Electric Double-Layer Capacitor(EDLC) of Simple Model using LTspice
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Transcript of Electric Double-Layer Capacitor(EDLC) of Simple Model using LTspice
Electric Double-Layer Capacitor (EDLC)Simplified SPICE Behavioral Model
All Rights Reserved Copyright (C) Bee Technologies 2015 1
LTspice Version
Bee Technologies
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
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
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• 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
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Equivalent circuit of Electric Double-Layer Capacitor (EDLC) model
3. Concept of the Model
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EDLCSimplified SPICE Behavioral Model
[Spec: VRATE,VINT,CAP,ESR,TSCALE]
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• 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
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 []
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.
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Model Parameters:
(Default values)
5. Li-Ion Capacitor Specification (Example)
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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 0.13
5.1 Charge Time Characteristic
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(second)
Measurement Simulation
• Rated Voltage: 4.2V• Initial Condition: 0V• Charging Current: 1A
25C
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
0 0.5 1 1.5 2 2.5
Capa
cito
r V
olta
ge(V
)
Time(s)
Charge Time Chracteristic
V
5.1 Charge Time Characteristic Simulation Circuit and Setting
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Charging CurrentCharging Current
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Measurement Simulation
• Rated Voltage: 4.2V• Initial Condition: 4.2V• Discharging Current: 1A
5.2 Discharge Time Characteristic
(second)
25C
5.2 Discharge Time Characteristic Simulation Circuit and Setting
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Discharging CurrentDischarging Current
Simulation Index
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Simulations Folder name
1. Charge Time Characteristic.................................
2. Discharge Time Characteristic.............................
Charge_Time
Discharge_Time