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An active equalization circuit and method

An active equalization and circuit technology, applied in the direction of charge equalization circuit, circuit device, battery circuit device, etc., can solve the problems of increased circuit cost, high cost of charging chip, and reduced equalization efficiency of active equalization circuit, so as to improve system efficiency and reduce System Cost Effects

Active Publication Date: 2021-09-17
SHANDONG LUNENG SOFTWARE TECH
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Problems solved by technology

[0003] The active balancing function of the battery can be completed by using the above-mentioned existing solution, but due to the combination of the voltage isolation conversion circuit and the charging chip, the cost of the charging chip is high, and in actual operation, the voltage isolation conversion circuit and the charging chip use a level connected mode, resulting in lower equalization efficiency of the active equalization circuit and increased circuit cost

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  • An active equalization circuit and method
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Embodiment Construction

[0028] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0029] It should be noted that the terminology used herein is for the purpose of describing specific embodiments only, and is not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural as well, furthermore, it is to be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates that There are features, steps, operations, devices, components and / or combinations thereof.

[0030] In one or more embodiments, an active equalization circuit is disclosed, comprising: a con...

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Abstract

The invention discloses an active equalization circuit and method, comprising: a control circuit, which controls the power conversion circuit connected to it by controlling the turn-on and turn-off of the triode according to the difference between the voltage of a certain single battery and the voltage of other batteries The power conversion circuit collects the voltage value of the battery voltage. When the battery voltage is lower than the set value, the power conversion circuit is controlled to charge the battery in the constant current source mode by adjusting the duty cycle of the PWM signal; when the battery voltage is greater than the set value When the value is fixed, by adjusting the duty cycle of the PWM signal, the power conversion circuit is controlled to charge the battery in a constant voltage source mode. The beneficial effect of the invention is that the control strategy for switching between the voltage source and the current source is adopted to ensure safe and reliable operation of the power conversion circuit. The charging control circuit and power conversion circuit are effectively combined to replace the widely used charging chip and isolation conversion scheme, improve system efficiency and reduce system cost.

Description

technical field [0001] The invention relates to the fields of new energy electric vehicles and microgrid energy storage systems, in particular to a lithium battery management system, and aims to provide a low-cost and high-efficiency active balancing circuit and method. Background technique [0002] In order to make up for the difference in voltage and capacity caused by the aging of some batteries, passive equalization or active equalization can be used to solve the difference problem. Passive balancing technology connects discharge resistors in parallel at both ends of each single cell. During charging, when the voltage difference between the single cells exceeds a certain threshold, the discharge switch is activated, and the excess battery energy is dissipated in the form of heat. At present, the mainstream active equalization circuit in the market mostly adopts the combination of voltage isolation conversion and charging chip. The voltage isolation conversion circuit rea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00B60L58/22
CPCH02J7/0014Y02T10/70
Inventor 李豹刘广扩杨勇卢剑锋胡勇何军田王培仑孙宁波高先进
Owner SHANDONG LUNENG SOFTWARE TECH
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