Cascaded battery protection circuit and system
A protection circuit, discharge protection technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of large current, consumption, etc., and achieve the effect of reducing power consumption
Active Publication Date: 2014-06-11
WUXI ZGMICRO ELECTRONICS CO LTD
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Problems solved by technology
These cell protection units that have not entered the low power consumption mode will still consume a large amount of current
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[0020] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0021] Reference herein to "one embodiment" or "an embodiment" refers to a particular feature, structure or characteristic that can be included in at least one implementation of the present invention. "In one embodiment" appearing in different places in this specification does not all refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments. Unless otherwise specified, the words connected, connected, and joined in this document mean that they are electrically connected directly or indirectly. In this article, n is a natural number greater than or equal to 2, and multiple means two or more. Words such as connection, connection, and series in this article can be under...
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The invention provides a cascaded battery protection circuit and a cascaded battery protection system. The cascaded battery protection circuit comprises a plurality of electric core protection units, wherein each electric core protection unit comprises a discharge protection output end, a discharge protection input end, a current detection end and a negative voltage detection end; each of the electric core protection units except for the electric core protection unit of the bottommost stage receives a discharge overvoltage protection signal output by the negative voltage detection end of the electric core protection unit of the next stage; each of the electric core protection units except for the electric core protection unit of the uppermost state enters a discharge overvoltage protection state when the discharge overvoltage signal which is generated or received by the electric core protection unit is abnormal, generates and outputs a discharge overvoltage protection signal to the current detection end of the electric core protection unit of the uppermost stage through the negative voltage detection end of the previous electric core protection unit, and then enters a low-power-consumption mode. Compared with the prior art, the cascaded battery protection circuit realizes uploading of the discharge overvoltage protection signal on the basis that a pin is not added, so that all the electric core protection units can enter the low-power-consumption mode.
Description
【Technical field】 [0001] The invention relates to a power management circuit, in particular to a cascaded battery protection circuit and system. 【Background technique】 [0002] Due to the advantages of high energy, high battery voltage, wide working range and long storage life, lithium-ion batteries have been widely used in military and civilian small electrical appliances, such as mobile phones, portable computers, video cameras, cameras, etc., partially replacing traditional batteries. Battery. However, due to its physical characteristics, lithium batteries have very strict requirements on charging current, discharging current, voltage and temperature during use. Once exceeded, it will have serious consequences in terms of safety and life. Therefore, during the charging and discharging process of lithium-ion batteries, key parameters such as overcharge voltage, overdischarge voltage, charge limit current, and discharge limit current need to be monitored and controlled to ...
Claims
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IPC IPC(8): H02H7/18
Inventor 张勇王钊尹航张汉儒
Owner WUXI ZGMICRO ELECTRONICS CO LTD