Battery charger using ltspice

1. *Analysis directives:
• .tran 0 15ms 0 startup
• method = modified trap
• solver = Normal
Case1: Battery Charger Circuit with VBAT
 Simulation Circuit and Setting
1
Battery

2. Case1: Simulation Result
2
• Total elapsed time: 1118.313sec. ≈ 19min.
Charging Voltage
Charging Current

3. *Analysis directives:
• .tran 0 30ms 0 startup
• method = Trapezoidal
• solver = Alternate
• .options RELTOL=0.1
• .options VNTOL=1m
• .options ABSTOL=100n
• .options CHGTOL=1E-8
• .options GMIN=1E-9
• .options ITL1=500
• .options ITL2=200
• .options ITL4=100
Case2: Battery Charger Circuit with Li-ion model
 Simulation Circuit and Setting
3
Lithium Ion Battery
• 3.7V – Nominal Voltage
• 2200mAh – Nominal Capacity
• 4-Cells
• Use Timescale=360K, Simulation time: 10ms=1hour.

4. Case2: Simulation Result
4
• Total elapsed time: 3025.546sec. ≈ 50min.
Capacity=0-100%
(10ms/hour)
Charging Time ≈ 2Hrs.
Charging Voltage
Charging Current