1. All Rights Reserved Copyright (C) Bee Technologies Corporation 2012
Circuit Simulation of LTC3105+Solar Cell(SPICE Model)
Using LTspice
400mA Step-Up DC/DC
Converter with Maximum Power
Point Control and 250mV Start-Up
Bee Technologies provide Spice Model of Solar Cell
17JAN2012
Bee Technologies Inc.
All Rights Reserved Copyright (C) Bee Technologies Corporation 2012

2. All Rights Reserved Copyright (C) Bee Technologies Corporation 2012
Content
Case1: Voltage Source(v1) with LTC3105
Case2: MPPC Response to Input Source (SOL=100%)
Case3: MPPC Response to Input Source (SOL=50%)
Case4: Maximum power point tracking (SOL=30%)
Solar Cell Specification (Ref.1)
Output Characteristics vs. Incident Solar Radiation (Ref.2)
Simulation Folder Index
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3. All Rights Reserved Copyright (C) Bee Technologies Corporation 2012
Case1: Voltage Source(v1) with LTC  Simulation Circuit and Setting
Input Voltage= 0.5V
*Analysis directives:
.tran 0 5m 0 startup
Vmppc= 0.4V
Output Voltage≈ 4.1V
RLOAD= 500Ω
All Rights Reserved Copyright (C) Bee Technologies Corporation 2012

4. Case1: Voltage Source(v1) with LTC3105  Simulation Result
Input Voltage
VMPPC=0.4V
Input Current
Output Voltage
Total elapsed time: sec. ≈ 7min.
All Rights Reserved Copyright (C) Bee Technologies Corporation 2012

5. All Rights Reserved Copyright (C) Bee Technologies Corporation 2012
Case2: MPPC Response to Input Source (SOL=100%)  Simulation Circuit and Setting
Pmax= 400mW
Voc= 0.58V
Isc= 0.872A
*Analysis directives:
.tran 0 5m 0 startup
.lib 19_12_93.lib
[SOL=100%]
Vmppc= Vmp= 0.5V
Output Voltage≈ 4.1V
IOUT≈ 8.2mA
All Rights Reserved Copyright (C) Bee Technologies Corporation 2012

6. Case2: MPPC Response to Input Source (SOL=100%)  Simulation Result
Input Voltage
VMPPC=0.5V
Input Current
Output Voltage
Total elapsed time: sec. ≈ 13min.
All Rights Reserved Copyright (C) Bee Technologies Corporation 2012

7. All Rights Reserved Copyright (C) Bee Technologies Corporation 2012
Case3: MPPC Response to Input Source (SOL=50%)  Simulation Circuit and Setting
Pmax= 400mW
Voc= 0.58V
Isc= 0.872A
*Analysis directives:
.tran 0 5m 0 startup
.lib 19_12_93.lib
[SOL=50%]
Vmppc= Vmp= 0.5V
Output Voltage≈ 4.1V
IOUT≈ 8.2mA
All Rights Reserved Copyright (C) Bee Technologies Corporation 2012

8. Case3: MPPC Response to Input Source (SOL=50%)  Simulation Result
Input Voltage
VMPPC=0.5V
Input Current
Output Voltage
Total elapsed time: sec. ≈ 7min.
All Rights Reserved Copyright (C) Bee Technologies Corporation 2012

9. All Rights Reserved Copyright (C) Bee Technologies Corporation 2012
Case4: Maximum power point tracking (SOL=30%)  Simulation Circuit and Setting
Pmax= 400mW
Voc= 0.58V
Isc= 0.872A
*Analysis directives:
.tran 0 10m 0 startup
.lib 19_12_93.lib
[SOL=30%]
Output Voltage≈ 4.1V
IOUT≈ 8.2mA
Vmppc= 0.5V, 0.475V
(Ref.2)
Parametric Sweep Rmppc: 50kΩ(0.5V), 47.5kΩ(0.475V)
Rmppc= Vm/10uA
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10. Case4: Maximum power point tracking (SOL=30%)  Simulation Result
Input Voltage
Input Voltage
Output Voltage
VMPPC =0.500V ---
VMPPC =0.475V ---
Total elapsed time: sec. ≈ 35min.
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11. Solar Cell Specification (Ref.1)
66mm
96mm
PARAMETER
VALUE
Pmax (W)
0.400
Vmp (V)
0.500
Imp (A)
0.800
Isc (A)
0.872
Voc (V)
0.580
The information refer to a part number 19_12_93 of CONRAD ELECTRONIC.
All Rights Reserved Copyright (C) Bee Technologies Corporation 2012

12. Output Characteristics vs. Incident Solar Radiation (Ref.2)
Current (A)
SOL=0.5
SOL=0.3
mV, mW
Power (W)
mV, mW
Parameter, SOL is added as normalized incident radiation, SOL=1 for 100% conditions
mV,98.197mW
Voltage (V)
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Simulation Index
Simulations
Folder name
Case1: Voltage Source(v1) with LTC3105.………………
Case2: Case2: MPPC Response to Input Source (SOL=100%)…
Case3: MPPC Response to Input Source (SOL=50%)……………
Case4: Maximum power point tracking (SOL=30%)
Output Characteristics vs. Incident Solar Radiation (Ref.2)………
v1_src
sg_cell_pv_src_100%
sg_cell_pv_src_50%
sg_cell_pv_src_vmpp
SOL
All Rights Reserved Copyright (C) Bee Technologies Corporation 2012