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. 2021 Jul 5;21(13):4599. doi: 10.3390/s21134599
CCCV constant-current, constant-voltage (charging scheme)
DAE differential algebraic equation
DC direct current (opposite of AC = alternating current)
EH energy harvesting
FOCV fractional open-circuit voltage (method)
MPP maximum power point
PMIC power management integrated circuit
PI proportional–integral (controller)
P&O perturb and observe (method)
WSN wireless sensor nodes