A passive cms equalization circuit and method based on a supercapacitor

Abstract

The invention discloses a supercapacitor-based passive CMS equalization circuit and method, comprising a supercapacitor group, a self-power supply module, a sampling module, an equalization control module, a main control module and an equalization module. The supercapacitor bank in the power-off state is converted into the power supply of the balance circuit through the self-power supply module, and the real-time voltage of each capacitor monomer is collected, controlled by the balance control module and the main control module, and maintained by the balance module in the form of resistance consumption Potential balance between individual supercapacitor cells. The present invention adopts that when the external power supply of the supercapacitor group stops, the electric energy stored in the supercapacitor group itself is used as the power supply of the equalization circuit, so that after the supercapacitor group is powered on again, it does not need to spend extra time waiting for each capacitor unit to realize the voltage equalization work , greatly improving the operating efficiency of machines that rely on supercapacitors.

Description

technical field [0001] The invention relates to the field of supercapacitors, in particular to a passive CMS equalization circuit and method based on supercapacitors. Background technique [0002] Supercapacitors are famous for their high power density, long charge-discharge cycle life, appropriate energy density, high reliability, wide operating temperature range, and low environmental requirements. Compared with other existing energy storage technologies, supercapacitor energy storage technology has the obvious advantages of no pollution and high efficiency, which is in line with the current mainstream trend of green energy development. It is mainly used in consumer electronics, smart watches, smart grids, electric vehicles, petroleum Military-related fields such as machinery, UPS and aerospace. [0003] The rated voltage of a single supercapacitor is very low, and the rated voltage of an organic electrolyte electric double layer supercapacitor is only about 2.5V / 2.7V. Th...

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Problems solved by technology

[0004] At present, in most application scenarios, the supercapacitor system uses an external power supply. After the supercapacitor system is used, all the control power (DC12V, DC24V, AC220V) is completely disconnected, resulting in the inability of the equalization circuit to work, and it takes a certain time to power on again ( It depends on the stop working time) to perform equalization to work normally, and it needs to consume certain resources; at the same time, it is necessary to consider the power supply line of the equalization board, communication line layout, fixation, EMC, communication interference and other issues

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