Circuit Simulation of LTC3105+Solar Cell(SPICE Model) Using LTspice

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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

19JAN2012Bee Technologies Inc.

http://www.beetech.info/

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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Case1: Voltage Source(v1) with LTC3105 − Simulation Circuit and Setting

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Output Voltage≈ 4.1VRLOAD= 500Ω

*Analysis directives:• .tran 0 5m 0 startup


Input Voltage= 0.5V

Vmppc= 0.4V

– Total elapsed time: 410.938sec. ≈ 7min.


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Case1: Voltage Source(v1) with LTC3105 − Simulation Result

Input Voltage

Output Voltage

VMPPC=0.4V

Input Current

Solar Cell Specification (Ref.1)

• The information refer to a part number 19_12_93 of CONRAD ELECTRONIC.


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PARAMETER VALUE

Pmax (W) 0.400

Vmp (V) 0.500

Imp (A) 0.800

Isc (A) 0.872

Voc (V) 0.580

66mm

96m

m

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Output Voltage≈ 4.1VIOUT≈ 8.2mA

*Analysis directives:• .tran 0 5m 0 startup• .lib 19_12_93.lib


Pmax= 400mWVoc= 0.58VIsc= 0.872A

Case2: MPPC Response to Input Source (SOL=100%) − Simulation Circuit and Setting

Vmppc= Vmp= 0.5V

[SOL=100%]



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Case2: MPPC Response to Input Source (SOL=100%) − Simulation Result

Input Voltage

Output Voltage

VMPPC=0.5V

Input Current

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Case3: MPPC Response to Input Source (SOL=50%) − Simulation Circuit and Setting

Vmppc= Vmp= 0.5V

[SOL=50%]



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Case3: MPPC Response to Input Source (SOL=50%) − Simulation Result

Input Voltage

Output Voltage

VMPPC=0.5V

Input Current

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Case4: Maximum power point tracking (SOL=30%) − Simulation Circuit and Setting

Vmppc= 0.5V, 0.475V(Ref.2)

[SOL=30%]

Parametric Sweep Rmppc: 50kΩ(0.5V), 47.5kΩ(0.475V) Rmppc= Vm/10uA



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Case4: Maximum power point tracking (SOL=30%) − Simulation Result

Input Voltage

VMPPC =0.500V ---VMPPC =0.475V ---

Output Voltage

Input Voltage

Output Characteristics vs. Incident Solar Radiation (Ref.2)

19_12_93 Output Characteristics vs. Incident Solar Radiation


Parameter, SOL is added as normalized incident radiation, SOL=1

for 100% conditions

Voltage (V)

Cur

rent

(A

)P

ower

(W

)

499.876mV,397.284mW

485.393mV,182.125mW

SOL=0.5

SOL=1

SOL=0.3

475.064mV,98.197mW

Simulation Index

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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


Technology

Circuit Simulation of LTC3105+Solar Cell(SPICE Model) Using LTspice