Control circuit for equalizing charging by utilizing solar cell panel

Abstract

The invention discloses a control circuit for equalizing charging by utilizing a solar cell panel. The control circuit comprises a solar cell panel interface, a filtering unit, a front voltage detection unit, a main step-down unit, a feedback unit, a current detection unit, an equalizing charging unit, a battery pack interface and an MCU. The solar cell panel interface, the filtering unit, the main step-down unit, the current detection unit, the equalizing charging unit and the battery pack interface are electrically connected in sequence. The front voltage detection unit is electrically connected with the input end of the main step-down unit. The feedback unit is electrically connected with the output end of the main step-down unit. The front voltage detection unit, the main step-down unit, the feedback unit, the current detection unit and the equalizing charging unit are all electrically connected with the MCU. The problem of unbalanced charging of the power battery pack can be solved, the charging voltage can be greatly regulated and the problem that the solar cell panel charges the power battery can be solved and thus the control circuit has good market application value.

Description

technical field [0001] The invention relates to the field of charging circuits, in particular to a control circuit for balanced charging using solar panels. Background technique [0002] At present, the charging of lithium battery packs generally adopts series charging, which is mainly because the series charging method has a simple structure, low cost, and is relatively easy to implement. However, due to the differences in capacity, internal resistance, attenuation characteristics, self-discharge and other performance between single lithium batteries, when charging lithium battery packs in series, the single lithium battery with the smallest capacity in the battery pack will be fully charged first. At this time, other batteries are not fully charged. If you continue to charge in series, the fully charged single lithium battery may be overcharged. [0003] However, overcharging of a lithium battery will seriously damage the performance of the battery, and may even cause an ...

AI Technical Summary

Problems solved by technology

When charging in series, if the voltage of a single lithium battery reaches the overcharge protection voltage, the battery management system will cut off the entire series charging circuit and stop charging to prevent this single battery from being overcharged, which will cause other lithium batteries to overcharge. The battery cannot be fully charged, which makes it an urgent technical problem to solve the technical problem of power battery charging. At the same time, there is a lack of a complete control circuit for charging the battery pack through solar panels.

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