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# Electric Double-Layer Capacitor(EDLC) of Simple Model using LTspice

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Electric Double-Layer Capacitor(EDLC) of Simple Model using LTspice

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### Electric Double-Layer Capacitor(EDLC) of Simple Model using LTspice

1. 1. Electric Double-Layer Capacitor (EDLC) Simplified SPICE Behavioral Model All Rights Reserved Copyright (C) Bee Technologies 2015 1 LTspice Version Bee Technologies
2. 2. Contents 1. Benefit of the Model 2. Model Feature 3. Concept of the Model 4. Parameter Settings 5. Electric Double-Layer Capacitor (EDLC) Specification (Example) 5.1 Charge Time Characteristic 5.2 Discharge Time Characteristic Simulation Index All Rights Reserved Copyright (C) Bee Technologies 2015 2
3. 3. 1. Benefit of the Model • The model enables circuit designer to predict and optimize Electric Double-Layer Capacitor (EDLC) runtime and circuit performance. • The model can be easily adjusted to your own EDLC specifications by editing a few parameters that are provided in the datasheet. • The model is optimized to reduce the convergence error and the simulation time All Rights Reserved Copyright (C) Bee Technologies 2015 3
4. 4. • This EDLC Simplified SPICE Behavioral Model is for users who require the model of a EDLC as a part of their system. • Capacitor Voltage(Vcap) vs. Time (s) Characteristic, that can perform EDLC charge and discharge time at various current rate conditions, are accounted by the model. 2. Model Feature All Rights Reserved Copyright (C) Bee Technologies 2015 4 Equivalent circuit of Electric Double-Layer Capacitor (EDLC) model
5. 5. 3. Concept of the Model All Rights Reserved Copyright (C) Bee Technologies 2015 5 EDLC Simplified SPICE Behavioral Model [Spec: VRATE,VINT,CAP,ESR,TSCALE] + - • The model is characterized by parameters: VRATE which represent the Rated Voltage, CAP which represent the capacitor capacity and VINT which represent the capacitor initial capacity level. • Open-circuit voltage (VOC) vs. Time (s) is included in the model as an analog behavioral model (ABM). Output Characteristics
6. 6. 4. Parameter Settings VRATE is the Rated Voltage [V] – e.g. VRATE = 1, 4.2, or 5.5 [V] VINT is the Initial Condition – e.g. VINT =0 for a empty capacitor (0%), VINT=4.2 (equal VRATE) for a full charged capacitor (100%) CAP is the capacitance [F] – e.g. CAP = 0.1, 0.47, or 10 [F] ESR is the equivalent Series Resistance of capacitors – e.g. ESR = 0.1, 0.5, or 1 [Ω] TSCALE turns TSCALE seconds into a second – e.g. TSCALE=60 turns 60s or 1min into a second, TSCALE=3600 turns 3600s or 1h into a second • From the EDLC specification, the model is characterized by setting parameters VRATE, VINT, CAP, ESR and TSCALE. All Rights Reserved Copyright (C) Bee Technologies 2015 6 Model Parameters: (Default values)
7. 7. 5. Li-Ion Capacitor Specification (Example) All Rights Reserved Copyright (C) Bee Technologies 2015 7 Rated voltage, VINT, capacitance and ESR are input as a model parameter Rated voltage, VINT, capacitance and ESR are input as a model parameter Rated Voltage 4.2V Capacitance 0.47F ESR 0.13Ω
8. 8. 5.1 Charge Time Characteristic All Rights Reserved Copyright (C) Bee Technologies 2015 8 (second) Measurement Simulation • Rated Voltage: 4.2V • Initial Condition: 0V • Charging Current: 1A 25°C 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 0 0.5 1 1.5 2 2.5 CapacitorVoltage(V) Time(s) Charge Time Chracteristic V
9. 9. 5.1 Charge Time Characteristic − Simulation Circuit and Setting All Rights Reserved Copyright (C) Bee Technologies 2015 9 Charging CurrentCharging Current
10. 10. All Rights Reserved Copyright (C) Bee Technologies 2015 10 Measurement Simulation • Rated Voltage: 4.2V • Initial Condition: 4.2V • Discharging Current: 1A 5.2 Discharge Time Characteristic (second) 25°C
11. 11. 5.2 Discharge Time Characteristic − Simulation Circuit and Setting All Rights Reserved Copyright (C) Bee Technologies 2015 11 Discharging CurrentDischarging Current
12. 12. Simulation Index All Rights Reserved Copyright (C) Bee Technologies 2015 12 Simulations Folder name 1. Charge Time Characteristic................................. 2. Discharge Time Characteristic............................. Charge_Time Discharge_Time