A supercapacitor charging protection device

Abstract

The invention belongs to the technical field of avionics, and in particular relates to a supercapacitor charging protection device, which includes a voltage equalization circuit 1 and an overvoltage detection circuit 2. The VIN1 of the voltage equalization circuit 1 is connected to the high end of the The middle end of the series capacitor bank is connected, and VSS is connected to the low end of the series capacitor bank. The overvoltage detection circuit 2 is composed of two overvoltage comparison circuits 21, and the inputs of the two overvoltage comparison circuits 21 are respectively connected in parallel to two On both sides of the supercapacitor, the outputs of the two overvoltage comparator circuits 21 are connected in parallel for output. The invention can effectively keep the voltages of the supercapacitors basically consistent during the charging process, and adopts a switching power supply mode to transfer energy between the supercapacitors, which can effectively improve energy utilization efficiency and reduce heat loss. When the voltage of the supercapacitor exceeds the set value, it can output a switch value, which can be used to close the charging circuit to avoid overcharging of the supercapacitor.

Description

technical field [0001] The invention belongs to the technical field of avionics, and in particular relates to a supercapacitor charging protection device. Background technique [0002] As a large-capacity energy storage component, supercapacitors have been widely used for energy storage in wind power generation and photovoltaic power generation industries. [0003] Since supercapacitor monomers generally have low operating voltages (2.5V, 2.7V, etc.), in practical applications, supercapacitor monomers will be connected in series or in parallel to expand the operating voltage and capacity. However, due to the difference in capacity between supercapacitor cells, when charging in series, the voltage of each supercapacitor cell will be inconsistent, which may eventually lead to overvoltage damage to individual supercapacitors. [0004] At present, the overvoltage protection of the supercapacitor generally adopts a shunt method or an energy transfer method. The former bypasses ...

AI Technical Summary

Problems solved by technology

The former bypasses the charging current of the supercapacitor to prevent the voltage of the supercapacitor from rising further and achieves the purpose of protection. However, the energy consumption of the bypass circuit is large. When charging with a large current, there is a problem of heat dissipation; the latter uses DC / DC, flying capacitor, etc. transfer the energy / charge on the supercapacitor with high voltage to the adjacent supercapacitor with lower voltage, which consumes less energy, but it is only used for voltage balance between capacitors, and cannot directly and effectively control supercapacitors. Capacitor voltage does not exceed the rated value

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