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

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 All Rights Reserved Copyright (C) Bee Technologies Corporation 2012

All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 Case1: Voltage Source(v1) with LTC3105  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

Case1: Voltage Source(v1) with LTC3105  Simulation Result Input Voltage VMPPC=0.4V Input Current Output Voltage Total elapsed time: 410.938sec. ≈ 7min. All Rights Reserved Copyright (C) Bee Technologies Corporation 2012

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

Case2: MPPC Response to Input Source (SOL=100%)  Simulation Result Input Voltage VMPPC=0.5V Input Current Output Voltage Total elapsed time: 786.766sec. ≈ 13min. All Rights Reserved Copyright (C) Bee Technologies Corporation 2012

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

Case3: MPPC Response to Input Source (SOL=50%)  Simulation Result Input Voltage VMPPC=0.5V Input Current Output Voltage Total elapsed time: 387.219sec. ≈ 7min. All Rights Reserved Copyright (C) Bee Technologies Corporation 2012

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 All Rights Reserved Copyright (C) Bee Technologies Corporation 2012

Case4: Maximum power point tracking (SOL=30%)  Simulation Result Input Voltage Input Voltage Output Voltage VMPPC =0.500V --- VMPPC =0.475V --- Total elapsed time: 2082.5sec. ≈ 35min. All Rights Reserved Copyright (C) Bee Technologies Corporation 2012

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

Output Characteristics vs. Incident Solar Radiation (Ref.2) Current (A) SOL=0.5 SOL=0.3 499.876mV,397.284mW Power (W) 485.393mV,182.125mW Parameter, SOL is added as normalized incident radiation, SOL=1 for 100% conditions 475.064mV,98.197mW Voltage (V) All Rights Reserved Copyright (C) Bee Technologies Corporation 2012

All Rights Reserved Copyright (C) Bee Technologies Corporation 2012 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