A voltage balance circuit for serial connected super capacitor

Abstract

The invention provides a voltage balancing circuit used for a series super capacitors bank, and the voltage balancing circuit consists of a control logic device and an electrolytic capacitor. The control logic includes a divider circuit, a pulse generating circuit and a switch array. The voltage balancing circuit is connected with a super capacitor to be balanced. When the voltage difference of two adjacent supper capacitors exceeds the set range, the voltage balancing circuit transfers the electric charge from a high-voltage supper capacitor to a low-voltage supper capacitor, until the voltage difference of the high-voltage supper capacitor to the low-voltage supper capacitor enters into the set range. At that moment, the voltage balancing circuit stops working under the control of an internal empowering circuit and enters into a standby mode, and reduces the energy dissipation. The voltage balancing circuit has simple structure and low cost, can be installed easily, can effectively solve the problem that the voltage of a plurality of series super capacitors is not even.

Description

technical field [0001] The invention relates to a voltage equalization circuit, in particular to a circuit capable of balancing the voltage between individual cells of a series supercapacitor bank. 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 different characteristic parameters of 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 overcharge and overdischarge will cause permanent damage to the supercapacitor, and then cause the failure of the entire energy storage system. The traditional charging and discharging detection circuit monitors the voltage of a single supercapacitor, and if it reaches the allowable maximum or minimum v...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcoming that the voltages between individual supercapacitors cannot be balanced in the supercapacitor bank with multiple units in series in the prior art, and to provide a voltage equalization circuit, which can maintain low cost and be easy to install. , so that the standby power consumption of the energy storage system composed of multi-cell supercapacitor banks in series is low, and the voltage equalization speed between individual supercapacitors is fast

Images