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リチウムイオンキャパシタのシンプルモデル(LTspice)

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リチウムイオンキャパシタのシンプルモデル(LTspice)

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リチウムイオンキャパシタのシンプルモデル(LTspice)

  1. 1. Copyright (C) Siam Bee Technologies 2015 1 Lithium Ion Capacitor Simplified SPICE Behavioral Model LTspice Version Bee Technologies
  2. 2. Contents 1. Benefit of the Model 2. Model Feature 3. Concept of the Model 4. Parameter Settings 5. Li-Ion Capacitor Specification (Example) 5.1 Charge Time Characteristic 5.2 Discharge Time Characteristic Simulation Index Copyright (C) Siam Bee Technologies 2015 2
  3. 3. 1. Benefit of the Model • The model enables circuit designer to predict and optimize Li-Ion Capacitor runtime and circuit performance. • The model can be easily adjusted to your own Li-Ion Capacitor 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 Copyright (C) Siam Bee Technologies 2015 3
  4. 4. • This Li-Ion Capacitor Simplified SPICE Behavioral Model is for users who require the model of a Li-Ion Capacitor as a part of their system. • Capacitor Voltage(Vcap) vs. Capacitor Capacity Level (SOC) Characteristic, that can perform capacitor charge and discharge time at various current rate conditions, are accounted by the model. 2. Model Feature Copyright (C) Siam Bee Technologies 2015 4 Equivalent circuit of Li-Ion Capacitor model Capacity Rself-Discharge S O C + - G 1 G V A L U E - + + - E 2 E 0 R D C E S RC A C P L U S M I N U S d s c h I N + I N - O U T + O U T - E 9 E V A L U E 1 0 5 + - G 3 G V A L U E
  5. 5. 3. Concept of the Model Copyright (C) Siam Bee Technologies 2015 5 Li-Ion capacitor Simplified SPICE Behavioral Model [Spec: CAP, ESR, RDC, NS] Adjustable SOC [ 0-100 (%) ] + - • The model is characterized by parameters: CAP, which represent the capacitor capacity and SOC, which represent the capacitor initial capacity level. • Open-circuit voltage (VOC) vs. SOC is included in the model as an analog behavioral model (ABM). • NS (Number of Cells in series) is used when the Li-ion capacitor cells are in series to increase voltage level. Output Characteristics
  6. 6. 4. Parameter Settings CAP is the amp-hour capacity [F] – e.g. C = 1, 10, or 1000 [F] ESR is the equivalent series resistance of capacitors – e.g. C = 0.1mΩ, 1mΩ, or 10mΩ [Ω] RDC is the DC resistance of capacitors – e.g. C = 0.1mΩ, 1mΩ, or 10mΩ [Ω] NS is the number of cells in series – e.g. NS=1 for 1 cell capacitor, NS=2 for 2 cells capacitor (capacitor voltage is double from 1 cell) SOC is the initial state of charge in percent – e.g. SOC=0 for a empty capacitor (0%), SOC=1 for a full charged capacitor (100%) 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 Li-Ion Capacitor specification, the model is characterized by setting parameters CAP, ESR, RDC, NS, SOC and TSCALE. Copyright (C) Siam Bee Technologies 2015 6 Model Parameters: (Default values)
  7. 7. 5. Li-Ion Capacitor Specification (Example) Copyright (C) Siam Bee Technologies 2015 7 Capacitance capacity, ESR and DCR are input as a model parameter Capacitance capacity, ESR and DCR are input as a model parameter Rated Voltage 3.8V Minimal Operating Voltage (Cutoff Voltage) 2.2V Capacitance/Capacity 1000F ESR 0.8mΩ DCR 1.2mΩ
  8. 8. 5.1 Charge Time Characteristic Copyright (C) Siam Bee Technologies 2015 8 • Rated Voltage: 3.8V • Cutoff Voltage: 2.2V • Charging Current: 5A Capacity=100% (second) Measurement Simulation SOC=0 means capacitor start from 0% of capacity (empty) SOC=0 means capacitor start from 0% of capacity (empty)
  9. 9. 5.1 Charge Time Characteristic − Simulation Circuit and Setting Copyright (C) Siam Bee Technologies 2015 9 TSCALE turn 1 is equaled 1 second into a second TSCALE turn 1 is equaled 1 second into a second Charging CurrentCharging Current
  10. 10. Copyright (C) Siam Bee Technologies 2015 10 Measurement Simulation (second) • Rated Voltage: 3.8V • Cutoff Voltage: 2.2V • Discharge Current: 5A SOC=0 means capacitor start from 100% of capacity (Full) SOC=0 means capacitor start from 100% of capacity (Full) 5.2 Discharge Time Characteristic
  11. 11. 5.2 Discharge Time Characteristic − Simulation Circuit and Setting Copyright (C) Siam Bee Technologies 2015 11 Discharging CurrentDischarging Current
  12. 12. Copyright (C) Siam Bee Technologies 2015 12 [Active Profile Index] Simulations Folder name 1. Charge Time Characteristic................................. 2. Discharge Time Characteristic............................. Charge_Time Discharge_Time

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