Electric voltage equalization circuit for connecting in series super battery of capacitors

Abstract

The invention provides a voltage equilibrium circuit which used for connecting a super capacitor group in series, consisting of an operational amplifier, a switch pipe and resistances. Two resistances with the same resistance values form a bleeder circuit being in jumper connection with two adjacent super capacitors; the midpoint output of the bleeder circuit is taken as a reference voltage to the operational amplifier; the midpoint voltage of the two adjacent super capacitors is taken as the input voltage of the operational amplifier. When the different voltage value of the two adjacent super capacitors exceeds the arranged range, the voltage equilibrium circuit works and discharges by connecting the one with higher voltage out of the two adjacent super capacitors with a power resistance, till the different voltage value of the two adjacent super capacitors is in the arranged range, at this moment, the voltage equilibrium circuit stops working under the control of an internal enabling circuit and enters a standby mode. The voltage equilibrium circuit has the advantages of simple structure, easy installation, low energy consumption, low cost and effectively solving the imbalance voltage problem when a plurality of super capacitors are connected in series.

Description

technical field [0001] The invention relates to a voltage equalization circuit, in particular to a circuit capable of equalizing the voltage between individual cells of a supercapacitor bank connected in series. Background technique [0002] The rated operating voltage of a single supercapacitor is very low. In order to make it more widely used in the field of energy storage, a typical method is to connect multiple supercapacitors in series to obtain a larger capacity. Due to the dispersion of the characteristic parameters between each supercapacitor, the voltage between the monomers of the supercapacitor bank will be unbalanced under normal charge and discharge or standby state, and the phenomenon of overcharging and overdischarging will cause permanent damage to the supercapacitor. And then cause the failure of the whole energy storage system. The traditional charging and discharging detection circuit monitors the voltage of a single supercapacitor, and if it reaches the ...

AI Technical Summary

Problems solved by technology

The main disadvantage of this kind of comparator voltage equalization circuit is that since the voltages between the supercapacitors that need to be balanced cannot be completely statically equal, the operational amplifier without the enable function will still be in an approximately balanced state even if the supercapacitors that need to be balanced are in an approximately balanced state. Continue to run in the working mode, in addition to the energy consumed by itself, the closed resistance branch continues to discharge, further consuming energy

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