beijing - CHINA8
CEU Paper, M. Zahran, WSEAS PE' 07, Beijing - CHINA9
CEU Paper, M. Zahran, WSEAS PE' 07, Beijing - CHINA10
CEU Paper, M. Zahran, WSEAS PE' 07, Beijing - CHINA11
Survey of Charge Equalizer Techniques
CEU Paper, M. Zahran, WSEAS PE' 07, Beijing - CHINA12
Types of charge equalizers Dissipative Equalization
Techniques:1. Dissipative resistive shunts,2. Individual cell equalizer (ICE),3. Charge shunting,
Non-dissipative (dynamic) Equalization Techniques:
1. Flying Capacitor Charge Shuttling,
2. Charge Shuttling Between Two Cells,
3. Charge Shuttling with Several Cells,
ENERGY CONVERTERS:1. Switched Transformer,2. Charge equalization using isolated
flyback dc-to-dc converters,3. Charge equalization using bi-
directional isolated flyback dc-dc converters,
4. Shared transformer,5. Multiple Transformer,6. Charge equalization using a
centralized forward converter with a multi-winding transformer,
7. Reducing the number of secondary windings for the centralized forward converter scheme,
8. Current diverters using flyback converters with a centralized multi-winding transformer,
9. Current diverters using forward converters with a centralized
CEU Paper, M. Zahran, WSEAS PE' 07, Beijing - CHINA13
Dissipative charge equalizer
Dissipative resistive shunts
Individual cell equalizer
(ICE)
charge shunting
CEU Paper, M. Zahran, WSEAS PE' 07, Beijing - CHINA14
Non-dissipative (dynamic) Equalization Techniques
Flying Capacitor Charge Shuttling
Charge Shuttling Between Two Cells
Charge Shuttling with Several Cells
CEU Paper, M. Zahran, WSEAS PE' 07, Beijing - CHINA15
ENERGY CONVERTERS, Samples
Switched Transformer Charge equalization using isolated flyback dc-to-dc converter
Charge equalization using bi-directional isolated flyback dc-dc
converters
Shared transformer Multiple TransformerCharge equalization using a
centralized forward converter with a multi-winding transformer
CEU Paper, M. Zahran, WSEAS PE' 07, Beijing - CHINA16
Shared transformer Technique
CEU Paper, M. Zahran, WSEAS PE' 07, Beijing - CHINA17
Structure of CEU
CEU Paper, M. Zahran, WSEAS PE' 07, Beijing - CHINA18
1
Out1
v +-
Voltage Measurement
VRM-U
VRM-L
s -+
VRM Random Input VoltageVRM Output Voltage
VRM Output Current
VRM Monitoring
5
VRM Monitor
VCM MonitoringN/S
Red=black
12
VCM Monitor
VCM Input Voltage
VCM Input Current
Step1
Step
RandomNumber
Signal(s)Pulses
PWM Generator
1+
1
+2
2.1
2
Multi-WindingTransformer 9
1+
1
+2
2.1
2
Multi-WindingTransformer 8
1+
1
+2
2.1
2
Multi-WindingTransformer 7
1+
1
+2
2.1
2
Multi-WindingTransformer 12
1+
1
+2
2.1
2
Multi-WindingTransformer 11
1+
1
+2
2.1
2
Multi-WindingTransformer 10
gm
ds
Mosfet1
gm
ds
Mosfet Load
g
12
Ideal Switch
20
Gain1
-K-
Gain
Signal(s)Pulses
DiscretePWM Generator
Diode2
Diode1
Diode
CEU-6 Volt
CEU-6 I
CEU-5 Volt
CEU-5 I
CEU-4 Volt
CEU-4 I
CEU-3 Volt
CEU-3 I
CEU-2 Volt
CEU-2 I
CEU-1 Volt
CEU-1 I
Control Signal of CRMControl Signal of CRMControl Signal of CRMControl Signal of CRMControl Signal of CRMControl Signal of CRM
Control Signal of CRM
CEU Paper, M. Zahran, WSEAS PE' 07, Beijing - CHINA19
The VRM Results
CEU Paper, M. Zahran, WSEAS PE' 07, Beijing - CHINA20
The VCM Results 1/2
CEU Paper, M. Zahran, WSEAS PE' 07, Beijing - CHINA21
The VCM Results 2/2
CEU Paper, M. Zahran, WSEAS PE' 07, Beijing - CHINA22
CEU Simulink model and testing results with a resistive loading
CEU Paper, M. Zahran, WSEAS PE' 07, Beijing - CHINA23
CEU Simulink model and testing results with a battery cells loading
