Passive CMS equalization circuit and method based on super capacitor

Abstract

The invention discloses a passive CMS equalization circuit and method based on a super capacitor. The passive CMS equalization circuit comprises a super capacitor bank, a self-powered module, a sampling module, an equalization control module, a main control module and an equalization module, wherein the super capacitor bank in a power-off state is used as a power supply for being converted into anequalization circuit through the self-powered module, the real-time voltage of each capacitor monomer is collected and is controlled by the equalization control module and the main control module, and the equalization module maintains the potential balance among the super capacitor monomers in a resistance consumption mode. According to the invention, when the external power supply of the super capacitor bank is stopped, the electric energy stored in the super capacitor bank is used as the power supply of the equalization circuit, so that after the super capacitor bank is powered on again, extra time is not needed to wait for each capacitor monomer to realize voltage equalization work, and the operation efficiency of a machine working depending on the super capacitor bank is greatly improved.

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 double-layer supercapacitor is only about 2.5V / 2.7V. Therefore, ...

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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, the control power (DC12V, DC24V, AC220V) is all 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, which requires 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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