1. Voltage balancing with balance resistors/passive method The simple and most cost-effective way to balance the voltages across the supercapacitors is to connect resistors of equal value across each supercapacitor. As the resistor is connected permanently across supercapacitors, the power dissipation in the resistors will be continuous.
ars; Henry HuangWhy Balance?Leakage current for a supercapacitor cell is complex function of oltage, time and temperature. Supercapacitors with multiple cells in series require a balancing circuit to ensure all cells hav approximately equal voltage. This is because the leakage current of different supercapacitor cells will differ over
Voltage balancing using an op amp circuit. The balance circuit in Figure 3 will be active when the voltage across the supercapacitor is not balanced. Once the voltages across each supercapacitor are balanced, this circuit consumes less power. Hence, this circuit is a highly energy-efficient method.
alancing circuit is required. The balancing circuit will source or sink current from the midpoint between the 2 cells so the current lowing in each cell is equal. This application white paper will now consider some in Dual Cell SupercapacitorsWhen 2 cells in series are first charged, their voltage
capacitor has an initial state of charge Vi , which occurs after the capacitor is fully charged. Due to balancing, the capacitor reaches the actual state of charge Vc with respect to ground (V0 ), which can also be specified with respect to Vi: =Vc-Vi. Two ratios may now be considered:
rence in capacitance, resistance and leakage current. These differences create an imbalance i the cell voltages of supercapacitor wired in series. It is important to keep the voltage on any sing e cell below its maximum recommended working voltage. Otherwise the supercapacitor could degrade from electrolyte decomposition, gas gene