CEU Paper, M. Zahran, WSEAS PE' 07, Beijing - CHINA 24
CEU Power Circuit Design and Implementation
CEU Paper, M. Zahran, WSEAS PE' 07, Beijing - CHINA25
Push Pull Circuit and its Modes of Operation
CEU Paper, M. Zahran, WSEAS PE' 07, Beijing - CHINA26
Latest Version of the scaled up CEU to 11 Cells
L5
{Lload}
1 2
T itle
Size Docum ent Num ber Rev
Date: Sheet of
MS2 NRS CLU 002 11 <RevCode>
CLU Proj ect 2nd Stag e - NARSS-ERI Team Work
A3
1 1Friday, June 08, 2007
G-PUSH1 G-PULL1G-PUS H2 G-PULL2
TP 7 1
TP 8 1
VP-FB
TP 9 1
TP 10 1
D2MBR12035CT
TP 11 1
TP 12 1
T IR512
C6
{Cout}
IP-FB
R18
1
GND
TP 13 1
D1
MB R12035CTC2
{Cload}
TP 14 1
GND
TP 15 1
GND
TP 16 1
D3
MB R12035CT
TP 17 1
C5{Cload}
L3
{Lload}
1 2
TP 18 1
L1
{Lload}
1 2
CELL3
1.2V
HOLE1
CONN JACK
1
D4
MB R12035CT
HOLE2
CONN JACK
1
TP 19 1
C7{Cload}
HOLE3
CONN JACK
1
T IR112
TP 20 1HOLE4
CONN JACK
1
TP 21 1
L4
{Lload}
1 2
T IR212
L2
{Lout}
1 2
T IR312
R121k
21
R141k
R6
0
Power Circuit
M2IRF540
R22.5k
R13.5k
R15.5k
GND
R20
0.5k
R40
100K
13
2
R19
0.5k
Q1MOSFET N DGS
GND
GND
GNDGND
GND
Q2MOSFET N DGS
Q3
MOSFET N DGSQ4
MOSFET N DGS
PUSH2
PULL2
C9
{CT} R21 {RT}
R17
.5k
R16
.5k
24-34 V
24-34 V
2nd STAGE DC-DC CONVERTERINPUT: 20 +/- 0.5 VOUTPUT:1.2 +/- 0.05 V
Control Circuit
R26
{Rg }
R24{RD}
R28
3k
G-PUSH1
PUSH1
24-34 V
R34
{Rg }
R32{RD}
R36
3k
R38{RS}
PULL1
24-34 V
G-PULL1
Driver Circuits1st STAGE MOSFET DRIVERS
Part Reference = R30{RS}
U2
TL494
VCC12
IN1+1
IN1-2
IN2+16
IN2-15
C18
C211
COMP3
DTC4
OC13
E19
E210
CT5
VREF14 RT
6
JP4
3 21 4
JP5
1 23 4
GND
U1
TL494
VCC12
IN1+1
IN1-2
IN2+16
IN2-15
C18
C211
COMP3
DTC4
OC13
E19
E210
CT5
VREF14 RT
6
C4
{CT}
R11
{RT ]
R75k
R85k
R31M
24-34 V
JP1
1 23 4
R233k
C310n
R1
240
Ip-FBC1
.1uVp-FB
1st STAGE DC-DC CONVERTERINPUT: 21-34 VOUTPUT:20 +/- 0.5V
GND
GND
R9
0.5k
R10
0.5k
PUSH1
PULL1
R5
.5k
24-34 V
R4
.5k
JP3
1 23 4
R27
{Rg }
R25{RD}
R29
3k
R31{RS}
PUSH2
24-34 V
G-PUSH2
R35
{Rg }
R33{RD}
R37
3k
R39{RS}
24-34 V
PULL2
2nd STAGE MOSFET DRIVERS
G-PULL2
L9
{Lload}
1 2
T IR912
D6
MB R12035CTC10
{Cload}
D7
MB R12035CTC11{Cload}
L7
{Lload}
1 2
L6
{Lload}
1 2
CELL7
1.2V
D8
MB R12035CTC12{Cload}
L8
{Lload}
1 2
T IR612
T IR712
T IR812
CELL5
1.2V
CELL6
1.2V
CELL8
1.2V
D9
MB R12035CTC13{Cload}
L12
{Lload}
1 2
T IR1212
D10
MB R12035CTC14{Cload}
L10
{Lload}
1 2
CELL10
1.2V
D11
MB R12035CTC15{Cload}
L11
{Lload}
1 2T IR101
2
T IR1112
CELL9
1.2V
CELL11
1.2V
D12
MB R12035CTC16{Cload}
JP2
3 21 4
JP6
3 21 4
TR2
Transformar
1212
77
11
22
1616
1515
88
1111
33
44
1313
99
1010
55
1414
66
T IR412
JP7
3 21 4
JP9
3 21 4
JP8
3 21 4
TP 1 1
TP 2 1
GND
M1IRF540
TP 3 1M3
IRF540
M4
IRF540
TP 4 1
Ls1
Ls2Lp2
Lp1
T R1
TP 5 1
CELL1
1.2V
CELL2
1.2V
TP 6 1
CELL4
1.2V
D5
MB R12035CTC8{Cload}
24-34 V
GND
CEU Paper, M. Zahran, WSEAS PE' 07, Beijing - CHINA27
Real Images of the implemented CEU Circuit
Overview of the implemented circuit
Side-view of the implemented circuit
CEU Paper, M. Zahran, WSEAS PE' 07, Beijing - CHINA28
Real Images of the implemented CEU Testing with shallow loading
CLU Board and measurements instruments
Partially Loading of the CLU Circuit
CEU Paper, M. Zahran, WSEAS PE' 07, Beijing - CHINA29
Control Signals
CEU Paper, M. Zahran, WSEAS PE' 07, Beijing - CHINA30
Measured Values
Voltage and Primary Current of the CEU while shorting one of the CEU channels.
Value of the Short Circuit Current in one CEU Channel.
CEU Paper, M. Zahran, WSEAS PE' 07, Beijing - CHINA31
Thanks
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